Vacuum tubes fall into three mainly non-interchangeable categories regarding their heater or filament voltage/current,[1] though some tubes' heaters run at both a standardized voltage and current, e.g., 6.3 V at 300 mA or 13 V at 200 mA, making them suitable for either series or parallel operation.
Battery types, ubiquitous before the 1930s but since then only for mobile/portable equipment; all filaments in a device are connected in parallel and rated the same voltage. Early sets had the heaters connected to the battery via a variable filament resistor (rheostat), later via an automatic ballast tube, to compensate for the decreasing battery voltage.Types for hand-held/portable devices are usually 1 to 2 V directly heated, to save heating power (therefore requiring a DC current), except if the (due to the voltage gradient along the filament) poorly defined cathode potential impedes the function of the tube, as is the case e.g. with AM detector diodes with filament voltages of 1.9 V or more; in such cases, indirect heaters were employed and marketed as equipotential or unipotential cathode at the time.Types for mobile devices (installed in land/marine/aerial vehicles) are indirectly heated from the 6-, 12-, or 24-volts engine crank battery resp. the alternator or APU; a high-output radio alternator option to meet the additional power demand, was offered for cars (not to be confused with the Alexanderson alternator).
6.3 V, indirectly heated, from four dry cells or from three lead-acid cells[5] (used in 6-volts vehicle equipment; examples)
5 V, directly heated, via a rheostat (used in home radios; examples)
12.6 V, indirectly heated, from six lead-acid cells (used in 12-volts vehicle equipment; examples)
26.5 V, indirectly heated, from twelve lead-acid cells (used in 24-volts vehicle equipment, also on the standard avionics 28-volts DC bus)
Types for AC-only equipment with a mains transformer; dull-emitter signal and low-power tubes are indirectly heated and all heaters in a device are rated the same voltage and fed in parallel from a transformer secondary winding.In North America, a 2.5VRMS standard was used 1929–34 (examples); elsewhere, nominal heater voltages from 1920's lead-acid/"battery eliminator" era (multiples of 2 or 2.1V) were kept, 4VRMS in the UK (examples),[1] but since the 1940s the 6.3-volts and 12.6-volts car radio standards prevailed everywhere; 5VRMS became a standard for full-wave rectifiers (examples) fed from a separate transformer winding because their filament/cathode is on anode supply potential.
However, early AF power tubes were directly AC-heated with the heater transformer center tap tied to signal ground. To cancel out mains hum more precisely, signal ground could instead be tied to the slider of a small, wirewound potentiometer across the floating AC heater supply (examples).
Most RF power tubes are bright-emitter directly heated, so for the abovementioned reason, the heater voltage must be much smaller than the signal voltage on the control grid and is therefore in the 1.1 to 25 V range, drawing up to hundreds of Amperes from a suitable heater transformer capable of slowly ramping up the heater voltage to smooth out the otherwise destructive heater inrush current, and to minimize thermal stress to the vacuum seals, when powering up.Some high-power RF tubes have a 2-phase (Eimac 8974, RCA 891 and Philips TAW12/10) or 3-phase (RCA 893, 898 and Philips TAW12/35G, TBW15/125) heater to reduce hum.Some microwave power tubes require heater voltage derating above a specified maximum operating frequency where electron transit time effects start causing back bombardment heating of the cathode.
Types for mass-produced radio and TV receivers designed to run on either AC or DC mains power (ac/dc) with no mains transformer; they are always indirectly heated and all heaters are connected in series across the mains power supply, possibly with an additional ballast resistor or barretter chosen such that the sum of the heater and ballast voltages equals the mains voltage; all tubes in a device need to:
be rated the same heater current, typically 50, 100, 150, 200, 300, 450 or 600 mA, depending on mains voltage and device tube count
have the same warm-uptime constant, typically 11 seconds, controlled by increasing the cathode's thermal capacity so it wouldn't overheat when powering up
have a heater/cathode insulation that withstands the high voltage at the top of a series heater string, which some tubes intended for parallel heater operation can't; if a heater further down the string breaks, they even have to withstand the full mains voltage
Some power tubes have a heater tap near one end to feed a small pilot lamp, thus shunting away from it the heater inrush current when powering up.[6]
The currents drawn by parallel-connected types, and the voltages across series-connected types, vary widely according to the tube's heating power requirements. Otherwise identical tubes were manufactured in several variants with different heater ratings, but usually the same heater power[10]
Some tubes feature a center-tapped filament/heater, providing:
Two voltage/current options by series resp. parallel wiring of their two heater sections, e.g. 2×6.3 V/150 mA (series) resp. 6.3 V/2×150 mA (parallel) (useful in dual-system (6-volts and 12-volts) car radios; examples), or
A defined cathode current return path and reference point for directly heated tubes where signal ground, and an internal shield and/or a suppressor grid if present, are connected to; this is the only allowed use for many directly heated high-power RF tubes since their center-tap can't carry the huge heater current, except with 2-phase heater tubes
In this list, Filament implies a directly heated tube; Heater implies an indirectly or half-indirectly heated tube - in half-indirectly heated tubes, the cathode sleeve and one side or the center-tap of the filament share the same pin.
Dual-control pentode: The suppressor grid has a short grid base (=fine pitch) like the control grid and is available on a separate base pin (instead of internally tied to the cathode) so it can be used as a second control grid; anode current flows only if neither grid is negative; derived from the dual-grid mixer triode and precursor of the Gated-beam discriminator and hexode/heptode/octode/nonode approaches
Strap frame-grid: While a normal grid is a thin wire wound to a helix around two swaged metal posts, a frame-grid is a thin wire wrapped around a rectangular stamped sheet metal frame; except in planar microwave tubes, one such frame on either side of the cathode is needed to form a grid
Shadow-grid: Beam pentode with a beam-forming extra grid between control and screen grids (technically a beam hexode), aligned to cast an electron shadow on the screen grid wire and thus reduce screen grid current and hence anode/screen grid distribution noise
The anodes of high-power tubes are usually made from Copper because of its high electrical and thermal conductivity.[11] Their maximum power dissipation can be exceeded for a short time, as long as the average is not exceeded over the anode's thermal time constant (typically 0.1 sec). In Class-C applications, the amplifier output power delivered to the load may be higher than the device dissipation. [Im]pulse-rated anodes are optimized for anode voltage surges and heat-up time constant, compared to their CW-rated counterparts.[12]
Due to dielectric losses, tube efficiency decreases with increasing operating frequency; the maximum anode voltage is therefore derated above a specified maximum frequency, which in turn reduces the available output power.[13]: 143 Usual cooling methods are:
—Internal anode:
Natural convection: Air moves freely along the tube; modest power levels only
Radiation: The (at maximum anode power) orange-red glowing anode, made from Graphite or from a high-work functionrefractory metal such as Molybdenum or Tantalum, optionally Zirconium-coated ("Pyrovac"), dissipates heat by its infrared radiation through the envelope, which in the case of high-power tubes, is made from an infrared-transparent hard glass (softening point ≥750 °C) such as Silica. The vacuum seals may still need forced-air cooling through special ventilated (=blow-through) bases such as the B4A or the B8F Eimac/JEDEC B8-236
—External anode protruding through the envelope so a good electrical and thermal contact can be made:
Improved Alumina insulation between the heater and cathode sleeve so the cathode could be elevated to a higher voltage above the heater supplyNote that a cathode positive to the heater was less detrimental to the oxide insulation between heater and cathode than the reverse, helping to prevent pyrometallurgicalelectrolytic reactions where the oxide touches the Nickel cathode, that could form conductive Aluminium tungstate and which could ultimately develop into a heater/cathode short-circuit
Ruggedized (more rigid) electrode supports to reduce microphonics and improve mechanical shock and vibration resistance
Mica spacers without sharp protrusions which could flake off and become loose inside the envelope, possibly lodging between the grids and thus changing the characteristics of the tube
Constricted envelope section to firmly hold specially shaped flakeless mica spacers in place (5920/E90CC, 6084/E80F, 6922/E88CC)
Up to 2 sequentially assigned letters, skipping the letters I and O and starting amplifier tubes from the letter A, working forward through the alphabet, while starting rectifier tubes from the letter Z, working backwards; since the two met (first the numerous 6-prefix, low elements-count tubes c. 1937), the single-letter namespace became exhausted, so combinations like AB, AC, AD, AE... were used, avoiding same-letter repetitions, reserving those ending in P for CRTs (see below) and henceforth assigning rectifiers also in forward-orderWherever possible, different-heater versions retained the original's letter combination; exceptions include: the 12BR7 and 9BR7 are unrelated to the 6BR7; the series heater versions of the 6.3 V/450 mA 6BL8/ECF80 are the 9.0-volts 9A8/PCF80 for 300mA strings, the 6.0-volts (thus requiring a different letter combination) 6LN8/LCF80 with controlled warm-up for 450mA strings, and the 4.6-volts 4BL8/XCF80 for 600mA stringsThe development of new tubes ended with the combination MY, although already by the end of the one-letter era, when the control grid top cap was discontinued and replaced by a regular base pin ("single-ended tube" - all connections on one end; not to be confused with the single-ended amplifier circuit), so-modified existing tubes, and the first new ones thereafter, were marked with a preceding letter S (6F5/12F5 → 6SF5/12SF5, 6K7/12K7 → 6SK7/12SK7, 1SA6-GT, 1SB6-GT, 6SB7Y, 6SC7/12SC7, 6SL7-G, 6SU7-GTY).[16] Similarly in the 1940s, 1.4 volt DC filament tubes (and the 2.8 volts center-tapped 3LE4, 3LF4) with a Loctal base were marked with a preceding letter L; 6.3- resp. 12.6-volts Loctal tubes were all assigned the prefixes 7 resp. 14 instead of 6 resp. 12, except 12B7 (=14A7)
A number with up to 2 digits: Count of active elements, including any shield and the heater in indirectly heated tubes – internally connected elements count as one; the use is somewhat arbitrary:
6 – Separate cathodes dual rectifier; tetrode; pentode; heptode (pentagrid converter); common cathode dual triode; common cathode dual diode + triode; separate cathodes dual diode; common cathode quad diode; tuning indicator; Triple-Twin; Sutton tube (=Reflex Klystron)
7 – Separate cathodes dual rectifier with a heater tap for a pilot lamp; pentode; heptode; Nonode; triode/hexode mixer; dual triode; common cathode triode + pentode; dual diode + pentode; dual diode + triode; diode + split-anode tetrode; common cathode dual pentode; separate cathodes triple diode; common cathode quad diode; tuning indicator
8 – Heptode; octode; triode/hexode mixer; dual or triple diode + triode; common cathode (dual) diode + pentode; separate cathodes dual triode; separate cathodes triode + tetrode; triple triode; diode + triple-anode tetrode; split-anode pentode; triode + pentode; quad diode; common cathode sextuple diode; beam deflection tube
9 – Separate cathodes dual diode + pentode; separate cathodes triode + pentode; common cathode dual triode + pentode; triple triode; separate cathodes dual pentode
10 – Separate cathodes triple triode; separate cathodes dual pentode; dual diode + dual triode
11 (Compactron limit) – Separate cathodes dual triode + pentode; separate cathodes triode + dual pentode; separate cathodes dual diode + dual triode; separate cathodes dual pentode
Exceptions include the 6L6-G/GT, 12L6-GT, 25L6-G/GT, 35L6-GT and 50L6-GT with a glass envelope and 5 elements, but legacy-named after the original 6L6 and 25L6 with a metal envelope connected to pin 1, making the sixth element
Optionally, a possible dash ("-") followed by a suffix of up to three Latin letters: Upgrades to the original model or different envelope outlines; the use is somewhat arbitrary:
X – Low loss ceramic base for improved RF performance
Y – Low loss Micanol base for improved RF performance
Optionally, manufacturers may decide to combine two designations into a single one, such as 6DX8/ECL84 (6DX8 and ECL84 being identical tubes under different naming schemes); 3A3/3B2 (drop-in replacement 3B2 superseding 3A3); 6AC5-GT/6AC5-G (6AC5-GT superseding 6AC5-G); 6BC5/6CE5 (6BC5 and 6CE5 being sufficiently identical)
Barretters/resistors for series-string AC/DC heaters were assigned the following subset:
The system was used in 1942–44 for professional/industrial/computer/telecommunications vacuum and gas-filled tubes, and assigned numbers with the base form "1A21" (therefore also referred to as the "1A21 system")[19]
Nullodes (discharge tubes which have no electrodes and interact only with electromagnetic fields passing through them) such as:
TR (Transmit/receive) cell, a water vapor discharge tube for use with waveguides in radar systems, short-circuits the receiver input to protect it while the transmitter operates on a shared antenna
ATR (Anti-transmit/receive) cell, decouples the radar transmitter from the antenna while not operating, to prevent it from wasting received energy
PTR (Pre-transmit/receive) cell, a low-Q discharge tube, precedes the main TR cell and produces a preliminary reflection to reduce the power level at the main TR cell
A four-digit system from 5500 to 8999 was maintained by JETEC since 1944 and by EIA since 1957, for professional/industrial/computer/telecommunications vacuum and gas-filled tubes, and all sorts of other devices requiring to be sealed off against the external atmosphere
Some manufacturers preceded the EIA number with a manufacturer's code:
S24 – Photocathode, transmissive mode, high-temperature/low-noise Bialkali K-Cs-Sb (Potassium-Caesium-Antimony) or Na2KSb (Sodium-Potassium-Antimony), Lime, Smax=45 µA⁄lm, λmax=385 nm, σtyp=67 mA⁄W, QE=21.8 %, DE=0.0003 fA⁄cm2, UV to red, used in oil well logging at up to 175 °C; very low dark current at room temperature, making it ideal for use in photon counting
S25 = S20r – S20 with a special cathode activation to extend the range to 930 nm
Where k = Conversion factor (lm/W); Styp = typical luminous sensitivity @2780K (µA⁄lm); Smax = max. luminous sensitivity (µA⁄lm) at wavelength λmax (nm); σtyp = typical radiant sensitivity (mA⁄W);[26] QE = typical quantum efficiency (%);[27] DE = typical photocathode dark emission @25°C (fA⁄cm2)
Eimac transmitting tubes system since 1945
Eimac and other manufacturers of high-power RF tubes use the following code:[28]
Optionally a slash ("/") followed by the RMA or EIA equivalent.
For examplessee below; Eimac also maintained an internal prototype numbering system consisting of the letters X or Y followed by 3 or 4 digits, such as "X-2159".
Pro Electron maintained only a subset of this part since 1966, with only the first letters E, P for the heater, only the second letters A, B, C, D, E, F, H, K, L, M, Y, Z for the type, and issuing only three- and four-digit numbers starting with 1, 2, 3, 5, 8, 9 for the base.[32]
D – 1.4 V DC filament for Leclanché cells, later low-voltage/low-power filament/heater:
625 mV DC directly heated for NiCd battery, series-heated two-tube designs such as hearing aids. If either filament breaks, further draining of all batteries stops[33]
Wide range 0.9 V to 1.55 V DC directly heated for dry cells
E – 6.3 V parallel heater; for 3-cell lead-acid vehicle crank batteries (mobile equipment) and for AC mains or horizontal-output transformers
F – 12.6 V DC parallel heater for 6-cell lead-acid vehicle crank batteries
G – Various heaters between 2.5 and 5.0 V AC (except 4 V) from a separate heater winding on a mains or horizontal-output transformer for the anode voltage rectifier
H – 150 mA AC/DC series heater; was shifted here from O
—Until at least 1938: 4 V DC filament for a 2-cell lead-acid battery[3]: 2 (no known examples assigned)
I – 20 V heater
K – 2.0 V filament/heater for a single lead-acid cell, later for AC transformers
L – 450 mA AC/DC series heater; was shifted here from Y around 1961 after the risk of confusing with Luftwaffe tubes had subsided
M – 1.9 V, directly heated
N – 12.6 V, indirectly heated
O –
150 mA series heater, for South American markets;[34] later shifted to H
Then informally used for imported RETMA 0-prefixnoble gas-filled cold-cathode tubes although their letter is meaningless; domestic types were shifted to Z before their mass production started
Lastly assigned to semiconductors, as these also had no heater
S – Separate cathodes Counter/Selector Dekatron that makes all cathodes available on individual pins for displaying, divide-by-n counter/timer/prescalers, etc.
T – Relay triode, a low-power triode thyratron, one starter electrode, may need illumination for proper operation if not radioactively primed for ion availability
U – Low-power tetrode thyratron, may mean:
Trigger tetrode, one starter electrode and a Townsend-type keep-alive/primer electrode to keep the ignition voltage constant, for analog RC timers, voltage triggers, etc.
Relay tetrode, two starter electrodes to make counters bidirectional or resettable
W – Trigger pentode, two starter electrodes and a Townsend-type keep-alive/primer electrode
X – Shielded Trigger pentode, two starter electrodes, a Townsend-type keep-alive/primer electrode and a conductive coating of the glass envelope inside connected to a separate pin
G8G 8-pin variants derived from B8G Loctal never got past prototyping, allegedly because the evacuation tip inside the narrow spigot broke off too easily
B11G 11-pin all-glass variant with one offset pin (EAA/UAA171, EBF/UBF171, ECH/UCH171, EEL/UEL171, EF/UF17x, EL/UL17x, EM/UM171)
For examplessee below; e.g. ECC40 is a dual triode with a 6.3 V heater and a Rimlock base; PABC80/9AK8 is a single diode + dual diode + triode with a 300 mA heater and a Noval base, also registered under RETMA as 9AK8; UM34 is a "Magic eye" tuning indicator with a 100 mA heater and an Octal base. If two tubes share the same M-P designation apart from the first letter (e.g. ECL82/6BM8, LCL82/11BM8, PCL82/16A8, UCL82/50BM8, XCL82/8B8) they will usually be identical except for heater ratings; there are exceptions, particularly among output types (for example, HL84, LL86/10CW5, PL84/15CW5, UL84/45B5, and XL86/8CW5 are series-heater versions of the EL86/6CW5 which is an EL84/6BQ5 resp. XL84/8BQ5 modified for a lower anode voltage). M-P designations do not reveal any similarity between different type families; e.g. the triode section of an ECL82 is not related to either triode of an ECC82/12AU7, whereas the triode section of an ECL86/6GW8 does happen to be similar to those of an ECC83/12AX7.
Special quality tubes
Premium/SQ tubes (also backronymed to French: "Sécurité - Qualité") for professional/industrial/computer/telecommunications purposes featured some modifications including those listed above
—SQ numbering before c. 1960: Function/type letter and base type number swapped;[39] most were modified versions of standard types (ECC82/12AU7 → E82CC/6189, ECC88/6DJ8 → E88CC/6922), but some were not pin-compatible (EF80/6BX6 → E80F/6084). A few SQ tubes did not have a standard equivalent (E55L/8233, E90CC/5920, E91H/6687). For examples see below, starting at DC
Little is known about this 1920s code other than that BVA/BRVMA members such as Cossor, EdiSwan and M-OV/GEC based their early designation systems on it
B – Dual triode
D – Diode
H – High-μ/high-impedance signal triode
HL – Medium-μ/medium-impedance signal triode
L – Low-μ/low-impedance signal triode
P – Power tube
S – Screen-grid tube (tetrode or pentode)
U – Rectifier
Compagnie des Lampes (1888, "Métal") system
The first (1888) incarnation of La Compagnie des Lampes produced the TM tube since 1915 and devised one of the first French systems;[19][42] not to be confused with Compagnie des Lampes (1921, "French Mazda", see below). This system was also used by the British ETA[43]
An optional number (may also appear at the end of the designation): Filament/heater voltage:[19]
4, 40–49, 400–499, 506 – 4 V, Mostly indirect, heaterSome power tubes in the low 40s and 400s have a 40 V/200 mA indirect heater for use in a series heater string
13 – 13 V/200 mA Indirect heater for use in vehicle equipment or in a series heater string
200–299 – 2 V Filament/heater
600–699 – 6 V Indirect heater
825 – 7.5 V/2 A Direct heater
An optional prefix:
D – 16 V/250 mADC, indirectly heated ("DC mains operated") receiver tube for use in a series heater string running on a then-still commonplace municipal DC mains system; cf. 180mADC standard
M – 4-volts AC, indirectly heated ("Mains Operated") receiver tube fed in parallel from a mains transformer
V – Vari-μ = remote-cutoff tube
X – Upgraded power rating
Letter(s): Function/type (derived from the BVA code):
B – Dual power triode
BU (Full-wave), SU (Half-wave) – High-vacuum rectifier
Most EdiSwan tube designations were based on the BVA code; phased out in the 1950s
K8B MazdaOctal bases have a larger spigot than K8A InternationalOctal, to better protect the evacuation tip, and the filament/heater is between pins 1 and 8 (IO: 2 and 7)
"AC*/" types are 4-volts AC, indirectly heated ("AC mains operated") receiver tubes fed in parallel from a mains transformer
"DC*/" types are indirectly heated ("DC mains operated") receiver tubes for use in a series heater string running on a then-still commonplace municipal DC mains system;[47]: 113 cf. 180mADC standard
The British Ericsson Telephones Ltd. (ETL), of Beeston, Nottingham (not to be confused with the Swedish TelefonAB Ericsson), original holder of the now-generic trademark Dekatron, used the following system:
A letter: Filling:
G – Noble gas-filled
V – Vacuum
Letter(s): Function/type:
C – Common cathode Counter Dekatron that makes only carry/borrow cathodes separately available for cascading
Optional preceding letter(s) before the 1935 update:
D – 16 V/250 mADC, indirectly heated ("DC mains operated") receiver tube for use in a series heater string running on a then-still commonplace municipal DC mains system; cf. 180mADC standard
M – 4-volts AC, indirectly heated ("Mains operated") receiver tube fed in parallel from a mains transformer
Most tubes before 1925 were assigned a letter and an optional Roman numeral (examples). Transmitting tubes started with the letter Z (Dutch: zendbuis, zendlamp).
In 1923, Philips introduced their Miniwatt brand to indicate Dull-Emitter tubes.
In 1925, the Roman numerals of tubes still in production were replaced by Arabic numerals, and since then, new tubes were assigned as explained below; new transmitting tubes were assigned according to the system above.[56]
Standard tubes 1925–34
The system consisted of one letter followed by 3 or 4 digits.[57]: 15 [3][31][19] It was phased out after 1934 when Philips adopted the Mullard–Philips scheme.
A letter: Filament/heater current
A – 60...90 mA
B – 100...200 mA (This designation lived on as the "B" (180 mA) in the Mullard–Philips scheme)
C – 200...390 mA (This designation lived on as the "C" (200 mA) in the Mullard–Philips scheme)
2 – Tetrode with a screen grid (grid #1 is the control grid)
3 – Power pentode
4 – Binode, a diode+triode or diode+tetrode
5 – Remote-cutoff RF tetrode
6 – Signal pentode
7 – Remote-cutoff RF pentode
8 – Sharp-cutoff hexode mixer
9 – Remote-cutoff hexode mixer
For examples[59]see below; the Milan branches of Philips and Siemens-Telefunken sold Philips and M-P tubes on the Italian market, some modified:[60]
WE11 – EBC3
WE12 – EM4
WE13 – ECL11 w/P8A base
WE14 = EL6
WE15 = EL3N
WE16 – EF11 w/P8A base
WE17 – EF6
WE18 = EFM1
WE19 – EBF2
WE20 – ECH11 w/P8A base
WE21 = AK1
WE22 = WE40 = ACH1
WE23 = E446 = RENS1284
WE24 = E447 = RENS1294
WE25 – (AF2)
WE26 = E444 = RENS1254
WE27 = E424N = REN904
WE28 = E499 = REN914
WE29 = E444S = REN924
WE30 = E443H = RES964
WE31 = AB1
WE32 = AK2
WE33 = AF3
WE34 = AF7
WE35 = AL1
WE36 = AB2
WE37 = ABC1
WE37F – ABF1
WE38 = AL4
WE39 = AC2
WE41 = ABL1
WE42 = AL5
WE43 = ACH1C
WE44 – Triode+hexode
WE51 = 1805 = RGN1064
WE52 = 1561 = RGN2004
WE53 = AZ2
WE54, WE55 – AZ1
WE56 = AZ4
WE65 – Full-wave rectifier
Professional tubes
Philips used a 3 to 5-digit system for professional/industrial/telecommunications tubes, which they phased out in the 1960s in favor of PE Professional tubes:
From 1924 to 1939, Philips printed a basing code on tube cartons and price lists, but not on the tubes themselves.[30]: 228 Socket designations such as "A-type" or "P-base" refer to this code, which was later (1950s) expanded to a <BasingCode><PinCount><Variant> format (where new designs were assigned the default basing codes "B" for normal tubes and "X" for microwave tubes):
A – 4-pin Transcontinental European base, originally Franco-British
B – 4-pin Telefunken base (1920s);[57]: 16f later 6-pin Continental European base (1930s)[3]: 15
C – American UV base (1920s); later 7-pin Continental European base (1930s)
D – 5-pin French base, used on bi-grille tetrodes
E – 4-pin French Radiola base (1920s); later Medium 7-pin American U7A base (1930s)
Y – 8-pin Continental European base, originally German steel tubes a.k.a. "German Metal Octal"
On cartons and tube lists, this basing code was followed by a number giving the maximum envelope diameter in mm
STC systems
"Brimar" standard tubes
For their Brimar ("British Manufactured American Radio" [tubes]) brand, WE-STC used the following scheme until the 1950s, when they phased it out in favor of the RETMA, EIA and Mullard–Philips systems:[19]
An optional number if none preceded the letter (notably with cold-cathode tubes):—Gas-filled trigger tubes: Max. ignition voltage—Voltage-regulator tubes: Burning voltage
A slash followed by a number:—High-vacuum tubes: 2-digit power rating followed by a sequentially assigned digit
A letter: Base
A – American base
B – British base
C – Edison screw base
D – Octal base
E – Special base
G – Wire-ends
J – Disk-seal tube
K – Miniature base
M – B8F Eimac/JEDEC B8-236 9-pin blow-through base
Valvo(de, it) was a major German electronic components manufacturer from 1924 to 1989; a Philips subsidiary since 1927, Valvo was one of the predecessors of NXP Semiconductors.
The system consisted of one or two letters followed by 3 or 4 digits. It was phased out after 1934 when Valvo adopted the Mullard–Philips scheme.
Polish Lamina(pl) transmitting tube designations consist of one or two letters, a group of digits and an optional letter and/or two digits preceded by a "/" sign.
A letter: Function/type:Two equal letters indicate a dual-system tube
P – Pentode
Q – Tetrode
T – Triode
A number: Maximum anode power dissipation in kW
An optional letter: Cooling method:
<none> – Radiation
P – Forced-air
W – Water
A slash followed by a digit:
1 – Tube for radio broadcasting and radiocommunication equipment
2 – Tube for industrial equipment
3 – Tube used in analog TV broadcasting equipment
4 – Tube for radiocommunication equipment with unbalanced modulation
Rundfunk- und Fernmelde-Technik(de, sv) was the brand of a group of telecommunications manufacturers in the German Democratic Republic. RFT used the Mullard–Philips and RETMA schemes for their signal and low-power tubes.
Transmitting tubes
The designation consists of 3 letters and a 3 or 4-digit number
The Tungsram system was composed of a maximum of three letters and three or four digits.[64][63] It was phased out after 1934 when Tungsram adopted the Mullard–Philips scheme, frequently preceding it with the letter T, as in TAD1 for AD1.
Letter(s): Function/type:A preceding letter A indicates an indirectly heated tube
Vacuum tubes produced in the former Soviet Union and in present-day Russia are assigned in Cyrillic. Some confusion has been created in transliterating these designations to Latin.
1929 System
The first system was introduced in 1929. It consisted of one or two cyrillic letter(s) and a sequentially assigned number with up to 3 digits[63]
The Chinese 广州曙光无线电厂 (GuangzhouShuguang Radio Factory) did the reverse, adapting the GOST system (below) to Latin letters for some of their tubes.[68]
GOST System
In 1950, a 5-element system (Russian: ГосударственныйСтандарт "State standard" ГОСТ↦GOST 5461-50 and later revisions 5461-56, 5461-59, 13393-67, 13393-76) was introduced in the (then) Soviet Union for designating receiver vacuum tubes.[69][permanent dead link][70]
A number: Filament/heater voltage rounded to the nearest whole number; 06 means 625 mV
П ⟼ P – All-glass Miniature 7-pin or Noval, envelope diameter 19 or 22 mm (3⁄4 or 7⁄8 in)
Р ⟼ R – Subminiature all-glass wire-ended, envelope diameter up to 5 mm (0.2 in)
А ⟼ A – Subminiature all-glass wire-ended, envelope diameter 5 to 8 mm (0.2 to 5⁄16 in)
Б ⟼ B – Subminiature all-glass wire-ended, envelope diameter 8 to 10 mm (5⁄16 to 0.4 in)
Г ⟼ G – Glass envelope, diameter 10 to 22 mm (0.4 to 7⁄8 in)
С ⟼ S – Glass envelope, diameter more than 22 mm (7⁄8 in), typically with an Octal base
An optional dash followed by one or more letters indicating special characteristics; in most cases this means construction upgrades rather than product binning:
Л ⟼ L – Beam deflection tube incl. CRTs (Russian: Электронно-лучевыеприборы "Electron beam device", "CRT"), ≥two-lettered; most CRT designations are preceded by a number giving the screen diagonal or diameter in cm (rounded-off to the nearest whole number)
ЛФ ⟼ LF – Analog function generator,(ru) an analog mask ROM + D/A converter combination consisting of an oscilloscope-type CRT with the Phosphor screen replaced by an electron-collecting target located behind an aperture mask perforated with sub-mm holes patterned such that the hole density z at any given x,y position is proportional to the value[73] of the desired f (x,y)
This system prefixes a three- or four-digit number with the letters "CV", meaning "common valve" (common to all three armed services), later "civilian valve".[82] It was introduced during the Second World War to rationalise the previous nomenclatures maintained separately by the War Office/Ministry of Supply, Admiralty and Air Ministry/Ministry of Aircraft Production on behalf of the three armed services (e.g. "ACR~", "AR~", "AT~", etc. for CRTs, receiving and transmitting valves used in army equipments, "NC~", "NR~" and "NT~" similarly for navy equipments and "VCR~", "VR~" and "VT~" etc. for air force equipments), in which three separate designations could in principle apply to the same valve (which often had at least one prototype commercial designation as well). These numbers generally have identical equivalents in both the North American, RETMA, and West European, Mullard–Philips, systems but they bear no resemblance to the assigned "CV" number.
Examples:
CV1988 = 6SN7-GT = ECC32 (not a direct equivalent as heater current is different and envelope is larger)
CV2729 = E80F – An SQ version of EF80 but with revised pinout and a base screen substituted for the RF screen
The "CV4000" numbers identify special-quality valves though SQ valves CV numbered before that rule came in retain their original CV number:
The "M8" in the part number indicates that it was developed by the military:
M8083 – Sharp-cutoff pentode, Miniature 7-pin base (SQ version of EF91 = 6AM6 = Z77)
M8162 = 6060 – Dual high-μ triode used as RF amplifier/mixer in VHF circuits, Noval base (SQ versions of ECC81 = 12AT7 = B309)
The principle behind the CV numbering scheme was also adopted by the US Joint Army-Navy JAN numbering scheme which was later considerably expanded into the US Federal and then NATO Stock Number system used by all NATO countries. This part-identification system ensures that every particular spare part (not merely thermionic valves) receives a unique stock number across the whole of NATO irrespective of the source, and hence is not held inefficiently as separate stores. In the case of CV valves, the stock number is always of the format 5960-99-000-XXXX where XXXX is the CV number (with a leading 0 if the CV number only has 3 digits).
U.S. naming systems
One system prefixes a three-digit number with the letters "VT", presumably meaning "Vacuum Tube". Other systems prefix the number with the letters "JHS" or "JAN". The numbers following these prefixes can be "special" four-digit numbers, or domestic two- or three-digit numbers or simply the domestic North American "RETMA" numbering system. Like the British military system, these have many direct equivalents in the civilian types.
Confusingly, the British also had two entirely different "VT" nomenclatures, one used by the Royal Air Force (see the preceding section) and the other used by the General Post Office, responsible for post and telecommunications at the time, where it may have stood for "valve, telephone"; none of these schemes corresponded in any way with each other.
Examples:
"VT" numbering systems
North American VT90 = 6H6
British (RAF) VT90 – VHF Transmitting triode
British (GPO) VT90 = ML4 = CV1732 – Power triode
VT104 – RF pentode
VT105 – RF triode
Other systems
Since the 1920s, several manufacturers introduced proprietary numbering systems (examples), some of which grew into informal standards adopted by other manufacturers; the use was not rigorously systematic.
The American two-digit system, starting with the UV-201-A triode, which was abbreviated as "type '01-A", and extended almost continuously up into the 1980s
Several manufacturers used acronym prefixes to indicate the function or type for (mostly professional) tubes (ex.1, ex.2, ex.3, ex.4), or as a manufacturer's code:
Powered by a storage battery (anode), and one 2 volt lead-acid cell (filament)
19 – Dual power triode, 260 mA filament, U6A base, also used in farm radios with 6-volt vibrator power supplies; early version of Octal type 1J6-G
25S = 1B5 (Commonly branded as 1B5/25S) – Dual diode + medium-μ triode, gm = 575 µ℧, μ = 20, 60 mA filament, U6A base; drop-in replacement for Grigsby-Grunow G-25-S
30 = RCA-230 = CX-330 – Medium-μ power triode, gm = 900 µ℧, μ = 9.3, 60 mA filament, popular among radio amateurs of the day; upgraded type 01-A; early UX4-based version of Octal type 1H4-G
31 = RCA-231 = CX-331 – Power triode, gm = 1.05 m℧, μ = 3.8, 130 mA filament, UX4 base
32 = RCA-232 = CX-332 – Sharp-cutoff tetrode, gm = 650 µ℧, μ = 780, 60 mA filament, UX4 base
33 = RCA-233 = C-333 – Power pentode, gm = 1.7 m℧, μ = 90, 260 mA filament, UY5 base
34 = RCA-234 = CX-334 – Remote-cutoff pentode, gm ≤ 620 µ℧, μ ≤ 620, 60 mA filament, UX4 base with control grid on top cap
49 – Dual-grid power triode (technically a tetrode), 120 mA filament, UY5 base; similar to type 46
Powered by a storage battery (anode), and three lead-acid cells (cheap 6 volt vehicle crank battery) with a rheostat (filament)
00-A – Grid-leak detector triode with a trace of Argon, gm = 666 µ℧, μ = 20, 250 mA filament - this is the number used in most tube manuals. There were two base variants:
UV-200-A – UV4 Stub pins, Bayonet
UX-200-A = CX-300-A – UX4 Long pins, push-in
01 series – General-purpose low-μ triodes used as RF amplifier, detector, AF amplifier and power triode, most popular in the 1920s - this is the number used in tube manuals and for replacements manufactured after 1930. There were two base and four filament variants:
UV-201 (UV4), UX-201 (UX4) – 1.0 A
01-A (UV-201-A, UX-201-A = CX-301-A) – 250 mA, gm = 800 µ℧, μ = 8, most commonly used
UX-201-B – 125 mA
UX-201-C – 60 mA
12 = UX-112 (500 mA filament), 12-A = UX-112-A = CX-112-A (250 mA filament) – Medium-μ triode used as detector, AF driver or AF output, but not as an RF amplifier, UX4 base; not to be confused with the WX-12
21 = UX-221 = UX-201-C – Triode, export version of the UX-201-A
40 = UX-240 – Medium-μ triode, gm = 200 µ℧, μ = 30, 250 mA filament, UX4 base, introduced in 1927; upgraded type 01-ABecause the 40 was the highest-gain triode available (until the introduction in April 1933 of 2A6 (AC heater diode+triode, μ = 100), and in 1939 of Octal 1H5-GT/DAC32 and Loctal 1LH4 (DC filament diode+triodes, both μ = 65)), advertising literature of the time lists it as a "high-μ" triode, although it is now classified as a medium-μ triode. By comparison, the two AC triodes 26 and 27, introduced in the same time period, had μ = 8.3 resp. 9
10 = UX-210 = CX-310 – 12 W Power triode, gm = 1.6 m℧, μ = 8, 7.5 V/1.25 A filament, UX4 base
26 = UX-226 = CX-326 – Medium-μ triode, gm = 1.15 m℧, μ = 8.3, 1.5 V/1.05 A filament, UX4 base, used in early AC radio receivers manufactured in the late 1920s as an RF or AF amplifier, but not as a detector or power output tube
45 = UX-245 = CX-345 – 2 W Power triode, gm = 2.05 m℧, μ = 3.5, 2.5 V/1.5 A filament, UX4 base
46 – 1.25 W Dual-grid power triode (technically a tetrode), 2.5 V/1.75 A filament, UY5 base. Two modes of operation available:
#2 Grid tied to anode for use as single-tube Class-A audio driver
Grids #1 and #2 tied together for use as push-pull Class-B output
47 = RCA-247 = C-347 – 2.7 W Power pentode, gm = 2.5 m℧, μ = 150, 2.5 V/1.75 A filament, UY5 base; 46 with a suppresser grid connected to a filament center-tap
50 = UX-250 = CX-350 – 4.6 W Power triode, gm = 2.1 m℧, μ = 3.8, 7.5 V/1.25 A filament, UX4 base
52 – Dual-grid power triode mostly used in early car radios (technically a tetrode), 6.3 V filament; similar to types 46 and 49[citation needed]
71 (5 V/500 mA filament), 71-A = UX-171-A = CX-371-A (5 V/250 mA filament) – 790 mW Power triode, UX4 base
80 = UX-280 = CX-380 – Full-wave rectifier used in early power supplies or battery eliminators; derived from the 13 (UX-213); early UX4-based version of Octal type 5Y3-G
81 = UX-281 = CX-381 – Half-wave rectifier; derived from the 16-B (UX-216-B)
Powered by a 2 volt lead-acid cell, for use in circuits requiring a floating (=indirectly heated) cathode, such as the Autodyne, in devices otherwise using directly heated 2 volt DC filament tubes
15 – Sharp-cutoff pentode used in farm radios, gm = 750 µ℧, μ = 600, 220 mA heater, UY5 base with control grid on top cap
24 = UY-224 = C-324, 24-A = UY-224A = C-324A – Sharp-cutoff tetrode, gm = 1.05 m℧, μ = 630, 1.75 A heater, UY5 base with control grid on top cap
27 = UY-227 = C-327 – Medium-μ triode, gm = 1 m℧, μ = 9, 1.75 A heater, UY5 base, the first American-made, commercially available tube with an indirectly heated, floating cathode, which is necessary for detector circuits in AC powered tube radios (see introduction)
35 = UY-235 = C-335 = 51 (Grigsby-Grunow G-51-S, commonly branded as 35/51) – Remote-cutoff variant of the 24-A tetrode, gm ≤ 1.05 m℧, μ ≤ 420
53 – Dual power triode, Class-B, gm = 3.2 m℧, μ = 35, U7B base; 6A6 or Octal-based 6N7 with a 2.5 V/2 A heater
55 (G-55-S) – Dual diode + medium-μ triode, gm = 1.1 m℧, μ = 8.3, U6A base; 85 or Octal-based 6V7-G with a 2.5 V/1 A heater; not similar to 75
56 (G-56-S) – Medium-μ triode, gm = 1.45 m℧, UY5 base; 27 with a higher μ (13.8 vs. 9) and less heater current (1 A vs. 1.75 A); similar to Octal-based 6P5-G
Powered by an AC transformer or a vehicle crank battery
36 = RCA-236 = C-336 – Sharp-cutoff RF tetrode, gm = 1.08 m℧, μ = 595, 300 mA heater, UY5 base with control grid on top cap
37 = RCA-237 = C-337 – Medium-μ triode, gm = 1.1 m℧, μ = 9.2, 300 mA heater, UY5 base
38 = RCA-238 – Power pentode, gm = 1.2 m℧, μ = 120, 300 mA heater, UY5 base
39 = 44 (Slightly higher cutoff, commonly branded as 39/44) – Remote-cutoff RF pentode, gm ≤ 1.05 m℧, μ ≤ 1050, 300 mA heater, UY5 base
41 – Power pentode, gm = 2.2 m℧, μ = 150, 400 mA heater; early U6A-based version of Octal type 6K6-G, and Loctal type 7B5
42 – Power pentode, gm = 2.6 m℧, μ = 260, 700 mA heater; early U6A-based version of Octal type 6F6-G; types 18 or 2A5 with a 6.3 V heater
44 – See type 39
64 (6.3 V/400 mA heater), 64-A = 36 (6.3 V/300 mA heater) – Sharp-cutoff tetrode, UY5 base
65 (6.3 V/400 mA heater), 65-A = 39/44 (6.3 V/300 mA heater) – Remote-cutoff pentode, UY5 base
67 (6.3 V/400 mA heater), 67-A = 37 (6.3 V/300 mA heater) – Medium-μ triode, UY5 base
68 (6.3 V/400 mA heater), 68-A = 38 (6.3 V/300 mA heater) – Power pentode, UY5 base
69 – Wunderlich detector, U6A base
70 – Wunderlich detector used in Mission Bell model 19 and Sparton model 34 car radios, U6A base. Listed in early Philco tube lists
75 – 6H6-type Dual diode + 6F5-type high-μ triode, gm = 1.1 m℧, μ = 100; 2A6 with a 6.3 V/300 mA heater; early U6A-based version of Octal types 6B6-G & 6SQ7-GT, and Loctal type 7B6, and Miniature 7-pin type 6AV6/EBC91
76 – Medium-μ triode, gm = 1.45 m℧, μ = 13.8; 56 with a 6.3 V/300 mA heater; early UY5-based version of Octal type 6P5-G
77 – Sharp-cutoff pentode, gm = 1.25 m℧, μ = 1500, 300 mA heater; early U6A-based version of Octal type 6J7-G/EF37
78 – Remote-cutoff pentode, gm ≤ 1.45 m℧, μ ≤ 1160, 300 mA heater; early U6A-based version of Octal type 6K7-G/PF9
79 – Dual power triode, 600 mA heater; early U6A-based version of Octal type 6Y7-G
84 = 6Z4 (Commonly branded as 84/6Z4) – Full-wave rectifier; early UY5-based version of Octal type 6X5-GT, and Loctal 7Y4, and Miniature 7-pin 6X4/6BX4/EZ90
85 (Grigsby-Grunow G-85-S) – Dual diode + medium-μ triode, gm = 1.1 m℧, μ = 8.3; 55 with a 6.3 V/300 mA heater; early U6A-based version of Octal type 6V7-G
89, 89Y (Micanol base) – 3.4 W Power pentode, gm = 1.8 m℧, 6.3 V/400 mA heater, U6A base. Three modes of operation available:
Standard pentode circuit for use as single-tube Class-A audio driver, μ = 125
Grids #2 and #3 tied to anode (triode strap) for use as single-tube Class-A audio driver, μ = 4.7
Grids #1 and #2 tied together, #3 grid tied to anode for use as push-pull Class-B output
92 = Ken-Rad KR22 – Wunderlich detector, U6A base
96 – Half-wave Mercury-vapor rectifier, 10 V forward drop
14 – Sharp-cutoff tetrode used in Philco models 46 (110VDC version) and 46E; 24-A with a 14 V/300 mA heater
17 – Medium-μ triode used in Philco models 46 (110VDC version) and 46E; 27 with a 14 V/300 mA heater
18 – Power pentode; 42 with a 14 V/300 mA heater; no known commercial production, superseded by 43
43 – Power pentode, 25 V/300 mA series heater; early U6A-based version of Octal type 25A6-G
48 – Power tetrode, gm = 3.8 m℧, μ = 2.5 (triode strap), 30 V/400 mA heater, U6A base, designed for use on 115VDC mains systems, popular in 32-volt farm radios where two parallel or push-pull-connected 48s can deliver a modest audio power with anode and screen voltages as low as 28 volt; cf. 28D7-W
Used in a similar way to a Zener diode, at higher voltages
—Miniature 7-pin-based regulators: Letter order (A-B-C) indicates decreasing voltage; cathode on pins 2, 4, 7; anode on pins 1, 5
—Octal-based regulators: Letter order (A-B-C) indicates increasing voltage; cathode on pin 2; anode on pin 5; jumper between pins 3 and 7 to unpower the device when the regulator is pulled from its socket
0A4-G (Z300T) – 25 mAavg, 100 mApeak Gas triode, Octal base, designed for use as a ripple control receiver - with the cathode tied to the midpoint of a series-resonance LC circuit across live mains, it would activate a relay in its anode circuit while fres is present
0A5 – 1 kV, 10 Apeak Gas tetrode with a keep-alive/primer anode and a shield grid, Miniature 7-pin base, designed for relay drive and general switching
These tubes have directly heated cathodes, usually running on a single NiCd cell; pentodes and heptodes specify the filament polarity because the suppressor grid is internally connected to the negative filament end; 1AD4, 1AG4, 1AG5, 1AK4 and 1AK5 pentodes have a split suppressor grid, its halves tied to the positive resp. negative filament end
1E3 – UHF Triode, 220 mA filament, Noval base
1AB5 – 1LN5 with higher transconductance and a 1.20 V/130 mA filament, Loctal base
1AE4 – Sharp-cutoff pentode, 100 mA filament, Miniature 7-pin base
The following low-frequency Pencil subminiature tubes were used in post-World War II walkie-talkies, pocket-sized portable radios, and hearing aids; all have all-glass envelopes 1+1⁄8 to 2 in (29 to 51 mm) long and with diameters of:
—Elliptical cross-section envelope with Flat-Press inline base/wire-ends: 0.285 by 0.366–0.4 in (7 by 9–10 mm)
—Round cross-section envelope with circular base/wire-ends: ca. 0.366–0.4 in (9–10 mm)
1C8 – Heptode pentagrid converter with American grid topology, 40 mA filament, round/circular, 8-pin/wire-ends
1D3 – Low-μ UHF triode, 300 mA filament, round/circular, 8-pin/wire-ends
1E8 – Heptode pentagrid converter with American grid topology, 40 mA filament, Sub-Minar round/circular, 8-pin/wire-ends
1Q6 – Diode + AF pentode, 40 mA filament, round/circular, 8-pin/wire-ends; similar to 1LD5/DAF26, 1S5/DAF91, but rated for lower voltages
Designed for use in dry cell battery-only or in Three-way portable (AC/DC/Dry-cell) radio receivers; most are directly heated, pentodes and heptodes specify the filament polarity
1A3/DA90 – Indirectly heated FM discriminator diode used as a detector in some portable AM/FM receivers, 150 mA heater, Miniature 7-pin base
1A5/DL31 – 115 mWoutput AF Power pentode, 50 mA filament; 1LA4 with an Octal base
1A7-GT/DK32 – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 50 mA filament, Octal base, introduced in 1938; re-engineered variant of 1A6, 1D7-G
1B7-GT – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 100 mA filament, Octal base; re-engineered variant of 1C6, 1C7-G for shortwave use
1B8-GT, 1D8-GT – Diode + triode + 200 mWoutput power pentode, 100 mA filament, Octal base with triode grid on top cap
1C5-GT/DL35 – 240 mWoutput Power pentode, 100 mA filament, Octal base; similar to 3Q5-GT/DL33
1E4-G (μ = 14), 1G4-GT/G (μ = 8.8) – AF triode, 50 mA filament, Octal base
1G6-G, 1G6-GT – 675 mWoutput Dual power triode, μ = 30, 100 mA filament, Octal base
1H5-GT/DAC32 – Diode + high-μ AF triode, 50 mA filament, Octal base with triode grid on top cap
1N5-GT/DF33 – Sharp-cutoff pentode, 50 mA filament, Octal base
1N6-G – Diode + 100 mWoutput power pentode, 50 mA filament, Octal base
1P5-G, 1P5-GT – Sharp-cutoff pentode, 50 mA filament, Octal base with control grid on top cap
1R5/DK91 – Heptode pentagrid converter with American grid topology, anode voltage in the 45...90 volt range, 50 mA filament, Miniature 7-pin base; ruggedized version: 1R5-WA
1R5-SF = 1AQ5 – 1R5/DK91 with a 25 mA filament
1S4/DL91 – 270 mWoutput AF power pentode used as Class-A amplifier, anode voltage in the 45...90 volt range, 100 mA filament, Miniature 7-pin base
1S5/DAF91 – Diode + sharp-cutoff pentode used as detector and first AF amplifier, anode voltage in the 67...90 volt range, 50 mA filament, Miniature 7-pin base
1S5-SF = 1S5T = 1AR5 – 1S5/DAF91 with a 25 mA filament
These tubes were made for home storage battery receivers manufactured during the early to mid-1930s; all are directly heated with a 2.0 volt DC filament despite the 1-prefix, intended to distinguish them from the 2.5 volt AC heated tubes listed below
1A4 = 1A4P – Remote-cutoff pentode, suppressor grid internally tied to 60 mA filament negative or center-tap, UX4 base with control grid on top cap
1A4T – Remote-cutoff tetrode; 1A4P without a suppressor grid
1A6 (U6A base), 1D7-G (Octal base) – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 60 mA filament, up to only 10 MHz due to low heater power and consequent low emission in the oscillator section, also occasionally used as a grid-leak detector
1B4 = 1B4P – Sharp-cutoff pentode, suppressor grid internally tied to the negative 60 mA filament end, UX4 base with control grid on top cap
1B4T – Sharp-cutoff tetrode; 1B4P without a suppressor grid
1C4 – Remote-cutoff pentode, 120 mA filament, UX4 base with control grid on top cap
1C6 (U6A base), 1C7-G (Octal base) – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 120 mA filament; 1A6, 1D7-G with double the heater power and double the frequency range
1D4 – 1.8 W Power pentode, suppressor grid internally tied to the negative 240 mA filament end; 1L5-G with a UY5 base
1D5-G = 1D5-GP – 1A4P with an Octal base
1D5-GT – 1A4T with an Octal base (Note: This is a shouldered "G" Octal, not a cylindrical "GT" Octal)
1E5-G = 1E5-GP – 1B4P with an Octal base
1E5-GT – 1B4T with an Octal base (Note: This is a shouldered "G" Octal, not a cylindrical "GT" Octal)
1E7-G, 1E7-GT – 2×1.5 W Dual power pentode used as a driver when parallel-connected, or as a push-pull output, 240 mA filament, Octal base
1F4 (UY5 base), 1F5-G (Octal base) – 1.75 W Power pentode, suppressor grid internally tied to the negative 120 mA filament end
1F6 (U6A base), 1F7-G, 1F7-GH (Octal base, one diode at each filament end), 1F7-GV (both diodes at the negative filament end) – Dual diode + sharp-cutoff pentode with control grid on top cap, suppressor grid internally tied to the negative 60 mA filament end
1G5-G – 1.25 W Power pentode, suppressor grid internally tied to the negative 120 mA filament end, Octal base
1H4-G, 1H4-GT – Medium-μ triode, 60 mA filament, can be used as a power triode; type 30 (=upgraded type 01-A) with an Octal base
1H6-G, 1H6-GT – See 1B5/25S
1J5-G – 450 mWoutput AF power pentode, suppressor grid internally tied to the negative 120 mA filament end; 950 with an Octal base
1J6-G, 1J6-GT – 2.1 Woutput Dual power triode, 240 mA filament; type 19 with an Octal base
1K4 (UX4 base), 1K5-G (Octal base) – 500 mW AF power pentode with control grid on top cap, suppressor grid internally tied to the negative 120 mA filament end
1K6 (U6A base), 1K7-G (Octal base) – Dual diode + 350 mW AF power pentode with control grid on top cap, suppressor grid internally tied to the negative 120 mA filament end
1L5-G – 1D4 Power pentode with an Octal base
1M5-G – Remote-cutoff pentode with control grid on top cap, suppressor grid internally tied to the negative 120 mA filament end, Octal base
1AJ2 – Compactron CRT EHT rectifier, 1.25 V/200 mA filament
1AY2 – Duopin 2-pin base CRT EHT rectifier; similar to 1B3-GT/DY30
1B3-GT/1G3-GT/DY30 = 1Ц7С↦1C7S – CRT EHT rectifier, 1.25 V filament, peak inverse voltage of 30 kV, anode current 2 mA average, 17 mA peak, Octal base, common in 1950s and early 1960s monochrome TV receivers; derived from the earlier industrial type 8016
1BC2 – CRT EHT rectifier, 1.25 V/200 mA filament, Noval base
1BC2A, 1BC2B – 1BC2 with internal X-radiation shielding
1BG2/DY51 – 15 kV Subminiature CRT EHT rectifier used in portable TV receivers, half-indirect 1.4 V/575 mA heater, all-glass, heater wires on one end, anode wire on the other
1BQ2/DY802 – 20 kV CRT EHT rectifier, half-indirect 1.4 V/600 mA heater, Noval base, silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions
1BY2 – Compactron CRT EHT rectifier, 1.25 V/200 mA filament
1BY2A – 1BY2 with internal X-radiation shielding
1H2 – CRT EHT rectifier, half-indirect 1.4 V/550 mA heater, Noval base
1S2/DY86 = 1Ц21П↦1C21P – 22 kV, 800 µA Half-indirectly heated CRT EHT rectifier, Noval base with anode on top cap; 6S2/EY86 with a 1.4 V/550 mA heater
1S2A/DY87 – 1S2/DY86 variant for operation at high altitudes with a silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions; 6S2A/EY87 with a 1.4 V/550 mA heater
1T2 = Brimar R16 – Subminiature CRT EHT rectifier, 1.4 V/140 mA filament, filament wires on one end, anode wire on the other
1V2 – CRT EHT rectifier, 625 mV/300 mA filament, Miniature 7-pin base
1X2 – CRT EHT rectifier, 1.25 V/200 mA filament, Noval base
1X2A, 1X2B, 1X2C – 1X2 with internal X-radiation shielding
1Y2 – 50 kVPIV, 10 mApeak, 2 mAavg CRT EHT rectifier usable up to 1 MHz, 1.5 V/290 mA filament, UX4 base
1Z1 – CRT EHT rectifier, 0.7 V/180 mA filament, Octal base
1Z2 – CRT EHT rectifier, 1.25 V/265 mA filament, Noval base
Tubes used in AC-powered radio receivers since the early 1930s; most are indirectly heated
2A3 – 15 W Directly AC-heated AF power triode now used in audiophile gear, μ = 4.2, UX4 base; 6A3 with a 2.5 V/2.5 A filament
2A5 – 11 W Power pentode; 6F6 with a U6A base; types 42, 6F6 with a 2.5 V/1.75 A heater
2A6 – Dual diode + high-μ triode, U6A base with control grid on top cap; types 75, 6B6-G with a 2.5 V/800 mA heater
2A7 – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, U7A base; 6A7, 6A8, 12A8 with a 2.5 V/800 mA heater
2B6 – Triple-Twin AF signal + 4-watts zero bias power triode, 2.25 A heater, internally connected as a cathode follower like today's Darlington transistors; cf. 295, 6AC6, 6B5, 6N6-G
2B7 – Dual diode + remote-cutoff pentode, U7A base with control grid on top cap; 6B7, 6B8-G with a 2.5 V/800 mA heater
2E5 – Top-view, "Magic Eye"-type tuning indicator; 2G5 with a sharp-cutoff driver triode; 6E5 with a 2.5 V/800 mA heater
2G5 – Top-view, "Magic Eye"-type tuning indicator; 2E5 with a remote-cutoff driver triode; 6G5/6U5 with a 2.5 V/800 mA heater
2A4-G – 200 V, 100 mAavg, 1.25 Apeak Argon triode thyratron, negative control characteristic, 2.5 A filament, 7-pin Octal base
2B4 = 885 – 300 V, 1 mAavg, 300 mApeak Gas-filled triode thyratron, negative control characteristic, used in DuMont oscilloscopes as a sweep generator; 6Q5-G = 884 with a 2.5 V/2.5 A heater and a UY5 base
2C4 – 185 V, 5 mAavg, 20 mApeak Gas-filled triode thyratron, negative control characteristic, used in portable equipment, 650 mA heater, Miniature 7-pin base but exhaust/evacuation tip may be at top or at bottom
Many 6-prefix tubes were also available as 3-prefix with a 3.15 V heater with twice the heater current, for television receivers with series heater strings
3DG4 – 1.05 kV, 2×1.2 A Full-wave rectifier, 3.3 V/3.8 A filament, 5-pin Octal base
These tubes are directly heated with a center-tapped filament, so they can be switched to 1.4 V for use in Three-way portable (AC or DC mains, or dry batteries) radio receivers
3A4/DL93 – 700 mW RF/AF power pentode, 100 resp. 200 mA filament, Miniature 7-pin base
3A5/DCC90 – 2×1 W, 40 MHz Dual power triode, μ = 15, 110 resp. 220 mA filament, Miniature 7-pin base
3A8-GT – Diode + triode + pentode, 50 resp. 100 mA filament with internal shield tied to center-tap, Octal base; 1H5-GT/DAC32 + 1N5-GT/DF33 in one envelope
3B4/DL98 – 1.25 W, 100 MHz Power pentode, 2.5 V/165 mA resp. 1.25 V/330 mA filament with suppressor grid tied to center-tap, Miniature 7-pin base
3B5-GT – 200 mWoutput AF beam power pentode, 67.5 V anode voltage, 50 resp. 100 mA filament with beam plates tied to center-tap, Octal base
3B7 – 1.4 W, 125 MHz Dual power triode, μ = 20, 110 resp. 220 mA filament, Loctal base
3C4/DL96 – 200 mW AF power pentode, 25 resp. 50 mA filament with suppressor grid tied to center-tap, Miniature 7-pin base
3C6 = Philco XXB – Medium-μ dual triode, 50 resp. 100 mA filament, Loctal base
3E5 – 200 mW AF beam power pentode, 25 resp. 50 mA filament with beam plates tied to center-tap, Miniature 7-pin base
3E6 – Sharp-cutoff pentode, 50 resp. 100 mA filament with internal shield tied to center-tap, Loctal base
3LE4 – 325 mW AF power pentode, 25 resp. 50 mA filament with suppressor grid tied to center-tap, Loctal base
3LF4 – 3Q5-GT/DL33 with a Loctal base
3Q4/DL95 – 270 mW AF power pentode, 25 resp. 50 mA filament with suppressor grid tied to center-tap, Miniature 7-pin base
3Q5-GT/DL33 – 330 mW AF beam power pentode, 50 resp. 100 mA filament with beam plates tied to center-tap, Octal base
3S4/DL92 – 1S4/DL91 AF power pentode with the suppressor grid tied to the center-tap of the 50 resp. 100 mA filament, Miniature 7-pin base
3S4-SF = 3S4T = 3W4 – 3S4/DL92 with a 2.8 V/25 mA resp. 1.4 V/50 mA filament
3V4/DL94 – 3Q4/DL95 AF power pentode with a different Miniature 7-pin base pinout; ruggedized version: 3V4-WA
3AT2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/220 mA heater
3AT2B – 3AT2 with internal X-radiation shielding
3AW2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/350 mA heater
3AW2A – 3AW2 with internal X-radiation shielding
3BF2 - Compactron CRT EHT rectifier for analog color TV receivers, 3.6 V/225 mA heater
3BL2 – Compactron CRT EHT rectifier for analog color TV receivers, 3.3 V/285 mA filament
3BL2A – 3BL2 with internal X-radiation shielding
3BM2 – Compactron CRT EHT rectifier for analog color TV receivers, 3 V/300 mA filament
3BM2A – 3BM2 with internal X-radiation shielding
3BN2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/300 mA heater
3BN2A – 3BN2 with internal X-radiation shielding
3BS2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/480 mA quickstart heater
3BS2A, 3BS2B – 3BS2 with internal X-radiation shielding
3BT2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/480 mA quickstart heater
3BT2A – 3BT2 with internal X-radiation shielding
Note: All subsequent CRT EHT rectifiers were designed after the 1967 GE scandal and had internal X-radiation shielding right from the start
3BW2 – Compactron CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/480 mA quickstart heater, has a diffusion-bonded cathode, which prevents anode-to-cathode arcing caused by emissive particles being pulled from the cathode coating by the high electrostatic field
3CA3 – CRT EHT rectifier for analog color TV receivers, Octal base, half-indirect 3.6 V/225 mA heater
3CN3 – CRT EHT rectifier with a diffusion-bonded cathode for analog color TV receivers, Octal base, half-indirect 3.15 V/480 mA quickstart heater
3CU3 – CRT EHT rectifier for analog color TV receivers, Octal base, 3.15 V/280 mA filament
3CZ3 – CRT EHT rectifier for analog color TV receivers, Octal base, half-indirect 3.15 V/480 mA quickstart heater
3DA3 – CRT EHT rectifier, 3.15 V/480 mA heater, Octal base
3DB3/3CY3 – CRT EHT rectifier, 3.15 V/245 mA heater, Octal base
These tubes all have a 6.3 V filament/heater. Note: 6-prefix tubes with center-tapped heaters are listed under 300 mA series heater tubes
6A3 (UX4 base), 6B4-G (Octal base) – 15 W Directly AC-heated AF Power triode, μ = 4.2; 2A3 with a 6.3 V/1 A filament
6A4 = Raytheon LA (Commonly branded as 6A4/LA) – 1.4 WoutputDirectly AC-heated power pentode, 300 mA filament with suppressor grid internally tied to a center-tap, UY5 base
6A5-G – 15 W Power triode, μ = 4.2, 1 A heater with cathode internally tied to a center-tap, Octal base
6A6 – 2×5.5 W Dual power triode used as a Class-A audio driver or a Class-B audio output, U7B base; 6.3 V/800 mA heater version of type 53 which had a 2.5 V/2 A heater; Octal version: 6N7
6A7 (U7A base), 6A7S (U7A base with external shield tied to cathode, used as renewal type for Majestic receivers), 6A8-G/PH4 (Octal base), 6A8-GTX (Ceramic base) – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap; 2A7, 12A8 with a 6.3 V/300 mA heater; Loctal version: 7B8; similar to M-OV/GEC X63
6B3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Noval base with cathode on top cap
6B4-G – See 6A3
6B5 (U6A base), 6N6-G (Octal base) – Triple-Twin AF signal + 4-watts zero bias power triode, internally connected as a cathode follower like today's Darlington transistors, μ = 58, 800 mA heater; cf. 295, 2B6, 6AC6
6B6-G – Dual diode + high-μ triode, grid on top cap, 300 mA heater; type 75 with an Octal base, later 6SQ7 (without control grid top cap); Miniature 7-pin version: 6AV6/EBC91
6B7 (U7A base), 6B8, 6B8-G, 6B8-GT (Octal base) – Dual diode + semiremote-cutoff pentode with control grid on top cap. The diodes were mostly used as AM detector and AVC rectifier in superheterodyne receivers. The pentode was used as variable-gain IF or AF amplifier, or in reflex receivers - in a typical 2B7/6B7/6B8-G reflex circuit, the IF signal from the converter is injected into the pentode and amplified. The diodes then extract the AF signal from the RF signal. The AF signal is then re-injected into the pentode, amplified, and sent to the audio output tube;[86] 2B7 with a 6.3 V/300 mA heater; similar to EBF32
6B10 – Compactron Dual diode + medium-μ dual triode used as horizontal phase detector and horizontal oscillator, 600 mA heater
6C5, 6C5-G, 6C5-GT – Triode, 300 mA heater, 6-pin Octal base
6C6 (U6A base), 6J7, 6J7-G/EF37, 6J7-GT (Octal base), 6J7-GTX (Ceramic base) – Dual-control, sharp-cutoff RF pentode used as tuned RF amplifier or biased detector or AF amplifier, also used in test equipment, 300 mA heater, control grid on top cap; derived from type 57, which had a 2.5 volt heater; similar to types 1603, 77 and Octal type 6SJ7 (control grid on pin 4)
6C7 – Dual diode + medium-μ triode used as renewal type for Majestic receivers, 300 mA heater, U7A base with shield on pin 3 and grid on top cap; similar to later Octal types 6R7 and 6SR7
6C8-G – Dual triode, 300 mA heater, Octal base with one control grid on top cap
6C9 – Dual VHF tetrode, 400 mA heater, B10G Decar base (=Noval plus center pin)
6C10 – Compactron Triple high-μ triode, 600 mA heater – not related to the Mazda/EdiSwan 6C10 triode-hexode
6D4 – 180 V, 25 mAavg, 100 mApeak Argon triode thyratron, negative control characteristic, 250 mA heater, Miniature 7-pin base, found an additional use as a 0 to 10 MHz noise source, when operated as a diode (starter tied to cathode) in a transverse 375 G (37.5 mT) magnetic field. Sufficiently filtered for "flatness" ("white noise") in a band of interest, such noise was used for testing radio receivers, servo systems and occasionally in analog computing as a random value source
6D6 (U6A base), 6U7-G (Octal base) – Dual-control, remote-cutoff RF pentode used as an IF amplifier or as a mixer, also used in test equipment, control grid on top cap, 300 mA heater; derived from type 58, which had a 2.5 volt heater; similar to types 78, 6K7 and 6SK7 (control grid on pin 4)
6D7 – Sharp-cutoff pentode; 6C6, 6J7-G/EF37 with U7A base with shield on pin 5 and control grid on top cap
6D8-G – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, used in pre-war 6-volt farm radios, 150 mA heater, Octal base; similar to 6A8
6D10 – Compactron Triple high-μ triode used as oscillator, mixer, amplifier or AFCreactance[87] tube, 450 mA heater
6E5 – Top-view, "Magic Eye"-type tuning indicator, U6A base; 6G5/6U5 with a sharp-cutoff driver triode; 2E5 with a 6.3 V/300 mA heater
6E5-M – Top-view, "Magic Eye"-type tuning indicator, 150 mA heater, Miniature 7-pin base; similar to Japanese 6M-E5
6E6 – 1.6 Woutput Dual power triode used in car radios, μ = 6, 600 mA heater, U7A base
6E7 – Remote-cutoff pentode, 300 mA heater; 6D6, 6U7-G with U7A base with shield on pin 5 and control grid on top cap
6E8-G – Triode/hexode oscillator/mixer, 300 mA heater, Octal base with hexode control grid #1 on top cap
6F4 – 1.2 GHz Acorn UHF triode used as an oscillator, 225 mA heater
6F5, 6F5-G, 6F5-GT – High-μ triode, 300 mA heater, Octal base with control grid on top cap, equal to triode section of 6Q7
6F6 (Metal envelope), 6F6-G (Shouldered Tube glass envelope; M-OV/GEC KT63), 6F6-GT (Glass Tubular envelope) – 11 W AF Power pentode, 700 mA heater, Octal base, sometimes used as a transformer-coupled audio driver for 6L6-GC and 807 when those tubes were used in Class-AB2 or Class-B amplifiers, also used as a Class-C oscillator/amplifier in transmitters; type 42 with an Octal base
6F7 (U7A base), 6P7-G (Octal base) – Common cathode, medium-μ triode + remote-cutoff pentode used as triode/pentode oscillator/mixer, or as combination IF amplifier (pentode) and AM detector or AF amplifier (triode), 300 mA heater, U7A base with the pentode control grid on top cap
6F8-G – Dual medium-μ triode, 600 mA heater, Octal base with one control grid on top cap; two 6J5 in one envelope
6G5/6U5 (U6A base), 6G5-G/6U5-G (Octal base) – Top-view, "Magic Eye"-type tuning indicator; 6E5 with a remote-cutoff driver triode; 2G5 with a 6.3 V/300 mA heater
6G6-G – 2.75 W Power pentode used in pre-war 6-volt farm radios, 150 mA heater, Octal base; Miniature 7-pin version: 6AK6
6G8-G – Dual diode + remote-cutoff pentode used as detector and first AF amplifier in Australian 1940s radios, 300 mA heater, Octal base with control grid on top cap
6G11 – Compactron Dual-control, sharp-cutoff pentode + 6.5-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 1.2 A heater
6H4-GT – 100 V/4mA Diode, 150 mA heater, 5-pin Octal base
6H5 – Top-view, "Magic Eye"-type tuning indicator, 300 mA heater, U6A base; 6G5/6U5 with an extra grid tied to the cathode and a fixed 90° shadow oppopsite the controllable one
6H6 = 6Х6С↦6H6S ("Stubby" metal envelope), 6H6-G, 6H6-GT (Glass envelope) – Dual diode, 300 mA heater, Octal base; similar to EB34, M-OV/GEC D63, RFT HF/OSW3109
6H7S – Triode + 3.4 Woutput power pentode with a metal particles spray-shielded envelope, 500 mA heater, U7A base with triode control grid on top cap
6H8-G – Common cathode dual diode + pentode, 300 mA heater, Octal base with control grid on top cap
6J4/EC98 = 6С2П↦6S2P – UHF triode used in grounded-grid amplifiers, 400 mA heater, Miniature 7-pin base; ruggedized version: 6J4-WA/8532
6J5 (Metal envelope), 6J5-G (Shouldered Tube glass envelope), 6J5-GT = 6С2С↦6S2S (Glass Tubular envelope), 6J5-GTX (Ceramic base) – Medium-μ triode; 12J5-GT with a 6.3 V/300 mA heater; similar to M-OV/GEC L63; avionics version: 6J5-WGT
6J6/ECC91 – 600 MHz Dual VHF triode with common cathode, μ = 38, 450 mA heater, Miniature 7-pin base; ruggedized versions: 6J6-W, 6J6-WA, 6J6L/6927, 6030
6J8-G, 6J8-GA – Triode/heptode oscillator/mixer, 300 mA heater, Octal base with heptode control grid #1 on top cap
6J9 – Triple VHF triode used as Autodyne mixer in FM tuners, 450 mA heater, B10G Decar base (=Noval plus center pin 10 for cathodes 1 and 2)
6J10/6Z10 – Compactron Dual-control pentode + 10-watts power pentode used as FM quadrature demodulator and AF power amplifier, 950 mA heater; similar to 6AD10
6J11 – Compactron Dual sharp-cutoff IF pentode, 800 mA heater
6K5-G, 6K5-GT – High-μ triode, 300 mA heater, 7-pin Octal base with grid on top cap
6K6-G, 6K6-GT – 8.5 W Power pentode, 400 mA heater; type 41 with an Octal base
—Single-ended Class-A circuit: 0.35 to 4.5 watts
—Push-pull Class-A circuit: 10.5 watts max.
6K7, 6K7-G/PF9 (EF39), 6K7-GT, 6K7-GTX (Ceramic base) – Dual-control, remote-cutoff RF pentode, 300 mA heater, 7-pin Octal base with control grid on top cap. Most common commercial uses were as an IF amplifier or as a superheterodyne mixer. Also used in test equipment; type 78 with an Octal base, later 6SK7 (control grid on pin 4)
6K8, 6K8-G, 6K8-GT, 6K8-GTX (Ceramic base) – Triode/hexode oscillator/mixer introduced in 1938, Octal base with hexode control grid #1 on top cap; 12K8 with a 6.3 V/300 mA heater
6K11/6Q11 – Compactron 2× High-μ + 1× medium-μ triple triode used as a combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, 600 mA heater
6L4 – Acorn UHF triode used as an oscillator, 225 mA heater
6L5-G – Medium-μ triode available only in ST envelope, 150 mA heater, 6-pin Octal base; similar to 6J5-G
6L6 (Metal envelope), 6L6-G (Shouldered Tube glass envelope; EL37), 6L6-GT* (Glass Tubular envelope) – AF Beam power tetrodes, 900 mA heater, Octal base The original types 6L6 and 25L6 were derived from the M-OV/GEC N40 and introduced in April 1936 as the first American-made, commercially available beam power tetrodes. Both types were branded with the L6 ending to signify their (then) uniqueness among audio output tubes. However, this is the only similarity between the two tubes (6W6-GT is the 6.3 volt heater version of 12L6-GT, 25L6-GT and 50L6-GT).There are variants with e.g. thicker and/or ultra-black coated anode sheets, grids of larger diameter wire and/or with cooling fins; all variants up to revision A have the same maximum output ratings:
—Single-ended Class-A circuit: 11.5 watts
—Push-pull Class-A circuit: 14.5 watts
—Push-pull Class-AB1 circuit: 34 watts
—Push-pull Class-AB2 circuit: 60 watts
6L6-GA – Post-war version of 6L6-G, smaller Shouldered Tube ST-14 shaped envelope
6L6-GAY – 6L6-GA with a Micanol base for improved RF performance
6L6-WGA/5932 – Ruggedized version of 6L6-GA
6L6-GB – Post-war upgraded version in a cylindrical glass envelope; similar to 5881
6L6-GTB – 6L6 with a Glass Tubular envelope and a higher power rating; the 6L6-GTB can always replace the 6L6, 6L6-G, and 6L6-GT, but a 6L6-GTB running at maximum rating should not be replaced with a lower subvariant
6L6-WGB – Ruggedized version of 6L6-GB
6L6-GC – Final and highest-powered audio version of the tube. Max. output ratings:
—Single-ended Class-A circuit: 17.5 watts
—Push-pull Class-A circuit: 32 watts
—Push-pull Class-AB1 circuit: 55 watts
—Push-pull Class-AB2 circuit: 60 watts
6L6-GX – Class-C oscillator/amplifier used in transmitters, low loss ceramic base for improved RF performance, max. output 30 watts
6L7, 6L7-G – Remote-cutoff heptode pentagrid converter with American grid topology but control (#1) grid on top cap (requiring a separate oscillator – usually 6C5 – on the #3 grid), popular in late 1930s console radios, 300 mA heater, Octal base. Because of low conversion transconductance, radios using 6L7 typically have at least two IF amplifiers and/or a tuned RF pre-amplifier
6M3 – CRT horizontal deflection output booster/damper/efficiency diode, 3 A heater, Octal base with cathode on top cap
6M5/EL80 – 9 W AF power pentode used as Class-A or AB output amplifiers of 1950s Australian radiograms, 710 mA heater, Noval base; similar to 6BQ5/EL84
6M6-G – 4.4 Woutput Power pentode, 1.2 A heater, Octal base
6M7-G – Remote-cutoff RF pentode with a metal particles spray-shielded envelope, 300 mA heater, Octal base with control grid on top cap
6M8-GT – Common cathode diode + AF triode + RF/IF pentode, 600 mA heater, Octal base with pentode control grid on top cap
6M11 – Compactron Dual triode + IF pentode, 750 mA heater
6N3/EY82 – 850 V, 360 mA Half-wave rectifier, 900 mA heater, Noval base
6N4 – UHF Triode, 200 mA heater, Miniature 7-pin base
6N7, 6N7-G, 6N7-GT = 6Н7С↦6N7S – 2×5.5 W Dual power triode used as Class-A audio driver or as Class-B power output, μ = 35, 800 mA heater, max. output (Class-B): 10 watts; 6A6 with an Octal base
6N8/EBF80 – Dual diode + remote-cutoff pentode used as detector plus RF or AF amplifier in radios, 300 mA heater, Noval base
6P5-G/GT – Medium-μ triode, μ = 13.8, 300 mA heater, often used as cathode follower driver for the 6AC5-G zero bias power triode; type 76 with an Octal base
6P6 – 10 W Dual-control RF power pentode for use with suppressor grid modulation, 700 mA heater, U6A base with anode on top cap
6P8-G – Triode/hexode oscillator/mixer, 800 mA heater, Octal base with hexode control grid #1 on top cap
6Q4/EC80 – VHF Triode, 430 mA heater, Noval base
6Q5-G = 884 – 300 V, 1 mAavg, 300 mApeak Gas-filled triode thyratron, negative control characteristic, used in DuMont oscilloscopes as a sweep generator; 2B4 = 885 with a 6.3 V/600 mA heater and an Octal base
6Q6-G – Diode + triode, 150 mA heater, Octal base with grid on top cap
6Q7, 6Q7-G, 6Q7-GT – Common cathode dual diode + high-μ AF triode, μ = 70, 300 mA heater, Octal base with control grid on top cap
6R3/EY81 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, 810 mA heater, Noval base with cathode on top cap
6R4/EC81 – UHF oscillator triode, 175 mA heater, Noval base
6R6-G – Remote-cutoff pentode, 300 mA heater, Octal base with control grid on top cap
6R7, 6R7-G, 6R7-GT – Dual diode + medium-μ triode, μ = 16, 300 mA heater, Octal base with control grid on top cap; Miniature 7-pin version: 6BF6
6R8 – Triple diode + low-μ triode used as AM/FM demodulator and AF amplifier, 450 mA heater, Noval base
6S2/EY86 – 22 kV, 800 µA Half-indirectly heated CRT EHT rectifier, Noval base with anode on top cap; 1S2/DY86 with a 6.3 V/90 mA heater
6S2A/EY87 – 6S2/EY86 variant for operation at high altitudes with a silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions; 1S2A/DY87 with a 6.3 V/90 mA heater
6S4, 6S4A – Medium-μ triode used as CRT vertical deflection amplifier, 600 mA heater, Noval base
6S5 – Tuning indicator, 300 mA heater, U6A base
6S6-GT – Remote-cutoff RF pentode, 450 mA heater, 7-pin Octal base with control grid on top cap
6S7, 6S7-G – Remote-cutoff RF pentode used in pre-war 6-volt farm radios, 150 mA heater, Octal base with control grid on top cap; similar to 6D6, 6K7
6S8-GT – Triple diode + high-μ triode sharing a cathode with two of the diodes, used as a combined AM detector/AVC rectifier/FM ratio detector/AF amplifier in AM/FM radios, 300 mA heater, Octal base with triode grid on top cap. Typically, all sections of this tube are arranged around a single heater
6T4 – Low-μ triode used as UHF oscillator, 225 mA heater, Miniature 7-pin base
6T5 – Top-view, "Magic Eye"-type tuning indicator with a remote-cutoff driver triode, 300 mA heater, U6A base; 6G5/6U5 with a ring-shaped indicating area that varies its inner diameter with the signal strength
6T6-GM – RF Pentode, 450 mA heater, Octal base with control grid on top cap
6T7-G – Dual diode + high-μ triode used in pre-war farm radios, 150 mA heater, Octal base with control grid on top cap; similar to 6Q7
6T8, 6T8A – Triple diode + high-μ triode on common cathode with two of the diodes used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in North American AM/FM radios, triode μ = 70, 450 mA heater, Noval base; 6AK8/EABC80 with a shorter glass envelope
6T9 – Compactron Triode + 12-watts power pentode, 930 mA heater
6T10 – Compactron Dual-control, sharp-cutoff pentode + 10-watts power pentode used as FM quadrature demodulator and AF power amplifier, 950 mA heater
6TE8-GT – Triode/hexode oscillator/mixer, 300 mA heater, Octal base
6U3/EY80 – CRT horizontal deflection output booster/damper/efficiency diode, 900 mA heater, Noval base
6U4-GT – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, 5-pin Octal base
6U8/ECF82, 6U8A/6KD8 – VHF Triode/pentode oscillator/mixer also used as audio preamplifier, 450 mA heater, Noval base
6U9/ECF201 – Triode + remote-cutoff pentode used as CRT vertical deflection oscillator or combined sync sep/clipper/amplifier/phase detector, and video-IF amplifier, Decal base; 5U9/LCF201 or 8U9/PCF201 with a 6.3 V/410 mA heater
6V3, 6V3A – CRT horizontal deflection output booster/damper/efficiency diode, 1.75 A heater, Noval base with cathode on top cap
6V4/EZ80 – 1 kV, 2×45 mA Full-wave rectifier, 600 mA heater, Noval base
6V5-GT – 12 W Beam power tetrode, half-indirect 450 mA heater, Octal base
6V6 (Metal envelope), 6V6-G (Shouldered Tube glass envelope), 6V6-GT, 6V6-GTA (Glass Tubular envelope) – 12 W Beam power tetrode used in single-ended Class-A audio output amplifiers of radios and sometimes seen in Class-B audio amplifiers; 5V6 or 12V6 with a 6.3 V/450 mA heater; electrically similar to 6AQ5/EL90; ruggedized version: 6V6S
6V7-G – Dual diode + medium-μ triode, μ = 8.3, 300 mA heater; similar to 6R7-G; type 85 with an Octal base and grid on top cap
6W2 – Subminiature CRT EHT rectifier, anode on top wire, half-indirect 80 mA heater
6W4-GT, 6W4-GTA – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, 5-pin Octal base
6W5-G – Full-wave rectifier, 900 mA heater, 6-pin Octal base
6W6-GT – 10 W Beam power pentode used as CRT vertical deflection amplifier in 1950s monochrome TV receivers or as an audio output tube; 12L6-GT or 25L6-GT or 50L6-GT with a 6.3 V/1.2 A heater
6W7-G – Pentode, 150 mA heater, 7-pin Octal base with control grid on top cap
6X2/EY51 – 17 kV, 3 mA CRT EHT rectifier, half-indirect 90 mA heater, wire-ended
6X4/6BX4/EZ90 = 6Ц4П↦6C4P (Miniature 7-pin base) and 6X5/EZ35, 6X5-G, 6X5-GT (6-pin Octal base) – 1.25 kV, 2×210 mA Full-wave rectifiers, 600 mA heater; derived from type 84/6Z4; ruggedized versions: 6X4-W, 6X4-WA, 6X4-WS, 6X5-WGT
6X6-G – Tuning indicator, 300 mA heater, Octal base
6X8, 6X8A – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6X9/ECF200 – Triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and audio-IF or video amplifier, 410 mA heater, Decal base
6Y3-G – 5 kV CRT EHT rectifier, half-indirect 700 mA heater, Octal base
6Y5 – Full-wave rectifier, 800 mA heater; similar to type 84/6Z4, but with U6A base with shield on pin 2
6Y6-G, 6Y6-GA, 6Y6-GT – 12.5 W AF Beam power pentode, 1.25 A heater, 7-pin Octal base
6Y7-G – 11.5 W Dual power triode, 600 mA heater; 79 with an Octal base
6Y9/EFL200 – Pentode + 5-watts power pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode driver, 800 mA heater, Decal base
6Y10 – Compactron Dual-control, sharp-cutoff pentode + 4.8-watts power pentode used as FM quadrature demodulator and AF power amplifier, 830 mA heater
6AB4/6664/EC92 – High-μ triode, single ECC81/12AT7 system, 150 mA heater, Miniature 7-pin base
6AB5/6N5 – Top-view, "Magic Eye"-type tuning indicator with a sharp-cutoff driver triode, 150 mA heater, U6A base
6AB6-G – Triple-Twin AF signal + 8-watts zero bias power triode internally connected as a cathode follower, μ = 72, 500 mA heater, U6A base; low-power variant of the 6B5 used in car radios
6AB7 = RCA 1853 – Semiremote-cutoff RF/IF pentode, 450 mA heater, Octal base
6AB8/ECL80 – Triode + 3.5-watts power pentode, 300 mA heater, Noval base
6AB9 – Dual VHF tetrode, 365 mA heater, Decal base
6AC5-G = CV844 – 10 W Zero bias high-μ power triode designed for operation with positive grid bias up to +13 V supplied from a cathode follower driver triode such as 76, 6J5, 6P5, or half a 6AE7, μ = 125, 400 mA heater, Octal base; cf. 295, 2B6, 6AC6, 6B5, 6N6-GTriple-TwinDarlington triodes
6AC6-G, 6AC6-GT – Triple-Twin AF signal + zero bias power triode with a common, single anode, internally connected as a cathode follower, μ = 54, 1.1 A heater, Octal base
6AC7 = RCA 1852 (6AC7-W) – Sharp-cutoff RF pentode used in analog TV receivers, 450 mA heater, Octal base; not to be confused with the 6CA7/EL34
6AC9 – Compactron Dual diode + pentode used as IF amplifier and phase detector, 600 mA heater
6AD5-G – High-μ triode used as driver for electrostatic CRT deflection plates, 300 mA heater, Octal base
6AD6-G (100 to 150 V target for AC/DC radios), 6AF6-G (250 V target for larger AC radios) – Top-view, driverless "Magic Eye"-type tuning indicators with two independent "pie wedge" shadow indicators on opposite sides of a single circular target, a 150 mA heater and an Octal baseBoth shadows may be used in tandem or may be driven by two different signal sources. Type 6AE6-G is specifically made to drive 6AD6-G and 6AF6-G, but they may also be driven by a sharp-cutoff pentode like a 6J7-G/EF37 (highly sensitive to weak signals) for one shadow and a remote-cutoff pentode like a 6K7-G/PF9 (reacting only to stronger signals) for the other
6AD7-G – Triode + 8.5-watts power pentode, 850 mA heater, Octal base
6AD8/EBF81 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, 300 mA heater, Noval base
6AE5-G, 6AE5-GT – Low-μ triode, 300 mA heater, 6-pin Octal base
6AE6-G – Split-anode driver triode for tuning indicators 6AD6-G and 6AF6-G, 150 mA heater, common cathode, common grid with a high-μ section for one anode and a vari-μ section for the other. The high-μ grid reacts to weak signals while the vari-μ grid reacts only to stronger signals
6AE7-GT – Common-anode, separate cathodes dual triode used as a cathode follower driver for two push-pull zero bias power triodes such as 6AC5, μ = 14, 500 mA heater; cf. 295, 2B6, 6AC6, 6B5, 6N6-GTriple-Twin Darlington triodes
6AE8 – Triode/hexode oscillator/mixer, 300 mA heater, Noval base
6AF3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Noval base with cathode on top cap
6AF4/EC94, 6AF4A/6DZ4 – Medium-μ UHF oscillator triode used in analog TV tuners and set-top converters, 225 mA heater, Miniature 7-pin base
6AF5-G – Triode, 300 mA heater, 6-pin Octal base
6AF7-G – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 300 mA heater, Octal base
6AF9 – Dual dissimilar pentode used as sound IF amplifier or combined sync sep/clipper/amplifier/phase detector or phase inverter/splitter/comparator or gated AGC DC voltage amplifier/keyer/noise inverter, and CRT cathode driver, 850 mA heater, Decal base
6AG6-G – 10 W Power pentode, 1.2 A heater, Octal base
6AG7/6AK7 – 9 W Power pentode used as CRT cathode driver, 650 mA heater, Octal base
6AG9 – Compactron Medium-μ triode + frame-grid pentode used as gated AGC amplifier/keyer/noise inverter, and video amplifier in analog color TV receivers, 820 mA heater
6AH4-GT – Medium-μ triode, 750 mA heater, 6-pin Octal base
6AH5-G – 18.5 W Beam power tetrode for early TV use in some Philco receivers, 900 mA heater, Octal base; 6L6-G with a different pinout
6AH6, 6AH6S (external shield tied to cathode) – Wideband, sharp-cutoff IF pentode, 450 mA heater, Miniature 7-pin base; avionics version: 6AH6-WA
6AH7-GT – Dual triode, 300 mA heater, Octal base
6AH9 – Compactron Medium-μ triode + sharp-cutoff frame-grid pentode used as video amplifier and color blanker in analog color TV receivers, 900 mA heater
6AJ4/EC84 – High-μ triode, 225 mA heater, Noval base
6AJ5 (7755, 414A) – Low (6.3-80 V) anode voltage, sharp-cutoff pentode, 175 mA heater, Miniature 7-pin base
6AJ7 – Pentode, 450 mA heater, Octal base
6AJ8/ECH81 – Triode/remote-cutoff heptode oscillator/mixer, 300 mA heater, Noval base
6AK5/EF95/6069 = 6Ж1П↦6J1P – 400 MHz Sharp-cutoff pentode used in old Radiosonde weather balloon transmitters, receiver front ends and contemporary audio equipment, 175 mA heater, Miniature 7-pin base; avionics versions: 6AK5-W/5654/6096/E95F, 6028/408A, CV4010
6AK6 – 2.75 W Power pentode, unusual low-power consumption output tube with 150 mA heater; 6G6-G with a Miniature 7-pin base; ruggedized version: 6AK6S
6AK8/EABC80 – Triple diode + high-μ triode on common cathode with two of the diodes used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in AM/FM radios manufactured outside of North America, 450 mA heater, Noval base, triode μ = 70; 6T8 with a longer glass envelope
6AK9 – Compactron high-μ triode + medium-μ triode + 10-watts beam power pentode, 1.6 A heater
6AK10 – Compactron Triple high-μ triode used as NTSC chroma signal demodulator matrix in analog color TV receivers, 900 mA heater
6AL3/EY88 = 6Д20П↦6D20P – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, 1.55 A heater, Noval base with cathode on top cap
6AL5/EAA91 = M-OV/GEC D77 = 6Х2П↦6H2P – Dual diode with separate cathodes used as detector, also in vacuum tube volt meters; 6H6 with a Miniature 7-pin base; 12AL5/HAA91, UAA91 or 3AL5/XAA91 with a 6.3 V/300 mA heater; avionics versions: 6AL5-W/5726/6097/E91AA
6AL6-G – 18.5 W Beam power tetrode for early TV use, 900 mA heater, Octal base; 6L6-G with a different pinout and anode on top cap
6AL7-GT – Top-view, driverless, triple (independently controllable) bar graph-type tuning/level indicator used in many early AM/FM Hi-Fi radios, 150 mA heater, Octal base
6AL11 – Compactron Dual-control, sharp-cutoff pentode + 10-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 900 mA heater
6AM4 – High-μ UHF triode used as grounded-grid amplifier, 225 mA heater, Noval base
6AM5/EL91 – 4 W Power pentode, 200 mA heater, Miniature 7-pin base
6AM6/EF91 = M-OV/GEC Z77 (M8083) – Sharp-cutoff RF pentode used in receiver front ends and test gear such as VTVMs and TV broadcast modulation monitors, 300 mA heater, Miniature 7-pin base; ruggedized version: 6AM6S
6AM8, 6AM8A – Diode + sharp-cutoff pentode used as video detector and IF amplifier, 450 mA heater, Noval base
6AN4 – High-μ triode used as UHF mixer or amplifier, 225 mA heater, Miniature 7-pin base
6AN8, 6AN8A – Triode + pentode used as combined sync sep/clipper/amplifier/phase detector or phase inverter/splitter/comparator or gated AGC amplifier/keyer/noise inverter, and reactance tube or IF amplifier, 450 mA heater, Noval base
6AQ4/EC91 – 250 MHz VHF triode, 300 mA heater, Miniature 7-pin base
6AQ5/EL90, 6AQ5A/6669 (12 W, tolerant to vehicle heater voltage fluctuations), 6BM5 (9 W), 6HG5 (12 W), 6HR5 – Beam power pentodes used as CRT vertical deflection or audio power amplifier, 450 mA heater; 6CM6 = 6П1П↦6P1P with a Miniature 7-pin base; similar to 6V6; ruggedized versions: 6AQ5L/6928 (long-life), 6AQ5-W/6005
6AQ6 – Dual diode + high-μ AF triode, 150 mA heater, Miniature 7-pin base
6AQ7-GT – Dual diode + high-μ triode, 300 mA heater, Octal base
6AQ8/ECC85 – 200 MHz Dual RF/VHF triode used as oscillator/mixer (the heater to cathode insulation is inadequate for use in cascode operation) in FM receivers, separate cathodes, internal shield between the two sections, μ = 57, 435 mA heater, Noval base; similar to 6BK7, 6BQ7, 6BZ7
6AR5 – 8.5 W Power pentode, 400 mA heater, Miniature 7-pin base
6AR6 – 19 W Beam power pentode, 1.2 A heater, 6-pin Octal base; avionics versions: 6AR6-WA/6098, 6384
6AR7-GT – Dual diode + remote-cutoff pentode, 300 mA heater, Octal base
6AR11 – Compactron Semiremote-cutoff dual IF pentode, 800 mA heater
6AS5 – 5.5 W AF Beam power pentode, 800 mA heater, Miniature 7-pin base
6AS6 = Western Electric 409A = 6Ж2П↦6J2P – Dual-control pentode used e.g. in radar phantastron circuits, 175 mA heater, Miniature 7-pin base; similar to EF80; avionics version: 6AS6-W/5725/6187
6AS7 = 6Н5С↦6N5S, 6AS7-G/ECC230 = 6Н13С↦6N13S (6080), 6AS7-GYB (Micanol base) – 13 W Dual low impedance, low-μ triode designed as series-pass regulator in stabilized DC power supplies, μ = 2, 2.5 A heater, Octal base
6AS8 – High-perveance diode + sharp-cutoff pentode used as audio/video detector or gated AGC amplifier/keyer/noise inverter or DC restorer and IF or video amplifier, 450 mA heater, Noval base
6AU8, 6AU8A – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector and IF or video amplifier, 600 mA heater, Noval base
6AV4/EZ91 – 1 kV, 2×45 mA Full-wave rectifier, 950 mA heater, Miniature 7-pin base
6AV5-GA, 6AV5-GT – 11 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, Octal base
6AV6/EBC91 – Common cathode dual diode + high-μ AF triode used in FM ratio detectors, triode μ = 100 (triode section similar in characteristics to one half of a 12AX7/ECC83), 300 mA heater; type 75 with a Miniature 7-pin base
6AV11 – Compactron Triple medium-μ triode, 600 mA heater
6AW7-GT – Dual diode + triode, 300 mA heater, Octal base
6AW8, 6AW8A – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector and video amplifier, 600 mA heater, Noval base
6AX4, 6AX4-GTA, 6AX4-GTB – 4.4 kV, 137 mA CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, 6-pin Octal base
6AX5 – 1.25 kV, 2×375 mA Full-wave rectifier, 1.2 A heater, Octal base; similar in structure to 6X5, but with higher voltage and current ratings which are comparable to those of 5Y3 and 80
6AX6-G – Dual rectifier with separate cathodes, 2.5 A heater, 7-pin Octal base
6AX8 – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector and video amplifier, 450 mA heater, Noval base
6AY3, 6AY3A, 6AY3B – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Novar base
6AY11 – Compactron Dual diode + dual high-μ triode used as FM demodulator and AF amplifier, 690 mA heater
6AZ5 – Subminiature dual diode, separate cathodes, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
6AZ6 – Subminiature, ruggedized, dual UHF diode with separate cathodes, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
6AZ8 – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or phase inverter/splitter/comparator or gated AGC amplifier/keyer/noise inverter and IF or video amplifier, 450 mA heater, Noval base
6BA3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Novar base
6BA8, 6BA8A – Medium-μ triode + sharp-cutoff pentode with controlled anode knee characteristic, used as combined sync sep/clipper/amplifier/phase detector and video amplifier, 600 mA heater, Noval base
6BA11 – Compactron Triode + split-anode pentode used as CRT vertical deflection oscillator and combined sync sep/clipper/amplifier/phase detector, 600 mA heater
6BC4 – Medium-μ RF triode, 225 mA heater, Noval base
6BC5/6CE5 – 400 MHz Semiremote-cutoff VHF pentode, 300 mA heater, Miniature 7-pin base; 6AG5/EF96 with a higher μ
6BC7 – Separate cathodes triple diode, 450 mA heater, Noval base
6BC8 – Dual semiremote-cutoff VHF triode used as cascode amplifier, 400 mA heater, Noval base
6BD4 (20 kV, 20 W), 6BD4A (27 kV, 25 W) – 1.5 mA Beam power triode used as EHV shunt regulator in analog color TV receivers, μ = 1650, 500 mA heater, 6-pin Octal base with anode on top cap
6BD5-GT – 10 W Beam power pentode used as CRT horizontal deflection amplifier, 900 mA heater, 6-pin Octal base
6BD6 – Remote-cutoff RF/IF pentode, 300 mA heater, Miniature 7-pin base
6BD7/EBC80 – Shielded dual diode + AF triode, 230 mA heater, Noval base
6BE6/EK90 = M-OV/GEC X727 = 6А2П↦6A2P (5750) – Remote-cutoff heptode pentagrid converter with American grid topology, 300 mA heater, Miniature 7-pin base, popular in car radios
6BE8, 6BE8A – VHF Medium-μ triode/sharp-cutoff pentode oscillator/mixer, 450 mA heater, Noval base
6BF5 – 5.5 W Beam power tetrode, 1.2 A heater, Miniature 7-pin base
6BF6 – Dual diode + medium-μ triode, 300 mA heater; 6R7 with a Miniature 7-pin base
6BF7, 6BF7A (6021/ECC70) – Subminiature, separate cathodes dual triode, 300 mA heater, all-glass round cross-section envelope with 8 long inline wire-ends
6BF8 – Sextuple diode with a common cathode, 450 mA heater, Noval base
6BF11 – Compactron Dual-control, sharp-cutoff pentode + 6.5-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 1.2 A heater
6BG6 (ST envelope), 6BG6-GA (GT) – 20 W Beam power pentode used in early TV magnetic-deflection horizontal-output amplifiers, 900 mA heater, Octal base; 6L6-G with the anode on top cap
6BH3, 6BH3A – CRT horizontal deflection output booster/damper/efficiency diode, 1.6 A heater, Novar base
6BH5/EF81 – Remote-cutoff RF/IF/video pentode, 200 mA heater, Noval base
6BH6 (7693/E90F, 6265) – Sharp-cutoff RF pentode, 150 mA heater, Miniature 7-pin base
6BH8 – Medium-μ triode + sharp-cutoff pentode used as CRT vertical deflection oscillator or combined sync sep/clipper/amplifier/phase detector, and IF or video amplifier, 600 mA heater, Noval base; 6AU8 with a lower-μ triode
6BJ5 – 9 W Power pentode, 200 mA heater, Miniature 7-pin base
6BJ6, 6BJ6A – Remote-cutoff RF/IF pentode, 150 mA heater, Miniature 7-pin base
6BJ7 – Triple diode used as DC restorer in analog color TV receivers, 450 mA heater, Noval base
6BJ8 – Dual diode + medium-μ triode used as phase inverter/splitter/comparator and CRT vertical deflection amplifier, 600 mA heater, Noval base
6BK4 = 6С20С↦6S20S – 27 kV, 25 W, 1.5 mA Beam power triode used as EHV shunt regulator in analog color TV receivers and in measurement equipment such as high voltage meters, μ = 2000, 200 mA heater, Uh-c=-200 V, Octal base with anode on top cap
6BK5 – 9 W Beam power pentode, 1.2 A heater, Noval base
6BK6 – Common cathode dual diode + high-μ AF triode used as detector and AF amplifier, Miniature 7-pin base; 12BK6 or 26BK6 with a 6.3 V/300 mA heater
6BK7, 6BK7A, 6BK7B – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections, 450 mA heater; similar to 6AQ8/ECC85, 6BQ7, 6BZ7
6BM6 – 150 mW, 0.55-3.8 GHz Reflex Klystron, 650 mA heater, 4-pin PeeWee base with external-cavity contact rings and top cap; CW-only variant of 6BM6A/5837
6BM8/ECL82 = 6Ф3П↦6F3P – Triode + pentode used as CRT vertical deflection or AF amplifier and has even been seen in an electronic nerve stimulator, 780 mA heater, Noval base
6BN4, 6BN4A – Medium-μ VHF triode, 200 mA heater, Miniature 7-pin base
6BN5/EL85 – 6 W, 120 MHz RF/AF power pentode, 200 mA heater, Noval base
6BN6/6KS6 = 6А3П↦6A3P – Gated-beam discriminator pentode used in radar, dual channel oscilloscopes and FM quadrature demodulators where the suppressor grid is connected to ground via an LC tank circuit tuned for a 90° phase lag to the IF at center frequency, Miniature 7-pin base;[88][89] precursor of the Nonode approach; 3BN6, 4BN6, 12BN6 with a 6.3 V/300 mA heater
6BN7 – Dual triode used as CRT vertical deflection oscillator+amplifier, 750 mA heater, Noval base
6BN8 – Dual diode + high-μ triode used as phase/ratio discriminator, AF/burst amplifier or oscillator, 600 mA heater, Noval base
6BN11 – Compactron Dual sharp-cutoff IF pentode, 800 mA heater
6BQ5/EL84 = M-OV/GEC N709 = 6П14П↦6P14P – 5.7 W AF power pentode, 760 mA heater, Noval base
6BQ6-G, 6BQ6-GA, 6BQ6-GT – 12 W Beam power pentode used as a horizontal deflection output tube in 1950s monochrome TV receivers with diagonal screen sizes less than 19 in (48 cm), however, may be found in some larger models which more often used similar type 6DQ6, 1.2 A heater, Octal base
6BQ6-GTB/6CU6 – Upgraded 6BQ6-GT
6BQ7 – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections, which can be used independently or in a cascode amplifier, 400 mA heater, Noval base; similar to 6AQ8/ECC85, 6BK7, 6BZ7
6BQ7A/ECC180 – Upgraded 6BQ7 capable of operation at UHF frequencies; similar to 6Н1П↦6N1P
6BR3 = 6RK19 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Noval base
6BR5/EM80 – Side-view, fan-type tuning indicator, 300 mA heater, Noval base
6BR7 (Control grid on base), 6BS7 (control grid on top cap) – Low-hum, low-microphonics AF pentode, 150 mA heater, Noval base
6BR8/6FV8, 6BR8A/6FV8A – Medium-μ triode + sharp-cutoff pentode used as CRT vertical deflection oscillator and IF amplifier, 450 mA heater, Noval base
6BS3, 6BS3A – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Novar base
6BS5 – 12.5 W Beam power tetrode used as AF or CRT cathode driver, or CRT vertical deflection amplifier, 750 mA heater, Noval base
6BS7 – See 6BR7
6BS8 – Medium-μ dual VHF triode used as cascode amplifier, 400 mA heater, Noval base
6BT4/EZ40 – 780 V, 2×45 mA Full-wave rectifier, 600 mA heater, Rimlock base
6BT6 – Dual diode + high-μ triode, 300 mA heater, Miniature 7-pin base
6BT8 – Dual diode + sharp-cutoff pentode used as gated AGC amplifier/keyer/noise inverter, or IF or video amplifier/detector, 450 mA heater, Noval base
6BU4 – 25 kV, 25 W, 1 mA Beam power triode used as EHV shunt regulator in analog color TV receivers, μ = 1515, 450 mA heater, Octal base with anode on top cap
6BU5 – 20 kV, 20 W, 1 mA Beam power pentode used as EHV shunt regulator in analog color TV receivers, 150 mA heater, Octal base with anode on top cap
6BU6 – Dual diode + triode, 300 mA heater, Miniature 7-pin base
6BU8/6GS8, 6BU8A, 6HS8, 6LE8, 6MK8 – Split-anode pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, 300 mA heater, Noval base
6BV7 – Dual diode + 10-watts power pentode, 800 mA heater, Noval base
6BV8 – Dual diode + triode, 600 mA heater, Noval base
6BV11 – Compactron Dual sharp-cutoff dual-dontrol pentode used as color demodulator, 900 mA heater
6BZ6 – Sharp-cutoff RF pentode used in 1960s video-IF circuits, 300 mA heater, Miniature 7-pin base
6BZ7 – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections, 400 mA heater, Noval base; similar to 6AQ8/ECC85, 6BK7, 6BQ7
6BZ8 – Dual medium-μ VHF triode, 400 mA heater, Noval base
6CA4/EZ81 – 1 kV, 2×450 mA Full-wave rectifier, 1 A heater, Noval base
6CA7/EL34 = 6П27С↦6P27S – 25 W AF power pentode, 1.5 A heater, Octal base
6CA11 – Compactron Dual high-μ triode + frame-grid, sharp-cutoff video pentode, 1.02 A heater
6CB5 (ST envelope, 23 W), 6CB5A (GT, 26 W) – Beam power pentode used as CRT horizontal deflection amplifier, 2.5 A heater, Octal base
6CB6, 6CB6A/6CF6/6676/EF190 – Sharp-cutoff RF pentode used in 1950s and early 1960s video-IF circuits, 300 mA heater, Miniature 7-pin base
6CD6-G (ST envelope, 15 W), 6CD6-GA (GT, 20 W) – Beam power pentode used as CRT horizontal deflection amplifier, 2.5 A heater, Octal base with anode on top cap
6CD7/EM34 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 200 mA heater, Octal base
6CG6 – Remote-cutoff pentode, 300 mA heater, Miniature 7-pin base
6CG7/6FQ7 (7026) – Dual triode used in analog TV receivers and some audio amplifiers including modern solid-state designs, often as a cathode follower, 600 mA heater; 6SN7 with a Noval base
6CG8, 6CG8A – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6CH3/6CJ3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.8 A heater, Novar base
6CH6/EL821 (6132) – 12 W Power pentode used as CRT cathode driver in high definition television equipment, 750 mA heater, Noval base
6CH7 – Medium-μ dual RF triode used as cascode amplifier, 400 mA heater, Noval base
6CH8 – Medium-μ triode + sharp-cutoff pentode, 450 mA heater, Noval base
6CJ3 – See 6CH3
6CJ5/EF41 – Remote-cutoff RF/IF pentode, 200 mA heater, Rimlock base
6CJ6/EL81 – 8 W Power pentode used as CRT horizontal deflection amplifier, 1.05 A heater, Noval base
6CK3/6CL3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Novar base
6CK4 – Low-μ triode used as CRT vertical deflection amplifier, 1.25 A heater, 6-pin Octal base
6CK5/EL41 – 9 W AF Power pentode, 700 mA heater, Rimlock base
6CK6/EL83 – 9 W Power pentode used as CRT cathode driver, 710 mA heater, Noval base
6CL3 – See 6CK3
6CL6 – 7.5 W Power pentode used as CRT cathode driver, 650 mA heater, Noval base
6CL8, 6CL8A – Medium-μ triode + sharp-cutoff VHF tetrode used as oscillator/mixer, 450 mA heater, Noval base
6CM3 – CRT horizontal deflection output booster/damper/efficiency diode, 2.4 A heater, Novar base
6CM4/EC86 – UHF triode, Noval base; 4CM4/PC86 with a 6.3 V/170 mA heater
6CM5/EL36 = 6П31С↦6P31S – 10 W Beam power tetrode used as AF or CRT horizontal deflection amplifier, 1.25 A heater, Octal base
6CM7 – Dual dissimilar (μ = 21 and 18) triode used as CRT vertical deflection oscillator+amplifier, 600 mA heater, Noval base
6CM8 – High-μ triode + sharp-cutoff pentode, 450 mA heater, Noval base
6CN6/EL38 – 25 W Power pentode used as CRT horizontal deflection amplifier, 1.4 A heater, Octal base
6CQ4/6DE4 – CRT horizontal deflection output booster/damper/efficiency diode, 1.6 A heater, Octal base
6CQ6/EF92 (6CQ6S) – Remote-cutoff RF pentode, 200 mA heater, Miniature 7-pin base
6CQ8 – Medium-μ triode + sharp-cutoff tetrode used as VHF oscillator/mixer, 450 mA heater, Noval base
6CR4 = M-OV/GEC A2521 – grounded-grid UHF triode used as cascode amplifier, 370 mA heater, Noval base
6CR5 – 11 W Beam power tetrode used as CRT horizontal deflection amplifier, 1.2 A heater, Noval base
6CR6 – Diode + remote-cutoff pentode, 300 mA heater, Miniature 7-pin base
6CR8, 6CS8 (Different pinout) – Triode + IF pentode, 450 mA heater, Noval base
6CS5 – 11 W AF Beam power pentode, 1.2 A heater, Noval base; similar to 6W6-GT
6CS6/EH90 – Sharp-cutoff heptode with American grid topology, used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, 300 mA heater, Miniature 7-pin base
6CS7 – Dual dissimilar (μ = 17 and 15.5) triode used as CRT vertical deflection oscillator+amplifier, or in tube audio amplifiers, 600 mA heater, Noval base
6CT3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Noval base
6CT7/EAF42 – Diode + remote-cutoff RF/IF/AF pentode, 200 mA heater, Rimlock base
6CU5 – 7 W AF Beam power pentode, 1.2 A heater, Miniature 7-pin base
6CU7/ECH42 – Triode/remote-cutoff hexode oscillator/mixer, 230 mA heater, Rimlock base
6CU8 – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and IF or video amplifier, 450 mA heater, Noval base
6CV7/EBC41 – Shielded common cathode dual diode + AF triode, 230 mA heater, Rimlock base
6CW5/EL86 – 12 W AF Beam power pentode, 760 mA heater, Noval base
6CX7 – Medium-μ dual triode, 400 mA heater, Noval base
6CX8 – Medium-μ triode + sharp-cutoff pentode used as CRT deflection oscillator or amplifier and video amplifier, 750 mA heater, Noval base
6CY5/7717 (6CY5/CATV) – Sharp-cutoff VHF tetrode, 200 mA heater, Miniature 7-pin base
6CY7 – Dual dissimilar (μ = 68 and 5.5) triode used as CRT vertical deflection oscillator+amplifier, 750 mA heater, Noval base
6CW4 – Nuvistor High-μ VHF triode, 135 mA heater, most common one in consumer electronics
6CZ5 (6973) – 10 W Beam power pentode used as CRT vertical deflection or audio amplifier, 450 mA heater, Noval base
6DA4/6DM4, 6DA4A/6DM4A – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, 5-pin Octal base
6DA5/EM81 – Tuning indicator, 300 mA heater, Noval base; 6BR5/EM80 with 25% greater sensitivity
6DA6/EF89 – RF Pentode used in AM/FM radios manufactured outside North America, 200 mA heater, Noval base
6DA7 – Dual dissimilar (μ = 20 and 6.3) triode used as CRT vertical deflection oscillator+amplifier, 1 A heater, Noval base
6DB5 – 10 W Beam power tetrode, 1.2 A heater, Noval base
6DC6 – Semiremote-cutoff pentode, 300 mA heater, Miniature 7-pin base
6DC8/EBF89 – Common cathode dual diode + semiremote-cutoff RF/IF pentode, 300 mA heater, Noval base
6DE6 – Sharp-cutoff IF pentode, 300 mA heater, Miniature 7-pin base
6DE7 – Dual dissimilar (μ = 17.5 and 6) triode used as CRT vertical deflection oscillator+amplifier, 900 mA heater, Noval base
6DG6-GT – 10 W AF Beam power pentode, 1.2 A heater, Octal base
6DG7 – Remote-cutoff RF/IF pentode, 300 mA heater, Noval base
6DH7/6FG6/EM84 = 6Е3П↦6Ye3P – Side-view, band-type tuning/level indicator, 270 mA heater, Noval base
6DJ8/ECC88 = 6Н23П↦6N23P = Shuguang6N11 (↤6Н11) – Dual VHF triode used as cascode amplifier in TV broadcast equipment, test gear, oscilloscopes and audiophile gear, μ = 33, 365 mA heater, Noval base; similar to 6ES8/ECC189, 6922/E88CC
6DK3 – CRT horizontal deflection output booster/damper/efficiency diode, 1.8 A heater, Novar base with cathode on top cap
6DK6 – Sharp-cutoff IF pentode, 300 mA heater, Miniature 7-pin base
6DL3 – CRT horizontal deflection output booster/damper/efficiency diode, 2.3 A heater, Novar base with cathode on top cap
6DL5/EL95 – 6 W AF Power pentode used in car radios, 200 mA heater, Miniature 7-pin base
6DL7 – Tuning indicator, 300 mA heater, Octal base
6DQ4 – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, 5-pin Octal base
6DQ5 – 24 W Beam power pentode used as CRT horizontal deflection amplifier, 2.5 A heater, Octal base
6DQ6A – 18 W Beam power pentode used as a horizontal deflection output tube in 1950s monochrome TV receivers, mostly those with diagonal screen sizes larger than 17 in (43 cm), 1.2 A heater, Octal base. Smaller receivers often used similar type 6BQ6-GT. Also used as audio output tubes in Standel guitar amplifiers
6DQ6B/6GW6 – 6DQ6 with higher ratings and a higher zero-bias anode current
6DR4 – High-μ triode, 150 mA heater, Miniature 7-pin base; similar to one section of 12AX7/ECC83
6DR6 – 8 W Power pentode, 1.05 A heater, Noval base
6DR7 – Dual dissimilar (μ = 64 and 6) triode used as CRT vertical deflection oscillator+amplifier, 900 mA heater, Noval base
6DR8/EBF83 – Common cathode dual diode + low (6.3-50 V) anode voltage pentode used as IF amplifier, detector and AGC diode in vehicle equipment, 300 mA heater, Noval base
6DS4 – Nuvistor Semiremote-cutoff VHF triode used in analog TV tuners immediately prior to the introduction of solid state tuning circuits (RCA TV receivers equipped with a 6DS4 tuner bore the trademark "Nu-Vista Vision"), 135 mA heater; successor of type 6CW4
6DS5 – 9 W AF Beam power pentode, 800 mA heater, Miniature 7-pin base
6DS8/ECH83 – Low (6.3-25 V) anode voltage, triode/sharp-cutoff heptode oscillator/mixer used in vehicle equipment, 300 mA heater, Noval base
6DV4 – Medium-μ Nuvistor triode for UHF oscillators, 135 mA heater; some variants had a Gold-plated envelope
6DW4, 6DW4A, 6DW4B – CRT horizontal deflection output booster/damper/efficiency diode, 1.2 A heater, Novar base
6DW5 – 11 W Power pentode used as CRT vertical deflection amplifier, 1.2 A heater, Noval base
6DX4 – UHF triode, 200 mA heater, Miniature 7-pin base
6DX8/ECL84 = 6Ф4П↦6F4P – Triode + 4-watts power pentode used as combined sync sep/clipper/amplifier/phase detector, and CRT cathode driver, 720 mA heater, Noval base
6DY4, 6DY4A – UHF frame-grid triode, 125 mA heater, Miniature 7-pin base
6DY5/EL82 – 9 W Power pentode used as CRT vertical deflection or AF amplifier, 800 mA heater, Noval base
6DY7 – 2×15 W Dual AF beam power pentode used in Stereo amplifiers, 1.2 A heater, Octal base
6DZ7 – 2×13.2 W Dual AF power pentode used in Hi-Fi Stereo amplifiers, 1.52 A heater, Octal base
6DZ8 – High-μ AF triode + 6.5-watts AF power pentode, 900 mA heater, Noval base
6EA4 – 27 kV, 30 W, 1.6 mA Compactron Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, anode on top cap
6EA5 – Sharp-cutoff tetrode, 200 mA heater, Miniature 7-pin base
6EA7 (6EM7) – Dual dissimilar (μ = 66 and 5.5) triode used as CRT vertical deflection oscillator+amplifier, 1.05 A heater, Octal base
6EA8 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6EB5 – Dual diode, 300 mA heater, Miniature 7-pin base
6EB8/6GN8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 750 mA heater, Noval base
6EC4/EY500 – CRT horizontal deflection output booster/damper/efficiency diode for analog color TV receivers, Magnoval base with cathode on top cap, guardian shield between filament and cathode to improve high voltage properties; 42EC4/PY500 with a 6.3 V/2.1 A heater
6EC4A/EY500A – 6EC4/EY500 without the guardian shield because of an improved filament/cathode insulation
6EC7 – Remote-cutoff RF pentode, 200 mA heater, Noval base
6EF4 – Compactron Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, anode on top cap
6EF6 – 10 W Compactron Beam power pentode used as CRT vertical deflection amplifier, 200 mA heater
6EH4A, 6EJ4A (With an arc-safety shield between grid and anode) – 27 kV, 40 W, 1.5 mA Compactron Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, anode on top cap
6EH5 – 5.5 W AF Beam power pentode, 1.2 A heater, Miniature 7-pin base
6EH7/EF183 – Frame-grid, remote-cutoff IF pentode, 300 mA heater, Noval base
6EH8 – Triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6EJ7/EF184 – Frame-grid, sharp-cutoff IF pentode, 300 mA heater, Noval base
6ES5 – High-μ VHF triode, 200 mA heater, Miniature 7-pin base
6ES6/EF97 = 6К8П↦6K8P (remote-cutoff), 6ET6/EF98 (sharp-cutoff) – Low (6.3-50 V) anode voltage RF pentodes used in car radios, 300 mA heater, Miniature 7-pin base
6ES8/ECC189 – Dual VHF triode used as cascode amplifier in analog TV tuners and receiver front ends, also used as general-purpose dual triode in test gear, 365 mA heater, Noval base; similar to 6DJ8/ECC88
6ET6/EF98 – Low (6.3-50 V) anode voltage, sharp-cutoff pentode used as oscillator or IF/AF amplifier in vehicle equipment, 300 mA heater, Miniature 7-pin base
6ET7 – Dual diode + sharp-cutoff pentode used as horizontal phase detector and video amplifier, 750 mA heater, Noval base
6EU7 – High-μ dual triode used as AF amplifier or phase inverter, 300 mA heater, Noval base
6EU8 – Medium-μ triode + sharp-cutoff pentode used as oscillator/mixer, 450 mA heater, Noval base
6EV5 – Sharp-cutoff VHF tetrode, 200 mA heater, Miniature 7-pin base
6EV7 – Dual triode, 600 mA heater, Noval base
6EW6 – Sharp-cutoff IF pentode, 400 mA heater, Miniature 7-pin base
6EW7 – Dual dissimilar (μ = 17.5 and 6) triode used as CRT vertical deflection oscillator+amplifier, 900 mA heater, Noval base
6EX6 – 22 W Beam power tetrode used as CRT horizontal deflection amplifier, 2.25 A heater, 6-pin Octal base
6EY6 – 11 W Beam power pentode used as CRT vertical deflection amplifier, 680 mA heater, 6-pin Octal base
6EZ5 – 12 W Beam power pentode used as CRT vertical deflection amplifier, 800 mA heater, Octal base
6EZ8 – Triple high-μ VHF triode used in FM tuners, 450 mA heater, Noval base, cathodes 1 and 2 and one side of the heater share pin 4
6FA7 – Diode + sharp-cutoff split-anode tetrode used as frequency divider or complex-wave generator, 300 mA heater, Noval base
6FC7/ECC89 – 220 MHz Dual frame-grid VHF triode used as cascode amplifier in analog TV tuners and receiver front ends, or as general-purpose instrumentation amplifier, 340 mA heater, Noval base
6FD7 – Dual dissimilar (μ = 64 and 6) triode used as CRT vertical deflection oscillator+amplifier, 925 mA heater, Noval base
6FG5, 6FS5, 6GU5 – Shadow-grid Sharp-cutoff VHF beam pentodes, 200 mA heater, Miniature 7-pin base
6FG7 – Medium-μ triode + semiremote-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6FH5 – High-μ VHF triode, 200 mA heater, Miniature 7-pin base
6FH6 – 17 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, 7-pin Octal base
6FH8 – Medium-μ triode + triple-anode sharp-cutoff tetrode used in harmonic-waveformgenerators and analog TV receivers, 450 mA heater, Noval base
6FJ7 – Compactron Dual dissimilar (μ = 22.5 and 15.4) triode used as CRT vertical deflection oscillator+amplifier, 900 mA heater
6FM7 – Compactron Dual dissimilar (μ = 66 and 5.5) triode used as CRT vertical deflection oscillator+amplifier, 1.05 A heater
6FM8 – Dual diode + high-μ triode used as FM demodulator and AF amplifier, 450 mA heater, Noval base
6FN5/EL300 – 17.6 W Power pentode used as CRT horizontal deflection amplifier, Octal base with anode on top cap; 35FN5/PL300 with a 6.3 V/1.65 A heater
6FQ5, 6FQ5A/6GK5 – VHF Semiremote-cutoff triode used as local oscillator in some analog TV turret tuners, 180 mA heater, Miniature 7-pin base
6FW5 – 18 W Beam power tetrode used as CRT horizontal deflection amplifier, 1.2 A heater, 6-pin Octal base
6FW7 – Subminiature, shielded dual medium-μ VHF triode with a base anticipating the Nuvistor, used as oscillator/mixer, 300 mA heater
6FX4 – 1.25 kV, 2×270 mA Full-wave rectifier, 800 mA heater, Miniature 7-pin base
6FX7 – Subminiature, shielded dual medium-μ VHF triode with a base anticipating the Nuvistor, used as cascode amplifier, 300 mA heater
6FY5/EC97 – Frame-grid, high-μ VHF triode, Miniature 7-pin base; 2FY5/XC97 or 4FY5/PC97 with a 6.3 V/200 mA heater
6FY7 – Compactron Dual dissimilar (μ = 65 and 6) triode used as CRT vertical deflection oscillator+amplifier, 1.05 A heater
6GA8/ECC804 – Separate cathodes dual triode, 300 mA heater, Noval base
6GB5/EL500/EL504 – 17 W Beam power pentode used as CRT horizontal deflection amplifier, 1.38 A heater, Magnoval base with anode on top cap
6GC5 – 12 W AF Beam power pentode, 1.2 A heater, Neonoval base
6GC6 – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, 6-pin Octal base with anode on top cap
6GD7 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 380 mA heater, Noval base
6GE5 – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater
6GE8 (7734) – Low-μ triode + sharp-cutoff pentode used as series-pass regulator and differential amplifier/driver in stabilized DC power supplies, 900 mA heater, Noval base
6GF5 – 9 W Compactron Beam power pentode used as CRT horizontal deflection amplififer, 1.2 A heater
6GF7, 6GF7A – Dual dissimilar (μ = 64 and 5.4) triode used as CRT vertical deflection oscillator+amplifier, 985 mA heater, Novar base
6GH8, 6GH8A – Medium-μ triode + sharp-cutoff pentode used as CRT horizontal deflection oscillator, 450 mA heater, Noval base
6GJ5, 6GJ5A (Evacuation tip at bottom of shorter envelope) – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, Novar base with anode on top cap
6GJ7/ECF801 – VHF Frame-grid triode/pentode oscillator/mixer used in analog TV tuners, 410 mA heater, Noval base
6GJ8 – Triode + pentode used as CRT horizontal deflection oscillator, 600 mA heater, Noval base
6GU7 – Medium-μ dual triode used as CRT vertical/horizontal oscillator or chroma amplifier, 600 mA heater, Noval base
6GV5 – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, anode on top cap
6GV7/ECF805 – VHF Frame-grid triode/remote-cutoff pentode oscillator/mixer used in analog TV tuners, Noval base; 7GV7/PCF805 with a 6.3 V/350 mA heater
6GV8/ECL85 = 6Ф5П↦6F5P – Triode + 7-watts power pentode used as CRT vertical deflection oscillator+amplifier, 900 mA heater, Noval base
6GW5 – Frame-grid VHF triode, 190 mA heater, Miniature 7-pin base
6GW8/ECL86 – AF Triode + 9-watts power pentode used as audio or CRT vertical deflection oscillator+amplifier, 700 mA heater, Noval base
6GX6 – Dual-control, sharp-cutoff pentode used as FM quadrature demodulator, 450 mA heater, Miniature 7-pin base
6GX7 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 400 mA heater, Noval base
6GY5 – 18 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.5 A heater
6GY6 – Dual-control, sharp-cutoff pentode used as gated AGC amplifier/keyer/noise inverter, 450 mA heater, Miniature 7-pin base
6GY8 – Triple high-μ VHF triode used as Autodyne or AFC reactance[87] circuit in FM tuners, 450 mA heater, Noval base, cathode (3), control grid (1) and one side of the heater share pin 4
6GZ5 – 4.8 W AF Power pentode, 380 mA heater, Miniature 7-pin base
6HA5/6HM5/EC900 (6HA5S) – Shielded, frame-grid, vari-μ VHF triode, Miniature 7-pin base; 3HM5/3HA5/LC900, 4HM5/4HA5/PC900 or 2HM5/2HA5/XC900 with a 6.3 V/185 mA heater
6HA6 – 8 W Power pentode used as CRT cathode driver, 710 mA heater, Noval base
6HB5 – 18 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.5 A heater
6HB6 – 10 W Power pentode used as CRT vertical deflection amplifier, 760 mA heater, Noval base
6HB7 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6HC8 – Triode + 11-watts power pentode, 1.2 A heater, Noval base
6HD5 – 24 W Compactron Beam power tetrode used as CRT horizontal deflection amplifier, 2.25 A heater
6HD7 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6HE5/6JB5/6JC5 – 12 W Compactron Beam power tetrode used as CRT vertical deflection amplifier, 800 mA heater
6HE7 – Compactron High-perveance CRT horizontal deflection output booster/damper/efficiency diode + 10-watts beam power pentode used as CRT horizontal deflection amplifier, 2.7 A heater
6HF5 – 28 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.25 A heater, anode on top cap
6HF8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 750 mA heater, Noval base
6HG8/ECF86 – VHF Frame-grid, medium-μ triode/sharp-cutoff pentode oscillator/mixer, 340 mA heater, Noval base
6HJ5 – 24 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.25 A heater
6HJ8 – High-perveance diode + sharp-cutoff pentode used as audio/video detector or gated AGC amplifier/keyer/noise inverter or DC restorer, and IF or video amplifier, 450 mA heater, Noval base
6HK5 – Frame-grid, vari-μ VHF triode, 190 mA heater, Miniature 7-pin base
6HK8 – Dual VHF triode, 400 mA heater, Noval base
6HL5 – 12 W AF Beam power tetrode, 950 mA heater, Noval base
6HL8 – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video or IF amplifier, 600 mA heater, Noval base
6HT6 – Semiremote-cutoff IF pentode, 300 mA heater, Noval base
6HU8/ELL80 – 2×6 W Dual AF power pentode, 550 mA heater, Noval base
6HV5A – 5.5 kV, 35 W, 325 mApeakCompactron Beam power triode used as EHV shunt regulator in analog color TV receivers, μ = 300, 1.8 A heater, anode on top cap
6HZ5/6JD5/6JH5 – 3.5 kV, 35 W, 300 mApeakCompactron Beam power triode with a 2nd grid ("beam plate") connected to the cathode (technically a tetrode), used as EHV shunt regulator in analog color TV receivers, μ = 300, Uh-c=-200...+450 V, 2.4 A heater
6HZ6 – Dual-control, sharp-cutoff pentode used as FM quadrature demodulator, 450 mA heater, Miniature 7-pin base
6HZ8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 1.125 A heater, Noval base
6JA5 – Compactron Beam power pentode used as CRT vertical deflection amplifier, 1 A heater
6JA8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or phase inverter/splitter/comparator, and CRT cathode driver, 750 mA heater, Noval base
6JB6, 6JB6A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, Novar base with anode on top cap
6JC5 – See 6HE5/6JB5/6JC5
6JC6, 6JC6A – Sharp-cutoff IF pentode, 300 mA heater, Noval base
6JC8 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6JD5 – See 6HZ5/6JD5/6JH5
6JD6 – Sharp-cutoff IF pentode, 300 mA heater, Noval base
6JE6 (24 W), 6JE6A (30 W), 6JE6C/6LQ6/6MJ6 (30 W) – Beam power pentode used as CRT horizontal deflection amplifier, 2.5 A heater, Novar base with anode on top cap
6JE8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 780 mA heater, Noval base
6JF6 – 17 W Beam power pentode used as CRT horizontal deflection amplifier, 1.6 A heater, Novar base with anode on top cap
6JG5 – Sharp-cutoff pentode used as video amplifier, 525 mA heater, Noval base
6JG6, 6JG6A – 17 W Beam power pentode used as CRT horizontal deflection amplifier, 1.6 A heater, Novar base
6JH5 – See 6HZ5/6JD5/6JH5
6JH6 – Semiremote-cutoff IF pentode, 300 mA heater, Miniature 7-pin base
6JK5 – 5.5 kV, 35 W, 325 mApeakCompactron Beam power triode used as EHV shunt regulator in analog color TV receivers, μ = 300, 1.8 A heater, anode on top cap
6JK6 – Sharp-cutoff IF pentode, 350 mA heater, Miniature 7-pin base
6JK8 – Dual dissimilar (μ = 70 and 55) triode used as frame-grid, high-μ VHF preamplifier and medium-μ oscillator/mixer in FM tuners, 400 mA heater, Noval base
6JL6 – Semiremote-cutoff IF pentode, 350 mA heater, Miniature 7-pin base
6JL8 – Medium-μ triode + 5-watts power pentode, 750 mA heater, Noval base
6JM6, 6JM6A – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, anode on top cap
6JN6, 6JN6A – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater
6JN8 – Medium-μ triode + sharp-cutoff pentode, 450 mA heater, Noval base
6JQ6 – 10 W Beam power tetrode used as CRT vertical deflection amplifier, integral diode internally connected to the suppressor grid to prevent it from becoming positive, 1.2 A heater, Noval base
6JR6 – 17 W Beam power tetrode used as CRT horizontal deflection amplifier, 1.6 A heater, Novar base
6JS6 (28 W), 6JS6A (28 W), 6JS6C (30 W) – Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.25 A heater
6JT6, 6JT6A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 1.2 A heater, Novar base
6JT8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 725 mA heater, Noval base
6JU8, 6JU8A – 9 mA Quad diode used in FM-stereo demuxers or as color killer phase detector, units 1&2 and 3&4 internally series-connected, 600 mA heater, Noval base
6JV8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 600 mA heater, Noval base
6JW6 – 11.5 W Frame-grid power pentode used as CRT cathode driver, 600 mA heater, Noval base
6JW8/ECF802 – Triode + sharp-cutoff pentode used as CRT horizontal deflection oscillator and reactance tube, 430 mA heater, Noval base
6JZ6 – 18 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.5 A heater
6JZ8 – Compactron Medium-μ triode + 7-watts beam power pentode used as CRT vertical deflection oscillator+amplifier, 1.2 A heater
6KA8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, 600 mA heater, Noval base
6KD6 – 33 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.85 A heater
6KE8 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 400 mA heater, Noval base
6KG6, 6KG6A/EL509 – 40 W Beam power pentode used as CRT horizontal deflection amplifier, 2 A heater, Magnoval base
6KM6 – 20 W Beam power pentode used as CRT horizontal deflection amplifier, 1.6 A heater, Novar base with anode on top cap
6KM8 – Diode + triple-anode sharp-cutoff tetrode used in musical instruments, frequency dividers and complex wave generators, 300 mA heater, Noval base
6KN6 – 30 W Compactron Two internally-paralleled beam power pentodes used as CRT horizontal deflection amplifier, 3 A heater
6KN8 – Dual VHF triode used as cascode amplifier, 400 mA heater, Noval base
6KR8, 6KR8A – Medium-μ triode + sharp-cutoff pentode used as video amplifier, 750 mA heater, Noval base
6KS8 – High-μ triode + semiremote-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector, and video amplifier, 600 mA heater, Noval base
6KT6 – Semiremote-cutoff pentode used as IF amplifier in analog TV receivers, 300 mA heater, Noval base
6KT8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and IF amplifier, 600 mA heater, Noval base
6KU8 – Dual diode + sharp-cutoff pentode used as horizontal phase detector and video amplifier, 725 mA heater, Noval base
6KV6, 6KV6A – 6.5 kV, 20 W, 580 mApeak Beam power pentode used as EHV shunt regulator in analog color TV receivers, 1.6 A heater, Novar base
6KV8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and audio-IF or video amplifier, 775 mA heater, Noval base
6KY6 – 9 W Frame-grid power pentode used as CRT cathode driver, 520 mA heater, Noval base
6KY8, 6KY8A – High-μ triode + 12-watts beam power pentode used as CRT vertical deflection oscillator+amplifier, 1.1 A heater, Novar base
6KZ8 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 450 mA heater, Noval base
6LB6 – 30 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.25 A heater
6LB8 – Medium-μ triode + sharp-cutoff pentode used as DC voltage amplifier and video amplifier, 725 mA heater, Noval base
6LC6 – Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, Octal base with anode on top cap
6LC8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector and gated AGC amplifier/keyer/noise inverter, 600 mA heater, Noval base
6LD6/EL802 – 6 W Power pentode used as CRT cathode driver in analog color TV receivers, 800 mA heater, Noval base
6LF6/6LX6 – 40 W Compactron Beam power tetrode used in CRT horizontal deflection amplifiers, 2 A heater, anode on top cap
6LF8 – High-μ triode + sharp-cutoff pentode used as video amplifier, 600 mA heater, Noval base
6LG6 – 28 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2 A heater
6LH6A/6LJ6A – 27 kV, 40 W, 1.5 mA Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, Octal base with anode on top cap
6LJ8 – Medium-μ triode + sharp-cutoff pentode used as VHF oscillator/mixer, 400 mA heater, Noval base
6LM8, 6LM8A – Medium-μ triode + semiremote-cutoff pentode used as color burst amplifier, 450 mA heater, Noval base
6LQ8 – Medium-μ triode + sharp-cutoff pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode drive, 775 mA heater, Noval base
6LR6 – 30 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.5 A heater
6LR8 – High-μ triode + 14-watts beam power pentode used as CRT vertical deflection oscillator+amplifier, 1.5 A heater, Novar base
6LT8 – Dual diode + pentode used as horizontal oscillator and AFC, 600 mA heater, Noval base
6LU6 – Pentode, 400 mA heater, Miniature 7-pin base
6LU8 – Compactron High-μ triode + 14-watts beam power pentode used as CRT vertical deflection oscillator+amplifier, 1.5 A heater
6LW6 – Beam power pentode used as CRT horizontal deflection amplifier, 2.65 A heater, Octal base with anode on top cap
6LX6 – See 6LF6/6LX6
6LX8/LCF802 – Medium-μ triode + sharp-cutoff pentode used as horizontal oscillator and reactance tube, 450 mA heater, Noval base
6LY8 – High-μ triode + sharp-cutoff pentode used as video amplifier, 750 mA heater, Noval base
6LZ6 – 30 W Beam power pentode used as CRT horizontal deflection amplifier, 2.3 A heater, Novar base with anode on top cap
6MA6 – 30 kV, 40 W, 1.5 mA Beam power triode used as EHV shunt regulator in analog color TV receivers, 200 mA heater, Octal base with anode on top cap
6MB6 – Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.25 A heater
6MB8 – Medium-μ triode + sharp-cutoff pentode used as burst amplifier and video amplifier, 400 mA heater, Noval base
6MC6 – 33 W Beam power pentode used as CRT horizontal deflection amplifier, 2.85 A heater, Novar base with anode on top cap
6MD8 – Triple medium-μ triode used as NTSC chroma signal demodulator matrix in analog color TV receivers, 900 mA heater, Novar base
6ME6 – 30 W Beam power pentode used as CRT horizontal deflection amplifier, 2.3 A heater, Novar base with anode on top cap
6MF8 – Compactron High-μ triode + 12-watts beam power pentode used as CRT vertical deflection oscillator+amplifier, 1.4 A heater
6MG8 – Medium-μ triode + sharp-cutoff pentode used as CRT horizontal deflection oscillator, and combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, 450 mA heater, Noval base
6MH6 – 38.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 2.65 A heater
6MN8 – Compactron Triple high-μ triode used as NTSC chroma signal demodulator matrix in analog color TV receivers, 900 mA heater
6MQ8 – Medium-μ triode + sharp-cutoff pentode, 535 mA heater, Noval base
6MU8 – Medium-μ triode + semiremote-cutoff pentode used as color burst amplifier, 600 mA heater, Noval base
6MV8 – High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and IF amplifier, 600 mA heater, Noval base
6MY8 – Compactron Triode + beam power pentode, 1.45 A heater
6SA7, 6SA7-G, 6SA7-GT – First commercially available heptode pentagrid converter with American grid topology, 300 mA heater, Octal base; derived from 6A7 via 6A8, with the control (#3) grid on pin 8 instead of discarded top cap; Miniature 7-pin version: 6BE6/EK90
6SB7Y (Octal Micanol base), 6BA7 (Noval base) – VHF heptode pentagrid converters with American grid topology, 300 mA heater, 1946
6SC7, 6SC7-GT – Common cathode dual high-μ triode, 300 mA heater, Octal base
6SD7-GT – Semiremote-cutoff RF/IF pentode, 300 mA heater, Octal base
6SE7-GT – Sharp-cutoff pentode, 300 mA heater, Octal base
6SF5, 6SF5-GT – High-μ triode, 300 mA heater, Octal base; derived from 6F5, with the grid on pin 3 instead of discarded top cap
6SF7, 6SF7-GT – Diode + remote-cutoff RF/IF pentode, 300 mA heater, Octal base
6SG7, 6SG7-GT – Semiremote-cutoff RF/IF pentode, 300 mA heater, Octal base
6SH7, 6SH7-GT, 6SH7L – Sharp-cutoff RF/IF pentode, 300 mA heater, Octal base
6SJ7, 6SJ7-GT (Bakelite base), 6SJ7Y (Micanol base) – Dual-control, sharp-cutoff RF pentode, 300 mA heater, Octal base, control grid on pin 4; derived from 6J7, with the control grid on pin 4 instead of discarded top cap, and the screen grid on pin 6; similar to types 1603, 77 and U6A-based type 6C6 (control grid on top cap)
6SK7 = 6К3↦6K3, 6SK7-G, 6SK7-GT – Remote-cutoff pentode used in IF amplifiers of North American radios, 300 mA heater, Octal base; derived from 6K7, with the control grid on pin 4 instead of discarded top cap, and the screen grid on pin 6; Miniature 7-pin version: 6BD6
6SL7-G/ECC35, 6SL7-GT – General purpose dual triode, 300 mA heater, Octal base; similar to 6Н9С↦6N9S; ruggedized version: 6SL7-WGT
6SN7-G/ECC32, 6SN7-GT = Brimar 13D2, 6SN7-GTA, 6SN7-GTB – Dual medium-μ triode used in audio amplifiers, Hammond organs, television, and extensively in World War II radar and in the ENIAC computer, each section is equivalent to a 6J5, μ = 20, 600 mA heater, Octal base; derived from 6N7-G, 6F8-G discarding the control grid top cap; Noval version: 6CG7/6FQ7, later 12AU7; ruggedized versions: 6SN7-WGT, 6SN7-WGTA, 5692, 6042, 6180, CV1986; similar to 6Н8С↦6N8S, M-OV/GEC B65
6SQ7, 6SQ7-G, 6SQ7-GT/PBC3 – Dual diode + high-μ triode, 300 mA heater, Octal base; derived from 6Q7, with revised pinout, discarding its control grid top cap
6SR7, 6SR7-GT – Dual diode + medium-μ triode, Octal base; derived from 6R7, with revised pinout, discarding its control grid top cap; 12SR7 with a 6.3 V/300 mA heater
6SS7, 6SS7-GT – Remote-cutoff pentode, Octal base, found in some AA6 radios as both the RF amplifier and first IF. This is the only RETMA tube to have a same-letter repetition; derived from 6S7, with the control grid on pin 4 instead of discarded top cap; 6SK7 with a 6.3 V/150 mA heater
6ST7 – Dual diode + high-μ triode, 300 mA heater, Octal base; derived from 6T7, with revised pinout, discarding its control grid top cap
6SU7-GTY – 6SL7-GT with a Micanol base; avionics version: 6SU7-WGT/6188
6SV7 – Diode + sharp-cutoff pentode, 300 mA heater, Octal base
6SZ7 – Dual diode + high-μ triode, 150 mA heater, Octal base
6ZY5-G – 1.25 kV, 2×120 mA Full-wave rectifier, 300 mA heater, 6-pin Octal base
More of these tubes are listed as equivalents under M-P E - 6.3 V heater
These tubes all have a Loctal base and a 6.3 V heater, despite the 7-prefix; actual 7-volts series heater tubes are listed below
7A4 = Philco XXL – 6J5 Medium-μ triode, 300 mA heater, with a Loctal base
7A5 – 5.5 W Beam power pentode, 7 V/800 mA (Sylvania) or 6.3 V/750 mA (Tung-Sol) heater; similar to 6U6-GT
7A6 – Dual diode, 150 mA heater; similar to 6H6
7A7, 7A7-LM – 6SK7-GT Remote-cutoff pentode, 300 mA heater, with a Loctal base
7A8 – The only American-made, commercially available octode pentagrid converter used mostly in Philco radios, produced in 1939 by Sylvania; 7B8 with a suppressor grid and a 150 mA heater
7B4 – 6SF5-GT High-μ triode, 300 mA heater, with a Loctal base
7B5, 7B5-LT – 8.5 W AF Power pentode, 400 mA heater; types 41, 6K6-GT with a Loctal base
7B6, 7B6-LM – Dual diode + high-μ triode, 300 mA heater; type 75 with a Loctal base; similar to 6AV6/EBC91, 6SQ7
7B7 – Remote-cutoff pentode, 150 mA heater
7B8, 7B8-LM – Heptode pentagrid converter, 300 mA heater; 6A7, 6A8 with a Loctal base
7C4 – Detector diode, 150 mA heater
7C5, 7C5-LT – 6V6-GT 12 W Beam power pentode, 450 mA heater, with a Loctal base
7C6 – Dual diode + high-μ triode, 150 mA heater
7C7 – Sharp-cutoff pentode, 7 V/160 mA (Sylvania) or 6.3 V/300 mA (Tung-Sol) heater
7D7 – Triode/heptode oscillator/mixer, 7 V/480 mA heater
7E5 – Medium-μ RF triode, 150 mA heater
7E6 – 6SR7 Dual diode + medium-μ triode, 300 mA heater, with a Loctal base; Miniature 7-pin version: 6BF6
7E7 – Dual diode + semiremote-cutoff pentode, 300 mA heater; similar to 6B8-GT
7F7 – 6SL7-GT Dual high-μ triode, 300 mA heater, with a Loctal base
7F8 – 400 MHz Dual medium-μ triode used as amplifier or converter, 300 mA heater; ruggedized version: 7F8-W
7G7 – Dual-control, sharp-cutoff pentode, 450 mA heater
7G8 – Dual sharp-cutoff tetrode, 7 V/320 mA heater
7H7 – Semiremote-cutoff pentode, 300 mA heater
7J7 – Triode/heptode oscillator/mixer, 300 mA heater; similar to 6J8-G
7K7 – Dual diode + high-μ triode, 300 mA heater; similar to 6AT6/EBC90, 6Q7
7L7 – Dual-control, sharp-cutoff pentode, 300 mA heater
7N7 – 6SN7-GT Dual medium-μ triode, 600 mA heater, with a Loctal base
7Q7 – Heptode pentagrid converter, 7 V/320 mA heater; similar to 6SA7
7R7 – Dual diode + remote-cutoff pentode, 300 mA heater
7S7 – Triode/heptode oscillator/mixer, 300 mA heater
7T7 – Sharp-cutoff pentode, 300 mA heater
7V7 – Dual-control, sharp-cutoff pentode, 450 mA heater; 7W7 but with the suppressor grid on pin 4, an internal shield on pin 5, and the cathode on pin 7
7W7 – Sharp-cutoff pentode; 7V7 but with the suppressor grid and internal shield on pin 5, and the cathode on pins 4 and 7Note: When substituting a 7V7 for a 7W7 or vice-versa, verify connections on socket pins 4 and 7; pin 5 is usually connected to the chassis
7X6 – Dual 700 V, 450 mA rectifier with separate cathodes used as a voltage doubler, 1.2 A heater
7X7 = Philco XXFM – High-μ triode + common-cathode diode + separate-cathode diode used as FM ratio detector and AF amplifier, 300 mA heater
7Y4 – 1.25 kV, 2×210 mA Full-wave rectifier, 500 mA heater
7Z4 – 1.25 kV, 2×300 mA Full-wave rectifier, 450 mA heater
7AB7 – Sharp-cutoff RF pentode, 150 mA heater
7AD7 – 10 W Power pentode used as wideband IF amplifier or as CRT cathode driver, 600 mA heater
7AF7 – Dual medium-μ triode, 300 mA heater
7AG7 – Sharp-cutoff pentode, 150 mA heater
7AH7 – Remote-cutoff pentode, 150 mA heater
7AJ7 – Sharp-cutoff pentode, 300 mA heater
7AK7 – Dual-control, sharp-cutoff pentode used in computer equipment, 800 mA heater. Perhaps the first tube specifically designed for computer use
Many of their heaters are rated 150 mA and so were popular in AA5 radio receivers; others are rated 300, 450 or 600 mA for use also in analog TV receivers
—with a straight heater:
12A6, 12A6-GT – 7.5 W Avionics AF Beam power tetrode, 150 mA heater, Octal base[93]: 45 – not related to 2A6 nor 6A6
12A7 – 125 VRMS, 30 mA Half-wave rectifier + 550 mWoutput power pentode used in one-tube portable phonographs and a few two- and three-tube radios, 300 mA heater, U7A base with top cap; pentode section is similar to type 38; forerunner of such types as 32L7-GT, 70L7-GT and 117L7-GT – not related to 2A7 and 6A7 pentagrid
12A8-G, 12A8-GT – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 150 mA heater, Octal base
12B3 – CRT horizontal deflection output booster/damper/efficiency diode, 600 mA heater, Noval base with cathode on top cap
12B6-GM – Diode + high-μ triode, 150 mA heater, Octal base with control grid on top cap
12B7, 12B7-ML – Renamed to 14A7 due to Loctal base
12B8-GT – Triode + remote-cutoff pentode, 300 mA heater, Octal base with pentode control grid on top cap
12C5/12CU5 – 6 W AF Beam power pentode, 600 mA heater, Miniature 7-pin base
12C8, 12C8-G, 12C8-GT – Dual diode + semiremote-cutoff pentode, Octal base with control grid on top cap; 6B8 with a 150 mA heater
12D4, 12D4A – CRT horizontal deflection output booster/damper/efficiency diode, 600 mA heater, 6-pin Octal base
12E5-GT – Triode, 150 mA heater, 6-pin Octal base
12F5-GT – High-μ triode, 150 mA heater, 7-pin Octal base with grid on top cap
12F8 – Dual diode + remote-cutoff pentode used as detector and AF amplifier, 150 mA heater, Noval base
12G4 – Medium-μ triode, 150 mA heater; 12J5 with a Miniature 7-pin base
12G11 – Compactron Dual-control, sharp-cutoff pentode + 6.5-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 600 mA heater
12H6 – Dual diode, 150 mA heater, 7-pin Octal base
12J5, 12J5-GT – Medium-μ triode, 6-pin Octal base; 6J5-GT with a 12.6 V/150 mA heater; avionics version: 12J5-WGT
12J7-GT – Sharp-cutoff pentode, 150 mA heater, 7-pin Octal base with control grid on top cap
12K7-G, 12K7-GT – Remote-cutoff pentode, 150 mA heater, 7-pin Octal base with control grid on top cap
12K8, 12K8-GT – Triode/hexode oscillator/mixer, 150 mA heater, Octal base with hexode control grid #1 on top cap
12L6-GT – 10 W Beam power tetrode, Octal base; 6W6-GT, 25L6-GT or 50L6-GT with a 12.6 V/600 mA heater
12L8-GT – 2×2.5 W Common cathode dual power pentode used as a parallel-connected or push-pull output amplifier, 150 mA heater, Octal base
12Q7-G, 12Q7-GT – Dual diode + high-μ triode, 150 mA heater, 7-pin Octal base with grid on top cap
12R5 – 4.5 W Beam power pentode used as CRT vertical deflection amplifier, 600 mA heater, Miniature 7-pin base
12S7/UAF42 – Diode + remote-cutoff RF/IF/AF pentode, 100 mA heater, Rimlock base
12S8-GT – Triple diode + high-μ triode, 150 mA heater, Octal base with grid on top cap
12T10 – CompactronDual-control, sharp-cutoff pentode + 10-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 450 mA heater
12U5-G – Tuning indicator; 6U5-G with a 12.6 V/150 mA heater
12V6-GT – 12 W Beam power pentode used as audio power amplifier or CRT vertical deflection amplifier, 6- or 7-pin Octal base; 5V6 or 6V6 with a 12.6 V/225 mA heater
12W6-GT – 12 W Beam power pentode used as audio power amplifier or CRT vertical deflection amplifier, 600 mA heater, 6- or 7-pin Octal base
12X3 – 7 kV, 10 mA Half-wave rectifier, 650 mA heater, UX4 base
12X4 – 1.25 kV, 2×210 mA Full-wave rectifier, Miniature 7-pin base; 6X4/6BX4/EZ90 with a 12.6 V/300 mA heater
12Y4 – 420 V, 2×8 mA Full-wave rectifier, 150 mA heater, O5A European 5-pin base
12Z3 – Half-wave rectifier, 300 mA heater, UX4 base
12AB5 – 12 W Beam power tetrode, 200 mA heater, Noval base[94]
12AC5/UF41 – Remote-cutoff RF pentode, 100 mA heater, Rimlock base
12AD5 – Remote-cutoff RF pentode, 100 mA heater, Noval base
12AE6, 12AE6A – Dual diode + medium-μ triode used as detector and AF amplifier, 150 mA heater, Miniature 7-pin base
12AE10 – Compactron Sharp-cutoff pentode + 6-watts beam power tetrode, 450 mA heater[94]
12AF3 – CRT horizontal deflection output booster/damper/efficiency diode, 600 mA heater, Noval base with cathode on top cap
12AF6 – Remote-cutoff RF/IF pentode, 150 mA heater, Miniature 7-pin base
12AF11 – Compactron High-μ triode + medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and video amplifier, 450 mA heater
12AH7-GT = 12Н11С↦12N11S – Dual medium-μ triode, μ = 16, 150 mA heater, Octal base
12AJ6 – Dual diode + medium-μ triode, 150 mA heater, Miniature 7-pin base
12AJ7/HCH81 – Triode/remote-cutoff heptode oscillator/mixer, 150 mA heater, Noval base; 19D8/UCH81 with a 12.6 V/150 mA heater
12AL5/HAA91 – Dual diode with separate cathodes, Miniature 7-pin base; 6AL5/EAA91, UAA91 or 3AL5/XAA91 with a 12.6 V/150 mA heater
12AL11 – Compactron Dual-control, sharp-cutoff pentode + 10-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 450 mA heater
12AQ5 (HL90) – 12 W Beam power pentode used as audio power amplifier or CRT vertical deflection amplifier, 225 mA heater, Miniature 7-pin base
12AS5 – 5.5 W AF Beam power pentode, 400 mA heater, Miniature 7-pin base
12AT6/HBC90 – Dual diode + triode, 150 mA heater, Miniature 7-pin base; superseded by 12AV6/HBC91 in consumer radios
12AU6/HF94, 12AU6A – Sharp-cutoff RF pentode, 150 mA heater, Miniature 7-pin base
12AU8 – Medium-μ triode + sharp-cutoff pentode, 300 mA heater, Noval base
12AV5-GA – 11 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Octal base
12AV6/HBC91, 12AV6A – Dual diode + high-μ triode, Miniature 7-pin base; 6AV6/EBC91 with a 12.6 V/150 mA heater
12AW6 – Sharp-cutoff pentode, 150 mA heater, Miniature 7-pin base
12BE6/HK90, 12BE6A – Heptode pentagrid converter with American grid topology, Miniature 7-pin base; 6BE6/EK90 with a 12.6 V/150 mA heater
12BF6 – Dual diode + medium-μ triode, 150 mA heater, Miniature 7-pin base
12BF11 – Compactron Dual-control, sharp-cutoff pentode + 6.5-watts beam power pentode used as FM quadrature demodulator and AF power amplifier, 600 mA heater
12BK5 – 9 W AF Beam power pentode, 600 mA heater, Noval base
12BK6 – Common cathode dual diode + high-μ AF triode, Miniature 7-pin base; 6BK6 or 26BK6 with a 12.6 V/150 mA heater
12BL6 – Semiremote-cutoff RF/IF pentode, 150 mA heater, Miniature 7-pin base
12BN6, 12BN6A – Gated-beam discriminator pentode used as FM quadrature demodulator, Miniature 7-pin base; 3BN6, 4BN6, 6BN6 with a 12.6 V/150 mA heater
12BQ6-GT, 12BQ6-GA, 12BQ6-GTB/12CU6 – 11 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Octal base
12BR3 – CRT horizontal deflection output booster/damper/efficiency diode, 600 mA heater, Noval base
12BS3, 12BS3A/12DW4A – CRT horizontal deflection output booster/damper/efficiency diode, 600 mA heater, Novar base
12DW5 – 11 W Beam power pentode used as CRT vertical deflection amplifier, 600 mA heater, Noval base
12DZ8 – High-μ AF triode + 6.5-watts AF power pentode, 12.0 V/450 mA heater, Noval base
12ED5 – 6.25 W AF Beam power pentode, 450 mA heater, Miniature 7-pin base
12EF6 – 10 W Beam power pentode used as CRT vertical deflection amplifier, 450 mA heater, Octal base
12EH5 – 5.5 W AF Beam power pentode, 600 mA heater, Miniature 7-pin base
12EN6 – 7 W Beam power pentode used as CRT vertical deflection amplifier, 600 mA heater, 7-pin Octal base
12EQ7 – Diode + sharp-cutoff pentode used as detector and IF amplifier, 150 mA heater, Noval base
12FB5 – Power pentode used as CRT vertical deflection amplifier, 300 mA heater, Noval base
12FQ7 – Medium-μ dual triode used as CRT horizontal and vertical deflection oscillator, Noval base; 6CG7/6FQ7, 8CG7/8FQ7 with a 12.6 V/300 mA heater
12FQ8 – Common cathode, dual split-anode triode used in musical instruments, frequency dividers and complex wave generators, μ = 95, 150 mA heater, Noval base[95]
12FX5 – 5.5 W AF Beam power pentode, Miniature 7-pin base; 19FX5 or 60FX5 with a 12.6 V/450 mA heater
12GC6 – 17.5 W Beam power tetrode used as CRT horizontal deflection amplifier, 600 mA heater, 6-pin Octal base
12GE5 – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater
12GJ5, 12GJ5A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Novar base
12GN6 – Remote-cutoff RF/IF pentode, 150 mA heater, Miniature 7-pin base
12GT5, 12GT5A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Novar base
12GW6 – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, 6-pin Octal base
12HE7 – Compactron High-perveance CRT horizontal deflection output booster/damper/efficiency diode + 10-watts beam power pentode used as CRT horizontal deflection amplifier, 1.35 A heater
12HL5 – 12 W AF Beam power tetrode, 450 mA heater, Noval base
12HU8/PLL80 – 2×6 W Dual AF power pentode, 300 mA heater, Noval base
12JB6, 12JB6A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Novar base
12JF5 – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater
12JN6, 12JN6A – 17.5 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater
12JN8 – Medium-μ triode + sharp-cutoff pentode, 225 mA heater, Noval base
12JQ6 – 10 W Beam power tetrode with integral diode used as CRT vertical deflection amplifier, 600 mA heater, Noval base
12JS6 – 28 W Compactron Beam power pentode used as CRT horizontal deflection amplifier, 1.125 A heater
12JT6, 12JT6A – 17.5 W Beam power pentode used as CRT horizontal deflection amplifier, 600 mA heater, Novar base
12KL8 – Diode + sharp-cutoff pentode, 150 mA heater, Noval base
12MD8 – Triple medium-μ triode used as NTSC chroma signal demodulator matrix in analog color TV receivers, 450 mA heater, Novar base
12MN8 – Compactron Triple high-μ triode used as NTSC chroma signal demodulator matrix in analog color TV receivers, 450 mA heater
12SA7, 12SA7-GT – Heptode pentagrid converter with American grid topology, 150 mA heater; 12BE6/HK90 with an Octal base
12SC7 = 12Н10С↦12N10S – Dual high-μ AF triode used as amplifier or phase inverter, μ = 70, 150 mA heater, Octal base
12SF5, 12SF5-GT – High-μ triode, 150 mA heater, Octal base; derived from 12F5, with the grid on pin 3 instead of discarded top cap
12SF7, 12SF7-GT – Diode + remote-cutoff RF/IF pentode, 150 mA heater, Octal base
12SG7 – Remote-cutoff RF/IF pentode, 150 mA heater, Octal base
12SJ7, 12SJ7-GT – Sharp-cutoff RF/AF pentode, 150 mA heater, Octal base; derived from 12J7, with the control grid on pin 4 instead of discarded top cap, and the screen grid on pin 6
12SK7, 12SK7-GT – Remote-cutoff pentode, 150 mA heater; 12BA6/HF93 with an Octal base; derived from 12K7 with the control grid on pin 4 instead of top cap, and the screen grid on pin 6
12SL7-GT – High-μ dual triode used as AF or DC voltage amplifier, μ = 70, 150 mA heater, Octal base
12SN7-GT, 12SN7-GTA – Medium-μ dual triode used as phase inverter or CRT horizontal or vertical oscillator, μ = 20, 300 mA heater, Octal base; ruggedized version: 12SN7-WGT
12SQ7, 12SQ7-GT – Dual diode + triode, 150 mA heater; 12AV6/HBC91 with an Octal base; derived from 12Q7, with revised pinout, discarding its control grid top cap
12SR7, 12SR7-GT – Dual diode + triode used as detector and AF amplifier, Octal base; 6SR7 with a 12.6 V/150 mA heater
Parallel heater circuits - the same tube may be wired for 6.3 or 12.6V,
Series heater strings - the same tube may be wired for e.g. 150 or 300mA
12A4 – High-perveance triode used as CRT vertical deflection amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
12A5 – 8.25 W Power pentode mostly used in pre-war car radios, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, U7A base
12B4A – 5.5 W Power triode, μ = 6.5, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base[94]
12H4 – Triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Miniature 7-pin base
12Z5 = 6Z5 (Commonly branded as 6Z5/12Z5) – Full-wave rectifier used as renewal type for Majestic receivers, U6A base; similar to types 6Z4/84 and 6X5, but with a center-tapped 12.6 V/400 mA resp. 6.3 V/800 mA heater
12AD7 – Dual high-μ, low-microphonics triode, μ = 100, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base
12AH8 – Triode/heptode oscillator/mixer, center-tapped 12.6 V/150mA resp. 6.3 V/300 mA heater, Noval base
12AT7/ECC81 = M-OV/GEC B309 (12AT7-WA, 6060, 6201, M8162) – Dual high-μ triode used as amplifier/mixer in VHF tuners, μ = 60, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater[94]
12AU7/ECC82 = M-OV/GEC B329 (12AU7-WA, 6067, 6189, M8136) – Dual medium-μ AF triode, μ = 20, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater.[94] Two 6C4/EC90s in one envelope;[96] however, it is only specified as an audio frequency tube
12AV7 (5965) – Dual medium-μ VHF triode used as amplifier or mixer, μ = 41, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater[97]
12AX7/ECC83 = M-OV/GEC B339 (12AX7S, 12AX7-WA, 6057, 6681, M8137) – Dual high-μ AF triode used in high-gain audio amplifiers, μ = 100, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater; very similar to triode section of 6AV6/EBC91;[94] similar to 6Н2П↦6N2P
12AY7 – Dual low-noise, medium-μ triode used as preamplifier, μ = 44, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater[94]
12AZ7, 12AZ7A – Dual medium-μ triode used as AF amplifier or combined oscillator/mixer, μ = 60, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base[98][94]
12BH7, 12BH7A – 2×3.5 W Dual medium-μ power triode, μ = 21, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater[99][94]
12BR7, 12BR7A – Dual diode + triode, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater; 9BR7 with a different heater – not related to 6BR7 pentode
12BV7, 12BY7/EL180, 12DQ7 – Power pentodes used as CRT cathode driver, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base[100]
12BZ7 – Dual high-μ triode used as combined sync sep/clipper/amplifier/phase detector, μ = 100, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
12DF5 – Dual 1.275 kV, 350 mA rectifier with separate cathodes used as a voltage doubler, center-tapped 12.6 V/450 mA resp. 6.3 V/900 mA heater, Noval base
12DF7 – Dual triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base; low-microphonics variant of 12AX7/ECC83
12DM7 – Dual high-μ triode, low hum, μ = 100, center-tapped 12.6 V/130 mA resp. 6.3 V/260 mA heater, Noval base
12DT7 – Dual high-μ AF triode, μ = 100, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
12DW7/ECC832 (7247) – Dual dissimilar (μ = 20 and 100) AF triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base; one half 12AU7/ECC82-type triode, other half 12AX7/ECC83-type triode
12GN7/12HG7 – Sharp-cutoff pentode used as video amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
12HL7 – Sharp-cutoff pentode used as video amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
12J8 – Dual diode + low (12.6-30 V) anode voltage power tetrode, 325 mA heater, Noval base
12K5 – Low (12.6-30 V) anode voltage power tetrode with a space charge grid, 400 mA heater, Miniature 7-pin base
12U7 – Dual low (12.6-30 V) anode voltage, medium-μ triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
12AC6 – Low (12.6-30 V) anode voltage remote-cutoff pentode, 150 mA heater, Miniature 7-pin base
12AD6 – Low (10.0-15.9 V) anode voltage sharp-cutoff heptode pentagrid converter with American grid topology, 150 mA heater, Miniature 7-pin base
12AE7 – Dual dissimilar (μ = 13 and 6.4), low (12.6-16 V) anode voltage AF triode for use in semi-transistorized car radios, 450 mA heater, Noval base
12AG6 – Low (12.6-16 V) anode voltage heptode pentagrid converter with American grid topology, 150 mA heater, Miniature 7-pin base
12AL8 – Low (12.6-30 V) anode voltage medium-μ triode + power tetrode with a space charge grid, 550 mA heater, Noval base
12CN5 – Low (12.6-16 V) anode voltage sharp-cutoff IF pentode, 450 mA heater, Miniature 7-pin base
12CX6 – Low (12.6-33 V) anode voltage sharp-cutoff pentode, 150 mA heater, Miniature 7-pin base
12CY6 – Low (12.6-16 V) anode voltage sharp-cutoff RF pentode, 200 mA heater, Miniature 7-pin base
12DE8 – Diode + low (12.6-30 V) anode voltage, remote-cutoff pentode, 200 mA heater, Noval base
12DK5 – Low (12.6-16 V) anode voltage sharp-cutoff RF/IF pentode, 300 mA heater, Noval base
12DK7 – Dual diode + low (12.6-30 V) anode voltage power tetrode, 500 mA heater, Noval base
12DL8 – Dual diode + low (12.6-30 V) anode voltage power tetrode with a space charge grid, 550 mA heater, Noval base
12DS7, 12DS7A – Dual diode + low (12.6-16 V) anode voltage power tetrode, 400 mA heater, Noval base
12DU7 – Dual diode + low (12.6-16 V) anode voltage power tetrode, 250 mA heater, Noval base
12DV7 – Dual diode + low (12.6-16 V) anode voltage triode, 150 mA heater, Noval base
12DV8 – Dual diode + low (12.6-16 V) anode voltage power tetrode with a space charge grid, 375 mA heater, Noval base
12DW8 – Diode + dual dissimilar (μ = 9.5 and 6.4), low (12.6-16 V) anode voltage AF triode for use in semi-transistorized car radios, 450 mA heater, Noval base
12DY8 – Low (12.6-16 V) anode voltage medium-μ triode + remote-cutoff pentode, 350 mA heater, Noval base
12DZ6 – Low (12.6-16 V) anode voltage RF pentode, 190 mA heater, Miniature 7-pin base
12EA6 – Low (12.6-16 V) anode voltage IF pentode, 175 mA heater, Miniature 7-pin base
12EC8 – Low (12.6-16 V) anode voltage medium-μ triode + semiremote-cutoff pentode, 225 mA heater, Noval base
12EG6 – Low (12.6-30 V) anode voltage heptode pentagrid converter with American grid topology, both control grids #1 and #3 are sharp-cutoff, 150 mA heater, Miniature 7-pin base
12EK6 – Low (12.6-16 V) anode voltage sharp-cutoff RF/IF pentode, 200 mA heater, Miniature 7-pin base
12EL6 – Dual diode + low (12.6-30 V) anode voltage, high-μ triode, 150 mA heater, Miniature 7-pin base
12EM6 – Diode + low (12.6-30 V) anode voltage power tetrode, 500 mA heater, Noval base
12EZ6 – Low (12.6-30 V) anode voltage sharp-cutoff RF/IF pentode, 175 mA heater, Miniature 7-pin base
12FA6 – Low (12.6-30 V) anode voltage heptode pentagrid converter with American grid topology, 150 mA heater, Miniature 7-pin base; car radio variant of 12BE6/HK90
12FK6 – Low (12.6-16 V) anode voltage dual diode + low-μ triode used as detector, AVC rectifier and AF amplifier, 150 mA heater, Miniature 7-pin base
12FM6 – Dual diode + low (12.6-30 V) anode voltage, medium-μ triode, 150 mA heater, Miniature 7-pin base
12FR8 – Diode + low (12.6-16 V) anode voltage triode + pentode used as IF/AF amplifier and detector, 320 mA heater, Noval base
12FT6 – Dual diode + low (12.6-30 V) anode voltage triode used as detector and AF Amplifier, 150 mA heater, Miniature 7-pin base
12FX8, 12FX8A – Low (12.6-16 V) anode voltage triode/heptode oscillator/mixer, 270 mA heater, Noval base
12GA6 – Low (12.6-16 V) anode voltage heptode pentagrid converter with American grid topology, 150 mA heater, Miniature 7-pin base; similar to 12FA6, but with lower conversion transconductance
12SW7 – Dual diode + low (26.5-250 V) anode voltage triode, 150 mA heater, Octal base
12SX7-GT – Dual low (26.5-300 V) anode voltage triode, 300 mA heater, Octal base
12SY7, 12SY7-GT – Low (26.5-300 V) anode voltage pentagrid converter, 150 mA heater, Octal base
These tubes have 12.6 V heaters despite the 14-prefix, intended to indicate a Loctal base. Most draw 150 mA for use in AA5 radio receivers; actual 14-volts series heater tubes are listed below
14A4 – 7A4 Medium-μ triode with a 12.6 V/150 mA heater; 12J5 with a Loctal base
14A5 – 7.5 W Beam power pentode, 150 mA heater
14A7 = 12B7 (Commonly branded as 14A7/12B7) – 7A7 Remote-cutoff pentode with a 12.6 V/150 mA heater; 12SK7-GT with a Loctal base
14B6 – 7B6 Dual diode + high-μ triode with a 12.6 V/150 mA heater; similar to 12AV6/HBC91, 12SQ7
14B8 – 7B8 Heptode pentagrid converter with a 12.6 V/150 mA heater; 12A8 with a Loctal base
14C5 – 7C5 Beam power pentode with a 12.6 V/225 mA heater; 12V6-GT with a Loctal base
14C7 – 7C7 Sharp-cutoff pentode with a 12.6 V/150 mA heater
14E6 – 7E6 Dual diode + medium-μ triode with a 12.6 V/150 mA heater; 12SR7 with a Loctal base
14E7 – 7E7 Dual diode + semiremote-cutoff pentode with a 12.6 V/150 mA heater; similar to 12C8
14F7 – 7F7 Dual high-μ triode with a 12.6 V/150 mA heater; 12SL7-GT with a Loctal base
14F8 – 7F8 Medium-μ VHF triode with a 12.6 V/150 mA heater, used as amplifier or converter
14H7 – 7H7 Semiremote-cutoff pentode with a 12.6 V/160 mA heater
14J7 – 7J7 Triode/heptode oscillator/mixer with a 12.6 V/150 mA heater
14N7 – 7N7 Dual medium-μ triode with a 12.6 V/300 mA heater; 12SN7-GT with a Loctal base
14Q7 – 7Q7 Heptode pentagrid converter with a 12.6 V/150 mA heater; similar to 12SA7
14R7 – 7R7 Dual diode + remote-cutoff pentode with a 12.6 V/150 mA heater
14S7 – 7S7 Triode/heptode oscillator/mixer with a 12.6 V/150 mA heater
14W7 – 7W7 Sharp-cutoff pentode with a 14 V/240 mA heater
14X7 – 7X7/XXFM Dual diode + high-μ triode on separate cathodes with a 14 V/160 mA heater, used as FM ratio detector and AF amplifier
14Y4 – 7Y4 1.25 kV, 2×210 mA Full-wave rectifier with a 14 V/320 mA heater
14AF7 = Philco XXD – 7AF7 Dual medium-μ triode with a 12.6 V/150 mA heater
25F5 – 50C5 Beam power pentode with half the heater power, allowing for push-pull output amplifiers with the heater spec of a single 50C5
For AA5 radio receivers with 300 mA series heater strings
25A6, 25A6-G – AF Power pentode; type 43 with an Octal base
25B5 (U6A base), 25N6-G (Octal base) – Triple-Twin AF signal + 4-watts zero bias power triode, internally connected as a cathode follower like today's Darlington transistors, μ = 35; 6B5 resp. 6N6-G with a 25 volt heater
25B6-G (5824) – 12.5 W AF Power pentode, Octal base
25C5 – 50C5 Beam power pentode with a 25 volt heater
25L6 – 12L6 or 50L6 Beam power pentode with a 25 volt heaterBesides AA5, also popular for high-speed gating, or as a relay or keypunchsolenoid driver, in early computers such as the UNIVAC I, where the heater ran off the equipment's 24-volts supply bus. As the 25L6-GT developed cathode interface/poisoning after prolonged periods in cut-off, the EIA-type 6046 was derived from it, which didn't suffer from this problem
25Z4, 25Z4-GT – 125 Vrms, 125 mA Half-wave rectifier, Octal base
25Z5 (U6A base), 25Z6 (Octal base) – Dual 700 V, 450 mA rectifier with separate cathodes used as a voltage doubler
These tubes operate with their heaters connected directly to the 117 volt (now 120 volt) electrical mains of North America. They are indirectly heated and were used in one-tube phonographs and Three-way portable (AC or DC mains, or batteries) radio receivers
117Z3 (Miniature 7-pin base), 117Z4-GT (Octal base) – 330 V, 540 mA Half-wave rectifier, 40 mA heater
117Z6-GT – Dual, separate cathodes 700 V, 60 mA rectifier used as a voltage doubler, 75 mA heater, Octal base; some versions have a heater center-tap on pin 1 for 150 mA/58.5 V operation
14GT8/7724, 14JG8 – Dual diode + high-μ triode used as FM demodulator and AF amplifier in fixed, series-heated, or mobile, parallel-heated equipment, 14 V heater, Noval base
17EW8/HCC85 – 6AQ8/ECC85, 9AQ8/PCC85 or UCC85 Dual triode with a 17.5 V heater
19HV8 – AF triode + IF pentode, 18.9 V heater, Noval base
19T8 – 6T8 Triple diode + triode with an 18.9 V heater; HABC80 with a shorter glass envelope
40B2 – 20 to 60 V Barretter, Octal base, to stabilize against mains voltage fluctuations
50JY6 – Horizontal deflection beam power pentode, 50 V heater, Octal base
56R9 – Compactron AF triode + beam power pentode, separate heaters for triode (14 V) and pentode (42 V) for flexibility with the series string order
60E3 – Half-wave rectifier, 60 V heater, Miniature 7-pin base
70A7-GT (With heater tap for a pilot lamp), 70L7-GT – Half-wave rectifier + beam power pentode, 70 V heater, Octal base
More of these tubes are listed as equivalents under M-P H - 150 mA heater
Most are series heater versions of respective 6-prefix tubes; used in analog TV receivers with series heater strings
4HK5 – 2HK5, 3HK5 or 6HK5 VHF triode with a 4.0 V heater
6AU7 – 12AU7/ECC82 Dual AF triode with a center-tapped 300 mA/6.3 V resp. 600 mA/3.15 V heater, Noval base
6AX7 – 12AX7/ECC83 Dual AF triode with a center-tapped 300 mA/6.3 V resp. 600 mA/3.15 V heater
6CN7 – 8CN7 Dual common cathode diode + high-μ triode used as reactance tube or combined sync sep/clipper/amplifier/phase detector, center-tapped 300 mA/6.3 V resp. 600 mA/3.15 V heater, Noval base
7AN7/PCC84 – 6CW7/ECC84 Dual VHF triode with a 7.2 V heater – not related to 6AN7/ECH80 triode/hexode
7AU7/XCC82 – 6AU7 Dual triode with a center-tapped 300 mA/7.0 V resp. 600 mA/3.5 V heater
7DJ8 – 6DJ8 Dual VHF triode with a 7 V heater
7FC7/PCC89 – 6FC7/ECC89 Dual VHF triode with a 7.2 V heater
7GS7 – 6GS7 Triode + pentode with a 7.6 V heater
7GV7/PCF805 – 6GV7/ECF805 Triode + pentode with a 7.4 V heater
7HG8/PCF86 – 4HG8/XCF86, 5HG8/LCF86, 6HG8/ECF86 or 8HG8 VHF Triode/pentode oscillator/mixer with a 7.2 V heater
9AK8/PABC80 – 6AK8/EABC80 Triple diode + triode with a 9.5 V heater
16Y9 – Pentode + power pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode driver, Decal base; 17Y9/PFL200 with a 16.5 V heater
18A5 – Beam power pentode used as CRT horizontal deflection amplifier, 18.5 V heater, Octal base
42A1 (141 Ω), 49A1 (162 Ω), 55A1 (183 Ω), 80A1 (266 Ω), 86A1 (287 Ω), 92A1 (308 Ω) – Straight ballast resistors used in areas with a stable power grid, Octal base
42A2, 49A2, 55A2, 80A2, 86A2, 92A2 – Straight ballast resistors with tap for 2 pilot lamps
42B2, 49B2, 55B2, 80B2, 86B2, 92B2 – Straight ballast resistors with tap for 1 pilot lamp
46B1 – 46.1 V Barretter, UY5 base, to stabilize against mains voltage fluctuations
50A2 (with tap for 2 pilot lamps), 50B2 (with tap for 1 pilot lamp) – 50 V Barretter, UX4 base, to stabilize against mains voltage fluctuations
58HE7 – 6HE7, 12HE7 or 38HE7 Compactron Booster/damper/efficiency diode + beam power pentode with a 58 V heater
More of these tubes are listed as equivalents under M-P P - 300 mA heater
7KZ6 – Power pentode used as CRT cathode driver, 7.3 V heater, Noval base
8AC10 – 6AC10, 12AC10A Triple triode with an 8.4 V heater
8B10 – 6B10 Dual diode + dual triode with an 8.5 V heater
8CG7/8FQ7 – 6CG7/6FQ7, 12FQ7 Dual triode with an 8.4 V heater
8CN7 – 6CN7 Dual common cathode diode + triode used as reactance tube or combined sync sep/clipper/amplifier/phase detector, center-tapped 225 mA/8.4 V resp. 450 mA/4.2 V heater
9AU7 – 7AU7/XCC82 Dual triode with a center-tapped 225 mA/9.4 V resp. 450 mA/4.7 V heater
10JA8/10LZ8 – 6JA8 High-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase inverter, and CRT cathode driver, 10.5 V heater, Noval base
10JY8 – Medium-μ triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase inverter, and CRT cathode driver, 10.5 V heater, Noval base
11DS5 – 50B5 or 35B5 Beam power tetrode with an 11.2 V heater
13J10/13Z10 – 6J10/6Z10, 10Z10 Pentode + power pentode with a 13.2 V heater
14BL11 – Compactron Medium-μ triode + high-μ triode + sharp-cutoff video pentode, 14.2 V heater
14BR11 – Compactron Medium-μ triode + high-μ triode + frame-grid, sharp-cutoff video pentode, 14.2 V heater
17D4 – 6DA4/6DM4 Booster/damper/efficiency diode with a 16.8 V heater
17LD8 – Medium-μ triode + power pentode used as CRT vertical deflection oscillator+amplifier, 16.8 V heater, Neonoval base
33GY7 – Compactron Booster/damper/efficiency diode + beam power pentode, 33.6 V heater
38HE7, 38HK7 – 6HE7, 12HE7, 53HK7 or 58HE7 Compactron Booster/damper/efficiency diode + beam power pentode with a 37.8 V heater
42KN6 – 6KN6 Beam power pentode with a 42 V heater
More of these tubes are listed as equivalents under M-P L - 450 mA heater
26A6 – Remote-cutoff RF pentode, 26.5 V/70 mA heater, Miniature 7-pin base
26A7-GT – 2×2 W Dual low (26.5-50 V) anode voltage AF beam power pentode used as a push–pull audio amplifier, designed for both anode and 26.5 V/600 mA heater to run directly off the standard avionics 28-volts DC bus, Octal base; cf. 13П1С, Shuguang 13P1P
26BK6, 26C6 – Common cathode dual diode + high-μ AF triode, Miniature 7-pin base; 6BK6 or 12BK6 with a 26.5 V/70 mA heater
26D6 – Heptode pentagrid converter with American grid topology, Miniature 7-pin base; 6BE6/EK90 with a 26.5 V/70 mA heater and reduced-specs minimum anode voltage 26.5 V
26E6-G = 26E6-WG – 12.5 W Avionics AF beam power pentode, 26.5 V/300 mA heater, Octal base
26Z5-W – Avionics dual 1.375 kV, 300 mA rectifier with separate cathodes used as a voltage doubler, 26.5 V/200 mA heater, Noval base
28D7-W – 2×3 W Dual low (28-100 V) anode voltage AF beam power pentode used as a push–pull audio amplifier, or as switching element of a self-excited push–pull DC/DC converter to provide up to 725 mW of anode high voltage supply for conventional tubes, both anode and 28 V/400 mA heater run off the avionics 28-volts DC bus, shock resistant up to 350 g, Loctal base
4AP10 – 4 in (10 cm) Skiatron, a CRT where the conventional light-emitting Phosphor layer is replaced with a scotophor such as KCl, which has the property that when a crystal is struck by an electron beam, it would change from translucent white to a dark magenta, and when flooded with high-intensity infrared, or by electro-thermal heating, would change back to translucent white.[104]: 2 It therefore needs backlighting or external illumination like today's electronic paper[105][106]
4DP1, 4DP2, 4DP7, 4DP11 – Dual-beam 4" CRT used in oscilloscopes, electrostatic deflections
5AZP4 – 5 in (13 cm) Projection CRT, 40 kV anode voltage, considerable X-radiation, 50° magnetic deflection, P4 white, medium-persistence, 7-pin Duodecal base, casts an 8 ft × 6 ft (2.4 m × 1.8 m) image
5BP1 (1802-P1) – 5" CRT used in pre-World War II oscilloscopes, electrostatic deflection, P1 green, medium-persistence[108]
5BP3 (1802-P3) – 5" Pre-World War II CRT, electrostatic deflection, P3 yellow, medium-persistence[108]
5BP4 (1802-P4) – 5" CRT used in pre-World War II television receivers, such as the RCA TRK-5 and in early radars such as the SCR-268 and SCR-270,[109] electrostatic deflection, P4 white, medium-persistence[108]
5CEP11 (blue, short); 10VP15, 5AKP15, 5DKP15, 5ZP15 (blue-green, extremely short); 5BNP16, 5CEP16, 5DKP16, 5ZP16 (violet/near-ultraviolet, very short); 5AKP24, 5AUP24, 5DKP24, 5ZP24 (green, short) – CRT-type flying-spot scanners used in telecines
5TP4 – 5" Projection CRT, 27 kV anode voltage, considerable X-radiation, 50° magnetic deflection, P4 white, medium-persistence, 7-pin Duodecal base
6DP1, 6DP2, 6DP7, 6DP11, 6DP14 (purple/orange, medium/long), 6DP19 (orange, long), 6DP25 (orange, very long) – 6 in (15 cm) Triple-beam CRT used in oscilloscopes, electrostatic deflections
7JP1 – 7 in (18 cm) CRT used in early postwar oscilloscopes, electrostatic deflection, P1 green, medium-persistence, 12-pin Diheptal (JEDEC B12-37) base[111]
7JP4 – 7" CRT common in early postwar TV receivers, electrostatic deflection, P4 white, medium-persistence, 12-pin Diheptal (JEDEC B12-37) base[111]
7JP7 – 5+1⁄2 in (14 cm) (usable screen diameter) CRT used in early postwar radar displays, electrostatic deflection, P7 blue/yellow, short/long-persistence, 12-pin Diheptal (JEDEC B12-37) base[111]
7NP4 (60 ft (18 m) projection distance), 7WP4 (80 ft (24 m) projection distance) – 7" Forced-air cooled, tir-cooled, theatric projection CRTs, 75 kV anode voltage, considerable X-radiation, 35° magnetic deflection, P4 white, medium-persistence, Diheptal 14-pin base, cast a 20 ft × 15 ft (6.1 m × 4.6 m) image
40A1, 40B2 (Octal base), 50A1 (Noval base) – Barretters used as cathode resistors of horizontal-deflection output tubes in early TV receivers to stabilize the picture width against mains voltage fluctuations
45Z3 – Half-wave rectifier used in Three-way portable (AC or DC mains, or batteries) radio receivers, 45 V/75 mA heater, Miniature 7-pin base
46A1 – 46.1 V, 400 mA Barretter, UY5 base, to stabilize against mains voltage fluctuations
315 mA series heater tubes
16BQ11 – Compactron Remote-cutoff pentode + sharp-cutoff IF pentode, 16 V heater
16BX11 – Compactron Medium-μ triode + high-μ triode + sharp-cutoff video pentode, 16 V heater
18AJ10 – Compactron Dual-control pentode + AF power pentode, 18 V heater
24BF11 – Compactron Dual-control, sharp-cutoff pentode + beam power pentode, 24.2 V heater
24JZ8 – Compactron Medium-μ triode + beam power tetrode used as CRT horizontal deflection amplifier, 24.2 V heater
31AL10 – Compactron High-μ triode + medium-μ triode + beam power tetrode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT vertical deflection oscillator+amplifier, 31.5 V heater
32HQ7 – Compactron High-perveance CRT horizontal deflection output booster/damper/efficiency diode + beam power pentode, 32.6 V heater
53HK7 – Compactron Booster/damper/efficiency diode + beam power pentode, 53.2 V heater
1D21 – 300 V, 50 mAavg, 5 ApeakStrobotron Neon, luminescent, pulsed arc-discharge tetrode thyratron used as a stroboscope lamp, dual two-quadrant control grid (tube triggers with a positive or a negative pulse on either grid)
1L38 = 8047 – 50 pF, 7.5 kV Vacuum capacitor
1N23 – Silicon point contact diode used in early radar mixers
1S22 – 10 kV, 20 A Vacuum SPDT switch actuated by a lever extending through a flexible Kovar diaphragm
2A21 (6.5-9.5 V/1 A), 2A22 (3-8 V/1.7 A) – Ballast tubes, Octal base
2B22 – 1.5 GHz Lighthouse-type Disk-seal diode, 6.3 V/750 mA heater, Octal base
2B23 – Indirectly heated, magnetically controlled diode. An external, variable magnetic field from a solenoid spirals the electron stream away from the anode like in a Magnetron, driving the tube into cut-off with a sensitivity of -2 mA/G (-20 mA/mT), 6.3 V/300 mA heater, Octal base[114]
2B25 – 2.8 kV, 1.5 mA Half-wave rectifier, 1.4 V/110 mA filament, Miniature 7-pin base
2B35/EA50 – Subminiature video detector diode, 6.3 V/150 mA heater, 3+1-pin all-glass with anode on top pin
2C21 = 1642 – Separate cathodes dual RF triode, 6.3 V/600 mA heater, Micanol U7A base, one grid on top cap
2C22 = 7193 – 3.3 W VHF Power triode, 6.3 V/300 mA heater, Octal base, grid and anode on separate top caps
2C26, 2C26A (Pulse-rated) – 10 W, 300 MHz Power triode, 6.3 V/1.1 A heater, Octal base, grid and anode on separate top caps
2C33 – 1.25 kV, 25 mAavg, 1.5 Apeak Argon triode thyratron, negative control characteristic, 2.5 V/2.5 A filament, Octal base
2C34 – 2×5 W, 80 MHz Dual power triode, 6.3 V/600 mA heater, Octal base with two anode top caps
2C36 – 1.75 GHz Rocket-type Disk-seal triode with an internal feedback circuit between cathode and anode used as UHF oscillator, 6.3 V/400 mA heater
2C37 – 3.3 GHz Rocket triode used as SHF oscillator, 6.3 V/400 mA heater
2G21 (Long wire-ends), 2G22 (short wire-ends) – Subminiature, low (22.5-45 V) anode voltage triode/heptode oscillator/mixer, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 7 inline wire-ends
2H21 – Phasitron, a magnetically controlled beam deflection phase modulator tube used in early FM broadcast transmitters, 6.3 V/300 mA heater, Magnal 11-pin base;[115] superseded by 5593[116][117][118]
2K40 – 30 mW, 5-10 GHz Reflex Klystron, 6.3 V/330-390 mA heater, 3-pin PeeWee base
2K45 – 30 mW, 8.5-9.66 GHz Reflex Klystron with thermal tuning - one wall of the cavity is also the anode of a triode, so increasing the triode current results in thermal expansion of that wall, altering the cavity geometry, 6.3 V/760 mA heater
2K50 = Bendix TK-4 – 15 mW, 23.5-24.5 GHz Reflex Klystron, 6.3 V/705...805 mA heater, Octal base
2K51 (2.7-3.3 GHz), 2K52 (2.9-3.7 GHz), 2K53 (3.2-4 GHz) – 2-Cavity Klystrons, 6.3 V/1.4 A heater, Octal base
2K56 – 3.84-4.46 GHz Reflex Klystron, 6.3 V/440 mA heater, Octal base
2K57 – 4.82-5.12 GHz Reflex Klystron, 6.3 V/1.5 A heater, Octal base
2P21 (1.6 in (41 mm)), 2P22 (1 in (25 mm)), 2P23 (3 in (76 mm)) – Early Image Orthicon video camera tubes, 6.3 V/600 mA heater, Diheptal 14-pin base
3B23 – 3.5 kV, 2×600 mA Full-wave rectifier, half-indirect 2.5 V/8 A heater, UX4 Bayonet base with dual anode top cap
3B24 = Western Electric 732A – 20 kV, 60 mAavg, 300 mApeak Half-wave rectifier, center-tapped 2.5 V/6 A resp. 5 V/3 A filament, UX4 Bayonet base with anode on top cap; ruggedized versions: 3B24-W, 3B24-WA
3B25 – 4.5 kV, 500 mAavg, 2 Apeak Gas-filled half-wave rectifier, 2.5 V/5 A filament, UX4 Bayonet base with anode on top cap
3B26 – 15 kV, 20 mAavg, 8 Apeak Ruggedized, Nonex hard glass clipper diode, half-indirect 2.5 V/4.75 A heater, Octal base with anode on top cap
3B27 – 8.5 kV, 150 mAavg, 600 mApeak Half-wave rectifier, split-cathode half-indirect 2.5 V/5 A heater, UX4 Bayonet base with anode on top cap
3B28 – 10 kV, 250 mAavg, 1 Apeak Xenon-filled half-wave rectifier, 2.5 V/5 A filament, UX4 Bayonet base with anode on top cap; ruggedized replacement for Mercury-vapor type 866
3B29 – 16 kV, 64 mAavg, 250 mApeak Ruggedized, Nonex hard glass clipper diode, half-indirect 2.5 V/4.9 A heater, UX4 Bayonet base with anode on top cap
3C22 – 125 W, 1.4 GHz Forced-air cooled, disk-seal power triode, 6.3 V/2 A heater, Octal base
3C23 – 1.25 kV, 1.5 Aavg, 6 Apeak Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/7 A filament, UX4 Bayonet base with anode on top cap
3C24 (Grid on side pin), 3C28 (grid on dual side pin), 3C34 (grid on base pin) – 25 W, 60 MHz Power triodes, 6.3 V/3 A filament, ceramic UX4 Bayonet base with anode on top pin
3C27B, 3C37 – 10 kWpeak, 1.15 GHz Pulse-rated, coaxial power triodes, 6.3 V/2.5 A heater
3C33 – ±2 kV, 2×15 W Common cathode dual power triode used in burst- or phase-fired controllers, 12.6 V/1.125 A heater, Septar base
3C36 – 500 W, 1.5 GHz Water-cooled disk-seal power triode, 6.3 V/2.8 A heater
3C45 = 6130 – 3 kV, 45 mAavg, 1.5 ARMS, 35 Apeak Hydrogen triode thyratron, positive starter voltage, half-indirect 6.3 V/2-2.5 A heater, Micanol UX4 base with anode on top cap; ruggedized version: 3C45-W
3D21, 3D21A, 3D21B – 5 kV, 15 W Pulse-rated beam power tetrode, center-tapped 12.6 V/850 mA resp. 6.3 V/1.7 A indirect heater, Octal base with anode on top cap; ruggedized version: 3D21-WB
3K23 (5 W, 950-1150 MHz), 3K27 (3 W, 750-960 MHz) – Reflex Klystrons, 6.3 V/1.5 A heater, Octal base
4A21 – 11-15 V/1.59-1.65 A Ballast tube, Octal base
4B22 = EL5B – 340 V, 5 A Argon-filled full-wave rectifier, 2.5 V/11-13 A filament, E39 MogulEdison screw lamp base with Graphite anodes on top pins
4B23 = EL5BHD – 425 V, 5 A Heavy-duty Argon-filled full-wave rectifier, 2.5 V/16-18 A filament, E39 Mogul Edison screw lamp base with Graphite anodes on top pins
4B24 = EL3C – 725 V, 2.5 A Argon-filled full-wave rectifier with Graphite anodes, 2.5 V/10.5-12.5 A filament, 4-pin base
4B25 = EL6CF – 725 V, 6.4 A Argon-filled full-wave rectifier with Graphite anodes, 2.5 V/16-18 A filament, 4-pin base
4B26 = 2000 – 375 V, 6 A Gas-filled half-wave rectifier, 2.2 V/18 A filament, E39 Mogul Edison screw lamp base with anode on top pin
4B27 – 1 kV, 2 A Gas-filled full-wave rectifier, 2.5 V/10 A filament, 4-pin base
4B28 – 300 V, 6 A Gas-filled half-wave rectifier, 2.2 V/17 A filament, E39 Mogul Edison screw lamp base with anode on top pin
4B31 – 15 kV, 60 mA Half-wave rectifier, half-indirect 5 VAC/5 A heater, B4D Superjumbo base with anode on top cap
4B32 = STC 2G/472B – 10 kV, 1.25 Aavg, 5 Apeak Xenon-filled half-wave rectifier, 5 V/7.25 A filament, B4F/U4J Jumbo base with anode on top cap
4B35 (90 V, 3 A), 4B36 (275 V, 2 A) – Tungar-type Gas-filled half-wave rectifier, 2 V/12 A filament, E39 Mogul Edison screw lamp base
4C21 – 100 W, 1 MHz Power triode, 10 V/3.25 A filament, B4F/U4J Jumbo base
4C25 – 50 W, 30 MHz Power triode, 5 V/5 A filament, UX4 base
4C27 = 8026 – 150 W, 600 MHz Coaxial power triode, 6 V/6.5 A filament
4C28 – 7.5 kV, 2 A Pulse modulator power triode used in small LORAN and SHORAN transmitters, 6 V/6.5 A filament
4C29 – 150 W Pulse-rated UHF power triode, 6 V/6.5 A filament
4C32 – 200 W, 60 MHz Power triode used in shortwave diathermy generators, 10 V/4.5 A filament
4C33 – 250 W, 625 MHz Forced-air cooled, pulse-rated power triode, 5 V/9.1 A heater
4C34 – 250 W, 60 MHz Power triode, 11 V/4 A filament
4C35 = Philips PL435 = Toshiba 1G35P, 4C35A – 8 kV, 100 mAavg, 90 Apeak Hydrogen triode thyratron, half-indirect 6.3 V/5.5-6.7 A heater, B4D Superjumbo base with anode on top cap
4C36 – 125 W, 60 MHz Power triode, 5 V/7.5 A filament, B4F/U4J Jumbo base
4D21 = 6155 = Eimac 4-125A – 125 W Glass VHF beam power tetrode, 5 V/6.5 A filament, B5E Giant 5-pin UY base with metal shell and anode on top cap
4D22 (Center-tapped 25.2 V/800 mA resp. 12.6 V/1.6 A heater), 4D32 (6.3 V/3.75 A heater) – 50 W, 60 MHz Beam power tetrodes, Septar base with anode on top cap
4D23 – 150 W, 120 MHz Beam power tetrode, 5 V/7.5 A filament, B5D/U5G Giant 5-pin UY base
4E27/8001 (75 W), 4E27A/5-125B (85 W) – Glass radial-beam power pentode, 5 V/7.5 A filament, B7D/U7G Giant 7-pin base with anode on top pin
5B21 – 225 V, 15 A Gas-filled half-wave rectifier, 2.5 V/25 A filament, E39 Mogul Edison screw lamp base
5B24 – 1 kV Full-wave, Mercury-vapor Tungar bulb, a low-voltage rectifier for charging 60-cell lead-acid batteries at 6 A, 2.5 V/18 A filament[121]
5C21 = C6J – 750 V, 6.4 A Xenon triode thyratron, negative control characteristic, 2.5 V/21 A heater, B4D Superjumbo base
5C22/6279, 5C22A – 16 kV, 200 mAavg, 325 Apeak Hydrogen triode thyratron used in radar modulators, half-indirect 6.3 V/9.6-11.6 A heater, B4D Superjumbo base with anode on top cap
5C30 – 750 V, 5 A Triode thyratron, negative control characteristic, 2.5 V/23 A heater, E39 Mogul Edison screw lamp base
5D21 – 60 W Beam power tetrode, 26 V/2.1 A heater, B4A Ventilated 4-pin base with anode on top terminal
5D22/6156/4-250A – 250 W, 110 MHz Glass beam power tetrode, 5 V/14.5 A filament, B5E Giant 5-pin UY base with anode on top cap
5D23 – 140 W, 45 MHz Power tetrode, 5 V/14.5 A filament, B4F/U4J Jumbo base
7C23 – 17.5 kV, 120 kWpeak, 1.2 kWavg, 5 MHz Pulse power triode, center-tapped 11 V/29 A filament
7C24/5762 = RCA 4654 – 4 kW, 30 MHz Forced-air cooled power triode, center-tapped 12.6 V/29 A filament
7C25 – 2.5 kW, 30 MHz Power triode, center-tapped 11 V/28 A filament
7C26 – 1 kW, 150 MHz Power triode, center-tapped 9 V/28 A filament
7C27 – 3 kW, 110 MHz Power triode, center-tapped 16 V/28.5 A filament
7C30 – 3 kW, 1.6 MHz Power triode, center-tapped 16 V/28.5 A filament
8C22 – 1 kW, 400 MHz Forced-air cooled, pulse-rated power triode, 4.1 V/296...344 A filament
8C23 – 1 kW, 600 MHz Forced-air cooled, pulse-rated power triode, 4.1 V/296...344 A filament
8D21 – 2×3 kW, 216 MHz Internally water-cooled dual power tetrode used in early VHF TV transmitters, 3.2 V/125 A filament
9C21 (Water+forced-air-cooled, 40 kW), 9C22 (Forced-air cooled, 20 kW) – Power triodes, 19.5 V/415 A filament, 4-pin base and flanged-header grid terminal around the tube
9C24 – 5 kW, 220 MHz Water-cooled, ceramic/metal power triode used in grounded-grid amplifiers, 6.3 V/240 A filament; superseded by 6039
9C25 – 11.5 kW, 30 MHz Forced-air cooled beam power triode, 6.0 V/285 A filament, 2-pin base and flanged-header grid terminal
9C26 – 7.5 kW Forced-air cooled power triode, 6.0 V/285 A filament, 2-pin base and flanged-header grid terminal
9C27 – 25 kW, 30 MHz Water+forced-air cooled power triode, 6.0 V/285 A filament, 2-pin base and flanged-header grid terminal
Many of these are special quality versions of the equivalents given. Some manufacturers preceded the EIA number with a manufacturer's code, as explained above
5512 – 25 kW, 110 MHz Water-cooled, coaxial power triode with integral water jacket, 6.2 V/435 A filament
5513 – 1.2 kW, 220 MHz Forced-air cooled, glass/metal, coaxial power triode, 6.3 V/30 A filament
5514 – 65 W RF Power triode with a Zirconium-coated Graphite anode on top cap, 7.5 V/3 A filament, UX4 base
5516 – 15 W, 80 MHz Beam power pentode, Zirconium-coated anode on top cap, Gold-coated control grid, "carbonized" screen grid, center-tapped 6 V/700 mA oxide-coated quickstart filament, Micanol Octal base
5517 – 2.8 kV, 12 mA Gas-filled, cold-cathode, triggerable half-wave rectifier used in photoflash power supplies, Miniature 7-pin base with anode on top cap
5518 – 4 kW, 110 MHz Forced-air cooled, glass/metal, coaxial power triode, 6.3 V/235 A filament
5527 – 2 in (51 mm) Iconoscope, 6.3 V/600 mA heater, 12-pin Diheptal base
5528 – 500 V, 6.4 A Xenon triode thyratron, 2.5 V/21 A filament, 4-pin base with anode on top cap
5530 (110 MHz), 5530H (30 MHz) – 4 kW Forced-air power triode, 5 V/55 A filament
5531 – 10 kW, 30 MHz Forced-air cooled power triode, 5.3 V/92 A filament
5541 – 10 kW, 110 MHz Forced-air cooled power triode, 7.3 V/57 A filament
5545 = STC 3G/501A – 1.5 kV, 6.4 A Gas-filled triode thyratron, negative control characteristic, 2.5 V/21 A filament, B4D Superjumbo base with anode on top cap
5549 – 4 kW, 50 MHz Forced-air cooled power triode, 12.6 V/57 A filament
5556 – 10 W, 6 MHz Power triode, 4.5 V/1.1 A filament, UX4 Bayonet base
5557 – 2.5 kV, 500 mA Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/5 A filament, UX4 Bayonet base with anode on top cap
5558 – 5 kV, 2.5 A Mercury-vapor half-wave rectifier, half-indirect 5 V/4.5 A heater, UX4 Bayonet base with anode on top cap
5559 – 1 kV, 2.5 A Mercury-vapor triode thyratron, half-indirect 5 V/4.5 A heater, UX4 Bayonet base with anode on top cap
5560 – 1 kV, 2.5 A Mercury-vapor tetrode thyratron, half-indirect 5 V/4.5 A heater, UX4 Bayonet base with anode on top cap
5561 – 3 kV, 6.4 A Mercury-vapor, half-wave rectifier, 5 V/10 A heater, B4D Superjumbo base with anode on top cap
5562 – Power pentode, center-tapped 6 V heater, UX4 base with anode on top pin
5563 (10 kV), 5563A (15 kV) – 1.8 A Mercury-vapor triode thyratron, negative control characteristic, 5 V/10 A heater, B4F/U4J Jumbo base with anode on top cap
5575/100 (20 V/24 A filament, 1 A anode current), 5576/200 (20 V/32 A filament, 2.5 A) – 150 kV Radiation-cooled half-wave rectifier
5588 – 200 W, 1 GHz Forced-air cooled, coaxial power triode, half-indirect 6.3 V/2.5 A heater; superseded by 6161
5589 = Western Electric 376B – 275 V, 20 mA (10000h lifespan), 35 mA (1000h), 200 mA (10h) Gas-filled, cold-cathode triode thyratron with a starter anode, 6-pin Octal base
5590 = Western Electric 401A (Long-life 6AK5/EF95), 5591 = 403B – VHF Pentodes, 6.3 V/150 mA heater, Miniature 7-pin base
5592 – Forced-air cooled power triode, 11 V/412 A heater, special 4-pin base
5593 – Phasitron, a magnetically controlled beam deflection phase modulator tube used in early FM broadcast transmitters, 6.3 V/300 mA heater, Magnal 11-pin base;[122] derived from the 2H21[116][117][118]
5594 – 5 kV, 500 mA Gas-filled triode thyratron, negative control characteristic, 2.5 V/5 A filament, UX4 Bayonet base
5603 = Western Electric 398A – Power pentode, 6.3 V/500 mA filament, Octal base
5604, 5604A (Forced-air cooled, 10 kW), 5619 (water-cooled, 20 kW) – 25 MHz Power triode, 11 V/176 A filament
5618 – VHF Power pentode, center-tapped 6 V/230 mA resp. 3 V/460 mA heater, Miniature 7-pin base
5632 = EEV C3J = ELC3J – 1.25 kV, 2.5 A Xenon triode thyratron, negative control characteristic, center-tapped 2.5 V/9 A heater, UX4 Bayonet base with anode on top cap
5652 (For AC use with balancing capacitor), 5653 (for DC use) – High-vacuum, side-on, S4 phototubes, 5-pin Octal base
5654/6096/6AK5-W/E95F, CV4010 – Avionics version of 6AK5/EF95 sharp-cutoff pentode, popular in vintage radar IF amplifiers; 20 V/50 mA heater version: Western Electric 6028/408A
5655 – 1.6 in (41 mm) Image Orthicon, magnetic focus and deflection, 6.3 V/600 mA heater, Diheptal 14-pin base
5656 – 2×3 W, 400 MHz Dual power tetrode, 6.3 V/400 mA heater, Noval base
5658 – Upgraded drop-in replacement for the 880 power triode used for industrial, RF dielectric heating
5659 – Ruggedized 12A6 beam power tetrode
5660 – Ruggedized 12C8 dual diode + pentode
5661 – Ruggedized 12SK7 pentode
5662 – 2.25 A Triode thyratron for electric blanket controllers, 6.3 V/150 mA heater, Miniature 7-pin base
5663 – Tetrode thyratron, 6.3 V/150 mA heater, Miniature 7-pin base; similar to 5696/EN92, 546
5664 = EEV ELC1B/A – 1.25 kV, 1 A Xenon triode thyratron with a Tantalum anode, negative control characteristic, 2.5 V/6.3 A filament, UX4 Bayonet base with anode on top cap
5665 = EEV C16J – 1.25 kV, 16 A Xenon triode thyratron, negative control characteristic, 2.5 V/31 A filament
5666 (Water-cooled, 12.5 kW), 5667 (forced-air cooled, 7.5 kW) – Upgraded replacements for the 889A, 889RA power triodes used for industrial, RF dielectric heating
5668 (Water-cooled, 20 kW), 5669 (forced-air cooled, 10 kW) – Upgraded replacements for the 892, 892R power triodes used for industrial, RF dielectric heating
5670 – 800 MHz Dual medium-μ triode with separate cathodes, 6.3 V/350 mA heater, Noval base; avionics version: 5670-WA; similar to 2C51 or 6385
5671 – 25 kW, 10 MHz Forced-air cooled power triode, 11 V/285 A filament
5672 – Subminiature power pentode, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
5674 – Directly heated dual, compensating electrometerspace charge grid tetrode for use in the 2 branches of a differential-in, differential-out bridge circuit, 3.8 V/90 mA filament, U6A base
5675 – 5 W, 1.7 GHz Pencil-type glass/metal medium-μ triode, derated up to 3 GHz, 6.3 V/135 mA heater
5676 – Subminiature VHF triode, 1.25 V/120 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
5677 – Subminiature UHF triode, 1.25 V/60 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
5678/DF60 – Subminiature, shielded RF pentode with a split suppressor grid, its halves tied to the positive resp. negative 1.25 V/50 mA filament end, all-glass elliptical cross-section envelope with 5 long inline wire-ends
5679 – Dual diode, 6.3 V/150 mA heater, Loctal base
5680 – 2.5 kW, 30 MHz Forced-air cooled power triode, 13 V/36 A filament
5681 – 75 kW, 30 MHz Water-cooled power triode with coaxial terminals, 12 V/220 A filament
5682 – 140 kW, 30 MHz Water-cooled power triode with coaxial terminals, 16.5 V/325 A filament
5683 – 1.25 kV, 1 A Gas-filled triode thyratron, negative control characteristic, 2.5 V/6.3 A filament, UX4 Bayonet base
5684 = EEV C3J/A = ELC3J/A – 1.25 kV, 2.5 A Xenon triode thyratron, negative control characteristic, center-tapped 2.5 V/9 A filament, UX4 Bayonet base with anode on top cap; improved 5632
5685 = EEV C6J/A = ELC6J/A – 1.25 kV, 6.4 A Xenon triode thyratron, negative control characteristic, 2.5 V/21 A filament, B4D Superjumbo base with anode on top cap
5686 – 8.25 W, 160 MHz Ruggedized beam power tetrode, 6.3 V/350 mA heater, Noval base
5687 – Dual medium-μ triode with separate cathodes, center-tapped 12.6 V/450 mA resp. 6.3 V/900 mA heater, Noval base; avionics version: 5687-WA
5690 – 1.12 kV, 2×375 mA Dual rectifier with separate cathodes and separate 6.3 V/1.2 A (each) heaters, Octal base
5691 – Special Red ruggedized, long-life version of 6SL7-GT dual high-μ triode
5692 – Special Red ruggedized, long-life version of 6SN7-GT dual medium-μ triode, extensively used in the SAGE computer systems
5693 – Special Red ruggedized, long-life version of 6SJ7 sharp-cutoff pentode
5694 – Pre-aged 6N7-G dual high-μ triode, Octal base
5695 – 5 kV, 150 mA Mercury-vapor half-wave rectifier, 2.5 V/3 A filament, UX4 Bayonet base
5696/EN92 (5663, 546) – 500 V, 25 mAavg, 100 mApeak, 2 Asurge Xenon tetrode thyratron, negative control characteristic, for industrial control systems, 6.3 V/150 mA heater, Miniature 7-pin base
5697 – Subminiature triode, 625 mV/20 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
5702 – Subminiature, dual-control pentode, 6.3 V/200 mA heater, all-glass round cross-section envelope but 7 long inline wire-ends; ruggedized versions: 5702-WA, 5702-WB = 6148
5703 – Subminiature UHF triode, 6.3 V/200 mA heater, all-glass round cross-section envelope with 5 long wire-ends; ruggedized versions: 5703-WA, 5703-WB = 6149
5704 – Subminiature diode, 6.3 V/150 mA heater, all-glass round cross-section envelope, but 4 long inline wire-ends; ruggedized version: 5704-WA
5705 – 10 kW, 30 MHz Water-cooled power triode, 22 V/60 A filament
5710 – 5 kW, 20 MHz Forced-air cooled power triode, 10 V/420 A filament
5725/6187/6AS6-W, 7752 (Different pinout) – Avionics version of 6AS6 sharp-cutoff pentode
5726 = 6097 = 6AL5-W = E91AA/EAA901S – Ruggedized dual RF diode, Silicon-free 6.3 V/300 mA heater, Miniature 7-pin base
5727/E91N = 2D21-W – Up to 750 g shock resistant 2D21
5728 = FG-67 – 1 kV, 2.5 A Mercury-vapor triode thyratron, half-indirect 5 V/4.5 A heater, UX4 Bayonet base with anode on top cap
5729 – Beam deflection, 30-channel analog multiplexer for telecomms transmitting channel banks, internal electrostatic focusing and deflection to determine through which one out of 30 grids the electron beam passes to the common anode, 6.3 V/450 mA heater, 42-pin base;[123] cf. 5738, 6090, 6091, 6170, 6324
5730 – Cyclophon, a beam deflection, 30-channel analog demultiplexer for telecomms receiving channel banks, internal electrostatic focusing and deflection to determine which one out of 30 anodes receives the electron beam controlled by a common grid, 6.3 V/450 mA heater, 42-pin base
5734, 5734A – Mechanotron-type mechano-electronic displacement sensor - a vacuum triode with its anode mounted on a shaft that extends through a thin, flexible metal diaphragm, shaft movement is reflected in anode current, Fres = 12 kHz, 6.3 V/150 mA heater, metal envelope, circular 4-pin/wire-ends[124][125][71]
5736 – 2.5 kW, 60 MHz Forced-air cooled power triode, 6 V/60 A filament
5737 – 150 kW, 20 MHz Water-cooled power triode, 25 V/650 A filament
5738 – Cyclophon, a beam deflection, secondary emission, 25-channel analog multiplexer, internal electrostatic focusing and deflection to determine which one out of 25 individually controllable dynodes receives the electron beam controlled by a common grid, 6.3 V/600 mA heater, 12-pin Diheptal (electron gun) plus JEDEC B26-53 26-pin (dynodes) bases;[126] cf. 5729, 6090, 6091, 6170, 6324
5741 – 20 kV, 20 mA Radiation-cooled half-wave rectifier, 10 V/5 A filament, UX4 Bayonet base with anode on top cap
5750 – Ruggedized 6BE6/EK90 heptode pentagrid converter, shock resistant up to 450 g
5751 – Dual low-noise, high-μ triode with separate cathodes, center-tapped 12.6 V/175 mA resp. 6.3 V/350 mA heater, Noval base; avionics version: 5751-WA
5755 – Ruggedized, low microphonics, low-drift, separate cathodes dual triode used as precision DC amplifier in stabilized DC power supplies and analog computers, center-tapped 12.6 V/180 mA resp. 6.3 V/360 mA heater, Noval base
5759 – 1 kW, 150 MHz Forced-air cooled power triode, center-tapped 7.5 V/24 A filament
5760 (Water-cooled), 5761 (Forced-air cooled) – 1.5 kW, 150 MHz power triode, center-tapped 7.5 V/24 A filament
5762/7C24 = RCA 4654, 5762A – 4 kW, 30 MHz Forced-air cooled power triode, center-tapped 12.6 V/29 A filament
5763 (6.0 V/750 mA heater), 6417 (12.6 V/375 mA heater) – 12 W, 175 MHz Beam power tetrode, Noval base
5794, 5794A/6562 – 600 mW, 1.68 GHz Pencil-type power triode fixed-tuned oscillator assembly with integral cathode and anode cavity resonators used in Radiosonde weather balloon transmitters, 5.2-6.6 V/160 mA heater
5812 – 10 W, 165 MHz Beam power pentode, center-tapped 6 V/650 mA oxide-coated quickstart filament, Miniature 7-pin base
5813 – 1.8 in (46 mm) Slow scan video camera tube, 6.3 V/600 mA heater
5814, 5814A – Ruggedized, industrial/computer-rated version of 12AU7/ECC82 dual medium-μ triode with a Silicon-free, center-tapped 12.6 V/175 mA resp. 6.3 V/350 mA heater; avionics versions: 5814-WA, 5814-WB
5817 (4.8-5 GHz), 5818 (5-5.2 GHz) – 1.6 W Forced-air cooled Reflex Klystrons used in microwave radio relais, 6.3 V/1.5 A heater
5819 – 2 in (51 mm), 10-Stage, head-on, S9 photomultiplier, Diheptal 14-pin base
5820, 5820A, 5820A/L (Longer-life, non-deteriorating glass target) – 1.8 in (46 mm) Image Orthicon, 6.3 V/600 mA heater, Diheptal 14-pin base
5821 – 1.2 kV, 9 A Water-cooled Ignitron
5822, 5822A – 1.2 kV, 20 A Water-cooled Ignitron
5823/Z900T – 200 V, 25 mAavg, 100 mApeak Gas-filled, cold-cathode AC trigger triode, Miniature 7-pin base
5824 – Premium version of 25B6-G power pentode
5825 – 60 kV, 2 mA Half-wave rectifier, 1.6 V/1.25 A heater, UX4 base with anode on top cap
5826 – 1.6 in (41 mm) Image Orthicon, magnetic focus and deflection, 6.3 V/600 mA heater, Diheptal 14-pin base
5828 – Subminiature medium-μ triode, 1.25 V/10 mA filament
5829-WA – Ruggedized, subminiature avionics separate cathodes dual diode, 6.3 V/150 mA heater, all-glass round cross-section envelope with 7 long wire-ends
5831 – 150 kW Super-Power water-cooled beam power triode, 6 V/2.22 kA heater
5833 – 35 kW, 6 MHz Forced-air cooled power triode, 3-phase filaments internally star-connected with center/neutral available, 20 V/143 AY each
5834 = 649 (2.5 V/7 A filament, 2 A anode), 5835 = 653 (2.5 V/9.5 A filament, 3 A anode) – 900 V Half-wave Mercury-vapor rectifiers, UX4 Bayonet base
5836Raytheon RK5836 – 250 mW, 1.6-6.5 GHz Reflex Klystron, 6.3 V/750 mA heater, 4-pin PeeWee base with external-cavity contact rings and top cap; pulse-rated variant of type 6BL6
5837 – 150 mW, 0.55-3.8 GHz Reflex Klystron, 6.3 V/675 mA heater, 4-pin PeeWee base with external-cavity contact rings and top cap; pulse-rated variant of type 6BM6
5838 = Bendix TE-3 (12.6 V/600 mA heater), 5839 = TE-2 (26.5 V/255 mA heater), 5852 = TE-5 (6.3 V/1.2 A heater) – Ruggedized, pre-aged 6X5/EZ35 full-wave rectifier
5841 – 900 V Subminiature Corona voltage-regulator tube
5842 = Western Electric 417A = CSF F7004 – Medium-μ triode used in grounded-grid amplifiers, 6.3 V/300 mA heater, Noval base; not to be confused with the 7004=TBL2/300 RF power triode
5844 – Dual medium-μ triode, 6.3 V/300 mA heater, Miniature 7-pin base
5845 = Bendix TT-30 – Directly heated, dual 300 V, 1 mA thermally-limited (=saturated) emission diode used as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, or as an RMS heating current-to-DC anode current converter, or as a noise diode, center-tapped 5 V/435 mAmax uncoated Tungsten filament, Miniature 7-pin base
5846 – 9.28 GHz Reference microwave cavity
5847 = Western Electric 404A, 5847A – Frame-grid sharp-cutoff pentode, 6.3 V/300 mA heater, Noval base
5851 – Ruggedized, subminiature 400 MHz beam power pentode, center-tapped 2.5 V/55 mA resp. 1.25 V/110 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends
5852 – See 5838
5853 – TR cell
5854 – 0.8 in (20 mm) Image Iconoscope, 6.3 V/630 mA heater
5875 – Subminiature sharp-cutoff pentode used in Radiosonde weather balloon transmitters, 1.25 V/100 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
5876, 5876A – 6.25 W, 1.7 GHz Ruggedized, Pencil-type, glass/metal, disk-seal, high-μ power triode, 6.3 V/135 mA heater
5877 (2.5 V/10.8 A filament, 3.2 A anode), 5878 (2.5 V/21 A filament, 6.4 A) – 1.5 kV Gas-filled triode thyratrons, negative control characteristic, 4-pin base with anode on top cap
5879 – Low microphony, low-noise, low-hum, sharp-cutoff AF pentode, 6.3 V/150 mA heater, Noval base
5881 – Ruggedized 6L6 AF beam power tetrode with 20% higher anode and screen grid dissipation
5889 – Subminiature electrometer pentode, 12 V anode voltage, 1.25 V/7.5 mA filament, 4+1-pin/wire-ends
5890 – 10 kV, 10 W Remote-cutoff beam power pentode used as 500 µA shunt regulator, 6.3 V/600 mA heater, 7-pin Duodecal base with anode on top cap
5891 – 25 kW, 10 MHz Forced-air cooled power triode, 3-phase filaments internally star-connected with center/neutral available, 11 V/95 AY each
5892 = EL6B – 920 V, 6.4 A Xenon-filled, half-wave rectifier with a Tantalum anode on top cap, 2.5 V/21 A filament, 4-pin base
5893 – Pencil-type, glass/metal, medium-μ triode, 6.0 V/280 mA heater
5894, 5894B = 8738 – 2×20 W, 250 MHz Dual beam power tetrode, center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater, Septar base with anodes on top pins
5895 – 2×8 W, 186 MHz Dual power tetrode, 6.3 V/680 mA heater, Loctal base
5896 (6.3 V/300 mA heater), 5903 (26.5 V/75 mA heater) – Subminiature separate cathodes dual diode, all-glass round cross-section envelope, circular 8-pin/wire-ends
5902/EL71 – Ruggedized, subminiature AF beam power pentode, 6.3 V/450 mA heater, all-glass round cross-section envelope with 8 long circular wire-ends; avionics version: 5902-WA
5908 – Ruggedized, subminiature, low (26.5-55 V) anode voltage, dual-control, sharp-cutoff VHF pentode used as a gated or gain-controlled amplifier, designed for both heater and anode to run directly off the standard avionics 28-volts DC bus, 26.5 V/150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base; similar to 5784
5910 – Sharp-cutoff pentode used in Radiosonde weather balloon transmitters, 1.4 V/50 mA filament, Miniature 7-pin base
5913/6007/DL67 – Subminiature power pentode, 1.25 V/13.3 mA filament, all-glass round cross-section envelope, inline 5-pin/wire-ends
5915/EH960/EH900S, 5915A – Sharp-cutoff switching heptode used in high speed digital computer equipment, Silicon-free 6.3 V/300 mA heater, Miniature 7-pin base
5916 – 5636 Ruggedized, subminiature pentode with a 26.5 V/45 mA heater
5917 – 5 kW, 110 MHz Water-cooled power triode, 7.5 V/48 A filament
5920/E90CC – Common cathode dual triode used as a flip-flop in computers, Silicon-free 6.3 V/400 mA heater, Miniature 7-pin base
5921, 5922 – ATR cells
5923 = TBW6/6000 – 6 kW, 75 MHz Water-cooled power triode, center-tapped 12.6 V/33 A filament
5924, 5924A – 5 kW, 75 MHz Forced-air cooled power triode, center-tapped 12.6 V/33 A filament
5927 – TR cell
5929 – 4.4-5 GHz Power Traveling-wave tube, 6.3 V/2 A heater
5930 – 15 W Ruggedized AF power triode, μ = 4.2, 2.5 V/2.5 A filament, 4-pin base
5931/5U4-WG – Ruggedized full-wave rectifier, 5 V/3 A heater, 5-pin Octal base
5932/6L6-WGA – Ruggedized beam power tetrode, 6.3 V/900 mA heater, 7-pin Octal base
5933/807-W – Ruggedized beam power tetrode, 6.3 V/900 mA heater, 5-pin Octal base
5934 – 20 kV, 25 mA Half-wave rectifier, 2.5 V/6 A filament, 4-pin base with anode on top cap
5935 – Subminiature diode used in VHF voltmeters, 6.3 V/150 mA heater, all-glass wire-ended
5936 – 70 kW, 15 MHz Water-cooled power triode, 20 V/143 A filament
5962 – 700 V, 2 to 55 µA Corona voltage-regulator tube, Miniature 7-pin base with anode on top cap
5963 (Noval base), 5964 (Miniature 7-pin base, common cathode), 5965 (Noval base) – Industrial/computer-rated versions of 12AV7 dual medium-μ triode with a high zero-bias anode current and a Silicon-free, center-tapped (except 5964) 12.6 V/225 mA resp. 6.3 V/450 mA heater
6008/DF67 – Subminiature AF pentode used in hearing aids, 625 mV/13.3 mA filament, all-glass round cross-section envelope, inline 5-pin/wire-ends base
6011 = 710 – 1.5 kV, 2.5 A Gas/Mercury-vapor triode thyratron, negative control characteristic, center-tapped 2.5 V/9 A filament, 4-pin base with anode on top cap
6012 – 1.3 kV, 500 mA Gas-filled tetrode thyratron, negative control characteristic, 6.3 V/2.6 A heater, 6-pin Octal base
6013 = EL3B (UX4 Bayonet base w/filament center-tap), 6015 = EL6F (2 cables) – 920 V, 2.5 A Xenon-filled, half-wave rectifiers, Tantalum anode on top cap, 2.5 V/9 A filament
6014 = EEV C1K = ELC1K – 1.25 kV, 1 A Xenon triode thyratron, negative control characteristic, 2.5 V/6.3 A heater, UX4 Bayonet base
6017 – 1 kW, 400 MHz Forced-air cooled, ceramic/metal, coaxial power triode used in grounded-grid amplifiers, half-indirect 10 V/17 A heater
6018 – Rocket-type UHF Pulse power triode, 6.3 V/400 mA heater
6019 – 2 kW, 900 MHz Water jacket-cooled, ceramic/metal power tetrode used in grounded-grid amplifiers, half-indirect 6.3 V/24 A heater
6021/ECC70, 6021-WA (6BF7) – Ruggedized, subminiature, separate cathodes dual medium-μ UHF triode, 6.3 V/300 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
6024, 6033 (1B35A), 6034 (1B37A) – ATR cells
6026 – Subminiature RF triode used in Radiosonde weather balloon transmitters, 5.2-6.6 V/200 mA heater, all-glass round cross-section envelope, circular 5-pin/wire-ends
6027, 6027H = YJ1060 – Pulsed Magnetron; 2J42 with an additional magnet
6028 = Western Electric 408A – 5654/6096/6AK5-W/E95F 400 MHz Pentode with a 20 V/50 mA heater
6029 – Subminiature triode, 1.25 V/200 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
6039 – 7 kW, 220 MHz Water-cooled, ceramic/metal, coaxial power triode used in grounded-grid amplifiers, 5 V/78 A filament; 9C24 with a thoriated Tungsten filament consuming 74.2% less power
6042 (25 V/150 mA heater), 6180 (6.3 V/600 mA heater) – Ruggedized 6SN7-GT dual triodes
6043 = Raytheon QK159 – 2.95-3.275 GHz Reflex Klystron, 6.3 V/650 mA heater, Octal base
6044 – 500 V, 6.4 A Gas-filled triode thyratron, negative control characteristic, 2.5 V/17 A filament
6045 – Ruggedized, dual low-μ triode, 6.3 V/350 mA heater, Miniature 7-pin base
6046 – 25L6-GT Beam power tetrode with a Silicon-free heater and a low-secondary emission control grid
6047 – Additron, a triple-control grid, split-anode tetrode for use as a single-bit digital full adder, 6.3 V/150 mA heater, Noval base[127] (technically a hexode)
6049 – Ruggedized, subminiature remote-cutoff UHF pentode, 6.3 V/150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
6050 – Subminiature triode, 1.25 V/120 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
6051 – Subminiature power pentode, 1.25 V/100 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
6080 (6.3 V/2.5 A heater), 6082, 6082A = Bendix TE-55 (26.5 V/600 mA heater) – Ruggedized 6AS7-G/ECC230 very-low impedance dual power triode, now popular as output transformerless audio amplifiers in audiophile gear, μ = 2, shock resistant up to 450 g; avionics versions: 6080-WA, 6080-WB, 6080S
6081 – ATR cell
6083 = PE1/100 = YL1200 – 45 W, 60 MHz Radiation-cooled power pentode, 12.6 V/1.35 A heater, Septar base
6084/E80F – Ruggedized RF/IF/AF pentode, 6.3 V/300 mA heater, Noval base
6085/E80CC – Ruggedized, separate cathodes dual triode used as DC or AF amplifier, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
6086 = Philips 18042 – Pentode used in telephone equipment, 18 V/100 mA heater, Noval base
6087 (Half-indirect 2 A heater), 6106 = Bendix TE-22 (half-indirect 1.7 A heater), 6853 = TE-45 (pre-aged, hard glass, half-indirect 5 V/1.7 A heater) – Ruggedized 5Y3-GB full-wave rectifier
6088 – Subminiature pentode, 1.25 V/20 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
6089 – 9.28 GHz Reference microwave cavity
6090 – Cyclophon, a beam deflection, 18-channel analog demultiplexer for telecomms receiving channel banks, internal electrostatic focusing and deflection to determine which one out of 18 anodes receives the electron beam controlled by a common grid, 6.3 V/670 mA heater, 30-pin base;[128] cf. 5729, 5738, 6091, 6170, 6324
6091 – Beam deflection, 25-channel analog multiplexer for telecomms transmitting channel banks, internal electrostatic focusing and deflection to determine through which one out of 25 grids the electron beam passes to the common anode, 6.3 V/670 mA heater, 30-pin base;[129] cf. 5729, 5738, 6090, 6170, 6324
6092 – Subminiature power pentode, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
6094 = Bendix TE-18 – 12,5 W Ruggedized, hard glass 6005/6AQ5-W beam power tetrode with a 6.3 V/600 mA heater and a Noval base with Gold-plated pins
6121 – 10h lifespan, subminiature VHF triode, 1.25 V/120 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
6130/3C45 – 3 kV, 45 mAavg, 1.5 ARMS, 35 Apeak Hydrogen triode thyratron, positive starter voltage, half-indirect 6.3 V/2-2.5 A heater, Micanol UX4 base with anode on top cap
6132 – Ruggedized 6CH6/EL821 power pentode
6133 – 1.2-3.75 GHz Reflex Klystron, 6.3 V/650 mA heater, Octal base
6134 – Ruggedized 6AC7 sharp-cutoff pentode
6135 – Ruggedized 6C4/EC90 VHF triode with a 6.3 V/175 mA heater
6136 – Ruggedized 6AU6/EF94 sharp-cutoff pentode
6137 – Ruggedized 6SK7 remote-cutoff pentode
6140 – 100 V, 4 to 8 mA Voltage-regulator tube, Noval base
6141 = Western Electric 427A – 100 V, 5 to 40 mA Voltage-regulator tube with a starter anode, Noval base
6142 = Bendix TD-9A – 150 V, 75 to 400 µA Voltage-regulator tube with 2 axial leads like a resistor
6145 – Sharp-cutoff pentode used in computer equipment, 6.3 V/600 mA heater, Loctal base
6146, 6146A, 6146B/8298A (6.3 V/1.125 A heater), 6883, 6883A, 6883B/8032A/8552 (12.6 V/625 mA heater), 6159, 6159A, 6159B (26.5 V/300 mA heater) – 120 W, 60 MHz VHF/RF/AF beam power pentode, Micanol Octal base with anode on top cap
6146-W/7212 – Ruggedized 6146
6159-W/7357 – Ruggedized 6159
6147 – 1.5 W, 400 MHz Ruggedized, subminiature power pentode, center-tapped 2.5 V/62.5 mA resp. 1.25 V/125 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends
6170, 6324 – Acorn-type Beam deflection, 25-channel analog multiplexer for telecomms transmitting channel banks, external focusing and deflection by a multiphase, rotating magnetic field to determine through which one out of 25 grids the electron beam passes to the common anode;[130] cf. 5729, 5738, 6090, 6091
6193 – Subminiature variant of the 7F8-W dual triode with reduced dissipation limits, all-glass round cross-section envelope, circular 8-pin/wire-ends
6195 – Ruggedized, subminiature VHF beam power tetrode, center-tapped 2.5 V/110 mA resp. 1.25 V/220 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends
6196 – Directly heated dual, compensating electrometerspace charge grid tetrode for use in the 2 branches of a differential-in, differential-out bridge circuit, 3 V/50 mA filament, Noval base[131]
6197 – 7.5 W Power pentode used in computer equipment, Silicon-free 6.3 V/650 mA heater, Noval base
6198 – 5⁄8 in (16 mm) Vidicon, 6.3 V/600 mA heater, Ditetrar 8-pin (JEDEC E8-11) base
6199 – 1.24 in (31 mm), 10-stage, head-on, S11 photomultiplier, Duodecal 12-pin base
6201/E81CC – Ruggedized 12AT7/ECC81 dual high-μ triode with a Silicon-free heater
6202 – Ruggedized 6X4/6BX4/EZ90 full-wave rectifier, shock resistant up to 700 g
6203 – 1.25 kV, 2×270 mA Full-wave rectifier, 6.3 V/900 mA heater, Noval base
6211 – Dual medium-μ triode used in computer equipment, Silicon-free, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
6213 – 130 V, 1 to 2.5 mA Subminiature voltage-regulator tube, all-glass round cross-section envelope with 3 long wire-ends
6214 – ATR cell
6215 – 18 kV, 8 mA Half-wave rectifier, 1.25 V/200 mA filament, Octal base
6216 – 10 W Ruggedized beam power pentode, 6.3 V/1.2 A heater, Noval base
6217 – 1+11⁄16 in (43 mm), 10-Stage, head-on, S10 photomultiplier, Diheptal 14-pin base
6218/E80T – Modulated, single-anode, hexode-type beam deflection tube for pulse generation up to 375 MHz, 6.3 V/150 mA heater, Noval base, shock resistant up to 500 g;[132][133][134][135] similar to CV5724
6250 – Electrometer tetrode, 2.5 V/45 mA filament, Noval base
6251 – 25 kW Water-cooled tetrode, 5.5 V/190 A heater
6252 = QQE03/20 – 2×10 W, 200 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base with anodes on top pins
6278 – 500 V, 5 A Xenon triode thyratron, negative control characteristic, 14 V/2.5 A heater, B4D Superjumbo base with anode on top cap
6279/5C22 – 16 kV, 200 mAavg, 325 Apeak Hydrogen triode thyratron used in radar modulators, half-indirect 6.3 V/9.6-11.6 A heater, B4D Superjumbo base with anode on top cap
6280 = Western Electric 416B – 7.5 W, 4 GHz Planar power triode, 6.3 V/1.18 A heater
6281 – Subminiature low-microphonics AF pentode, 625 mV/20 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
6354 – 150 V, 5 to 15 mA Voltage-regulator tube, Miniature 7-pin base
6355 – Ruggedized dual-sensitivity top-view tuning indicator; 6AF6-G without amplifier triodes and with a Miniature 7-pin base
6356 = Bendix TD-10 – Gas-filled, directly heated noise diode for the 7.5 cm band, waveguide output, 12 VDC/170 mA heater; similar to KA561
6357 = Bendix TD-11 – Gas-filled, directly heated noise diode for the 10 cm band, waveguide output, 12 VDC/170 mA heater; similar to KA560
6358 = Bendix TD-12 – Gas-filled, directly heated noise diode for the 3 cm band, waveguide output, 10 VDC/300 mA heater; similar to KA562
6359 = Bendix TD-13 – Gas-filled, directly heated noise diode for the 1.25 cm band, waveguide output, 12 VDC/170 mA heater; similar to KA563
6360 = QQE03/12 (center-tapped 12.6 V/410 mA resp. 6.3 V/820 mA heater), 8457 = YL1210 (center-tapped 13.5 V/380 mA resp. 6.75 V/760 mA heater) – 2×5 W, 200 MHz Dual power tetrode, internally neutralized, Noval base
6361 = Bendix TT-25 – Convectron, an inclinometer tube that senses tilt from the vertical by means of different gas convections around a 4-volts heating wire in a glass envelope, of two 6361s aligned in a 90° V-shaped position to each other and the heating wires connected in a bridge circuit
6385 = Bendix TE-21 – Ruggedized dual triode, 6.3 V/500 mA heater, Noval base; similar to 2C51 or 5670
6386 – Ruggedized dual vari-μ VHF triode used as cascode amplifier or as audio compressor, Silicon-free 6.3 V/350 mA heater, Noval base
6388 = Western Electric 443A – 180 V, 7.5 mA (10000h lifespan) or 60 mA (10h lifespan) Gas-filled, cold-cathode triode thyratron, below 5 μCi (180 kBq) of 85Kr (half-life: 10.756 years) primed, Noval base
6389 – 8.69-9.41 GHz Reflex Klystron, 6.3 V/950 mA heater
6390 – 6.7-11.05 GHz Reflex Klystron, 6.3 V/580 mA heater
6394, 6394A – 2×30 W Dual power triode used as series-pass regulator in stabilized DC power supplies, 26.5 V/1.2 A heater, Octal base
6397 – Ruggedized, subminiature VHF power pentode, center-tapped 2.5 V/62.5 mA resp. 1.25 V/125 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
6441 (RCA) – 650 V, 100 mAavg, 300 mAsurgeTacitron, a grid turn-off Hydrogen thyratron with a grid that forms a shield around both the cathode and anode and separates the two by a wire mesh, so the arc discharge can be extinguished by a negative grid that surrounds the positive anode with a field of opposing polarity and inhibits conduction, taking over part of the anode current during deionisation – similar to today's GTOs, Octal base;[136] cf. EC860, 20TC4, 30TC1
6443 – High-altitude avionics, half-wave rectifier, 6.3 V/1.1 A heater, Noval base with anode on top cap
6445 – Upgraded drop-in replacement for the 892R power triode
6446 – Ruggedized 892 power triode
6447 – Ruggedized 892R power triode
6448 (26 kW), 6806 (35 kW) – 1 GHz Water+forced-air cooled linear beam power tetrode, center-tapped 2.7 V/1 kA resp. 1.35 V/2 kA resp. 2-phase (1+j)×1.35 V/1 kA thoriated Tungsten filament
6452 – 9.35 GHz Reference microwave cavity
6455 – ATR cell
6462 – Magnetic pickup tube, a 1-axis beam deflectionmagnetometer with approx. 1 G (100 μT) resolution - an electron beam is electrostatically centered between two anodes while no magnetic field is present, the magnetic field to be detected will then deflect the beam more towards one of the anodes, resulting in an imbalance between the two anode currents, 6.3 V/175 mA heater, Miniature 7-pin base[137]
6463/E86CC – Dual triode used in computer equipment, Silicon-free, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
6465 (5.95-6.4 GHz), 6466 (6.8-7.175 GHz) – 6-9 W 2-cavity Klystrons, 6.3 V/2.0 A heater, Octal base and UG344/U waveguide output
6467 – 1 in (25 mm), 10-Stage, head-on, S4 photomultiplier, Duodecal 12-pin base
6468 (6.125-6.425 GHz), 6469 (6.575-6.875 GHz), 6470 (7.125-7.425 GHz) – 0.7-1.7 W Reflex Klystrons, 6.3 V/800 mA heater
6472 – 9-Stage, side-on, S4 photomultiplier, 11-pin base
6474 = RCA 1854 – 3 in (76 mm) Image Orthicon, 6.3 V/600 mA heater, Diheptal 14-pin base
6476, 6476A – 4 kHz Neon-filled bidirectional Dekatron with 10 output cathodes, modified Duodecal base
6478 – 1.5 kVAC, 1.5 A Avionics, gas-filled triode thyratron, 2.5 V/7.5 A filament, UX4 base with anode pigtail
6482 – 4 kHz Neon-filled bidirectional Dekatron with 1 output cathode, Octal base
6483 – 500 V, 10 Apeak Ruggedized, subminiature, gas-filled, cold-cathode tetrode thyratron with a keep-alive/primer anode
6485 – 6AH6 Sharp-cutoff pentode with a Silicon-free heater
6486 = Bendix TE-11, 6486A = TE-43 – Ruggedized, pre-aged 6AS6 sharp-cutoff pentode with a 6.3 V/250 mA heater and a Noval base
6487 – Subminiature dual-control RF pentode with an integral diode internally connected to the short-base suppressor grid, 6.3 V/200 mA heater, all-glass round cross-section envelope with 8 long inline wire-ends
6488 – Subminiature RF pentode, 6.3 V/200 mA heater, all-glass round cross-section envelope with 8 long inline wire-ends
6489 – Subminiature diode, 6.3 V/150 mA heater, all-glass round cross-section envelope with 5 long inline wire-ends
6493 – 1.9-4.1 GHz Signal Traveling-wave tube, 6.3 V/1.0 A or 640-960 mA heater (conflicting datasheets), Octal base and BNC connectors
6496 – 2-4 GHz Backward-wave oscillator, 6.3 V/3.5 A heater
6498 – Memotron, a bistable direct-view storage tube for use in analog storage oscilloscopes, 6.3 V/600 mA heater, Diheptal 14-pin base[138]
6499 – Radechon, an early form of digital computer memory, 6.3 V/600 mA heater, Diheptal 14-pin plus 8-pin Twentyninar (JEDEC E8-19) bases[139][140][141]
6503 – 3.3 GHz Ruggedized 'Rocket'-type power triode for use as oscillator with an external cavity, 6.3 V/405 mA heater; supersedes 2C37
6528, 6528A – 2×30 W Dual power triode used as series-pass regulator in stabilized DC power supplies, 6.3 V/5 A heater, Octal base
6532 – Half-wave rectifier also for use as damper diode, half-indirect 4 V/4 A heater with cathode internally connected to center-tap, E40 Goliath Edison screw lamp base with anode on top cap
6660 – 20% Heater voltage fluctuation-tolerant 6BA6/EF93 remote-cutoff pentode for use in 6-volts vehicle equipment
6661 – 20% Heater voltage fluctuation-tolerant 6BH6 sharp-cutoff pentode for use in 6-volts vehicle equipment
6662 – 20% Heater voltage fluctuation-tolerant 6BJ6 remote-cutoff pentode for use in 6-volts vehicle equipment
6663 – 20% Heater voltage fluctuation-tolerant 6AL5/EAA91 dual diode for use in 6-volts vehicle equipment
6664 – 20% Heater voltage fluctuation-tolerant 6AB4/EC92 high-μ triode for use in 6-volts vehicle equipment
6669/6AQ5A – 20% Heater voltage fluctuation-tolerant 6AQ5/EL90 beam power tetrode for use in 6-volts vehicle equipment
6676 – 20% Heater voltage fluctuation-tolerant 6CB6A/6CF6/EF190 sharp-cutoff pentode for use in 6-volts vehicle equipment
6677 – 20% Heater voltage fluctuation-tolerant 6CL6 power pentode for use in 6-volts vehicle equipment
6678 – 20% Heater voltage fluctuation-tolerant 6U8A/6KD8 medium-μ triode + sharp-cutoff pentode for use in 6-volts vehicle equipment
6679 – 20% Heater voltage fluctuation-tolerant 12AT7/ECC81 dual high-μ triode for use in 6-volts vehicle equipment
6680 – 20% Heater voltage fluctuation-tolerant 12AU7A (ECC82) dual medium-μ triode for use in 6-volts vehicle equipment
6681 – 20% Heater voltage fluctuation-tolerant 12AX7/ECC83 dual high-μ triode for use in 6-volts vehicle equipment
6684 = Bendix TD-18 – 12.4-18 GHz Gas-filled noise diode for use with a RG-91/U waveguide, 12 VDC/170 mA heater
6685 – Dual TR cell
6686/E81L – 4.5 W Long-life (>10000h) power pentode used in telephone equipment, 6.3 V/375 mA heater, Noval base with Gold-plated pins
6687 – Sharp-cutoff switching heptode with American grid topology, designed for high speed digital computers, 6.3 V/270 mA heater, Miniature 7-pin base
6688/E180F, 6688A – Ruggedized, long-life (>10000h), wideband pentode, 6.3 V/300 mA heater, Noval base with Gold-plated pins
6689/E83F – Long-life (>10000h) pentode used in telephone equipment, 6.3 V/300 mA heater, Noval base with Gold-plated pins
6702 = BD401 (200-400 MHz), 6713 (0.15-30 MHz) – Beam-X Switch modified for use as a noise source by removing all but the last two spade and grid pairs, thus introducing asymmetries of the already undulated electric field inside, using the principle of random noise generation in a Magnetron-like device operated near cut-off, 6.3 V heater
6756 – 20 kW Water-cooled RF power triode, 7.5 V/100 A filament
6757 – 15 kW Forced-air cooled RF power triode, 7.5 V/100 A filament
6758 (Water-cooled), 6759 (forced-air cooled) – 6 kW, 30 MHz Power triodes, 12.6 V/33 A filament
6760 (18 V/350 mA heater), 6761 (6.3 V/1 A heater) – Power pentode, Noval base
6762 – Wamoscope ("Wave modulated oscilloscope"), a TWT/CRT combination used to directly visualize an incoming microwave signal by electron velocity-sorting, 6.3 V/900 mA heater[148]
6763 – 2.8 kV, 12 mA Ruggedized, gas-filled, cold-cathode half-wave rectifier, Miniature 7-pin base
6782 = Bendix TD-22 – 7.6-11.5 GHz Argon-filled noise diode for use in an RG-48/U waveguide, 12 V/170 mA heater
6783 – 2.5 kV, 1.6 A Gas/Mercury-vapor triode thyratron, negative control characteristic, center-tapped 2.5 V/8.5 A filament, 4-pin base with anode on top cap
6784 – 3.1-3.5 GHz Signal Traveling-wave tube, 6.3 V/370 mA heater
6786 – 15 kV, 10 A Mercury-vapor triode thyratron, half-indirect 5 V/20 A heater
6814 – Ruggedized, subminiature medium-μ triode used in computer equipment, Silicon-free 6.3 V/150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
6816 (Forced-air cooled, 6.3 V/2.1 A heater), 6884 (forced-air cooled, 26.5 V/520 mA heater), 7843 (contact/conduction-cooled, 26.5 V/520 mA heater), 7844 (contact/conduction-cooled, 6.3 V/2.1 A heater) – 115 W, 400 MHz Cermolox ceramic/metal, coaxial, linear beam power tetrodes
6826 – 2.4-3.6 GHz Pulse-rated power Traveling-wave tube, 6.3 V/4 A heater, Duodecal 12-pin base
6829 – Dual medium-μ triode used in computer equipment, Silicon-free, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base
6830 (150 V), 6831 (108 V) – 5 to 30 mA Subminiature voltage-regulator tubes
6832 – Ruggedized, subminiature, low-microphonics, separate cathodes dual medium-μ UHF triode, 6.3 V/400 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
6835 = Raytheon QK464A – Single-electron gunrecording storage tube, an analog videoframe freezer tube. This was achieved by a CRT that writes the video image onto a thin, dielectric target and subsequently can read the generated charge pattern up to 30000 times from that target, producing a video signal containing a static shot that resembles a still photograph, 6.3 V/600 mA heater, Duodecal 12-pin base[149]
6836 – 16-Stage, head-on, S1 photomultiplier with an electron lens with a defining aperture between photocathode and first dynode, allowing the photocathode area to be scanned by an external magnetic field (similar to a video camera tube), 20-pin base
6839 – S11→P11 UV to visible light, gated image intensifier used as a high-speed shutter in photography
6840 – Dual triode used in computer equipment, Silicon-free, center-tapped 12.6 V/400 mA resp. 6.3 V/800 mA heater, Noval base
6854 = Bendix TE-47 – Hard glass, dual triode, 6.3 V/500 mA heater, Noval base
6855 = 716 – 1.25 kV, 1 A Gas/Mercury-vapor triode thyratron, negative control characteristic, 5 V/1.7 A filament, UX4 Bayonet base
6856 (Pins, 2.5 V/16 A filament), 6857 (Lugs, 2.5 V/16 A filament), 6858 = 760 (Pins, 2.5 V/21 A filament), 6859 (Lugs, 2.5 V/21 A filament) – Triode thyratrons, negative control characteristic, anode on top cap
6860 = ELC6J/F – 1.25 kV, 6.4 A Gas-filled triode thyratron, negative control characteristic, 2.5 V/21 A filament, wires with lugs and Tantalum anode on top cap
6861 – 2.7-3.5 GHz Signal Traveling-wave tube, 5 V/650 mA heater, Octal base and N connectors
6864 (B4D Superjumbo base), 6871 (wires with lugs) – 1 kV, 6.4 A Xenon triode thyratron, negative control characteristic, 2.5 V/21 A filament, anode on top cap
6885, 6886 – 250 W, 3 GHz Forced-air cooled, planar, coaxial power triode, 6.3 V/2.1 A heater
6887 – Dual diode used in computer equipment, 6.3 V/200 mA heater, Miniature 7-pin base
6888 – Dual-control pentode used in computer equipment, 6.3 V/800 mA heater, Octal base
6889 = Bendix TE-52 – Ruggedized, pre-aged, hard glass beam power tetrode, 6.3 V/1.2 A heater, 5-pin Octal base with anode on top cap
6890 – ATR cell
6891 – 8.5-9.6 GHz Signal Traveling-wave tube, 5.5 V/530 mA heater, 0.4 in × 0.9 in (10 mm × 23 mm) waveguide I/O
6893 – 2E26 VHF Beam power tetrode with a 12.6 V/400 mA heater
6894 (B4F/U4J Jumbo base), 6895 (B4D Superjumbo base) – 20 kV, 1.8 A Mercury-vapor half-wave rectifier, 5 V/10 A filament, anode on top cap
6896 = RCA 1855[151], 7539,[152]7828,[153]8087,[154]8098[155] – Graphechon Dual-electron gun scan conversion display storage CRTs, dual 6.3 V/600 mA heater, analog video transcoders with simultaneous R/W capability for realtime resolution and frame rate transcoding between different analog video standards. This was achieved by a CRT/camera tube combination; the CRT part writes onto a thin, dielectric target; the camera part reads the generated charge pattern at a different scan rate from the back side of this target.[156] The setup could also be used as a genlock
6898 – 16 kV, 20 mA Half-wave rectifier also for use as clipper diode, 5 V/8 A heater, 4-pin base with anode on top cap
6900 = Bendix TE-54 – Ruggedized, hard glass, pulse-rated, pre-aged 5687 dual power triode used in missiles, avionics and industrial systems, center-tapped 12.6 V/500 mA resp. 6.3 V/1 A heater, Noval base
6901 – Long-life variant of the 393A gas/Mercury-vapor triode thyratron
6902 – 17.5-27 GHz Backward-wave oscillator, 12 V/1.2 A heater
6903 – 1+5⁄8 in (41 mm), 10-Stage, head-on, S13 (UV-sensitive) photomultiplier, Diheptal 14-pin base
6904, 6905, 6906 – TR cells
6907 – 20 W, 150 MHz Dual power tetrode, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base
6908 – 150 kV, 10 A Half-wave rectifier for immersion in oil, 12 V/23 A filament
6909 – 100 kHz Dekatron with 4 output cathodes, Octal base
6910 – 100 kHz Dekatron with 10 output cathodes, Duodecal 12-pin base
6911 – 1+1⁄2 in (38 mm), 10-Stage, head-on, dry ice or liquid air-cooled infrared-sensitive photomultiplier, Diheptal 14-pin base
6912 – Resitron Video camera tube, 6.3 V/600 mA heater
6913 – Dual triode used in high-speed computer equipment, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
6935 – 3⁄4 in (19 mm), 10-stage, head-on, S11 photomultiplier with wire-ends
6937 – Thermal neutron-detecting, ruggedized, 96% enriched, 250 mmHg (33 kPa) 10BF3-filled ionization chamber with an Aluminium envelope and a guard ring
6938 – Thermal neutron-detecting, 96% enriched, 550 mmHg (73 kPa) 10BF3-filled, multi-element proportional chamber, heavy-walled Aluminium envelope enclosing a Polyethylenemoderator block surrounding a group of individual proportional counters
6939 = QQE02/5 (center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater), 8577 = YL1220 (center-tapped 13.5 resp. 6.75 V heater) – Dual power pentode, Noval base; 7645 with a 500 MHz internal neutralization
6942 – 1.5 kW, 900 MHz Forced-air cooled, ceramic/metal, coaxial power tetrode used in grounded-grid amplifiers, half-indirect 5.7 V/23 A heater, Silver-plated external parts
6977/DM160 – First commercially available vacuum fluorescent display, side-view, single segment, used as flip-flop status indicator in transistorized computers, 1 V/30 mA filament, all-glass wire-ended; similar to ИВ-15↦IV-15; cf. 8569
6981 – Bayard–Alpert vacuum gauge
6982 (Full-wave), 6983 (half-wave) – Xenon-filled rectifiers with a Tantalum anode
7002 (Oil or other dielectric liquid-cooled, 65 kV), 7003, 7003A (Forced-air or dielectric gas-cooled, 40 kV), 7715 (Forced-air or dielectric gas-cooled, 65 kV) – 3 kW Power triode used in hard-tube pulser modulators
7004 = TBL2/300 – 2.5 kV, 300 W, 175 MHz Forced-air cooled power triode, 3.4 V/19 A filament
7018 = 615 – 2 kV, 2.5 A Half-wave Argon/Mercury-vapor rectifier, 2.5 V/6-8 A filament, UX4 Bayonet base
7019 = 635 (B4D Superjumbo base), 7020 = 635L (Lugs) – 1 kV, 6.4 A Half-wave Argon/Mercury-vapor rectifier, 2.5 V/16-20 A filament, anode on top cap
7021 = 714 – 1.25 kV, 1 A Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/4.5-5.5 A filament, UX4 Bayonet base with anode on top cap
7022 = 740L – 1.5 kV, 4 A Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/14-18 A filament, Lug connectors and anode on top cap
7023 = 760L – 1.5 kV, 6.4 A Gas/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/19-23 A filament, lugs and anode on top cap
7025, 7025A (Low microphonics) – Low-hum and noise version of 12AX7/ECC83
7027 – Upgraded 6L6 AF beam power pentode with a 25 watt anode and a different pinout, used in Hi-Fi amplifiers
7029 – 10-Stage, side-on, S17 photomultiplier, Duodecal 12-pin base
7030 – 30 kV, 6 A Forced-air cooled, half-wave rectifier, 13 V/36 A filament
7031 – 5877 Triode thyratron with a center-tapped filament
7032 – Sharp-cutoff heptode with American grid topology, used as a NAND gate in a coincidence circuit, short-base #3 grid, Silicon-free 6.3 V/300 mA heater, Miniature 7-pin base
7033 – 5 in (13 cm) Tonotron P20 Display storage CRT, two-necked, Ditetrar 8-pin base + Miniature 7-pin base
7034 = Eimac 4X150A = QEL1/150 (6.0 V/2.6 A heater), 7035/4X150D (26.5 V/580 mA heater), 7609 (26.5 V/510 mA heater) – 250 W, 150 MHz Forced-air cooled, glass/metal beam power tetrode, B8F/JEDEC B8-236 9-pin base
7036 – 5915/EH960 Switching heptode with a different envelope
7037 – 1.8 in (46 mm) Image Orthicon, 6.3 V/600 mA heater, Diheptal 14-pin base
7038, 7038A – 5⁄8 in (16 mm) Vidicon, 6.3 V/600 mA heater, Ditetrar 8-pin (JEDEC E8-11) base
7043 – High-vacuum, non-directional, S4 phototube, Octal base
7044 – Dual medium-μ triode used in computer equipment, center-tapped 12.6 V/450 mA resp. 6.3 V/900 mA heater, Noval base
7046 – 4+7⁄16 in (113 mm), 14-Stage, head-on, extended-S11 photomultiplier, 250-650 nm, 21-pin Thirtyfivar (JEDEC E21-40) base
7054/8077 – 5 W, 40 MHz Power pentode used in mobile communications equipment, 12-15 V/275 mA heater, Noval base
7055 – 6AL5/EAA91 Dual diode with a 12-15 V/155 mA heater, used in mobile communications equipment
7056 – 6CB6 Sharp-cutoff pentode with a 12-15 V/150 mA heater, used in mobile communications equipment
7057 – 200 MHz Dual medium-μ triode used in mobile communications equipment, 12-15 V/180 mA heater, Noval base
7058 – Dual high-μ AF triode used in mobile communications equipment, 12-15 V/155 mA heater, Noval base
7059 – Medium-μ triode + sharp-cutoff pentode used in mobile communications equipment, 12-15 V/195 mA heater, Noval base
7060 – 40 MHz Medium-μ triode + power pentode used in mobile communications equipment, 12-15 V/280 mA heater, Noval base
7061 – 9 W Beam power tetrode used in mobile communications equipment, 12-15 V/210 mA heater, Noval base
7062/E180CC – Separate cathodes dual triode used as a flip-flop in computers, Silicon-free, center-tapped 6.3 V/400 mA resp. 12.6 V/200 mA heater, Noval base, not recommended where low hum or microphony or noise is critical
7183, 7183A – 4 in (10 cm), P20 Display storage CRT, co-axial Neoditetrar 8-pin + Miniature 7-pin base
7184 – Ruggedized 6V6-GT beam power tetrode
7186 – Underwater, thermal neutron flux-mapping resp. fission fragment counting, Nitrogen/Argon-filled fission chamber with 90% enriched235U3O8-lined stainless steel envelope and center electrode, max. 125 °C (257 °F)
7187 (220 mmHg (29 kPa)), 7188 (760 mmHg (101 kPa)) – Thermal neutron-detecting resp. fission fragment counting, Nitrogen/Argon-filled ionization chamber with 90% enriched 235U3O8-lined Aluminium envelope and center electrode, max. 300 °F (149 °C)
7189/6BQ5/EL84, 7189A – AF Beam power pentode, 6.3 V/760 mA heater, Noval base
7190, 7191 (Anode on top cap), 7192 (wire-ends) – 1.2 kV, 20 Apeak Ruggedized Hydrogen triode thyratrons, 6-6.6 V/1.6-2 A heater, Miniature 7-pin base
7229 (2 kV, 500 Asurge, Miniature 7-pin base),[159]7230 (3 kV, 500 Asurge, Miniature7pin-style wire-ends),[160]7231 (1.5 kV, 10 Asurge, subminiature, circular 8-pin/wire-ends),[161]7232 (1.5 kV, 10 Asurge, subminiature, circular 8-pin/wire-ends),[162] – Krytrons, gas-filled, cold-cathode trigger tubes with a keep-alive/primer anode for use as a very high-speed, high-surge current switch[163]
7233 – 8 W Power triode used as series-pass regulator in stabilized DC power supplies, 6.3 V/1.0 A heater, Noval base
7234 – 8 kV, 10 W Power pentode used as 5 mA shunt regulator, Noval base with anode on top cap; cf. 6842
7235 – Reduced-size 2C53 power triode
7236 – Long-life, dual power triode used as power amplifier in computer applications, 6.3 V/2.4 A heater, Octal base
7237 – 6 kW, 30 MHz Forced-air cooled power triode, 12.6 V/33 A filament
7239 – 2.2 kV, 4 W Beam power pentode used as shunt regulator, 6.3 V/300 mA heater, Noval base
7240 – 7190 Hydrogen triode thyratron with a 26.6-29.4 V/370-460 mA heater
7241 (μ=2.7), 7242 (μ=9) – Triple-cathode power triodes with a hard glass envelope, a Gold-plated Molybdenum wire grid, and a Zirconium-coated Graphite anode, designed for high-reliability cathode follower series-pass regulator applications in stabilized DC power supplies where the cathode is split into 3 sections connected together via balancing resistors to equalize the emission along the cathode, 6.3 V/7.5 A heater, B7D/U7G Giant 7-pin base; can replace four 6080-WA or 6AS7-G
7243 – Thermal neutron-detecting, 96% enriched 10BF3-filled proportional counter, Aluminium envelope and Tungsten center electrode
7244 (6.3 V/450 mA heater, Medium-μ), 7244A (shorter envelope), 7245 (6.3 V/400 mA heater, high-μ), 7245A (shorter envelope) – Ruggedized, frame-grid triode, Miniature 7-pin base
7246 – Subminiature triode, 1.25 V/150 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
7247 – Low-hum, low-noise version of 12DW7/ECC832 dual dissimilar AF triode used in Hi-Fi amplifiers
7248 (Oil-cooled, 200 W, 125 kV), 7249 (larger dissipator, oil or forced-air cooled, 350 or 200 W, 125 or 65 kV) – Power triode used in hard-tube pulser modulators
7255 – 9 kW, 30 MHz Water-cooled power triode, 6 V/60 A filament
7296 – Miniature, ceramic/metal, disk-seal planar VHF triode for use on PCBs, 6.3 V/400 mA heater
7297, 7298, 7299, 7306, 7307, 7509, 7556 – 1.5 kV Gas-filled triode thyratrons, negative control characteristic, 2.37-2.63 V filament, anode on top cap
7308/E188CC – Ruggedized, low-hum, low-noise, low-microphonics version of 6922/E88CC dual triode
7311 = Bendix TE31 – Ceramic/metal 6L6 AF beam power tetrode with a 6.3 V/800 mA heater and a Miniature 7-pin base
7312 = Bendix TE32 – Ceramic/metal low-μ triode, 6.3 V/1.25 A heater , Miniature 7-pin base; one section of 6080
7313 = Bendix TE33 – Ceramic/metal half-wave rectifier, 6.3 V/1.55 A heater, Miniature 7-pin base; one section of 5R4
7314 = Bendix TE34 – Ceramic/metal 6AG7/6AK7 AF beam power tetrode, 6.3 V/600 mA heater, Miniature 7-pin base
7315 – 3.8 in (9.7 cm), P20 Display storage CRT, Diheptal 14-pin base
7316/ECC186 – Separate cathodes dual triode used in digital computers, μ = 17, Silicon-free, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
7317 – 6998 Proportional counter with Alumina insulation and the center electrode on a flying lead
7318 – Pulse-rated dual power triode, center-tapped 12.6 V/175 mA resp. 6.3 V/350 mA heater, Noval base
7319 = ELC1K/B – 2 kV, 1 A Xenon triode thyratron with a Tantalum anode, negative control characteristic, 2.5 V/5.5-7.1 A filament, UX4 Bayonet base
7320/E84L – 6 W Ruggedized power pentode used in AF amplifiers and stabilized power supplies, Silicon-free 6.3 V/760 mA heater, Noval base
7321 = C6J/L – 1 kV, 6.4 A Xenon triode thyratron with a Tantalum anode on top cap, negative control characteristic, 2.38-2.63 V/19-23 A filament
7322 = EG&G 1822 – 25 kV, 1.5 A Ceramic/metal Hydrogen triode thyratron, 6.3 V/16 A heater
7323 (7979) – 80 VRMS, 3 mA Subminiature, top-viewing, Neon triode thyratron, negative control characteristic, used as a latching indicator, 1.25 V/280 mA filament, all-glass 4-pin/wire-ends; replaces the Raytheon CK1050
7363 – 1.5 kV, 1.6 A Gas-filled triode thyratron, negative control characteristic, center-tapped 2.37-2.63 V/8.5 A filament, UX4 Bayonet base with anode on top cap
7370 – 5687 Dual triode with a center-tapped 40 V/130 mA resp. 20 V/260 mA heater
7371 – 75 W, 175 MHz Linear beam power pentode used as SSB amplifier, 6.3 V/3.2 A filament, Septar base with anode on top cap
7377 – 2×10 W, 1 GHz Dual power tetrode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, modified Loctal base with 2 off-circle anode pins
7378 – 100 W, 30 MHz Linear power tetrode, B5F Giant 5-pin UY base
7381 – TR cell
7382 – Low-hum, high-μ AF triode, 6.3 V/300 mA heater, Miniature 7-pin base
7383 – Permachon5⁄8 in (16 mm) Vidicon camera tube with pickup/storage (=frame freezer) and slow scan capabilities
7384 – 25 kV, 1.25 A Hydrogen tetrode thyratron, half-indirect, center-tapped 6.3 V/21.5 A filament, B5D/U5G Giant 5-pin UY base with anode on top cap
7386 – 1 kV, 6.4 A Ruggedized, Xenon triode thyratron, 2.5 V/17-23 A filament, B4D Superjumbo base with anode on top cap
7389, 7389A, 7389B, 7389B/L, 7389C – 4+1⁄2 in (110 mm), S10 Image Orthicon, supersedes the 7295
7399 – 300 W, 500 MHz Forced-air cooled, ceramic/metal power tetrode used in grounded-grid L-band amplifiers, 6-6.8 V/5.6 A heater
7400 (12 mA), 7401 (7 mA) – 180 V Subminiature, top-viewing, cold-cathode, Neon triode thyratrons, positive starter voltage, used as a latching indicator, all-glass 3-pin/wire-ends; similar to 395A, МТХ-90
7403 = Bendix TE-74 – 4 kV, 40 W Hard glass, pulse-rated beam power tetrode, 6.3 V/1.7 A heater, 6-pin Octal base
7404 – S21→P20 Visible light to near-UV image intensifier
7408 – 14 W AF Beam power tetrode, 6.3 V/450 mA heater, 7-pin Octal base
7410 – Thyratron, 2.5 V/7 A filament, Octal base with anode on top cap
7413 – Power triode used in hard-tube pulser modulators
7414 = Bendix TD-70 – Subminiature Time Totalizer, a metal-vapor coulometer, a cold-cathode gas-discharge tube where metal is constantly sputtered off the cathode and deposited on a collector element whose resistance therefore decreases with elapsed time, all-glass round cross-section envelope, circular 8-pin/wire-ends[169]
7416 = Bendix TD-36A – Constant firing diode, a gas-filled, cold-cathode switching diode with a very stable ignition voltage over age and temperature used as a trigger in RC timing crcuits, Miniature 7-pin base
7423 – 5 in (13 cm), P20 Iatron Display storage CRT, modified Diheptal 14-pin base
7427 – 400 mW max., Side-on, CdS S15 photoresistor (LDR) for direct AC relay operation in street light controls, Noval base
7430 – Flat-envelope variant of 6AK5/EF95 sharp-cutoff pentode for use on PCBs in Radiosonde weather balloon transmitters
7551 (12-15 V/360 mA heater for mobile equipment), 7558 (6.3 V/800 mA heater for fixed equipment) – 10 W, 175 MHz Beam power pentode used for telephony, RF amplification, and more rarely AF amplification, Noval base
7559 – 25 kV, 1.5 kA Crowbar Hydrogen triode thyratron, 6.0-6.6 V/27-33 A heater
7560 (Water-cooled, 175 kW), 8317 (forced-air cooled, 60 kW) – 30 MHz Power triode, 14.5 V/450 A filament
7561 – Long-life AF power pentode, Silicon-free 25 V/300 mA heater, Octal base
7565 – 4 kW Forced-air cooled AF power triode, 6 V/60 A filament
7566 – Radechon, an early form of digital computer memory
7568 – 25 kV, 800 A Crowbar Hydrogen triode thyratron, 6.0-6.6 V/15-22 A heater
7570, 7571, 7572, 7575, 7702 – Dual-electron gunrecording storage tube, a realtime analog videoframe freezer tube with simultaneous R/W, and storing capability. This was achieved by a CRT/camera tube combination - the CRT part writes the video signal onto a thin, dielectric target, which can hold the generated charge pattern for many hours, the camera part reads the charge pattern from the back side of this target, producing a video signal containing a static shot that resembles a still photograph[170][171][172][173][174]
7576 – Subminiature high-μ UHF power triode with 4 grid leads used in grounded-grid amplifiers, 6.3 V/450 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
7580, 7580-W/4CX250R, 8930 (Larger anode cooler for high-altitude avionics service) – Forced-air cooled beam power tetrode, 6 V/2.6 A heater, Special 8-pin base
7581, 7581A – 6L6-GC AF beam power tetrode with controlled zero-bias characteristic and a Micanol Octal base, 6.3 V/900 mA heater
7610 – Electron bombarded semiconductor tube for high-speed, 8-bit A/D conversion - a beam deflection tube where the analog signal to be digitized deflects a sheet beam across an array of 8 long semiconductor diodes that is covered by a metal layer with windows patterned to encode the Gray code. The 8 diodes are reverse-biased and when hit through a window by the electron beam, generate currents that digitally represent the analog signal;[175] cf. XQ1200, XQ1340, ЭПЛ-1
7623 = M-OV/GEC TT21 (6.3 V/1.6 A heater), 7624 = M-OV/GEC TT22 (12.6 V/800 mA heater) – 37.5 W, 30 MHz Beam power tetrode, Octal base with anode on top cap; derived from KT88
7625 – Miniature, ceramic/metal, disk-seal planar AF triode used on PCBs, 6.3 V/215 mA heater
7626 – Subminiature RF power pentode, 1.25 V/125 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
7761 – Ruggedized, subminiature video pentode, 26.5 V/110 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
7762 – Ruggedized, subminiature avionics AF beam power pentode, 26.5 V/110 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
7763 – Pentode-type sheet-beam deflection tube used as IF amplifier/limiter where a constant phase shift over a wide range of input signal amplitudes is required, 6.3 V/600 mA heater, Noval base[176]
7764 – 1+1⁄2 in (38 mm), 6-Stage, head-on, S11 photomultiplier, Ninar 9-pin (JEDEC E9-37) base
7867 – 24 W AF Beam power tetrode, 6.3 V/2.5 A heater, Octal base with anode on top cap
7868 – 6GM5 or 7591 AF Beam power pentode with a B9E Novar base, found in many of the once popular Challenger series PA amps made by [David] Bogen Communications, also found in some guitar amplifiers made by Ampeg
7905 – 10 W Beam power tetrode, center-tapped 6.3 V/650 mA coated quickstart filament, Noval base
7906 (Water-cooled), 7907 (forced-air cooled) – 50 kV, 15 A Half-wave rectifier, 7 V/265 A filament
7908 (Ruggedized), 7909 (commercial) – 1⁄2 in (13 mm), 10-stage, head-on, S11 photomultiplier with integral, potted resistor network for the dynodes, only 3 wire-ends
7971 = EdiSwan S11E12 (28 W anode, 6.3 V/1.6 A heater, Octal base), 7972 = EdiSwan 13E1 = EEV C1158 (90 W anode, center-tapped 26 V/1.3 A resp. 13 V/2.6 A heater, Septar base) – Beam power tetrodes used in DC power supplies
7973 = EdiSwan S2E20 – 5 W, 100 MHz Ruggedized beam power tetrode, Noval base
7974 – 3 kW, 40 MHz Water-cooled power triode, 8 V/26 A filament
7977 = Burroughs B4032, 7977A – 0 1 2 3 4 5 6 7 8 9 Miniature, Neon-filled, top-viewing digital indicator tube, 0.31 in (7.9 mm) character height
7978 – 5 kHz Neon-filled bidirectional Dekatron with 10 output cathodes, 13-pin base
7979 (7323) – 118 V, 3 mA Subminiature, Neon triode thyratron used as a latching indicator, 1.25 V/250 mA filament, all-glass round cross-section envelope, 4-pin/wire-ends
7980 – 84 V, 3.5 to 6 mA Voltage-regulator tube, Miniature 7-pin base
7981 = XR1-3200A – 1.5 kV, 3.2 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, 2.5 V/12 A filament
7982 – 35 kW Water-cooled AF power triode, 7 V/265 A filament
7983 – 2×7 W Dual VHF power tetrode internally neutralized for 200 MHz, 3.15 V/1.65 A filament, Noval base
7984 – 20 W, 175 MHz Compactron Beam power tetrode, 12-15 V/580 mA heater
8000 – 120 W, 30 MHz Power triode, 10 V/4.5 A filament, B4F/U4J Jumbo base with control grid on side cap and anode on top cap
8001 = 4E27 – 125 W Glass radial-beam power pentode, 5 V/7.5 A filament, B7D/U7G Giant 7-pin base
8002 – 1.2 kW, 150 MHz Water+forced-air cooled power triode, center-tapped 16 V/38 A filament
8003 – 100 W Power triode, 10 V/3.25 A filament, B4F/U4J Jumbo base with anode on top cap; similar to 211
8005 – 75 W Power triode, 10 V/3.25 A filament, UX4 Bayonet base with anode on top cap
8008 – 872A Mercury-vapor half-wave rectifier with a B4D Superjumbo base
8008XE – Hard glass, Xenon-filled 8008
8011 – 600 MHz Micropup-type power triode, 8.2 V/7 A filament
8012, 8012A – 40 W UHF Power triode, 6.3 V/1.92 A heater; supersedes type 1628
8013A – 40 kV, 20 mA Half-wave rectifier, 2.27-2.63 V/4.7-5.3 A heater, UX4 base with anode on top cap
8014A – 400 W Forced-air cooled, pulse-rated power triode, 15.0 V/14.5 A heater
8016 – 10 kV, 2 mA Half-wave rectifier, 1.25 V/200 mA filament, 6-pin Octal base
8020 = CSF V40 – Directly heated, -40...+12.5 kV, 100 mA thermally-limited (=saturated) emission diode used as a surge-limiting EHT rectifier, 5 V/6 A thoriated Tungsten filament, UX4 Bayonet base
8025, 8025A (Micanol base) – 40 W, 500 MHz Power triode, center-tapped 6.3 V/1.92 A filament, UX4 base with grid and anode on dual side caps each
8030 = Bendix TD-41 (12.4-18 GHz, RG-91/U), 8031 = TD-42 (18-25.5 GHz, RG-53/U) – Argon-filled noise diodes for use with waveguides
8053 (2 in (51 mm)), 8054 (3 in (76 mm)), 8055 (5 in (130 mm)) – 10-Stage, head-on, S11 photomultipliers, Diheptal 14-pin base
8056 – Low (12-50 V) anode voltage Nuvistor triode, 6.3 V/135 mA heater
8057 – Bayard–Alpert vacuum gauge
8058 – Nuvistor triode used in grounded-grid UHF circuits, grid on envelope, anode on top cap
8059 = Bendix TD-72 – 8.2-12.4 GHz Argon-filled noise diode for use with RG-52/U waveguides
8062 – 1+1⁄4 in (32 mm), 10-Stage, head-on, dry ice or liquid air-cooled S1 (red/IR-sensitive) photomultiplier, Duodecal 12-pin base
8063 = XR1-1600A = ZT1011 – 1 kV, 1.6 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, center-tapped 2.5 V/8.5 A filament
8072 – 100 W, 60 MHz Linear beam power tetrode, 12-15 V/1.3 A heater, Elevenar 11-pin (JEDEC E11-81) base
8073 – Dual-range thermal neutron-detecting resp. fission fragment counting, 760 mmHg (101 kPa) Nitrogen/Argon-filled ionization chamber with 90% enriched235U3O8-lined Aluminium envelope and center electrode, max. 300 °F (149 °C)
8074 (Compensated, Nitrogen-filled), 8075 (uncompensated, Nitrogen/Argon-filled) – Thermal neutron-detecting ionization chambers with enriched 10Boron-lined Magnesium alloy envelope and center electrode and a guard ring
8105 – Thermal neutron-detecting, ruggedized, compensated, Nitrogen-filled, γ-tolerant ionization chamber with enriched 10Boron-lined, high-purity Aluminium envelope and center electrode and a guard ring
8106 – 6 W RF Beam power tetrode used as frequency multiplier, 12-15 V/250 mA heater, Noval base
8108 – Lighthouse 12.5 W, 6 GHz Disk-seal power triode, 6.3 V/735 mA heater, Octal base
8111 = 344H – 1.5 kW, 3.35-3.65 GHz Power Traveling-wave tube, 6.3 V/2.5-3 A heater, TNC connectors
8116 = YL1071 (Center-tapped 26.5 resp. 13.25 V heater), 8117 = YL1070 (center-tapped 12.6 resp. 6.3 V heater) – 2×30 W, 60 MHz Dual linear power tetrode, Septar base
8118 = QQZ03-20 = YL1020 – 2×10 W, 460 MHz Dual beam power tetrode, 1.6 V/4.25 A oxide-coated quickstart filament, Septar base with anodes on top pins
8119 = TBL2/400 – 2.2 kV, 400 W, 470 MHz Forced-air cooled, ceramic/metal, coaxial power triode, 3.4 V/19 A filament
8121 (150 W), 8122 (400 W) – 500 MHz Forced-air cooled, ceramic/metal beam power tetrode, 13.5 V/1.3 A heater, Elevenar 11-pin (JEDEC E11-81) base
8124 – 8 in (20 cm) Storatron, P20 (optionally P4) Display storage CRT, JEDEC B25-139 15+10-pin base
8128 – 2.9-3.1 GHz Liquid-cooled, pulse-rated power Traveling-wave tube, 8 V/8 A heater; high-duty cycle version of the Raytheon QKW730 for use as a driver for the 8129
8136 – 6DK6 Pentode with a Silicon-free 6.3 V/300 mA heater
8137 – Thermal neutron-detecting, uncompensated, Nitrogen-filled ionization chamber with enriched 10Boron-lined Aluminium envelope and center electrode
8138 – 18 J, 2.6 kV Triggered spark gap
8139 – 5 in (13 cm), P20 Display storage CRT, two-necked, Ditetrar 8-pin base + Miniature 7-pin base
8148 – 40 kW Water-cooled AF power triode, 7 V/260 A thoriated Tungsten filament
8149, 8150 (Anode on top cap) – 35 W, 175 MHz Compactron Beam power pentode, center-tapped 13 V/600 mA resp. 6.5 V/1.2 A heater
8151 = Bendix TD-38 (2.6-3.95 GHz, RG-48/U), 8152 = TD-40 (8.2-12.4 GHz, RG-52/U) – Argon-filled noise diodes for use with waveguides
8154 – 7-11 GHz Ruggedized signal Traveling-wave tube, 6.3 V/300 mA heater
8156 – 11 W, 175 MHz Compactron Beam power tetrode, 12-15 V/300 mA heater
8158 = Eimac 3CX10000A1 – 12 kW Forced-air cooled, ceramic/metal AF power triode, 7.5 V/94-104 A filament
8159/3CX10000A3 (Medium-μ, 140 MHz), 8160/3CX10000A7 (high-μ, 160 MHz) – 12 kW Forced-air cooled, ceramic/metal power triode, 7.5 V/94-104 A filament
8161/3CX2500A3/3X2500A3, 8161R (Mesh filament), 8251/3CX2500F3/3X2500F3 (cable connection) – 2.5 kW, 75 MHz Forced-air cooled power triode, 7.5 V/51 A filament; available as ceramic/metal or glass/metal
8162/3CX3000F7 = ITT 3JC/171G – 3 kW, 30 MHz Forced-air cooled, ceramic/metal, Zero-Bias, high-μ power triode, 7.5 V/50.5-51.5 A thoriated Tungsten filament, flexible grid and filament leads
8163/3-400Z = YD1130 – 400 W, 110 MHz Radiation-cooled, linear RF/AF power triode, μ = 350, 5.0 V/14.5 A thoriated Tungsten filament
8164/3-1000Z – 1 kW, 110 MHz Glass power triode, 7.5 V/21.5-22.7 A thoriated Tungsten filament, B5F Giant 5-pin UY base with anode on top cap
8165/4-65A – Beam power tetrode, 6 V/3.2-3.8 A thoriated Tungsten filament, 5-pin Septar base
8166/4-1000A – Forced-air cooled beam power tetrode, 7.5 V/20-22.7 A thoriated Tungsten filament, ventilated B5K Supergiant 5-pin UY base
8167/4CX300A – Ceramic/metal RF power tetrode, 6.0 V/2.85 A heater
8168/4CX1000A – 1 kW, 110 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 6 V/9 A heater
8169/4CX3000A – 3 kW, 150 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 9 V/39.5-43.5 A thoriated Tungsten filament
8172/4X150G – 250 W, 500 MHz Forced-air cooled, glass/metal coaxial power tetrode, 2.5 V/6.2-7.3 A heater
8173/4W20000A – 20 kW, 250 MHz Water-cooled power tetrode, 10 V/30 A heater
8177 – 1.2 kW, 500 MHz Forced-air cooled, ceramic/metal power tetrode, 4 V/60 A thoriated Tungsten filament
8179 – 800 W, 30 MHz Radiation-cooled, linear power tetrode, 7.5 V/22.6 A thoriated Tungsten filament, B5F Giant 5-pin UY base
8184 – 10 kW, 500 MHz Forced-air cooled, glass/metal beam power tetrode, 22 V/12.6 A heater
8185 (6.3 V/300 mA heater), 8186 (26.5 V/75 mA heater) – Subminiature frame-grid triode, all-glass round cross-section envelope, circular 8-pin/wire-ends
8187/4PR65A – 65 W Radiation cooled, pulse-rated radial-beam power tetrode, Pyrovac Zirconium-coated anode, 6 V/3.2-3.8 A thoriated Tungsten filament
8188/4PR400A – 400 W Radiation cooled, pulse-rated radial-beam power tetrode, Pyrovac Zirconium-coated anode, 5 V/13.5-14.7 A thoriated Tungsten filament
8189/4PR1000A – 1000 W Radiation cooled, pulse-rated radial-beam power tetrode, Pyrovac Zirconium-coated anode, 7.5 V/20-22.7 A thoriated Tungsten filament
8198 = Eimac EM778 – 5-11 GHz Power Traveling-wave tube, 6.3 V/600 mA heater
8203 – 1.8 W, 250 MHz Nuvistor power triode, 6.3 V/160 mA heater
8205 – 600 V, 900 A Water-cooled coaxial Ignitron
8210 – Subminiature, sharp-cutoff, frame-grid pentode, 6.3 V/125 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends with control grid on top pin/wire
8211 – Subminiature video frame-grid pentode, 6.3 V/360 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
8212 – Ruggedized medium-μ triode used as cathode follower, 12.6 V/230 mA heater, Noval base
8213 – Ruggedized, subminiature medium-μ triode used as cathode follower, 12.6 V/230 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends
8214 – Thermal neutron-detecting, compensated, Nitrogen-filled, γ-tolerant ionization chamber with enriched 10Boron-lined, high-purity Aluminium envelope and center electrode and a guard ring
8223/E288CC – Ruggedized, separate cathodes dual triode used in wideband, low-noise IF, RF and cascode amplifiers, Silicon-free 6.3 V/475 mA heater, Noval base
8224 – 150 kV (In oil), 80 kV (in air), 125 mAavg, 750 mApeak Half-wave rectifier, 60 W Molybdenum anode, 5.5 V/6.5 A thoriated Tungsten filament
8225 – 2-4 GHz Signal Traveling-wave tube, 6.17-6.34 V/700-1000 mA heater
8226, 8227 (Pulse-rated) – 300 W, 400 MHz Forced-air cooled avionics beam power tetrodes, 6.3 V/3.2 A heater
8228 – 81 V, 2 to 4 mA Subminiature voltage-regulator tube
8232 = Varian VA128 – 2.7-3.6 GHz Pulse-rated power Traveling-wave tube, 7.5 V/2 A heater
8233/E55L – Ruggedized wideband power pentode, 6.3 V/600 mA heater, Magnoval base with Gold-plated pins
8236 – 6DQ5 Beam power pentode with a hard glass envelope and a 50 W, 30 MHz Graphite anode
8238/3CX3000A1/3X3000A1, 8239/3CX3000F1/3X3000F1 (Cable connection) – 3 kW Forced-air cooled AF power triodes, 7.5 V/49-54 A thoriated Tungsten filament; available as ceramic/metal or glass/metal
8240/3CW5000A1/3W5000A1, 8241/3CW5000F1/3W5000F1 (Cable connection) – 5 kW Water-cooled AF power triodes, 7.5 V/40-54 A thoriated Tungsten filament; available as ceramic/metal or glass/metal
8242/3CW5000A3/3W5000A3, 8243/3CW5000F3/3W5000F3 (Cable connection, 30 MHz) – 5 kW Power triode, 7.5 V/49-54 A thoriated Tungsten filament; available as ceramic/metal or glass/metal; water-cooled variants of the 8161/3CX2500A3 and 8251/3CX2500F3
8244/4CW2000A – 2 kW, 110 MHz Ceramic/metal power tetrode, 6.0 V/9 A heater; water-cooled variant of 8168/4CX1000A
8245/4CX250K (6.0 V/2.3-3 A heater), 8246/4CX250M (26.5 V/350-680 mA heater) – 250 W, 500 MHz Forced-air cooled, ceramic/metal radial-beam power tetrodes
8247/4PR125A – 125 W Radiation cooled, pulse-rated radial-beam power tetrode, Pyrovac Zirconium-coated anode, 5 V/6-7 A filament, B5E Giant 5-pin UY base with anode on top cap
8248/4PR250C – 250 Wavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac Tantalum anode, 5.0 V/14 A filament, B5E Giant 5-pin UY base with anode on top cap
8249/4W300B – 300 W Water-cooled variant of 7203/4CX250B
8320 – 5 in (13 cm), P20 Display storage CRT, Diheptal 14-pin base
8321/4CX350A/YL1340 (6.0 V/2.9-3.6 A heater), 8322/4CX350F/YL1341, 8904/4CX350FJ (26.5 V/660-810 mA heater) – 350 W Ruggedized, forced-air cooled, ceramic/metal, linear AF radial-beam power tetrode
8326 – 33 kV, 4 kApeak, 7 Aavg Hydrogen triode thyratron, 6-6.6 V/35-55 A heater and 3.5-5.5 V/24 A reservoir heater
8327 – Power pentode, 6.3 V/760 mA heater, Noval base
8330, 8331 – TR cells
8332 – 9.7-9.9 GHz Reflex Klystron
8334 – Ruggedized UHF triode used in grounded-grid amplifiers, 6.3 V/225 mA heater, Miniature 7-pin base
8414 – Ruggedized, subminiature, low (26.5 V) anode voltage, sharp-cutoff, VHF/RF/IF, frame-grid pentode designed for both the 26.5 V/45 mA heater and the anode to run directly off the standard avionics 28-volts DC bus, all-glass wire-ended, up to 80,000 ft (24 km) altitude; cf. 28D7-W
8415 – 300 W, 300 MHz Forced-air cooled power triode, 5 V/11.5 A thoriated Tungsten filament
8416 – 6922/E88CC ruggedized, low-noise dual triode with a 12.6 V/150 mA heater, used in oscilloscope front ends
8417 – 35 W AF Beam power pentode used in Hi-Fi amplifiers, 6.3 V/1.6 A heater, Octal base
8425, 8425A, 8426, 8426A – 6AU6 Pentode with a higher transconductance-to-anode-current ratio
8428 (2.4 kilowatts), 8455 (4 kilowatts) – High pulse power, grid-controlled electron multiplier tubes with a flanged metal envelope and an SO-239 UHF output connector
8429 = YL1120 – 4 kW, 60 MHz Forced-air cooled, ceramic/metal, coaxial, linear power tetrode, 16 V/16.5 A filament
8431 – 200 MHz Dual medium-μ triode used in sonobuoys, 12.6 V/180 mA heater, Noval base
8432 – 1 kW Forced-air cooled, ceramic/metal RF beam power pentode, 6.0 V/8.2 A heater, Septar base
8433/Z504S/ZM1070 – 5 kHz Neon-filled Dekatron with 10 output cathodes, 13-pin base
8434, 8435 (Different pinout) – 20 kV, 1.8 A Hydrogen half-wave rectifiers, 4.75-6.25 V/9.5-13.8 A heater; drop-in replacements for 6894 resp. 6895
8437 – 10 kW, 500 MHz Forced-air cooled Cermolox ceramic/metal beam power tetrode, 8.5 V/88 A heater
8438/4-400A – 400 W, 110 MHz Glass radial-beam power tetrode, 5 V/14.5 A filament, B5E Giant 5-pin UY base with anode on top cap
8441 – Nuvistor high-μ triode used in sonobuoys, 6.0-8.5 V heater
8445, 8446 (Different pinout) – Medium-μ triode + sharp-cutoff pentode, 6.75 V/440 mA heater, Noval base
8447 – Premium version of 12BR7 dual diode + high-μ triode with a center-tapped 12-15 V/190 mA resp. 6-7.5 V/380 mA heater
8448 – Premium version of 12BY7/EL180 power pentode with a center-tapped 12-15 V/260 mA resp. 6-7.5 V/520 mA heater
8453 = Z550M = ZM1050 – Pixie Neon-filled, top-viewing digital indicator tube for transistorized circuits, Dekatron-type readout with common anode and common cathode, pulsating anode voltage, controlled by 5-volts sensitive starter electrodes
8454 – 5 in (13 cm) P20 Half-tone display storage CRT, two-necked, JEDEC B7-183 8-pin base + Miniature 7-pin base
8455 – See 8428
8456 – Nuvistor medium-μ triode used in sonobuoys, customer-specified heater voltage between 6 and 8.5 V
8461 – 80 kV, 200 kW Pulse-rated, water-cooled power triode used as series-pass regulator in stabilized DC power supplies or as hard-tube pulser modulator, 3-phase filaments internally star-connected with center/neutral available, 15 V/200 A each, considerable X-radiation
8462 – 100 W, 50 MHz Ceramic/metal beam power tetrode, 2.9 V/4.6 A heater, Elevenar 11-pin (JEDEC E11-81) base
8463 = YL1000 – 12 W, 50 MHz Power pentode, 1.1 V/880 mA quickstart filament, Noval base
8464 – Power triode used in hard-tube pulser modulators
8522 – 5636 Dual-control pentode with improved isolation resistance and lower microphonics
8524 – Ruggedized, metal subminiature, shielded dual-control RF pentode, Silicon-free 6.3 V/150 mA heater
8525, 8526 (with metal shell and ceramic stem, Silicon-free heater), 8527 – Dual medium-μ VHF triodes with a base anticipating the Nuvistor, 6.3 V/300 mA heater
8528 – Ruggedized, metal subminiature, shielded AF beam power tetrode, Silicon-free 6.3 V/450 mA heater
8529 – Ruggedized, metal subminiature, shielded semiremote-cutoff RF pentode, Silicon-free 6.3 V/150 mA heater
8530 – Ruggedized, metal subminiature, shielded sharp-cutoff RF pentode, Silicon-free 6.3 V/150 mA heater
8532/6J4-WA – Ruggedized 6J4/EC98 high-μ triode
8533 – 100 W, 3 GHz Forced-air cooled planar power triode, Phormat[157] cathode, 6.3 V/1.3 A heater
8534 (Conduction/convection cooled), 8535 (forced-air cooled) – 150 W, 2.5 GHz Ruggedized, ceramic/metal planar power triodes, high-emission Phormat cathode, 6.3 V/1.3 A heater;[158] miniaturized variants of 7698 resp. 7211 or 8403;[178] miniaturized 7698 resp. 7211; cf. 8403
8536 (Conduction/convection cooled), 8537 (forced-air cooled) – 150 W, 2.5 GHz Ruggedized, ceramic/metal planar power triodes, Phormat cathode, 6.3 V/1 A heater; miniaturized 7815/3CPN10A5 resp. 7855
8569 – Single-pixel, top-view vacuum fluorescent display used as flip-flop status indicator in transistorized computers, 700 mV/35 mA filament, all-glass wire-ended; similar to ИВ-29↦IV-29; cf. 6977/DM160
8812 = YL1420 – 11 kW, 260 MHz Forced-air cooled, ceramic/metal, coaxial, linear power tetrode, 6.3 V/120 A thoriated Tungsten filament
8813 = YL1430 – 18 kW, 260 MHz Forced-air cooled, ceramic/metal, coaxial, linear power tetrode, 8 V/120 A thoriated Tungsten filament
8814 = YL1440 – 2.4 kW, 260 MHz Forced-air cooled, ceramic/metal, coaxial, linear power tetrode, 4.2 V/53 A thoriated Tungsten filament
8824 (470-566 MHz), 8825 (566-698 MHz), 8826 (698-890 MHz) – Water/vapor-cooled UHF Klystrons with a modulating anode for amplifying both the video and audio carriers with the same beam supply, in TV transmitters
8828 – 200 W, 500 MHz Forced-air cooled power tetrode with a Beryllia heat sink coupler, 26.5 V/680 mA heater, Elevenar 11-pin (JEDEC E11-81) base
8843, 8894 – Side-view, seven-segment vacuum fluorescent display, right decimal point, 1.5 V/40 mA filament, B10G Decar base (=Noval plus center pin)
8846 – 140 kW, 30 MHz Ruggedized, integral water jacket-cooled, ceramic/metal, pulse-rated power triode, 16.5 V/325 A filament
8847 (6.3 V/1.3 A heater), 8847A (6.3 V/950 mA heater) – 150 W, 3.5 GHz Ruggedized contact/conduction cooled planar power triode
8850 (Plane window), 8851 (spherical-segment window) – 1.8 in (46 mm), 12-Stage, head-on, S24 photomultipliers with a QuantaconⅢ-Ⅴ group compound (GaP) first dynode, 21-pin base
8867 = YD1352S – 2 kW, 5 MHz Water-cooled Neotron, a gridless field-effect tube where a magnetically-focused electron beam is modulated by varying the voltage of a gate electrode surrounding it, used as RF power amplifier or oscillator, 5 V/6.1 A heater
8973 – 650 kW Water-cooled, ceramic/metal power tetrode, 18.5 V/650 A filament
8974 = Eimac X-2159 – 1.5 MW, 30 MHz Water-cooled tetrode used for very high-power broadcast and industrial service, center-tapped 2×18.5 V/650 A thoriated Tungsten filament for 2-phase operation
Burroughs was the original holder of the now-generic trademark Nixie, coined after purchasing the original manufacturer, Haydu Brothers Laboratories
Also made by National Electronics, who used the prefix NL instead of B
B4021 = 8502 (Low-voltage, round envelope cross-section), BD200S = 7009 (regular), B4032 = 7977 (long-life), B4081 (wide-angle), B4998 (rectangular/stackable) – 0 1 2 3 4 5 6 7 8 9 Top-viewing, 5⁄16 in (7.9 mm) character height; similar to ZM1122
B4022 (BD255, Regular), B4026 (low-voltage), B4031 (long-life) – + - Top-viewing, 5⁄16 in (7.9 mm) character height
B5016 (BD214, Regular), B5032 (long-life), B5992, B50911 – + - Top-viewing, 0.61 in (15.5 mm) character height
B5018 (BD216), B50322 – A B C D E F G H J K Top-viewing, 0.61 in (15.5 mm) character height
B5025 = 8651 (10000h lifespan, no Mercury), B5030 = 8652 (200000h lifespan), BD310 – 0 1 2 3 4 5 6 7 8 9 Side-viewing, 0.61 in (15.5 mm) character height, 5 dual cathodes and separate odd/even anode compartments for biquinary multiplexing
B5031 = 8037 (Long-life), HB106 = 6844, BD302 = 6844A (regular), B5092 = 8421 (long-life, wide viewing angle), B5961 (no Mercury, rectangular), B5991 = 8422 (rectangular), B59956 (rectangular with left decimal point) – 0 1 2 3 4 5 6 7 8 9 Top-viewing, 0.61 in (15.5 mm) character height
B5035, B50113 (BD221) – L M N P R S T U V W X Top-viewing, 0.61 in (15.5 mm) character height
B5093 – + - B C D G I O Q S Top-viewing, 0.61 in (15.5 mm) character height
B5094 – M µ N and A S V Top-viewing dual, common-anode, 0.275 in (7.0 mm) character height, used in digital multimeters
B5440, B5441 (With both left and right decimal points), B5445 (upside-down, no decimal points) – 0 1 2 3 4 5 6 7 8 9 Side-viewing, 0.61 in (15.5 mm) character height; "A" variants have the evacuation tip at bottom instead of top
B5442 – + - Side-viewing, 0.61 in (15.5 mm) character height
B5448 – + -OL Side-viewing, 0.61 in (15.5 mm) character height
B5560 – 0 1 2 3 4 5 6 7 8 9 Upside-down side-viewing, 1⁄2 in (12.7 mm) character height
B5750, B5750S (Shorter leads) – 0 1 2 3 4 5 6 7 8 9 Side-viewing, 1⁄2 in (12.7 mm) character height, both left and right decimal points, low-pressure, low-cost
B5853ST, B5855ST (Lower base/pin straightener) – 0 1 2 3 4 5 6 7 8 9 Side-viewing, 1⁄2 in (12.7 mm) character height, both left and right decimal points, low-cost
B5856ST – + - Side-viewing, 1⁄2 in (12.7 mm) character height, low-cost
B5859, B5859S (Shorter leads) – 0 1 2 3 4 5 6 7 8 9 Side-viewing, 1⁄2 in (12.7 mm) character height, both left and right decimal points
B5971 – Top-viewing, 14-segment display tube, 5⁄8 in (15.9 mm) character height
B6012 (BD225, Regular), B6034 (long-life) – + - Top-viewing, 0.808 in (20.5 mm) character height
BG08220-K – 120-Segment circular with five cathode strings plus a Reset cathode, 1-in-5 major/minor graduation used e.g. in direction-finding equipment
BG12201 = DalePBG12201 – Dual 201-segment linear with three cathode strings plus a Reset cathode,[180] for use in VU meters etc.
BG12203 = PBG12203 – Dual 203-segment linear bidirectional with three cathode strings plus two Reset cathodes
BG12205 = PBG12205 – Dual 201-segment linear with five cathode strings plus a Reset cathode,[181] for use in VU meters etc.
BG16101 = PBG16101 – Dual 101-segment linear with three cathode strings plus a Reset cathode used in VU meters etc.; similar to ИН-33
BD401 = 6702 (200-400 MHz), BX1203 = 6713 (0.15-30 MHz) – Beam-X Switch modified for use as a noise source by removing all but the last two spade and grid pairs, thus introducing asymmetries of the already undulated electric field inside, using the principle of random noise generation in a Magnetron-like device operated near cut-off, 6.3 V heater
KN2KN1 – 3 kV, 500 AsurgeKrytron, a gas-filled, cold-cathode, pulsed arc-discharge thyratron with a keep-alive/primer anode, used as a very high-speed, high-surge current switch, pulse duration 10 µs, max. anode delay 1 µs,[182] max. jitter 100 ns, lifespan 107 shots, all-glass T3 with 4 wire-ends[183]
KN2 – 5 kV, 500 Asurge Krytron with a keep-alive/primer anode, pulse duration 10 µs, max. anode delay 700 ns, max. jitter 20 ns, lifespan 107 shots, all-glass T3 with 4 wire-ends[184]
Pre-Eimac, developed by Bill Eitel (W6UF) and Jack McCullough (W6CHE) while still working for Heintz & Kaufman:
HK354 – 150 W, 15 MHz Gammatron Radiation-cooled power triode, μ=14, 5 V/10 A filament, Tantalum anode, Nonex hard glass envelope, B4F/U4J Jumbo base with anode on top cap; predecessor of the 150T (=250TL), the first Eimac tube
From 1934 to 1945, Eimac made only convection/radiation-cooled, directly heated rectifiers and power triodes.[188] Eimac soon found that their early anode dissipation ratings were too cautious[189]
15E = 3-15A3 = 4C30 = 8023 – 20 W, 600 MHz Miniature pulse power triode, μ=25, 5 V/4 A filament, grid on top pin and anode on side pin,[190] used as power oscillator, also popular as thermally-limited (=saturated) emissionnoise diode[191]: 321
15R = 4B30 – 20 kV, 20 Apeak, 30 mAavg Pulse rectifier, 5 V/4 A filament, anode on top cap[192]
25T = 3-25A3 = 3C34 – 25 W Power triode, μ=24, 6.3 V/3 A filament, UX4 base with anode on top pin
35T = 35TL = 3-50A4 (Grid on base), 35TG = 3-50D4 (grid on side pin) – 50 W, 100 MHz Power triode, μ=39, 5 V/4 A filament, UX4 base with anode on top pin
75TL = 3-75A2 (μ=12), 75TH = 3-75A3 (μ=20) – 75 W, 40 MHz Power triode, 5 V/6.25 A filament, UX4 base with grid on side pin and anode on top pin
100R = 2-100A = 8020 – 40 kV, 100 mA Thermally-limited emission rectifier, 5 V/6.5 A filament, UX4 base with anode on top cap
100T = 100TL = 3-100A2 (=up-rated 50T; μ=14), 100TH = 3-100A4 (μ=38) – 100 W, 40 MHz Power triode, 5 V/6.3 A filament, UX4 base with grid on side pin and anode on top pin
152TL = 3-150A2 (μ=12), 152TH = 3-150A3 (μ=20) – 150 W, 40 MHz Power triode, center-tapped 10 V/6.25 A resp. 5 V/12.5 A filament, 4-pin Bayonet base with anode on top pin
250R = 2-250A – 60 kV, 250 mA Thermally-limited emission rectifier, 5 V/10.5 A filament, B4F/U4J Jumbo base with anode on top cap
250T = 250TL = 3-250A2 (=up-rated 150T; μ=14), 250TH = 3-250A4 (μ=37)[193] – 250 W, 40 MHz Power triode, 5 V/10.5 A filament, B4F/U4J Jumbo base with grid on side pin and anode on top cap
304TL = 3-300A2 (μ=12), 304TH = 3-300A4 (μ=20) – 300 W, 40 MHz Power triode, center-tapped 10 V/12.5 A resp. 5 V/25 A filament, 4-pin Bayonet base with grid on side cap and anode on top cap
450T = 450TL = 3-450A2 (=up-rated 300T; μ=18), 450TH = 3-450A4 (μ=38)[194] – 450 W, 40 MHz Power triode, 7.5 V/12 A filament, B4F/U4J Jumbo base with grid on side cap and anode on top cap
750T = 750TL = 3-750A2 (=up-rated 500T) – 750 W, 40 MHz Power triode, μ=15.5, 7.5 V/21 A filament, B4F/U4J Jumbo base with grid on side cap and anode on top cap
1000T = 3-1000A4 (6C21) – 1 kW, 50 MHz Power triode, μ=35, 7.5 V/17 A filament, B4F/U4J Jumbo base with grid on side cap and and anode on top cap
1500T = 3-1500A3 – 1.5 kW, 40 MHz Power triode, μ=24, 7.5 V/24 A filament, B4F/U4J Jumbo base with grid on side cap and anode on top cap
2000T = 3-2000A3 – 2 kW, 40 MHz Power triode, μ=23, 10 V/25 A filament, B4F/U4J Jumbo base with grid on side cap and anode on top cap
This scheme was phased out in favor of the system below in 1945, when the FCC reallocated the VHF-FM broadcast band from 42-50 MHz to 87.5-108 MHz where tetrode transmitters were better suited at the time
UH50 = 3-50G2 = 304B = 834 – 50 W Radiation-cooled power triode, μ=10.6, 7.5 V/3.25 A filament, UX4 base with grid and anode on top cap. The up to cherry-red anode glow was recommended as tank/antenna tuning indicator
3CW25000A3 – 25 kW, 100 MHz Water-cooled, ceramic/metal medium-μ power triodes, 6.3 V/152-172 A filament
3CW30000H3 (Medium-μ), 3CW30000H7 (High-μ) – 30 kW, 90 MHz Water-cooled, ceramic/metal power triodes, 6.3 V/152-172 A filament with flexible filament leads
3CW40000H3 – 40 kW, 90 MHz Water-cooled, ceramic/metal medium-μ power triodes, 10 V/152-168 A filament with flexible filament leads
3CX100A5/7289 (6.0 V/1 A heater), 3CX100F5/8250 (26.5 V/220 mA heater) – 100 W, 3 GHz Oil can-type forced-air cooled, ceramic/metal disk-seal, coaxial, planar, high-μ power triode, 6.3 V/1 A heater, popular among radio amateurs for 23cm-band microwave amplifiers; 2C39A with different heaters
3CX300A1 – 300 W Forced-air cooled, ceramic/metal, low-μ power triode, 6.3 V/2.65 A heater
3CX400A7/8874 (EIA E11-81, 11-pin with ring base), 3CX400U7/8961 (Coaxial) – 400 W, 500 MHz Forced-air cooled, ceramic/metal, high-μ power triode, 6.3 V/3 A heater
3CX800A7 – 800 W, 350 MHz Forced-air cooled, ceramic/metal, high-μ power triode, 13.5 V/1.5 A heater
3CX1000A7/8283 – 1 kW, 220 MHz Forced-air cooled, ceramic/metal, high-μ power triode, 5 V/30.5 A filament
3CX1500A7/8877 – 1.5 kW, 110 MHz Forced-air cooled, ceramic/metal high-μ power triode, 5 V/10.5 A filament
3CX2500A3/8161 (75 MHz), 3CX2500F3/8251 (30 MHz, with flexible grid and filament leads), 3CX2500H3 (75 MHz, with flexible filament leads) – 2.5 kW Medium-μ triode, 7.5 V/49-53 A filament; ceramic/metal variants of 3X2500s; forced-air cooled variants of 3CW5000A3 and 3CW5000F3
3CX3000A1/8238, 3CX3000F1/8239 (with flexible grid and filament leads) – 3 kW Forced-air cooled, low-μ AF power triode, 7.5 V/49-54 A filament; ceramic/metal variants of 3X3000s
3CX3000A7 (110 MHz), 3CX3000F7/8162 (30 MHz, with flexible grid and filament leads) – 3 kW Forced-air cooled, ceramic/metal, Zero-Bias, high-μ power triode, 7.5 V/50.5-51.5 A filament
3CX4500F3 – 4.5 kW, 75 MHz Forced-air cooled, ceramic/metal medium-μ power triode, 7 V/78 A filament with flexible leads
4-65A/8165 – 65 W, 150 MHz Glass beam power tetrode, 6.0 V/3.2-3.8 A filament, 5-pin Septar base with anode on top cap
4-125A/6155/4D21 – 125 W, 120 MHz Glass beam power tetrode, 5 V/6.5 A filament, B5E Giant 5-pin UY base with metal shell and anode on top cap
4-250A/6156/5D22 – 250 W, 110 MHz Glass beam power tetrode, 5 V/14.5 A filament, B5E Giant 5-pin UY base with anode on top cap
4-400A/8438, 4-400C/6775 – 400 W, 110 MHz Glass radial-beam power tetrode, 5 V/14.5 A filament, B5E Giant 5-pin UY base with anode on top cap
4-500A – 500 W, 110 MHz Glass radial-beam power tetrode, 10 V/10.2 A filament, B5E Giant 5-pin UY base with anode on top cap
4-1000A/8166 – 1 kW, 110 MHz Glass beam power tetrode, 7.5 V/20-22.7 A filament, B5K Supergiant 5-pin UY base with a metal shell and anode on top cap, popular in broadcast and amateur transmitters
4CM300000G = 9000 – 300 kW, 50 MHz Water/vapor ("Multiphase") cooled, ceramic/metal power tetrode used in broadcast transmitters, 15 V/480 A filament
4CN15A – 15 Wavg Coolerless variant of the 4CX300A/8167 for low duty or pulse service, but may be operated immersed in a liquid coolant
4CPX250K/8590 – 250 Wavg, 17.5 kWpeak, 500 MHz Forced-air cooled, ceramic/metal radial-beam grid-pulsed power tetrode, 6.0 V/2.5 A heater
4CS100L – 100 W, 250 MHz Contact/conduction-cooled, ceramic/metal power tetrode + control diode to monitor the emission of the quickstart 2.1 V/7.15-8.10 A filament
4CS250R – 250 W, 500 MHz Ruggedized, contact/conduction-cooled, ceramic/metal power tetrode with a Beryllia heat sink coupler, quickstart 6.0 V/2.6 A filament
4CV8000A – 8 kW, 150 MHz Water/vapor cooled, ceramic/metal power tetrode, 9 V/41.5 A filament
4CV20000A – 20 kW, 30 MHz Water/vapor cooled, ceramic/metal power tetrode, 7.5 V/73-78 A filament
4CV35000A – 35 kW, 110 MHz Water/vapor cooled, ceramic/metal power tetrode, 6.3 V/152-168 A filament
4CV50000E, 4CV50000J – 50 kW, 110 MHz Water/vapor cooled, ceramic/metal power tetrode, 12 V/220 A filament
4CV75000A – 75 kW, 30 MHz Water/vapor cooled, ceramic/metal power tetrode, 10 V/300 A filament
4CV100000C/8351 – 100 kW, 30 MHz Water/vapor cooled, ceramic/metal power tetrode, 10 V/300 A filament
4CV250000 (30 MHz, 12.0 V/640 A filament), 4CV250000A (30 MHz, 12.0 V/660 A filament), 4CV250000B (50 MHz, 12.0 V/660 A filament) – 250 kW Water/vapor cooled, ceramic/metal power tetrode
4CW800B (6.0 V/4.4 A heater), 4CW800F (26.5 V/1.1 A heater) – 800 W, 800 MHz Water-cooled, ceramic/metal power tetrode
4CW2000A/8244 – 2 kW, 110 MHz Ceramic/metal radial-beam power tetrode, 6.0 V/9 A heater; water-cooled variant of 4CX1000A/8168
4CW10000A/8661 – 10 kW, 110 MHz Water-cooled, ceramic/metal power tetrode, 7.5 V/73-78 A filament
4CW25000A – 25 kW, 110 MHz Water-cooled, ceramic/metal power tetrode, 6.3 V/160 A filament
4CW50000C/8350 (30 MHz, 10 V/300 A filament), 4CW50000E (110 MHz, 12 V/220 A filament), 4CW50000J (110 MHz, 12 V/220 A filament) – 50 kW Water-cooled, ceramic/metal power tetrode
4CW100000D (30 MHz, 10 V/295 A filament), 4CW100000E (110 MHz, 15.5 V/215 A filament), 4CW100000G (110 MHz, 15.0 V/170 A filament) – 100 kW Water-cooled, ceramic/metal power tetrode
4CW150000E – 150 kW, 110 MHz Water-cooled, ceramic/metal power tetrode, 15.5 V/215 A filament
4CW250000A, 4CW250000B, 4CW250000V – Water-cooled variants of 4CV250000A, 4CV250000B
4CX125C (6.0 V/2.6-3.1 A heater), 4CX125F (26.5 V/600-700 mA heater) – 125 W, 500 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode
4CX250s – 250 W, 500 MHz Forced-air cooled, ceramic/metal radial-beam power tetrodes, popular among radio amateurs as a final amplifier
4CX250B/7203 = QEL2/275 – 6.0 V/2.6 A heater, B8F/JEDEC B8-236 9-pin blow-through base
4CX250BC/8957 – Long-life, tighter specs variant of 4CX250B
4CX250F/7204 = 4CX250FG/8621 = QEL2/275H – 26.5 V/540 mA heater
4CX250K/8245 – Coaxial variant of 4CX250B for use with a cavity resonator, 6.0 V heater
4CX250M/8246 – 26.5 V heater variant of 4CX250K
4CX250R/7580-W – Ruggedized variant of 4CX250B, 6.0 V heater
4CX300A/8167 – 300 W, 500 MHz Forced-air cooled, ceramic/metal power tetrode, 6.0 V/2.6-3.1 A heater
4CX300Y/8561 – 400 W, 110 MHz Forced-air cooled, ceramic/metal power tetrode, 6.0 V/3-3.85 A heater
4CX350A/8321/YL1340 (6.0 V/2.9-3.6 A heater), 4CX350F/8322/YL1341 (26.5 V/660-810 mA heater) – 350 W Forced-air cooled, ceramic/metal radial-beam AF power tetrode; ruggedized 26.5 V heater variant: 4CX350FJ/8904
4CX600s – 600 W Forced-air cooled, ceramic/metal radial-beam power tetrode
4CX600F – 500 MHz, 26.5 V/1.05 A heater for use in distributed wideband amplifiers
4CX600J/8809 – 6.0 V/5.4 A heater, Larger anode cooler
4CX600JA/8921 – 6.0 V/5.4 A heater, Larger anode cooler
4CX1000A/8168 (110 MHz), 4CX1000K/8352 (with a solid screen ring for UHF use) – 1 kW Ceramic/metal radial-beam power tetrode, 6.0 V/9 A heater; forced-air cooled variant of 4CW2000A/8244
4CX1500A (150 MHz, 5.0 V/38.5 A filament), 4CX1500B/8660 (6.0 V/9-11 A filament) – 1.5 kW Forced-air cooled, ceramic/metal radial-beam power tetrode
4CX3000A/8169 – 3 kW, 150 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 9 V/41.5 A filament
4CX3500A – 3.5 kW, 220 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 5.0 V/90 A filament
4CX5000J/8909 – 6 kW, 100 MHz Forced-air cooled, ceramic/metal, linear radial-beam power tetrode, 7.5 V/103 A filament
4CX7500A – 7.5 kW, 220 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 7.0 V/103 A filament
4CX10000D/8171 (7.5 V/75 A filament), 4CX10000J (7.5 V/103 A filament) – 10 kW, 110 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode; 4CX5000A/8170 with a larger cooler
4CX12000A/8989 – 12 kW, 220 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 7.5 V/120 A filament
4CX15000A/8281 – 15 kW, 110 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 6.3 V/160 A filament
4CX15000J/8910 = 9019 = YC-130 – More linear 4CX15000A/8281 with a 7.5 V/160 A dense mesh-type filament
4CX20000A/8990, 4CX20000B, 4CX20000C – 20 kW, 110 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 10 V/140 A filament
4CX25000A – 25 kW, 230 MHz Forced-air cooled, ceramic/metal radial-beam power tetrode, 9.5 V/150 A filament
4CX35000A, 4CX35000C/8349 (longer screen/anode insulator for Class-C screen grid or anode modulation), 4CX35000D – 35 kW, 110 MHz Forced-air cooled, ceramic/metal power tetrode, 10 V/300 A filament, used in numerous 50-kW broadcast transmitters, often in a Doherty configuration as in the Continental Electronics 317C series
4CX40000G, 4CX40000GM (Different grid pattern to reduce intermodulation distortion, made for Marconi Company Ltd) – 40 kW, 220 MHz Forced-air cooled, ceramic/metal power tetrode, pyrolytic graphite grids, 15 V/170 A filament[195]
4PR60A, 4PR60B/8252 – 60 Wavg, 300 kWpeak Radiation+forced-air cooled, glass, pulse-rated power tetrode used as modulator/amplifier, 26.0 V/2.1 A heater; supersedes 715C and 5D21; ruggedized variant: 4PR60C/8252-W
4PR65A/8187 – 65 Wavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac anode, used as modulator/amplifier, 6.0 V/3.2-3.8 A filament
4PR125A/8247 – 125 Wavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac anode, 5.0 V/6-7 A filament, B5E Giant 5-pin UY base with anode on top cap
4PR250C/8248 – 250 Wavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac Tantalum anode, 5.0 V/14 A filament, B5E Giant 5-pin UY base with anode on top cap
4PR400A/8188 – 400 Wavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac anode, 5.0 V/13.5-14.7 A filament, B5K Supergiant 5-pin UY base with anode on top cap
4PR1000A/8189 – 1 kWavg Radiation+forced-air cooled, glass, pulse-rated power tetrode with a Pyrovac anode, 7.5 V/20.0-22.7 A filament, B5K Supergiant 5-pin UY base with anode on top cap
4W300B/8249 – 300 W, 500 MHz Water-cooled, glass/metal power triode, 6.0 V/2.6 A heater, B8F/JEDEC B8-236 9-pin base
4W20000A/8173 – 20 kW, 220 MHz Water-cooled, glass/metal power triode, 10 V/30 A heater
5K50CB – 10 kW, 4.4 to 5.0 GHz Ethylene glycol-cooled, electromagnet-focused linear-beam, 5-cavity Klystron used in C-band troposcatter systems
5K70SH – 30 kW, 2.45 GHz Forced-air and water-cooled, electromagnet-focused linear-beam, 5-cavity Klystron used for industrial, microwave dielectric heating
5KM300SI – 100 kW, 2.1 to 2.4 GHz Forced-air and water-cooled, electromagnet-focused linear-beam, 5-cavity Klystron used in Unified S-band ground transmitters of spacecraft communications systems
6K50000LQ – 10 kW, 720 to 980 MHz Forced-air and water-cooled, permanent magnet-focused linear-beam, 6-cavity Klystron
B – 180 V, 60 mA Helium-filled, cold-cathode, full-wave rectifier for use in B+ (=anode supply) battery eliminators, UV4 Bayonet base, introduced in 1925 as The Raytheon by American Appliance Company, as their first product. Shortly thereafter, AAC changed their own name to "Raytheon Manufacturing Company" and the product name to "Type B"
BA (1 kV, 350 mA), BH (1 kV, 125 mA) – Gas-filled, cold-cathode, full-wave rectifiers, UX4 base
BR – 300 VRMS, 50 mA Gas-filled, cold-cathode, half-wave rectifier, UX4 base
LA = 6A4 (Commonly branded as 6A4/LA) – Power pentode
CK502AX, CK503AX – Subminiature AF power pentode used in hearing aids, UAmax = 45 V, 1.25 V/30 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK505AX – Subminiature AF pentode for use in wearable or portable instruments, UAmax = 30 V, 625 mV/30 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK506AX, CK507AX – Subminiature AF power pentode used in hearing aids, UAmax = 45 V, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK509AX – Subminiature AF triode for use in wearable or portable instruments, UAmax = 45 V, 625 mV/30 mA filament, all-glass elliptical cross-section envelope with 4 inline wire-ends
CK510AX – Subminiature, dual tetrode with a space charge grid, UAmax = 45 V, 625 mV/50 mA filament, all-glass elliptical cross-section envelope with 7 inline wire-ends
CK512AX – Subminiature AF pentode for use in wearable or portable instruments, UAmax = 25 V, 625 mV/20 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK526AX – Subminiature AF power pentode for use in wearable or portable equipment, UAmax = 45 V, 1.25 V/20 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK532DX = DL650 – Subminiature power pentode, UAmax = 30 V, 1.25 V/15 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK533AX – Subminiature AF power pentode for use in wearable or portable equipment, UAmax = 45 V, 1.25 V/15 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK534AX – Subminiature AF pentode for use in wearable or portable equipment, UAmax = 30 V, 625 mV/15 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK538DX = DF650 – Subminiature AF pentode used in hearing aids, 625 mV/15 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK542DX – Subminiature AF power pentode for use in wearable or portable equipment, UAmax = 30 V, 1.25 V/15 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK546DX = DL651 – CK532DX with a 1.25 V/10 mA filament
CK547DX – Subminiature AF power pentode for use in wearable or portable equipment, UAmax = 45 V, 1.25 V/10 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends
CK549DX = DF651 – CK538DX with a 625 mV/10 mA filament
CK718 (Used in hearing aids), CK721 (rejected CK718), CK722 (rejected CK721) – Binned Germanium PNP bipolar junction transistor - CK721/2 were sold off to hobbyists since 1953, making them the first commercially available low-cost transistors
CK1005 = QMG159 – 450 V, 30 to 70 mA Gas-filled, full-wave rectifier, 6.3 V/50 mA filament - maintaining the filament powered after startup is optional because ionic cathode heating is sufficient, Octal base, used in vibrator power supplies in early car radios
CK1006 – 1.6 kV, 70 to 200 mA Gas-filled, full-wave rectifier, 1.75 V/2 A filament, UX4 base
CK1007 – 1.2 kV, 30 to 110 mA Gas-filled, full-wave rectifier, 1 V/1.2 A filament, 5-pin Octal base
CK1018, CK1019, CK1020, CK1021, CK1023 – β and γ-detecting, self-quenched Geiger-Müller tube used in geological survey instruments and in prospector's equipment
CK1022 – 1 kV, 5 to 55 µA Corona voltage-regulator tube, Miniature 7-pin base with anode on top cap
CK1024 – 1 kV, 50 to 175 mA Gas-filled, full-wave rectifier, 5-pin Octal base
CK1026 – γ-detecting, Halogen-quenched Geiger-Müller tube used in prospector's equipment
CK1030, CK1031, CK1032 – Spark gaps
CK1036 = 6436, CK1042 = 6659 – Subminiature half-wave, noble gas-filled rectifier used in vibrator power supplies, all-glass with 2 long wire-ends
CK1047 – 1.2 kV/12 mA Half-wave, gas-filled, cold-cathode rectifier, Miniature 7-pin base with anode on top cap
CK1049 – β and γ-detecting, self-quenched Geiger-Müller tube
CK1050A – 118 V, 3 mA Subminiature, Neon triode thyratron used as a latching indicator, 1.25 V/250 mA filament, all-glass with 4 wire-ends; superseded by 7323
CK1054 – Subminiature, gas-filled triode thyratron designed specifically to operate like a vacuum triode below its ignition voltage, 1.4 V/50 mA filament, see RK61
CK1362 – 10 in (25 cm) Controlled-persistence CRT with a blue-fluorescence, infrared-stimulable Phosphor capable of storing electron beam energy and later release it in the form of yellow-green phosphorescence when irradiated with IR in the 1 µm range, 6-pin Duodecal base
CK1366 (3 in (7.6 cm), single pixel row), CK1367 (3", multi-row), CK1368 (10 in (25 cm), single-row), CK1369 (10", multi-row) – CRTs with an unphosphored front glass but with fine wires embedded in it for use as electrostatic print heads. The wires would pass the electron beam current through the glass onto a sheet of paper where the desired content was therefore deposited as an electrical charge pattern. The paper was then passed near a pool of liquid ink with the opposite charge. The charged areas of the paper attract the ink and thus form the image;[200][201] cf. SC2795, SC3863, SC3144, SC3154
CK1383 – Dual-electron gunrecording storage tube, a realtime polar, radar PPI-to-rectangular (TV-type) analog videoscan converter similar to the 7702, with simultaneous R/W, and storing capability. This was achieved by a CRT/camera tube combination - the CRT part writes the PPI-format image onto a thin, dielectric target, the camera part reads the generated charge pattern in TV format from the back side of this target[202]
QK748 (Top window optionally made of Sapphire (λcutoff=6 µm) or of Silicon (full range)), QKN748, QKN884 (Silicon window), QK902, QK1003, QK1004 (BaF2 window (full range)) – p-type Gold-doped Germanium 2...9 µm infrared photoresistors for use in a liquid Nitrogendewar[205]
RK10 – 12 W, 60 MHz Power triode, μ = 8, 7.5 V/1.25 A filament, low lossIsolantite UX4 Bayonet base for improved RF performance;[208] derived from type 10
RK11 (μ=20; 1623), RK12 (μ=80) – 25 W, 60 MHz Power triode, 6.3 V/3 A filament, Isolantite UX4 Bayonet base with anode on top cap
RK18 – 40 W, 60 MHz Power triode, Molybdenum anode, 7.5 V/3 A filament, Isolantite UX4 Bayonet base with anode on top cap
RK19 (Full-wave, 7.5 V/2.5 A heater), RK21 (half-wave, 2.5 V/4 A heater), RK22 = 3B23 (full-wave, 2.5 V/8 A heater) – 3.5 kV, 200 mA Rectifier, UX4 Bayonet base with anode(s) on top cap(s)
RK20A – 40 W, 30 MHz Power pentode, Molybdenum anode, 7.5 V/3.25 A filament, hard glass envelope, Isolantite UY5 base with anode on top cap
RK23 (2.5 V/2 A heater, Isolantite base), RK25 (6.3 V/900 mA heater, Isolantite base; 802), RK25B (Bakelite base), – 10 W, 30 MHz Power pentode, U7B base with anode on top cap
RK24 – 1.5 W, 112 MHz Power triode, μ = 8, 2 V/120 mA filament, Isolantite UX4 Bayonet base; replaces type 30
RK28 – 100 W, 30 MHz Power pentode, Molybdenum anode, 10 V/5 A filament, hard glass envelope, Isolantite B5D/U5G Giant 5-pin UY base with anode on top cap
RK30 (800) – 35 W, 60 MHz Power triode, Molybdenum anode, 7.5 V/3.25 A filament, Isolantite UX4 Bayonet base with anode and control grid on top caps
RK31 – 40 W, 30 MHz Power triode, Molybdenum anode, 7.5 V/3 A filament, Isolantite UX4 Bayonet base with anode on top cap
RK32 = 304B = 834 – 50 W, 150 MHz Power triode, Molybdenum anode, 7.5 V/3.25 A filament, Isolantite UX4 Bayonet base with anode and control grid on top caps
RK33 (1642, 2C21) – 2×2.5 W, 60 MHz Separate cathodes dual power triode, μ = 10.5, 6.3 V/600 mA heater, Isolantite U7A base with one control grid on top cap
RK34 = 2C34 – 2×5 W, 240 MHz Separate cathodes dual power triode, μ = 13, 6.3 V/800 mA heater, Isolantite U7A base with both control grids on top caps
RK35, RK37 – 50 W, 60 MHz Power triode, Tantalum grid and anode, 7.5 V/4 A filament, Isolantite UX4 Bayonet base with control grid on side cap and anode on top cap
RK36 (μ=4), RK38 – 100 W, 60 MHz Power triode, Tantalum grid and anode, 5 V/8 A filament, Isolantite UX4 Bayonet base with control grid on top cap and anode on side cap
RK39 (6.3 V/900 mA heater; 807), RK41 (2.5 V/2.4 A heater) – 25 W, 60 MHz Beam power tetrode, Isolantite UY5 base with anode on top cap
RK42 – 120 MHz Triode, μ = 8.2, 1.5 V/60 mA filament, UX4 base
RK43 – Dual VHF power triode, μ = 13, 1.5 V/120 mA filament, U6A base
RK44 (318A, 837) – 12 W, 20 MHz Power pentode, 12.6 V/700 mA heater, Isolantite U7B base with anode on top cap
RK45 – 10 W, 30 MHz Power pentode, 12.6 V/450 mA heater, Isolantite U7B base with anode on top cap
RK46 – 40 W, 30 MHz Power pentode, Molybdenum anode, 12.6 V/2.5 A filament, Isolantite U7B base with anode on top cap
RK47 – 50 W, 30 MHz Beam power tetrode, 10 V/3.25 A filament, hard glass envelope, Isolantite UY5 base with anode on top cap
RK48 – 100 W, 30 MHz Beam power tetrode, 10 V/5 A filament, hard glass envelope, Isolantite B5D/U5G Giant 5-pin UY base with anode on top cap
RK49 – 21 W, 15 MHz Beam power tetrode, 6.3 V/900 mA heater; 6L6-G with an Isolantite U6A base
RK51 (4C22), RK52 – 60 W, 60 MHz Power triode, Graphite anode, 7.5 V/3.75 A filament, hard glass envelope, Isolantite UX4 Bayonet base with anode on top cap
RK56 – 8 W Beam power tetrode, 6.3 V/550 mA heater, UY5 base
RK57 = 805 – 125 W, 30 MHz Power triode, 10 V/3.25 A filament, B4F/U4J Jumbo base with anode on top cap
RK59 – Dual power triode, 6.3 V/1 A filament, UX4 base with anodes on top caps
RK60 = 1641 – 750 VRMS, 250 mAoutput Full-wave rectifier, 5 V/3 A filament, UX4 base with both anodes on top caps
RK61 – Subminiature, gas-filled triode thyratron designed specifically to operate like a vacuum triode below its ignition voltage, allowing it to both amplify analog signals and work as a relaxation oscillator used as a self-quenching superregenerative detector up tp 100 MHz in radio control receivers, activating a relay in its anode circuit when a carrier wave is received, Ua=45 V, Ia=1.5 mA, 1.4 V/50 mA filament, all-glass with 4 wire-ends[209]
RK62 – RK61's predecessor, marketed since 1938.[210] This was the major technical development which led to the wartime development of radio-controlled weapons and the parallel development of radio controlled modelling as a hobby.[211]
RK63 (250TH) – Power triode, 5 V/10 A filament, B4F/U4J Jumbo base with anode on top cap
RK64 – Power pentode, 6.3 V/500 mA filament, UY5 base with anode on top cap
RK100 – Mercury vapor-filled power tetrode designed specifically to operate like a vacuum triode below its ignition voltage, grid #1 acts as a Glow-type keep-alive/primer anode for the ionizing discharge and as a virtual cathode for the amplifier section, grid #2 is the control grid, 6.3 V/900 mA heater, U6A base
800 – 35 W, 60 MHz Power triode, derating to 18 W@180 MHz, μ = 15, 7.5 V/3.1 A filament, UX4 Bayonet base with both grid and anode on top caps[13]
801 – 20 W, 60 MHz Power triode used in Class-B pairs in AM modulation sections of transmitters, derated up to 120 MHz, μ = 8, 7.5 V/1.25 A filament, Micanol UX4 Bayonet base
802 – 10 W, 30 MHz Power pentode, derating to 77%@55 MHz to 55%@100 MHz, gm = 2.25 m℧, 6.3 V/900 mA heater, UX7 base with anode on top cap[93]
803 = Raytheon RK28A – 125 W, 20 MHz Power pentode, derating to 86%@40 MHz to 80%@60 MHz, gm = 4 m℧, 10 V/5 A filament, Micanol B5D/U5G Giant 5-pin UY base with anode on top cap
804 – 40 W, 15 MHz Power pentode, derating to 88%@35 MHz to 76%@80 MHz, gm = 3.25 m℧, 7.5 V/3 A filament, Micanol UY5 base with anode on top cap
805 – 125 W, 30 MHz Power triode, derating to 82%@45 MHz to 55%@80 MHz, 10 V/3.25 A filament, B4F/U4J Jumbo base with anode on top cap. Now used in audiophile gear
806 – 150 W, 30 MHz Power triode, derating to 80%@50 MHz to 50%@100 MHz, μ = 12.6, 5 V/9.5 A filament, B4F/U4J Jumbo base with grid on side cap and anode on top cap
807 = QE06/50 – 25 W, 30 MHz Beam power tetrode, derating to 80%@80 MHz to 55%@125 MHz, gm = 6 m℧, 6.3 V/900 mA heater, Micanol UY5 base, originally designed as a Class-C transmitter tube, later used in Class-AB2 pairs as push-pull outputs for high-wattage audio amplifiers. Also used as a horizontal deflection output tube in early TV receivers. One of the first commercially available tubes that used the top cap to connect the anode (instead of the control grid) to the circuit; a variant of 6L6; ruggedized version: 807W = 5933
808 – 50 W, 30 MHz Radiation-cooled power triode with a Tantalum anode, derating to 75%@60 MHz to 50%@130 MHz, μ = 47, 7.5 V/4 A filament, UX4 Bayonet base with both grid and anode on top caps
809 – 25 W, 60 MHz Power triode, derating to 88%@70 MHz to 50%@120 MHz, μ = 50, 6.3 V/2.5 A filament, Micanol UX4 base with anode on top cap; similar to type 1623
810 – 125 W, 30 MHz Power triode with a Graphite anode, derating to 70%@60 MHz to 50%@100 MHz, μ = 36, 10 V/4.5 A filament, B4F/U4J Jumbo base (fits RCA UT-541A socket), grid on side cap and anode on top cap
811A – 45 W, 60 MHz Power triode, derating to 75%@80 MHz to 60%@100 MHz, μ = 160, 6.3 V/4 A filament, Micanol UX4 Bayonet base with anode on top cap
812A – 45 W, 60 MHz Power triode, derating to 75%@80 MHz to 60%@100 MHz, μ = 29, 6.3 V/4 A filament, Micanol UX4 Bayonet base with anode on top cap
813 – 100 W, 30 MHz Beam power tetrode, derating to 87%@45 MHz to 75%@60 MHz, gm = 3.75 m℧, 10 V/5 A filament, B7D/U7G Giant 7-pin base with anode on top cap
814 – 50 W, 30 MHz Beam power tetrode, derating to 80%@50 MHz to 64%@75 MHz, gm = 3.3 m℧, 10 V/3.25 A filament, Micanol UY5 base with anode on top cap
815 – 20 W, 150 MHz Dual beam power pentode, derating to 85%@200 MHz to 75%@225 MHz, gm = 4 m℧, center-tapped 12.6 V/800 mA resp. 6.3 V/1.6 A heater, Octal base
816 – 7.5 kV, 125 mA Mercury-vapor rectifier, 2.5 V/2 A filament, UX4 base with anode on top cap
820B – Water-cooled RF power triode, 22 V/34 A filament[212]
822 – Power triode, 10 V/4 A filament, anode on top cap[213][214]
825 – First commercially available Klystrode, a Klystron/triode hybrid used as a VHF/UHF linear-beam transmitting tube
826 – 60 W, 250 MHz Power triode, derating to 80%@300 MHz, μ = 31, center-tapped 7.5 V/4 A filament, Septar base fits RCA UT-106 socket
827R – 800 W, 110 MHz Forced-air cooled beam power tetrode, 7.5 V/25 A filament
828 – 70 W, 30 MHz Beam power tetrode, derating to 80%@50 MHz to 65%@75 MHz, 10 V/3.25 A filament, Micanol UY5 base with anode on top cap
829, 829B – 40 W, 200 MHz Dual beam power tetrode, derating to 89%@250 MHz, gm = 8.5 m℧, center-tapped 12.6 V/1.125 A heater, Septar base with dual anode top cap
830, 830B – 60 W, 15 MHz Power triode, derated up to 60 MHz, μ = 25, 10 V/2 A filament, UX4 Bayonet base with anode on top cap
831 – 400 W, 20 MHz Radiation-cooled power triode designed for an orange-red glowing anode at maximum anode power, derated 200 W@60 MHz, 11 V/10 A filament
832 – 15 W, 150 MHz Dual beam power tetrode, derating to 93%@200 MHz to 82%@250 MHz, center-tapped 12.6 V/800 mA heater, Septar base fits RCA UT-106 socket, dual anode top cap
833 – 300 W, 30 MHz Radiation-cooled power triode with a Tantalum anode, derated up to 72%@75 MHz, μ = 25, 10 V/10 A filament, fits to RCA two-part socket assembly UT-103. Anode current:800 mA @ 3 kV (anode) and 0 V (grid)4.3 A @ 800 V (anode) and +350 V/760 mA (grid)
834 – 50 W, 100 MHz Power triode, derating to 80%@170 MHz to 53%@350 MHz, μ = 10.5, 7.5 V/3.1 A filament, UX4 Bayonet base with both grid and anode on top caps
835 – 211 Power triode with the grid-to-anode capacitance reduced from 14 pF to 9.5 pF
836 – 5 kV, 250 mAavg, 1 Apeak High-vacuum rectifier, dual half-indirect cathode with each segment tied to one end of the 2.5 V/5 A heater, UX4 Bayonet base with anode on top cap
837 – 12 W, 20 MHz Power pentode, derated up to 60 MHz, gm = 3.4 m℧, 12.6 V/700 mA heater, ceramic U7B Bayonet base with anode on top cap
838 – 100 W, 30 MHz Power triode, 10 V/3.25 A filament, B4F/U4J Jumbo base
839 – Sharp-cutoff VHF tetrode, control grid on top cap; type 24-A with a tubular envelope and a low lossIsolantite UY5 base, custom-designed exclusively for Hawaiian Mutual Telephone Company for use in inter-island radio links[215]
840 – RF/IF Pentode, 2 V/140 mA filament, UY5 base with anode on top cap[216]
841 – 12 W, 6 MHz Power triode, derated 5 W@170 MHz, μ = 30, 7.5 V/1.25 A filament, UX4 Bayonet base
842 – 12 W, 6 MHz Power triode, μ = 3, 7.5 V/1.25 A filament, UX4 Bayonet base
843 – 12 W, 6 MHz Power triode, derated up to 200 MHz, μ = 7.7, 2.5 V/2.5 A heater, UY5 base
844 – RF Power tetrode, 2.5 V/2.5 A heater, UY5 base with a top cap[217] (not to be confused with CV844)
845 – 100 W AF Power triode giving up to 30 W of audio power with 5% 2nd harmonic distortion in Class-A with an anode voltage of 1.25 kV, μ = 5.3, 10 V/3.25 A filament, B4F/U4J Jumbo base. Still used in audiophile gear
846 – 2.5 kW Water-cooled RF power triode, μ = 40, 11 V/51 A filament
847 – Air-cooled RF power triode, 11 V/14.75 A filament; UV-206 with a lower μ of 4.4[218]
848 – Air-cooled RF power triode, 22 V/52 A filament; UV-207 with a lower μ of 8[219]
849 – 300 W, 3 MHz Power triode, derated up to 30 MHz, μ = 19, 11 V/5 A filament, 2-pin (filament) + one blade contact (grid) base with anode on top cap. Two 849s, working in push-pull Class-B are capable of delivering 1.1 kW of audio output with an anode voltage of 3 kV
849H – 849 with the grid on the end cap of a lateral glass arm, extending the maximum frequency (without derating) to 30 MHz[220]
850 – 120 W, 13 MHz Power tetrode, derated 50 W@100 MHz, 10 V/3.25 A filament
851 – 600 W, 3 MHz Power triode, μ = 20.5, 11 V/15.5 A filament
852 – 75 W, 30 MHz Radiation-cooled power triode with a finnedMolybdenum anode, 10 V/3.25 A filament
853 – Power pentode, 6 V/450 mA heater, Octal base[221]
854 – Air-cooled RF power triode, anode on top cap, 14.5 V/52 A filament; similar to UV-207[222]
855 – Half-wave rectifier; 854 without the control grid[223]
856 – Air-cooled, directly heated half-wave high-vacuum rectifier, anode on top cap[224]
857B – 22 kV, 10 A Large Mercury-vapor rectifier used in 50 kW class broadcast transmitters, 5 V/30 A filament
858 – 15 kW Water-cooled RF power triode, μ = 42, 22 V/52 A filament
859 – 20 kW Water-cooled RF power triode, μ = 36, 22 V/71 A filament
860 – 100 W, 30 MHz Power tetrode, derated 50 W@120 MHz, gm = 1.1 m℧, 10 V/3.25 A filament, UX4 Bayonet base with grid on side cap and anode on top cap
861 – 400 W, 20 MHz Radiation-cooled power triode with a Tantalum anode, derated 200 W@60 MHz, μ = 300, 11 V/10 A filament
862 – 50 kW Water-cooled power triode used in broadcast/industrial applications, μ = 48, 33 V/207 A filament. Used in experimental 500 kW transmitter at WLW
863 – Water-cooled RF power triode, 11 V/52 A filament[212]
864 – General-purpose, low-microphonics triode with a maximum anode voltage of 135 V and anode current of 3.5 mA, μ = 8.2, 1.1 V/250 mA filament, UX4 base
865 – 15 W, 15 MHz Power tetrode, derated up to 70 MHz, gm = 750 µ℧, 7.5 V/2 A filament, UX4 Bayonet base, anode on top cap
866866A – 5 kV, 250 mAavg, 1 Apeak Mercury-vapor rectifier, 15 V forward drop, 2.5 V/5 A filament, UX4 Bayonet base
866A – Upgraded 866 with a peak inverse voltage of 10 kV and a forward drop of 10 V
871 – 5 kV, 125 mAavg Mercury-vapor rectifier, 2.5 V/2 A filament, UX4 base with anode on top cap[225]
872 – 5 kV, 1.25 Aavg, 5 Apeak Mercury-vapor rectifier, 15 V forward drop, 5.0 V/7.5 A filament, B4F/U4J Jumbo base (fits RCA UT-541A socket), anode on top cap
872A – Upgraded 872 with a peak inverse voltage of 10 kV, a forward drop of 10 V and a filament current of 6.25 A
878 – 20 kV, 5 mAavgCRTEHT rectifier, 2.5 V/5 A filament, UX4 base with anode on top cap
879 = 2X2 = 2Ц2С↦2C2S – 12.5 kV, 100 mApeak CRT EHT rectifier, 2.5 V/1.75 A filament, UX4 base with anode on top cap
880 – 20 kW Water+forced-air cooled RF power triode, 12.6 V/320 A filament
881 – 15 kV, 5 Aavg, 15 Apeak Mercury-vapor rectifier, 20 V forward drop, 5 V/9.5 A heater
884 = 6Q5-G (DuMont) – 300 V, 1 mAavg, 300 mApeak Gas-filled triode thyratron, negative control characteristic, used as a horizontal sweep sawtooth generator in oscilloscopes; 885 with a 6.3 V/600 mA heater and an Octal base
885 = 2B4 (DuMont) – 884 with a 2.5 V/1.4 A heater and an UY5 base
887 (μ=10), 888 (μ=30) – 800 W, 225 MHz Water-cooled power triode, 11 V/24 A filament[93]: 42
889 (Water-cooled), 889R (Forced-air cooled) – 5 kW RF Power triode, μ = 21, 11 V/125 A filament
891 (5 kW, Water-cooled), 891R (Air radiator), 892 (7.5 kW, Water-cooled), 892R (Air radiator) – RF Power triode, μ = 8.5, center-tapped 22 V/60 A filament for 2-phase operation
893 (Water-cooled), 893R (Air radiator) – 20 kW Power triode with 3 independent 10 V/61 A (each) filaments for 3-phase operation in broadcast/industrial applications, μ = 36
895 – Water-cooled power triode used in broadcast/industrial applications, 3-phase filaments internally star-connected, 19 V/139 A each[227]
898 – 50 kW Water-cooled power triode used in broadcast/industrial applications, μ = 45; upgraded 862 with 3 independent 33 V/70 A (each) filaments for 3-phase operation
899A – 20 kW Water-cooled RF power triode, μ = 27, 14.5 V/180 A filament
913 – 1 in (2.5 cm) CRT used in oscilloscopes, 500 V anode, P1 green, medium-persistence Phosphor, Octal base
914A – 9 in (23 cm) CRT used in oscilloscopes, 7 kV anode, P1 green, medium-persistence Phosphor, U6A base with anode and deflector plates on side caps
917 (Anode on top cap), 919 (cathode on top cap) – High-vacuum, side-on, S1phototube, lime glass envelope, maximum sensitivity at 8,000 ± 1,000 Å (800 ± 100 nm, IR/red), UX4 base
918 – Gas-filled, side-on, S2 phototube, lime glass envelope, UX4 base with anode on top cap
920 – Dual gas-filled, side-on, S1 phototube used in a differential circuit to read variable-area film soundtracks, UX4 base
921 – Gas-filled, side-on, S1 phototube, cartridge type
954 (Philips E1F/4672) – Indirectly heated Acorn-type sharp-cutoff pentode giving gains of 2...3 up to 300 MHz operating in Class-A and usable up to 600 MHz with careful stage design, 6.3 V/150 mA heater
955 (E1C/4671) – Indirectly heated Acorn-type triode giving a power of 135 mW up to 600 MHz operating in Class-A and 500 mW in Class-C with careful stage design, 6.3 V/150 mA heater
956 (E2F/4695) – Indirectly heated Acorn-type remote-cutoff pentode giving gains of 3...4 up to 600 MHz operating in Class-A with careful stage design, 6.3 V/150 mA heater
957 (D1C) – Directly heated Acorn-type UHF receiving triode, 1.25 V/50 mA filament for portable equipment
958 (D2C) – Directly heated Acorn-type UHF transmitting triode with two internally paralleled 1.25 V/50 mA (each) filaments for increased emission, for portable equipment
958A – 958 with tightened emission specs
959 (D3F) – Directly heated Acorn-type sharp-cutoff UHF pentode, 1.25 V/50 mA filament for portable equipment
1602 – 6 MHz Low-microphonics AF power triode, derating to 75%@45 MHz to 50%@170 MHz, 7.5 V filament, giving 12 watts of AF operating in Class-A or 15 watts of low RF operating in Class-C; similar to type 10
1603 – Low-microphonics, noise, and hum, AF pentode, gm = 1.9 m℧, 6.3 V/300 mA heater, U6A base; similar to types 57, 6C6, 6D6 and 6U7-G
1604 (78) – Remote-cutoff RF/IF pentode, U6A base, control grid on top cap[213][228]
1619 – RF Beam power tetrode, gm = 4.5 m℧, 2.5 V/2 A filament, Octal base, common in World War II battle tank transmitters; similar to type 6L6 but directly heated
1620 – Low-microphonics AF pentode, gm = 1.2 m℧, 6.3 V/300 mA heater, Octal base; very similar to type 6J7
1621 – Long-life, 8.3 W version of 6F6 AF Power pentode
1622 – Long-life, 13.8 W version of 6L6 AF Beam power tetrode
1623 – 25 W Power triode, μ = 20, 6.3 V/2.5 A filament, UX4 Bayonet base; similar to type 809
1624 (2.5 V/2 A heater), 1625 (12.6 V/450 mA heater) – RF Beam power tetrode, gm = 4 m℧, Micanol Octal base with anode on top cap; very similar to type 807, but with different heaters
1626 – RF power triode; very similar to type 6J5 but with a 12.6 V/250 mA heater and a Micanol Octal base
1627 – 810 Power triode with a 5 V/9 A filament[234]
1628 = VT140 – 40 W, 500 MHz Radiation-cooled power triode with a Tantalum anode, center-tapped 3.5 V/3.25 A thoriated Tungsten filament[235]
1629 – Tuning indicator tube with DC amplifier triode unit; 6E5 with an Octal base and a 12.6 V/150 mA heater
1651 = UV-218 – 50 kV, 750 mA Half-wave rectifier, 3-pin base with anode on top cap; UV-206 without a control grid[243]
1654 – 4.3 kV, 1 mAavg, 6 mApeak Half-wave rectifier, 1.4 V/50 mA filament, Miniature 7-pin base with anode on top cap
1655 (6SC7) – Common cathode dual high-μ AF triode, Octal base[244]
1659 – Dual diode + high-μ triode; selected 2A6 for use in Boonton Q meters - then further selected and assigned 535A or 535B for their 260-A meter[245]
1677 = 25L6GT Code M-34 – Beam power tetrode; 25L6-GT with a custom-designed screen grid, and further selected by exclusive customer Bristol Co. for their industrial furnace-control equipment; rejects were returned and sold off as regular 25L6-GT[247]
1679 – Common cathode dual triode, sold exclusively to IBM for their computers; 6J6/ECC91 selected for improved cutoff and high zero-bias anode current; rejects were sold off as regular 6J6; superseded by type 1684[248]
1681 – Beam power tetrode, sold exclusively to IBM for their computers; 6AQ5/EL90 with a custom-designed control grid and a Silicon-free heater, and further selected for cutoff and zero-bias anode current; rejects were sold off as regular 6AQ5[249]
1682 – Common cathode dual triode used in radar and computer equipment aboard B-36 aircraft, sold exclusively to US Air Force, Sperry Gyroscope Co., and WE; 6J6 selected for balance between sections after aging; superseded by type 6099[250]
1684 – 1679 Dual triode with a 300 mA heater, sold exclusively to IBM for their computers; superseded by separate cathodes types 5844 and 6211[251]
1699 – Indirectly heated hexode monoscope, U6A base with dual top caps for #4 grid and anode; 2F21 with a customer-supplied test pattern
1851 (Control grid on top pin, sharp-cutoff), 1852 = 6AC7 (control grid on base pin), 1853 = 6AB7 (semiremote-cutoff) – Broadband pentodes used in experimental TV equipment, 6.3 V/450 mA heater, Octal base
2060, 2061, 2062, 2063, 2064, 2065 – 6199, 6342A, 6655A, 8053, 8054, 8055 10-stage, head-on, S11 photomultipliers with a detachable Diheptal 14-pin base for testing. 2061, 2063 and 2065 also have a higher dark current
4438, 4439, 4440, 4441, 4441A, 4461 (1+1⁄2 in (38 mm)), 4460 (3⁄4 in (19 mm)) – 10-Stage, S11, head-on Photomultipliers
4445 – SpectraPlex5⁄8 in (16 mm) Vidicon used in single-tube color video cameras, target overlaid with fine vertical yellow (=white - blue), and diagonal cyan (=white - red) dichroic filter stripes each separated by unfiltered stripes of equal width. The NTSC-format scanning beam sweeps over the alternately filtered and unfiltered stripes of the target, producing a normal baseband luminance (Y) signal plus a 5 MHz carrier amplitude-modulated with the "luminance - blue" (Y-B) component plus a 5 MHz × sin 45° = 3.58 MHz "luminance - red" (Y-R) carrier.[253][254][255] The two carriers are demodulated and the RGB colors then calculated as R=Y-(Y-R), G=Y-R-B and B=Y-(Y-B)
4600A – 3.5 kV, 1.75 kW Beam power tetrode used as regulator in stabilized DC power supplies
4604 – 90 W, 60 MHz Beam power tetrode, quickstart filament for use in mobile and emergency transmitters where the push-to-talk button also controls the heater supply
175HQ – Ultra high reliability pentode used in long-haul submarine communications cablerepeaters (e.g. in the TAT-1 where 306 of them lasted from September 1956 until retirement in November 1978 without a single failure), Ua = 51 V, Ia = 1.4 mA, gm = 1 mS, 18.2 V/200 mA heater, Gold-plated Beryllium-Copper stranded wire ends[258]
205D (Globe), 205E (globe, low-noise), 205F (ST) – 14 W, 15 MHz RF/AF/Modulator power triode, 4.5 V/1.6 A filament, UV4 Bayonet base with the Bayonet pin rotated by 50°[259]
211/B/C/D/H (also RCA, Amperex) – 100 W AF/Modulator power triode now used in audiophile gear, 10 V/3 A filament, B4F/U4J Jumbo base[260]
212D (200 W oxidized Nickel anode), 212E (also Machlett Labs, Amperex, 275 W Molybdenum anode) – 7.5 MHz RF/AF Power triode, μ = 16, 14 V/6 A filament, 4-pin Bayonet base[261]
215A – Miniature AF/IF/detector triode, 1 V/250 mA filament, Peanut 4-stub Bayonet base
216A – Amplifier/oscillator triode, 5 to 6 V/1 A filament, UV4 Bayonet base[263]
220B, 220C (also Machlett Labs, Amperex) – 10 kW, 3 MHz Water-cooled AF/modulator power triode, 21.5 V/41 A filament;[264] not to be confused with the Cossor 220B dual power triode
228A (also Amperex) – 5 kW, 3 MHz Water-cooled RF/AF power triode, 21.5 V/41 A filament[265]
231D, 257A (Control grid on top cap) – AF Triode, 3.1 V/60 mA filament, UX4 base[266]
232B, 232C (also Amperex) – 25 kW, 3 MHz Water-cooled RF/AF power triode, 20 V/60 A filament[267]
236A – 20 kW, 3 MHz Water-cooled RF/AF power triode, 21.5 V/41 A filament[268]
237A – 50 kV Water-cooled rectifier, 20 V/61 A filament[269]
240A/B – 10 kW, 20 MHz Water-cooled power triode, 21.5 V/41 A filament;[270] not to be confused with the Cossor 240B dual power triode
241B (also Machlett Labs) – 275 W, 7.5 MHz RF/AF/Modulator power triode, 14 V/6 A filament, 3-pin Bayonet base, anode on top cap[271]
242A/B/C – 85 W, 6 MHz RF/AF/Modulator power triode, Molybdenum anode, 10 V/3.25 A filament, B4F/U4J Jumbo base[272]
244A, 247A – Low-power AF triode, 2 V/1.6 A heater, UY5 base[273]
245A – RF/AF Tetrode, 2 V/1.6 A heater, UY5 base, control grid on top cap[274]
246A – RF/AF Tetrode, 3.3 V/100 mA filament, UX4 Bayonet base, control grid on top cap[275]
251A – 1 kW, 30 MHz RF/AF/Modulator power triode, 10 V/16 A filament, special wall mount construction[276]
252A – 8 Woutput AF Power triode, μ = 5, 5 V/2 A filament, UX4 Bayonet base[277]
254A (5 V/3.25 A filament), 254B (7.5 V/3.25 A filament) – 20 W, 15 MHz Power triode, UX4 base, anode on top cap[278]
256A – 325 V, 75 mA Argon triode thyratron, negative control characteristic, 2.3 V/1.7 A heater, UY5 base[279]
259A/B (Sharp-cutoff), 283A (remote-cutoff) – RF/AF Tetrode, 2 V/1 A heater, UY5 base, control grid on top cap[280]
260A = 860 – 100 W, 30 MHz Power tetrode, 10 V/3.25 A filament, UX4 Bayonet base with control grid and anode on side and top wires[281]
261A (also Amperex) – 100 W, 30 MHz RF/AF/Modulator power triode, 10 V/3.25 A filament, B4F/U4J Jumbo base[282]
262A/B (10 V/325 mA heater, UX4 base with Silver-plated pins), 347B (6.3 V/500 mA heater, Octal base) – AF Power triode for use as a driver, μ = 15, control grid on top cap[283]
264A/B/C – Low-microphonics AF triode, 1.5 V/300 mA filament, UX4 base with Silver-plated pins[284]
266B/C – 22 kV, 10 A Mercury-vapor rectifier, 5 V/42 A filament[285][286]
267B (2-pin base), 319A (B4F/U4J Jumbo base) – Half-wave high-vacuum rectifiers, 5 V/6.75 A filament, anode on top cap[287]
268A – 25 W, 30 MHz RF/AF/Modulator power triode, 5 V/3.25 A filament, UX4 base, anode on top cap[288]
269A – 275 V, 20 mA Argon triode thyratron, negative control characteristic, 2.2 V/550 mA filament, UX4 base[289]
270A – 350 W, 7.5 MHz RF/AF Power triode, special wall mount construction, μ = 16, 10 V/9.75 A filament, 3-pin base, anode on top stud[290]
271A – 3 Woutput AF Power triode, μ = 8.5, 5 V/2 A heater, UY5 base[291]
272A – Low-power AF triode, 10 V/320 mA heater, UY5 base[292]
300A – 40 W AF Power triode, μ = 3.85, 5 V/1.2 A filament, 4-pin Bayonet base[311]
300B – 36 W version of type 300A, 4-pin base with the lateral Bayonet pin rotated by 45° [312] so it could replace the 205A. Now used in audiophile gear
304B – 50 W, 100 MHz Power triode, 7.5 V/3.25 A filament, UX4 Bayonet base, anode and grid on top wires[314]
305A – 60 W, 50 MHz Power tetrode, 10 V/3.1 A filament, UX4 Bayonet base, anode and both grids on top wires[315]
306A – 15 W, 50 MHz RF/AF Power pentode, 2.75 V/2 A filament, UY5 base, suppressor grid internally tied to filament center-tap, control grid on top cap[316]
307A – 15 W, 40 MHz RF/AF Power pentode, 5.5 V/1 A filament, UY5 base, anode on top cap[317]
308B – 250 W, 1.5 MHz AF Power triode, μ = 8, 14 V/6 A filament, 4-pin Bayonet base[318]
309A – Remote-cutoff IF/AF pentode, 10 V/320 mA heater, UY5 base, control grid on top cap[319]
310A/B (10 V/320 mA heater, U6A base)[320], 348A (6.3 V/500 mA heater, Octal base)[321] – Sharp-cutoff RF/AF pentode, control grid on top cap
312A – 50 W, 20 MHz Dual-control power pentode for use with suppressor grid modulation, center-tapped 10 V/3.8 A filament, U6A base, anode on top cap[324]
313A – Gas-filled, cold-cathode trigger tube with two interchangeable cathodes/starters, UX4 base, usable as thyratron, as voltage-regulator or as rectifier[325]
314A – 300 V, 2.5 A Full-wave Mercury-vapor rectifier, 5 V/5 A filament, UX4 base[326]
315A (2-pin base), 321A (4-pin base) – 12.5 kV, 2 A Half-wave Mercury-vapor rectifier, 5 V/10 A filament[327]
316A (also General Electric, Tung-Sol) = VT191 – 30 W, 300 MHz Doorknob-type power triode, 2 V/3.65 A filament, derated up to 750 MHz[328]
319A – See 267B
322A (Dual-control for suppressor grid modulation), 332A (suppressor grid internally tied to filament center-tap) – 125 W, 20 MHz Power pentode, 10 V/5 A filament, UY5 base, anode on top cap;[329] not to be confused with the Machlett Labs 322 UHF diode
323A/B (also National Electronics, Tung-Sol, UY5 base),[330][306]393A (7-pin Octal base)[331] – 1.25 kV, 1.5 Aavg, 6 Apeak Argon/Mercury-vapor triode thyratrons, negative control characteristic, 2.5 V/7 A filament; derived from 3C23 (4-pin base)[332]
327A – Argon-filled, 2 A Tungar bulb, a low-voltage, half-wave rectifier for charging 12-volts lead-acid batteries,[333]
328A – 310A Sharp-cutoff RF/AF pentode with a 7.5 V/425 mA heater;[334] not to be confused with the Philips 328 Tungar bulb
329A – 311A Sharp-cutoff RF/AF pentode with a 7.5 V/850 mA heater;[323] not to be confused with the Philips 329 ballast tube
331A – 125 W, 30 MHz RF/AF Power triode, μ = 40, 10 V/3.25 A filament, B4F/U4J Jumbo base, anode on top cap[335]
333A – Gas-filled, cold-cathode triode thyratron with a starter anode with a built-in 100 or 120 kΩ resistor; similar to 313A but cable-ended with lugs[336]
336A – 12 W AF Power pentode, 10 V/640 mA heater, U6A base[337]
346A/B/C – Gas-filled, cold-cathode triode thyratron, starter anode available both directly or via a built-in 120 kΩ resistor, below 5 μCi (180 kBq) of 85Kr (half-life: 10.756 years) primed, 4-pin base[344]
347A – Low-microphonics, low-noise, low-hum AF triode, 6.3 V/500 mA heater, Octal base[345]
347B – See 262A/B
348A – See 310A/B
349A – 12 W AF Power pentode, 6.3 V/1 A heater, Octal base[346]
350B – 27 W AF Beam power tetrode, 6.3 V/1.6 A heater, Octal base[347]
352A – Dual diode + triode, 10 V/320 mA heater, U6A base with triode grid on top cap[348]
353A – Gas-filled, cold-cathode triode thyratron, starter anode available both directly or via a built-in 120 kΩ resistor, <5 μCi (180 kBq) of 85Kr primed, 4-pin base[349]
354A, 355A – 1.5 kV, 4 A Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/16 A filament, 4-pin base;[350][306] not to be confused with the Philips 354 Tungar bulb
356A – 50 W, 100 MHz RF/AF Power triode, μ = 50, center-tapped 5 V/5 A filament, ventilated 4-pin base, anode on top cap;[351] not to be confused with the Machlett Labs 356 power triode
357A/B (also Machlett Labs) – 400 W, 100 MHz Forced-air cooled power triode, 10 V/10 A filament[352]
359A – Small, gas-filled, cold-cathode triode thyratron used as a latching indicator, one starter electrode, <5 µCi of 85Kr primed, 3 wire-ends[354]
363A – 350 W, 85 MHz Power pentode, center-tapped 10 V/10 A filament, ventilated 6-pin base, anode on top cap[355]
364A – 50 W, 150 MHz Power triode, center-tapped 5 V/5 A filament, ventilated 5-pin base, anode on two top caps[356]
368A (Dual grid and anode pin), 368AS (single grid and anode pin) – 20 W, 1 GHz Doorknob Power triode, Graphite anode, 1.2 V/4.5 A filament, hard glass envelope, derated up to 1.7 GHz[357]
371A/B (also Central Electronics, United Electronics) – 25 kV, 300 mA Half-wave rectifier, 5 V/10.3 A filament, B4F/U4J Jumbo base[358]
372A – Gas-filled, cold-cathode triode thyratron, starter electrode with a built-in 120 kΩ resistor, cable-ended with lugs[359]
374A – 4.8 W Power pentode, 3 V/530 mA filament, Octal base[361]
375A – 6 W Low (48-130 V) anode voltage AF beam power tetrode, 20 V/320 mA heater, Octal base[362]
376B = 5589 (226RaBr2 primed), 376C (below 5 μCi (180 kBq) of 85Kr primed) – 275 V, 20 mA (10000h lifespan), 35 mA (1000h), 200 mA (10h) Gas-filled, cold-cathode triode thyratron with a starter anode, 6-pin Octal base[363]
378A – 30 kV, 200 mA Half-wave rectifier, center-tapped 5 V/5 A filament, ventilated 4-pin base;[358] see 371A
384A (Wire-ended), 385A (Octal base) – Mushroom or Little Doorknob UHF pentode, 6.3 V/150 mA heater[364]
388A – 50 W, 400 MHz Doorknob Power triode, Graphite anode, dual grid and anode pin, 1.2 V/4-4.5 A filament, hard glass envelope, derated up to 900 MHz[357]
393A (also General Electric, National Electronics, Tung-Sol) – See 323A/B
394A – 1.25 kV, 640 mA Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/3.25 A filament, Octal base[365]
395A (also Tung-Sol) – 140 V, 35 mA (10h lifespan), 4 mA (10000h) Small, top-viewing, cold-cathode, Neon triode thyratron used as a latching indicator, 85Kr primed, all-glass 3-pin/wire-ends;[366] rugedized 727A; similar to 7323, 7400, 7401, 7979, МТХ-90
396A (also Ericsson AB) = 2C51 – Dual shielded triode, 6.3 V/300 mA heater, Noval base[367]
398A = 5603 – 8 W Power pentode, 6.3 V/500 mA filament, Octal base[368]
405A – 165 V, 40 mA (10h lifespan), 4 mA (10000h) Gas-filled, cold-cathode triode thyratron with a starter anode, cable-ended with lugs[373]
407A (2C51, 5670) – Dual medium-μ VHF triode, center-tapped 40 V/50 mA resp. 20 V/100 mA heater, Noval base;[374] similar to 20EZ7
408A = 6028 – 5654/6096/6AK5-W/E95F Sharp-cutoff pentode with a 20 V/50 mA heater, Miniature 7-pin base[375]
409A = 6AS6 – Dual-control pentode used in radar phantastron circuits, 6.3 V/175 mA heater, Miniature 7-pin base[376]
410A – 1.5 kV, 8 A Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/18 A filament[377]
411A – 180 V, 100 mApeak, 35 mAavg Gas-filled, cold-cathode tetrode thyratron with one starter anode + one starter cathode, cable-ended with lugs;[378] not to be confused with the General Electric 411 rectifier
412A – Full-wave rectifier, 6.3 V/1.0 A heater, Noval base[379]
425A – 180 V, 50 mApeak, 20 mAavg Gas-filled, cold-cathode tetrode thyratron with one starter anode + one starter cathode, below 5 μCi (180 kBq) of 85Kr (half-life: 10.756 years) primed, cable-ended with lugs[391]
426A – 180 V, 60 mA (10h lifespan), 7.5 mA (10000h) Gas-filled, cold-cathode triode thyratron, starter electrode with a built-in 120 kΩ resistor, <5 µCi of 85Kr primed, plastic right angle mounting bracket, cable-ended with lugs[392]
427A = 6141 – 100 V, 5 to 40 mA Voltage-regulator tube with a starter anode, Noval base[393]
429A – 12 W AF Beam power tetrode, 20 V/140 mA heater, 9-pin base[394]
430A – Gas-filled, cold-cathode trigger tube with two interchangeable cathodes/starters, 226RaBr2 primed, UX4 base; 313C with a shorter starter gap ionization time[395]
432A – 100 V, 4 to 8 mA Voltage-regulator tube with a starter anode, Noval base[396]
435A (Input, 6.3 V/300 mA heater, Noval base), 436A (intermediate, 6.3 V/450 mA heater, special 9-pin base) – Tetrodes[397]
446A – 81 V, 5 to 40 mA Voltage-regulator tube with a starter anode, 85Kr primed, Noval base;[403] not to be confused with the General Electric, RCA 446A triode
447A – Gas-filled, cold-cathode voltage-regulator or visual trouble indicator tube, <5 µCi of 85Kr primed, Noval base[404]
448A, 448B (Aquadag coated), 454A (shortened anode pin) – Tetrodes, 6.3 V/450 mA heater, special 9-pin base[405]
451A – 180 V, 50 mApeak, 20 mAavg Gas-filled, cold-cathode tetrode thyratron with one starter anode + one starter cathode, <5 µCi of 85Kr primed, Noval base;[406] not to be confused with the Philips 451 Tungar bulb
453A – 83 V, 4 to 6 mA Voltage-regulator tube, Noval base[407]
455A to 455F – Ultra high reliability pentodes used in 6-tube submarine communications cable repeaters,[408] gm = 6 mS, Gold-plated Beryllium-Copper stranded wire ends; derived from the 175HQ
456A – Gas-filled, cold-cathode voltage limiter used in repeaters to bypass the 455A heater in case of breakage
703A (also Tung-Sol) – 20 W, 1.5 GHz Directly heated Doorknob power triode, 1.15 V/4.5 A filament;[417] 368AS with tightened cut-off specs
704A – 1.5 kV, 10 mA UHF diode, half-indirect 4.5 V/500 mA heater, Peanut all-glass with 3 wire-ends, anode on top wire[418]
705A (also GE, Raytheon, Tung-Sol) = 8021 (378A) – 30 kV, 100 mA Directly heated half-wave EHT rectifier with electrodes supported directly from the hard glass envelope, no internal insulators, 5 V/5 A filament, B4A ventilated 4-pin base with anode on top cap[419]
708A (also Tung-Sol) – Flying saucer tube, a directly heated SHF power triode used as grounded-grid RF amplifier or mixer in 1...3 GHz radar receivers, μ=10, 1.7 V/1.85 A filament, grid connected to the flanged steel envelope[422]
712A – Reflex Klystron; superseded by 707A[412]: 179
713A – Indirectly heated Mushroom or Little Doorknob UHF pentode, Bakelite Octal base, 6.3 V/175 mA heater,[424] used as a low-noise front end in radar receivers; superseded by 6AK5/EF95
714AY (also Westinghouse) – S-band Magnetron;[425] further modernized 700; not to be confused with the National Electronics, RCA 714 thyratron
715B/C (also Raytheon, RCA) = STC P535-1E (5D21) – 60 W Pulse-rated power tetrode used in hard-tube pulser modulators, UAmax = 15 kV, half-indirect 26 V/2.1 A heater, B4A ventilated 4-pin base with anode on top cap[426][414]
716A – Thyratron; superseded by 722A; not to be confused with the RCA 716 thyratron
717A (also Raytheon) (CV3594, VT269) – 713A with a metal shield and a Micanol Octal base;[427][424] superseded by 6AK5/EF95
718AY/EY (also Westinghouse) – S-band Magnetron;[412]: 180 further modernization of the 700-type Magnetrons
719A – 25 kV, 500 mAavg, 10 Apeak Half-wave pulse-rated EHT rectifier, half-indirect 7 V/7 A heater, B4A ventilated 4-pin base with anode on top cap,[428] used as a clipper in radar applications, not recommended as rectifier
720AY-EY – S-band Magnetron;[429][412]: 180 AY variant superseded by 4J45; BY superseded by 4J46; CY superseded by 4J47
181 – Indirectly heated power triode, UX4 base with 2 side contacts
485 – Indirectly heated triode, circa 1929; similar to types 56 and 76, but with a 3.0 V/1.3 A heater, and lower anode voltage
5-volts filament
482B = 182B (Replacements commonly branded as 182B/482B) – Directly heated power triode, 5.0 V/1.25 A filament, circa 1929; similar to type 71-A, but with higher anode voltage
483 = 183 (Replacements commonly branded as 183/483) – Directly heated power triode, circa 1929; similar to type 45, but with a 5.0 V/1.25 A filament
In the early 1930s, the Grigsby-Grunow Company – makers of Majestic brand radios – introduced the first American-made tubes shielded European-style by metal particles sprayed onto the glass envelope. Early types, except power tubes and most rectifiers, were spray-shielded versions of already existing tubes. The shield was tied to the cathode or, later, to a separate base pin so that it could be connected directly to the chassis. The Majestic numbers of these tube types, which are usually etched on the tube's base, have a "G" prefix (for Grigsby-Grunow) and an "S" suffix (for shielded).[30]: 178ff
Replacement versions from other manufacturers, such as Sylvania, Tung-Sol or General Electric, tend to incorporate the less expensive, form-fitting Goat brand shields that are cemented to the glass envelope.
Early types derived from existing tubes
Non-shielded versions may be used, but add-on shielding is recommended
G-56A-S – G-56-S with a 6.3 V/400 mA heater; forerunner of type 76
G-57-S – Sharp-cutoff pentode, 2.5 V/1.0 A heater
G-57A-S – G-57-S with a 6.3 V/400 mA heater; forerunner of type 6C6
G-58-S – Remote-cutoff pentode, 2.5 V/1.0 A heater
G-58A-S – G-58-S with a 6.3 V/400 mA heater; forerunner of type 6D6
G-85-S – G-55-S with a 6.3 V/300 mA heater
Proprietary tubes
G-2 (2.5 V/1.75 A heater), G-2-S (spray-shielded), G-4 (smaller, 2.5 V/1.0 A heater), G-4-S (spray-shielded) – First commercially available dual diodes, common cathode, UY5 base; later Sylvania replacement type 2S/4S has a 1.35 A heater; forerunners of Octal type 6H6
G-84 = 2Z2 – Half-wave rectifier, 2.5 V/1.5 A filament, UX4 base; a lower-voltage variant of type 81; not related to type 84/6Z4
AC2 – Triode used as AF amplifier or as oscillator together with an AH1 mixer, side-contact 8 base with triode grid on top cap; EC2 with a 4 V/650 mA heater
AC50 = Philips 4686 – 300 V, 3 mAavg, 300 mApeakArgon triode thyratron, negative control characteristic, used as relaxation oscillators up to 50 kHz, 600 mA heater, side-contact 8 base with grid on top cap
AC100 – Triode used as AF amplifier or as oscillator together with an AH100 mixer, 650 mA heater; AC2 with a P5A German PTT 5-pin base
AC101 – Triode used as AF amplifier or as oscillator together with an AH100 mixer, 650 mA heater; AC2 with an O5A European 5-pin base
AC102 – Triode, 650 mA heater, P7A German PTT 7-pin base with 2 unused pins
AC104 – Triode, 1 A filament, O5A European 5-pin base[444]
AC701 – Subminiature AF triode used in condenser microphonepreamplifiers, 100 mA heater, all-glass with 4 wire-ends with grid on top wire
AC761 – Subminiature AF triode used in microphone preamplifiers, 105 mA heater, all-glass with 4 wire-ends with grid on top wire
AN1 = M-OV/GEC GT1C – -1300 to +650 Va, 300 mAavg, 2 Apeak, 15 Asurge Gas-filled triode thyratron, negative control characteristic, for industrial control systems, 1.45 A heater, O5A European 5-pin base
CC2 – Triode used as AF amplifier or as oscillator together with an CH1 mixer, side-contact 8 base with triode grid on top cap; AC2 with a 13 V/200 mA heater
DAH50 – Diode + low (15-25 V) anode voltage pentode with extra beam-forming rods and a space charge grid between cathode and control grid (technically a heptode), center-tapped 2.8 V/25 mA resp. 1.4 V/50 mA filament, Octal base with control grid on top cap; cf. Shadow-grid
DF51 – Miniature sharp-cutoff RF/IF pentode, half-indirect 1.5 V/70 mA heater, B4B 4-pin subminiature base with anode on top cap;[458] similar to KE50
Note: DF60, DF61, DF62, DF63 and DF703 have a split suppressor grid, its halves tied to the positive resp. negative filament end
DF60/5678 – Subminiature shielded sharp-cutoff RF/IF/AF pentode, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF61 – Subminiature shielded sharp-cutoff RF or mixer pentode, 1.25 V/25 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF62/1AD4 – Subminiature shielded sharp-cutoff RF/IF pentode, 1.25 V/100 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF63 – Subminiature shielded remote-cutoff RF/IF pentode, 1.25 V/25 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF64 – Subminiature AF pentode used in hearing aids, 625 mV/10 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF65 – Subminiature AF pentode used in hearing aids, 625 mV/13.3 mA filament, all-glass round cross-section envelope, circular 5-pin/wire-ends base
DF66 – Subminiature AF pentode used in hearing aids, 625 mV/15 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF67/6008 – DF65 with round cross-section envelope, but 5 inline wire-ends
DF70 – Subminiature AF pentode used in hearing aids, 625 mV/25 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DF72 – Subminiature sharp-cutoff RF/IF pentode, 1.25 V/25 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DF73 – Subminiature remote-cutoff RF/IF pentode, 1.25 V/25 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DF91/1T4 – Remote-cutoff RF/IF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
DF92/1L4 – Sharp-cutoff RF/IF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
DF96/1AJ4 – Remote-cutoff RF/IF pentode, 1.4 V/25 mA filament, Miniature 7-pin base
DF97/1AN5 – Dual-control, remote-cutoff RF/IF/mixer pentode, 1.4 V/25 mA filament, Miniature 7-pin base
DF161 – Subminiature AF pentode used in hearing aids, all-glass wire-ended
DF167 – Subminiature AF pentode used in hearing aids, 625 mV/13.3 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DF191 – RF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
DF650 = Raytheon CK538DX – Subminiature AF pentode used in hearing aids, 625 mV/15 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends[459]
DF651 = Raytheon CK549DX – DF650 with a 625 mV/10 mA filament
DF668 – Subminiature RF pentode, 1.25 V/100 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends; similar to DF62/1AD4
DF669 – Subminiature RF/IF pentode, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 inline wire-ends; similar to DF60/5678
DF703/5886 – Subminiature electrometer pentode used in probe amplifiers, 1.25 V/10 mA filament, all-glass elliptical cross-section envelope with a moisture-repellent coating and 5 long inline wire-ends
DF904/1U4/5910 – Sharp-cutoff SW/VHF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
DF906 – Sharp-cutoff SW/VHF pentode, 1.4 V/100 mA filament, Miniature 7-pin base
DF961 – Sharp-cutoff SW/VHF pentode, 1.2 V/60 mA filament, Miniature 7-pin base
DK1 – Octode pentagrid converter with control (#4) grid on top cap, 1.5 V/50 mA filament, side-contact 8 base[461]
DK21 – Remote-cutoff beam octode pentagrid converter with control (#4) grid on top cap and suppressor (#6) grid internally tied to the negative 1.4 V/50 mA filament end, Octal base with filament between nonstandard pins 1 and 8
DK22 – Octode pentagrid converter with suppressor (#6) grid internally tied to the negative 1.2 V/50 mA filament end, B8G Loctal base[462]
DK25 – Remote-cutoff octode pentagrid converter, 1.2 V/50 mA filament, B8G Loctal base
DK31 – Remote-cutoff octode pentagrid converter with suppressor (#6) grid internally tied to the negative 1.4 V/50 mA filament end, Octal base[462]
DK32/1A7-GT – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 1.4 V/50 mA filament, Octal base
DK40 – Remote-cutoff octode pentagrid converter with suppressor (#6) grid internally tied to the positive 1.4 V/50 mA filament end, Rimlock base
DK91/1R5 – Remote-cutoff heptode pentagrid converter with American grid topology and suppressor (#5) grid internally tied to the negative 1.4 V/50 mA filament end, Miniature 7-pin base
DK92/1AC6 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the positive 1.4 V/50 mA filament end, Miniature 7-pin base
DK96/1AB6 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the positive 1.4 V/25 mA filament end, Miniature 7-pin base
DK97 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the negative 1.4 V/25 mA filament end, Miniature 7-pin base
DK192 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the positive 1.4 V/50 mA filament end, Miniature 7-pin base
DK962 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the positive 1.2 V/60 mA filament end, Miniature 7-pin base
DL1 – Power pentode, 1.4 V/50 mA filament, side-contact 8 base
DL2 – Power pentode, 1.4 V/100 mA filament, side-contact 8 base[463]
DL11 – 1 W AF power pentode, wide-range 0.9-1.5 V/50 mA filament, Y8A steel tube base with 2 unused pins
DL21 – 700 mW AF power pentode, Octal base with 1.4 V/50 mA filament between nonstandard pins 1 and 8; similar to EdiSwan PEN141
DL22 – 1 W Power pentode, 1.2 V/100 mA filament, B8G Loctal base[464]
DL25 – Power pentode, 1.2 V/100 mA filament, B8G Loctal base
DL26 – Power pentode, 1.2 V/100 mA filament, B8G Loctal base
DL29/3D6 – 4.5 W, 50 MHz Beam power pentode, center-tapped 2.8 V/110 mA resp. 1.4 V/220 mA filament, B8G Loctal base
DL31/1A5 – 115 mWoutput Power pentode, 1.4 V/50 mA filament, Octal base[464]
DL33/3Q5-GT – 270 mWoutput AF power pentode, suppressor grid tied to the center-tap of the 2.8 V/50 mA resp. 1.4 V/100 mA filament, Octal base
DL35/1C5-GT – 240 mWoutput Power pentode, 1.4 V/100 mA filament, Octal base
DL36/1Q5-GT – DL33/3Q5-GT Power pentode with the suppressor grid tied to the negative side of the 1.4 V/100 mA filament[463]
DL41 – 1.2 W Power pentode, center-tapped 2.8 V/50 mA resp. 1.4 V/100 mA filament, Rimlock base
DL41w – Pressed Cup-type power pentode, 1.2 V/50 mA filament[37]
DL51 – Miniature power pentode, half-indirect 1.5 V/130 mA heater, B4B 4-pin subminiature base with anode on top cap
DL64 – 950 µWoutput Subminiature AF power pentode used in hearing aids, UA = 15 V, UAmax = 45 V, 1.25 V/10 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL65 – 25 mW Subminiature AF power pentode used in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/13 mA filament, all-glass round cross-section envelope, circular 5-pin/long wire-ends base; DL67/6007 with a different pinout
DL66 – 16.5 mWoutput Subminiature AF power pentode used in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/15 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL67/6007 – DL65 with round cross-section envelope, but 5 inline wire-ends
DL68 – 100 mW Subminiature AF power pentode used in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/25 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL69 – 50 mWoutput Subminiature power pentode with a split suppressor grid, its halves tied to the positive resp. negative filament end, UA = 90 V, 1.25 V/25 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL70 – 1 W, 200 MHz Subminiature power pentode used in walkie-talkies, UA = 150 V, 1.25 V/110 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DL71 – 30 mW Subminiature AF power pentode used in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/25 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DL72 – 60 mW Subminiature AF power pentode used in hearing aids, UAmax = 45 V, 1.25 V/25 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base
DL73 – 2 W, 200 MHz Subminiature power pentode used in walkie-talkies, UA = 150 V, 1.25 V/200 mA filament, all-glass round cross-section envelope, circular 8-pin/wire-ends base; similar to CV2299
DL75 – Subminiature AF power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base[465]
DL91/1S4 – 700 mW AF power pentode, 1.4 V/100 mA filament with the suppressor grid tied to the negative side, Miniature 7-pin base
DL92/3S4 – DL91/1S4 with the suppressor grid tied to the center-tap of the 2.8 V/50 mA resp. 1.4 V/100 mA filament
DL93/3A4 – 2 W, 50 MHz power pentode, center-tapped 2.8 V/100 mA resp. 1.4 V/200 mA filament, Miniature 7-pin base
DL94/3V4 – 1.2 W AF power pentode, center-tapped 2.8 V/50 mA resp. 1.4 V/100 mA filament, Miniature 7-pin base
DL95/3Q4 – DL94/3V4 with a different pinout
DL96/3C4 – 600 mW AF power pentode, center-tapped 2.8 V/25 mA resp. 1.4 V/50 mA filament, Miniature 7-pin base
DL97/3Y4 – Power pentode, center-tapped filament, Miniature 7-pin base[466]
DL98/3B4 – 3 W, 100 MHz Power pentode, center-tapped 2.5 V/165 mA resp. 1.25 V/330 mA filament, Miniature 7-pin base
DL161 – Subminiature AF power pentode used in hearing aids, all-glass wire-ended
DL167 – 25 mW Subminiature AF power pentode used in hearing aids, 1.25 V/13.3 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL192 – 850 mW AF power pentode, center-tapped 2.8 V/50 mA resp. 1.4 V/100 mA filament, Miniature 7-pin base
DL193 – 1.5 W AF power pentode, center-tapped 1.4 V/200 mA filament, Miniature 7-pin base
DL620 – 110 mW Subminiature power pentode, UAmax = 90 V, 1.25 V/50 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL650 = Raytheon CK532DX – 45 mW Subminiature power pentode, UAmax = 30 V, 1.25 V/15 mA filament, all-glass elliptical cross-section envelope with 5 long inline wire-ends
DL651 = Raytheon CK546DX – DL650 with a 1.25 V/10 mA filament
DL761 – Subminiature RF power pentode, center-tapped 2.5 V/110 mA resp. 1.25 V/55 mA filament, all-glass wire-ended; similar to 6397
DL907 – 2 W SW/VHF power pentode, 1.4 V/200 mA filament, Miniature 7-pin base
DL962 – DL192 AF power pentode with a center-tapped 2.4 V/60 mA resp. 1.2 V/120 mA filament
DL963 – DL193 power pentode with a center-tapped 2.4 V/100 mA resp. 1.2 V/200 mA filament
DLL21 (Octal base with filament between 7 and nonstandard pins 1, 8), DLL25 (B8G Loctal base) – 2×500 mW Dual AF power pentode, center-tapped 2.8 V/100 mA resp. 1.4 V/200 mA filament
DLL31 – DLL21 with a different pinout
DLL101 – Dual power pentode, 1.4 V/100 mA filament, Miniature 7-pin base
DM21 – Top-view, "Magic Eye"-type tuning indicator, Octal base with 1.4 V/25 mA filament between nonstandard pins 1 and 8
DM70/1M3 (Long wires), DM71/1N3 (short wires) – Subminiature, side-view, single segment, vari-μ vacuum fluorescent display used as analog, band-and-dot-type tuning/level indicator, 1.4 V/25 mA filament, all-glass round cross-section envelope, B8D circular 8-pin/wire-ends base
DM160/6977 – First commercially available, digital vacuum fluorescent display, side-view, single segment, used as flip-flop status indicator in transistorized computers, 1 V/30 mA filament, all-glass wire-ended; similar to ИВ-15↦IV-15; cf. 8569
DY30/1B3-GT = 1Ц7С↦1C7S – 30 kV CRT EHT rectifier, 1.25 V/200 mA filament, Octal base with anode on top cap
DY51/1BG2 – 15 kV CRT EHT rectifier used in portable TV receivers, half-indirect 1.4 V/25 mA heater, all-glass, filament wires on one end, anode wire on the other
DY70 – 10 kV CRT EHT rectifier, 1.25 V/140 mA filament, all-glass with 3 wire-ends, anode on top wire
DY80/1X2A – 23 kV CRT EHT rectifier, 1.25 V/200 mA filament, Noval base
DY86/1S2 = 1Ц21П↦1C21P – 22 kV, 800 µA Half-indirectly heated CRT EHT rectifier, Noval base with anode on top cap; EY86/6S2 or GY86 with a 1.4 V/550 mA heater
DY87/1S2A – DY86/1S2 variant for operation at high altitudes with a silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions; EY87/6S2A with a 1.4 V/550 mA heater
DY802/1BQ2 – 20 kV Half-indirectly heated CRT EHT rectifier, Noval base, silicone-coated envelope; EY802 or GY802 with a 1.4 V/600 mA heater
DY900 – 16 kV CRT EHT rectifier, half-indirect 1.4 V/600 mA heater, Miniature 7-pin base
EAA11 – Dual diode, 350 mA heater, Y8A steel tube base
EAA91/6AL5 = M-OV/GEC D77 = 6Х2П↦6H2P – Dual diode with separate cathodes, Miniature 7-pin base; HAA91/12AL5, UAA91 or XAA91/3AL5 with a 6.3 V/300 mA heater; EB91 with a shorter envelope
EAA171 – Gnome Dual diode, separate cathodes and separate heaters; UAA171 with a 6.3 V/360 mA heater
EABC80/6AK8 = M-OV/GEC DH719 – Triple diode + high-μ triode on common cathode with two of the diodes used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in post-war European AM/FM radios, triode μ = 70, Noval base; 6T8, 6T8A with a longer glass envelope; (5T8), HABC80 (19T8), PABC80/9AK8 or UABC80/27AK8 with a 6.3 V/450 mA heater
EAM86/6GX8 – Diode + side-view, horizontal band-type tuning/level indicator, 300 mA heater, Noval base - the diode is to rectify the audio signal when indicating a recording level or a modulation depth
EBC1 – Dual diode + AF triode, side-contact 8 base with triode grid on top cap; ABC1 with a 6.3 V/400 mA heater
EBC3 – Common cathode dual diode + AF triode, 200 mA heater, side-contact 8 base with triode grid on top cap
EBC11 – Common cathode dual diode + AF triode, 200 mA heater, Y8A steel tube base
EBC33 – Common cathode dual diode + AF triode; EBC3 with an Octal base; similar to 6Q7-G
EBC41/6CV7 – Shielded common cathode dual diode + AF triode; UBC41/14L7 with a 6.3 V/230 mA heater; EBC81/6BD7A with a Rimlock base
EBC80/6BD7 – Shielded dual diode + AF triode, 230 mA heater, Noval base
EBC81/6BD7A – Shielded common cathode dual diode + AF triode; UBC81/14G6 with a 6.3 V/230 mA heater; EBC41 with a Noval base
EBC90/6AT6 – Common cathode dual diode + high-μ AF triode used in FM ratio detectors, triode μ = 70, Miniature 7-pin base; HBC90/12AT6 with a 6.3 V/300 mA heater
EBC91/6AV6 – Common cathode dual diode + high-μ AF triode used in FM ratio detectors, triode μ = 100 (triode section similar in characteristics to one half of a ECC83/12AX7), Miniature 7-pin base; HBC91/12AV6 with a 6.3 V/300 mA heater
EBF1 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, 300 mA heater, side-contact 8 base with control grid on top cap;[467] similar to 6B7
EBF2 – Common cathode dual diode + Selektode remote-cutoff RF/IF/AF pentode with control grid on top cap, 200 mA heater; EBF11 or EBF3x with a side-contact 8 base
EBF2G, EBF2G/GT – EBF2 with an Octal base, heater between nonstandard pins 1 and 8
EBF11 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode; EBF2 or EBF3x with a Y8A steel tube base; VBF11 with a 6.3 V/200 mA heater
EBF15 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, Y8A steel tube base; UBF15 with a 6.3 V/470 mA heater
EBF21 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, 330 mA heater, B8G Loctal base[468]
EBF32 – EBF2G with heater between standard pins 2 and 7; similar to 6B8-G
EBF35 – EBF2G with different cathode, suppressor grid and shield connections on pins 2 and 7
EBF80/6N8 = M-OV/GEC WD709 – Common cathode dual diode + remote-cutoff pentode, 300 mA heater, Noval base
EBF81/6AD8 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, 300 mA heater, Noval base
EBF83/6DR8 – Common cathode dual diode + low (6.3-50 V) anode voltage sharp-cutoff pentode used as IF amplifier, detector and AGC diode in vehicle equipment, 300 mA heater, Noval base
EBF89/6DC8 – Common cathode dual diode + semiremote-cutoff RF/IF pentode, 300 mA heater, Noval base
EBF171 – Dual diode + remote-cutoff RF/IF/AF pentode - the first Gnome tube; a modified and repackaged EBF11; UBF171 with a 6.3 V/320 mA heater
EBF175 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode,[469] prototype only
EC40 – 500 MHz VHF triode, 300 mA heater; EC80 with a Rimlock base
EC41 – UHF oscillator triode, 200 mA heater; EC81 with a Rimlock base
EC50 – 1 kV, 10 mAavg, 750 mApeak Helium triode thyratron, negative control characteristic, used as a horizontal sweep, sawtooth waveform generator in oscilloscopes, 1.3 A heater, side-contact 8 base with anode on top cap
EC52 – RF triode used as an oscillator, 430 mA heater, B9G 9-pin Loctal base
EC53 – 600 MHz VHF triode used as an oscillator, 250 mA heater, 3-pin base with grid and anode on top pins
EC54 – Triode, 450 mA heater, B9G 9-pin Loctal base[472]
EC57 (EC157) – Lighthouse-type disk-seal microwave triode, 650 mA heater
EC70/6AK4/6778 (6K4) – 750 mW, 500 MHz Subminiature UHF triode used as an oscillator, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EC71/5718 – 1 GHz Subminiature UHF triode used as an oscillator in the 500 MHz range, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EC80/6Q4 – 500 MHz VHF Triode, 430 mA heater, Noval base
EC81/6R4 – UHF oscillator triode, 175 mA heater, Noval base
EC84/6AJ4 – High-μ triode, 225 mA heater, Noval base
EC86/6CM4 – UHF triode used in TV tuners as a self oscillating mixer, Noval base; PC86/4CM4 with a 6.3 V/200 mA heater
EC88/6DL4 – UHF triode used in TV tuners, Noval base; PC88/4DL4 with a 6.3 V/165 mA heater
EC90/6C4 (6100) – 3.6 W, 150 MHz Small-power VHF triode, single ECC82/12AU7 system, 150 mA heater, Miniature 7-pin base
EC91/6AQ4 – 250 MHz VHF triode, 300 mA heater, Miniature 7-pin base
EC92/6AB4/6664 – VHF triode for FM receiver front ends, single ECC81/12AT7 system, Miniature 7-pin base; UC92/9AB4 with a 6.3 V/150 mA heater
EC162 – RF power triode, 2.2 A heater, Y8A steel tube base
EC360 (Center-tapped 6.3 V/1.9 A resp. 12.6 V/950 mA heater), EC362 (450 mA heater, anode on top cap) – Power triodes used in power supplies, Octal base
EC560 – Lighthouse-type disk-seal microwave triode, 700 mA heater; similar to 2C40
EC760 – 500 MHz Subminiature VHF oscillator/mixer triode, 150 mA heater, all-glass round cross-section envelope, circular 7-pin/wire-ends base; similar to EC71/5718
EC860iII – 1 kV, 20 mAavg, 500 mApeak Grid-turn-off Helium triode thyratron, negative control characteristic, e.g. for relaxation oscillators up to 150 kHz, 1.4 A heater, Noval base; cf. 6441, 20TC4, 30TC1
EC866 – Low-noise UHF triode, 155 mA heater, Noval base
EC900/6HM5/6HA5 – Shielded, frame-grid vari-μ VHF triode, Miniature 7-pin base; LC900/3HM5/3HA5, PC900/4HM5/4HA5 or XC900/2HM5/2HA5 with a 6.3 V/180 mA heater
EC903 – RF/IF Triode, 185 mA heater, Miniature 7-pin base[474]
EC1000/8254 – Ruggedized, subminiature triode used as amplifier in probes, 185 mA heater, 8-pin all-glass wire-ended with grid on top wire
EC1010 – Miniature, ceramic/metal, disk-seal planar UHF triode, 135 mA heater; similar to 6С53Н↦6S53N
EC1030 (B8D 8 circular, 38 mm long, tinned wire-ends), EC1031 (5.5 mm long Gold-plated pins for insertion into a special socket) – Subminiature UHF triode, Silicon-free 128 mA heater, all-glass round cross-section envelope
EC8010/8556 – 1 GHz Ruggedized, long-life (>10000h) UHF triode used as amplifier or oscillator, Silicon-free 280 mA heater, Noval base
EC8020 – Ruggedized, long-life (>10000h) UHF triode, Silicon-free 280 mA heater, heater, Noval base
E20C – RF Triode for wideband cascode circuits, 450 mA heater, B8G Loctal base[448]
E86C = EC806S – 800 MHz Ruggedized, long-life (>10000h) UHF triode, dual anode and cathode pins and triple grid pins used as grounded-grid amplifier, Silicon-free 165 mA heater, Noval base with Gold-plated pins
E88C/8255 – 1 GHz Ruggedized, long-life (>10000h) UHF triode, quintuple grid pins used as grounded-grid amplifier, Silicon-free 155 mA heater, Noval base
ECC31 – Common cathode dual AF power triode, 1 A heater, Octal base[475]
ECC32/6SN7-G – Separate cathodes dual AF triode, μ = 32, 950 mA heater, Octal base; similar to 6Н8С↦6N8S
ECC33 – Separate cathodes dual high-μ triode used as a flip-flop, μ = 35, 400 mA heater, Octal base
ECC34 – Separate cathodes dual triode used as a CRT vertical deflection oscillator+amplifier, μ = 11.5, 950 mA heater, Octal base
ECC35/6SL7 – Separate cathodes dual high-μ AF triode, μ = 68, 400 mA heater, Octal base; similar to 6Н9С↦6N9S
ECC40 – Separate cathodes dual AF triode, μ = 32, 600 mA heater, Rimlock base
ECC70/6021 (6BF7) – Subminiature, separate cathodes dual VHF medium-μ triode, μ = 35, 300 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
ECC81/12AT7 = M-OV/GEC B309ECC83/12AX7 (6060, 6201, M8162) – Dual high-μ triode used as RF amplifier/mixer in VHF circuits, μ = 60, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
ECC82/12AU7 = M-OV/GEC B329 (6067, 6189, M8136) – Dual medium-μ triode used as AF amplifier, μ = 17, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base; XCC82/7AU7 with a different heater. Two EC90/6C4s in one envelope;[96] however, it is only specified as an audio frequency tube
ECC83/12AX7 = M-OV/GEC B339 (6Н2П↦6N2P, 6057, 6681, M8137) – Dual high-μ triode used as a high-gain AF amplifier, μ = 100, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
ECC84/6CW7 = 6Н14П↦6N14P – Dual VHF triode for grounded-grid/cascode amplifiers in TV tuners, section 1 cathode is tied to two adjacent pins and the screen between the two sections is internally tied to the section 2 grid, μ = 24, Noval base; PCC84/7AN7 or UCC84 with a 6.3 V/330 mA heater
ECC85/6AQ8 – 200 MHz Dual triode used as VHF oscillator/mixer, μ = 57, Noval base; HCC85/17EW8, PCC85/9AQ8 or UCC85 with a 6.3 V/435 mA heater
ECC86/6GM8 = 6Н27П↦6N27P – Dual low (6.3-25 V) anode voltage VHF triode used in FM tuners in vehicle equipment, μ = 14, 330 mA heater, Noval base
ECC87 (E80CC/6085) – ECC40 with a Noval base, allowing for a heater center-tap[476]
ECC88/6DJ8 = 6Н23П↦6N23P – Dual VHF triode used as cascode amplifier in TV tuners and receiver front ends, or as general-purpose instrumentation dual triode, μ = 33, Noval base; PCC88/7DJ8 with a 6.3 V/365 mA heater
ECC89/6FC7 = 6Н24П↦6N24P – Dual VHF triode used as cascode amplifier in TV tuners and receiver front ends, or as general-purpose instrumentation amplifier, 365 mA heater, Noval base
All ECC8x have separate cathodes
ECC81, 82, 83 & 87 have the individual 6.3-volts triode heaters internally series-connected, with the midpoint on a separate pin, so they could be run on both 6.3 V and 12.6 V (hence RETMA lists them as 12-volts types)
All other ECC8x have no heater midpoint tap; ECC85, 86 & 88 have the freed-up pin being used for an internal screen between the sections
ECC91/6J6 = 6H15П↦6N15P (6030) – 600 MHz Common cathode dual VHF triode, μ = 38, 450 mA heater, Miniature 7-pin base
ECC99 – Separate cathodes dual RF triode, Noval[449] base
ECC171 – Gnome Separate cathodes and separate heaters dual triode with internal shield, prototype only; UCC171 with a different heater
ECC180/6BQ7A – Separate cathodes dual VHF triode used as cascode amplifier, μ = 39, 400 mA heater, Noval base; similar to 6Н1П↦6N1P
ECC186/7316 – Separate cathodes dual triode used in digital computers, μ = 17, Silicon-free, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
ECC189/6ES8 – Separate cathodes dual vari-μ VHF triode used as cascode amplifier, Noval base; PCC189/7ES8, XCC189/4ES8 or YCC189/5ES8 with a 6.3 V/365 mA heater
ECC230/6AS7-G = 6Н13С↦6N13S (6080) – Separate cathodes dual low-μ power[449] triode used as series-pass regulator in stabilized DC power supplies, servo systems, or as a horizontal booster triode in TV monitors, μ = 2, 2.5 A heater, Octal base
ECC802 – Separate cathodes dual triode, 300 mA heater, Noval base
ECC803 – Separate cathodes dual triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
ECC804/6GA8 – Separate cathodes dual triode, 300 mA heater, Noval base[477]
ECC807 – Separate cathodes dual AF triode for high-gain preamplifiers, 300 mA heater, Noval base
ECC808/6KX8 – Separate cathodes dual AF triode used as record head output tube in tape recorders, 340 mA heater, Noval base
ECC812 – Separate cathodes dual shielded triode for color TV chrominance outputs in SECAM TV receivers, 430 mA heater, Noval base
ECC813 (6463) – Separate cathodes dual triode for computer circuits, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
ECC832/12DW7 (7247) – Dual dissimilar (μ = 100 and 20) AF triode, a combination of one ECC82/12AU7 system for use as a high-gain amplifier and one ECC83/12AX7 system for use as a phase inverter or cathode follower, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
ECC863 – Separate cathodes dual triode with an internal screen between the sections, 330 mA heater, Noval base
ECC865 – Long-life version of type ECC85
ECC960, ECC962 – Common cathode dual triode used as a flip-flop in computers, 400 mA heater, Miniature 7-pin base
ECC2000 – 300 MHz Ruggedized, long-life (>10000h), separate cathodes dual VHF triode with neutralization screen used as cascode amplifier, 335 mA heater, Decal base with Gold-plated pins
ECC8100 – Ruggedized, long-life (>10000h), separate cathodes dual VHF triode used as cascode amplifier, neutralization screen ("Neutrode") connected to the Silicon-free 330 mA heater, Noval base
E80CC/6085 – Ruggedized, long-life (>10000h), separate cathodes dual triode used as DC or AF amplifier, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
E81CC/6201 = ECC801S = 12AT7-WA (6060) – 300 MHz Ruggedized, long-life (>10000h), separate cathodes dual triode used in AF and RF amplifiers, mixers, oscillators or impulse circuits, Silicon-free, center-tapped 6.3 V/300 mA resp. 12.6 V/150 mA heater, Noval base; premium version of ECC81/12AT7
E82CC/6189 = ECC802S = 12AU7-WA (6067) – Ruggedized, long-life (>10000h), separate cathodes dual triode used as amplifier or multivibrator, μ = 17, Silicon-free, center-tapped 6.3 V/300 mA resp. 12.6 V/150 mA heater, Noval base; premium version of ECC82/12AU7
E83CC/6681 = 12AX7-WA (ECC803S/6057) – Ruggedized, long-life (>10000h), separate cathodes low-microphonics dual triode, Silicon-free, center-tapped 6.3 V/300 mA resp. 12.6 V/150 mA heater, Noval base; premium version of ECC83/12AX7
E86CC/6463 – Long-life (>10000h), separate cathodes dual triode for computer circuits, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
E88CC/6922 – Ruggedized, long-life (>10000h), separate cathodes dual VHF triode used as cascode amplifier, Silicon-free 300 mA heater, Noval base with Gold-plated pins
E90CC/5920 – Long-life (>10000h), common cathode dual triode used as a flip-flop in computers, Silicon-free 400 mA heater, Miniature 7-pin base
E92CC – Long-life (>10000h), common cathode dual triode used as a flip-flop in computers, Silicon-free 400 mA heater, Miniature 7-pin base, not recommended where low hum or microphony or noise is critical
E180CC/7062 – Long-life (>10000h), separate cathodes dual triode used as a flip-flop in computers, Silicon-free, center-tapped 6.3 V/400 mA resp. 12.6 V/200 mA heater, Noval base, not recommended where low hum or microphony or noise is critical
E181CC/7118 – Separate cathodes dual triode used in digital computers, Silicon-free, center-tapped 6.3 V/400 mA resp. 12.6 V/200 mA heater, Noval base, not recommended where low hum or microphony or noise is critical
E182CC/7119 – Separate cathodes dual triode used as a flip-flop in computers, Silicon-free, center-tapped 6.3 V/640 mA resp. 12.6 V/320 mA heater, Noval base, not recommended where low hum or microphony or noise is critical
E188CC/7308 – Ruggedized, separate cathodes dual low-microphonics triode used as RF/IF/AF amplifier, 335 mA heater, Noval base with Gold-plated pins
E283CC – Ruggedized, long-life (>10000h), separate cathodes dual low-hum, low-microphonics triode used as AF or instrumentation amplifier, Silicon-free 330 mA heater, Noval base
E288CC/8223 – Ruggedized, long-life (>10000h), separate cathodes dual triode used in wideband, low-noise IF, RF and cascode amplifiers, Silicon-free 475 mA heater, Noval base with Gold-plated pins
ECF1 – AF Triode + remote-cutoff IF pentode, 200 mA heater, side-contact 8 base with pentode control grid on top cap
ECF12 – Triode + sharp-cutoff pentode used as RF amplifier and superregenerative FM demodulator, Y8A steel tube base; UCF12 with a 6.3 V/300 mA heater
ECF80/6BL8 = 6Ф1П↦6F1P – VHF Triode/pentode oscillator/mixer, Noval base; LCF80/6LN8, PCF80/9A8, UCF80 or XCF80/4BL8 with a 6.3 V/430 mA heater
ECF82/6U8 – VHF Triode/pentode oscillator/mixer, Noval base; PCF82/9U8A or XCF82/5U8 with a 6.3 V/450 mA heater
ECF83 – Low-microphonics VHF triode/remote-cutoff pentode oscillator/mixer for vehicle equipment, 400 mA heater, Noval base
ECF86/6HG8 – VHF Frame-grid, medium-μ triode/sharp-cutoff pentode oscillator/mixer, Noval base; LCF86/5HG8, PCF86/7HG8, 8HG8 or XCF86/4HG8 with a 6.3 V/390 mA heater
ECF174 – Gnome Triode + pentode, prototype only; UCF174 with a different heater
ECF200/6X9 – Triode + sharp-cutoff pentode used as combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and audio-IF or video amplifier, Decal base; LCF200/5X9 or PCF200/8X9 with a 6.3 V/410 mA heater
ECF201/6U9 – Triode + remote-cutoff pentode used as CRT vertical deflection oscillator or combined sync sep/clipper/amplifier/phase detector, and video-IF amplifier, Decal base; LCF201/5U9 or PCF201/8U9 with a 6.3 V/410 mA heater
ECF202/6AJ9 – Triode + sharp-cutoff pentode used as SECAMchroma signaldemodulators in analog color TV receivers, 380 mA heater, Decal base
ECF801/6GJ7 – VHF Frame-grid triode/pentode oscillator/mixer used in TV tuners, Noval base; LCF801/5GJ7, PCF801/8GJ7 or XCF801/4GJ7 with a 6.3 V/410 mA heater
ECF802/6JW8 – Triode + sharp-cutoff pentode used as reactance and sinewave oscillator in TV receivers, Noval base; LCF802/6LX8, PCF802/9JW8, XCF802/4JW8 or 5JW8 with a 6.3 V/430 mA heater
ECF803 – ECF801/6GJ7 with separate cathodes
ECF804 – Triode + sharp-cutoff pentode used as wideband amplifier, Noval base; PCF804 with a 6.3 V/450 mA heater
ECF805/6GV7 – VHF Frame-grid triode/remote-cutoff pentode oscillator/mixer used in TV tuners, Noval base; PCF805/7GV7 with a 6.3 V/350 mA heater
ECF812 = EdiSwan 6FL2 – Triode + low-power semiremote-cutoff beam tetrode, Noval base;[478] PCF812 (=30FL2) with a 6.3 V/500 mA heater
ECH4 (ST envelope), ECH4N (GT envelope) – Triode/remote-cutoff heptode oscillator/mixer, 350 mA heater; ECH21 with a side-contact 8 base
ECH4G (Heater pins 2,7), ECH4K (Heater pins 1,8) – ECH4 with an Octal base
ECH11 – Triode/remote-cutoff hexode oscillator/mixer, Y8A steel tube base; VCH11 with a 6.3 V/200 mA heater
ECH21 = ECH71 – Triode/remote-cutoff heptode oscillator/mixer, 350 mA heater; ECH4 with a B8G Loctal base; similar to M-OV/GEC X143
ECH33 = ECH3G
ECH34 = ECH4G
ECH35 – Triode/remote-cutoff hexode oscillator/mixer, 200 mA heater, Octal base; similar to M-OV/GEC X147
ECH41 – Triode/remote-cutoff hexode oscillator/mixer, 225 mA heater, Rimlock base
ECH42/6CU7 – Triode/remote-cutoff hexode oscillator/mixer; ECH80/6AN7 with a Rimlock base; UCH42/14K7 with a 6.3 V/230 mA heater
ECH43 – Triode/remote-cutoff hexode oscillator/mixer, Rimlock base; low-microphonics variant of ECH42; UCH43 with a 6.3 V/230 mA heater
ECH80/6AN7 – Triode/remote-cutoff hexode oscillator/mixer, 230 mA heater;[448] ECH42/6CU7 with a Noval base
ECH81/6AJ8 = M-OV/GEC X719 = 6И1П↦6I1P – Triode/remote-cutoff heptode oscillator/mixer, Noval base; XCH81/3AJ8 with a 6.3 V/300 mA heater
ECH83/6DS8 – Low (6.3-25 V) anode voltage, triode/sharp-cutoff heptode oscillator/mixer used in vehicle equipment, 300 mA heater, Noval base
ECH84/6JX8 – Triode/sharp-cutoff heptode, 300 mA heater, Noval base; similar to 6И3П↦6I3P
ECH171 – Gnome Triode/remote-cutoff heptode oscillator/mixer; UCH171 with a 6.3 V/320 mA heater
ECH200/6V9 = 6И4П↦6I4P – Triode + sharp-cutoff heptode used as pulse amplifier and combined, noise-gated sync sep/clipper/amplifier/phase detector, Decal base; PCH200 with a 6.3 V/435 mA heater
ECL11 – AF Triode + 0.6-watts AF power tetrode, 1 A heater, Y8A steel tube base
ECL80/6AB8 – Triode + 3.5-watts AF power pentode, 300 mA heater, Noval base
ECL81 – Triode + 6.5-watts AF power pentode, Noval base; PCL81 with a 6.3 V/600 mA heater
ECL82/6BM8 = 6Ф3П↦6F3P – AF Triode + 7-watts AF power pentode, Noval base; LCL82/11BM8, PCL82/16A8, UCL82/50BM8 or XCL82/8B8 with a 6.3 V/780 mA heater
ECL83 – AF Triode + 5.4-watts AF power pentode, Noval base; PCL83 or UCL83 with a 6.3 V/600 mA heater
ECL84/6DX8 = 6Ф4П↦6F4P – Triode + 4-watts power pentode used as combined sync sep/clipper/amplifier/phase detector, and CRT cathode driver, Noval base; LCL84/10DX8, PCL84/15DQ8 or XCL84/8DX8 with a 6.3 V/720 mA heater
ECL85/6GV8 = 6Ф5П↦6F5P – Triode + 9-watts power pentode used as CRT vertical deflection oscillator+amplifier, Noval base; LCL85/10GV8, PCL85/18GV8 or XCL85/9GV8 with a 6.3 V/900 mA heater
ECL86/6GW8 – AF Triode + 9-watts AF power pentode used for audio amplification in European TV receivers, Noval base; PCL86/14GW8 or XCL86/8GW8 with a 6.3 V/660 mA heater
ECL113 – Triode + 6.5-watts AF power pentode, 600 mA heater, Rimlock base
ECL200 – Triode + 6-watts CRT drive power pentode, Decal base; PCL200 with a 6.3 V/770 mA heater
ECL802 – Triode + 9-watts power pentode with separate cathodes used as CRT vertical deflection oscillator+amplifier, Noval base; PCL802 with a 6.3 V/875 mA heater
ECL805 – ECL802 with an 8-watts pentode anode; PCL805 with a 6.3 V/860 mA heater
ECLL800 – Triode + 6-wattstotal dual shielded power pentode used as 9.2 W (Class-B) or 8.5 W (Class-AB) AF push-pull power amplifiers. The triode shares its control grid with the 1st pentode and acts as a phase inverter for the 2nd pentode, both pentodes share screen and suppressor grids, 600 mA heater, Noval base[480]
ED100 – Long-life power triode used in telephone equipment, 1.7 A heater, O5A European 5-pin base
ED111 – 6 W, 85 MHz power triode, 450 mA heater, Rimlock base
ED500/6ED4 – 25 kV, 1.6 mA, 30 W Color CRT EHT shunt stabilizer triode, Magnoval base with anode on top cap, considerable X-radiation despite the envelope being fabricated from lead glass; PD500/9ED4 with a 6.3 V/350 mA heater
ED501 – 27 kV, 1.6 mA, 40 W Color CRT EHT shunt stabilizer triode, 200 mA heater, Magnoval base with anode on top cap
ED8000 – 17 W Ruggedized, long-life (>10000h) power triode used as series-pass regulator in stabilized DC power supplies, Silicon-free 800 mA heater, Noval base
EE1 = EEP1 = Philips 4696 – Single-ended secondary emission amplifier used as a wideband amplifier and phase inverter, 600 mA heater, side-contact 8 base with control grid on top cap
EE50 – Single-ended secondary emission amplifier used in TV receivers, 300 mA heater, B9G 9-pin Loctal base
EF1 – Sharp-cutoff RF/IF pentode, 400 mA heater, side-contact 8 base with control grid on top cap[447]
EF2 – Remote-cutoff RF/IF pentode, 400 mA heater, side-contact 8 base with control grid on top cap[447]
EF3 – Remote-cutoff RF/IF pentode, 240 mA heater, side-contact 8 base with control grid on top cap[447]
EF5 – Remote-cutoff pentode, 200 mA heater, side-contact 8 base with control grid on top cap
EF6, EF6N, EF6Bif. (Bifilar heater, low hum) – Sharp-cutoff AF pentode, 200 mA heater; EF36 with a side-contact 8 base with control grid on top cap
EF7 – RF/IF Pentode, side-contact 8 base with control grid on top cap;[447]AF7, CF7 or VF7 with a 6.3 V/240 mA heater
EF8 – Selektode, a Shadow-grid remote-cutoff pentode, 200 mA heater; EF38 with a side-contact 8 base with control grid on top cap
EF9 – Remote-cutoff RF/IF/AF pentode, 200 mA heater; EF22/7B7, EF39 or EF41/6CJ5 with a side-contact 8 base with control grid on top cap
EF11 – Remote-cutoff pentode, 200 mA heater, Y8A steel tube base
EF12, EF12K (Low microphonics), EF12spezial – Sharp-cutoff pentode, 200 mA heater, Y8A steel tube base
EF13 – Remote-cutoff pentode, 200 mA heater, Y8A steel tube base
EF14 – Sharp-cutoff pentode, Y8A steel tube base; UF14 and VF14 with a 6.3 V/470 mA heater
EF15 – Remote-cutoff pentode, Y8A steel tube base; UF15 with a 6.3 V/450 mA heater
EF21 – Remote-cutoff pentode, 200 mA heater, both 8- or 9-pin Loctal base[481] – not related to the EF71
EF22/7B7 – Remote-cutoff RF/IF/AF pentode, 200 mA heater; EF9, EF39 and EF41/6CJ5 with a B8G Loctal base
EF27 – Sharp-cutoff AF pentode, 470 mA heater, B8G Loctal base
EF36 – Sharp-cutoff pentode used as a tuned RF amplifier, a (second) detector, or an AF amplifier, 200 mA heater; EF6 with an Octal base with control grid on top cap
EF39 (PF9/6K7-G) – Dual-control, remote-cutoff RF pentode used as an IF amplifier or as a superheterodyne mixer (1st detector), also used in test equipment, 200 mA heater; EF4, EF22/7B7 or EF41/6CJ5 with an Octal base with control grid on top cap
EF40 – Sharp-cutoff AF pentode, 200 mA heater, Rimlock base
EF41/6CJ5 = Cossor 62VP – Remote-cutoff RF/IF pentode, 200 mA heater; EF4, EF22/7B7 or EF39 with a Rimlock base
EF42 – Sharp-cutoff RF pentode, 330 mA heater; EF52 with a Rimlock base
EF43 – Remote-cutoff RF pentode, 330 mA heater, Rimlock base
EF50, EF50N, EF53 – Remote-cutoff pentode used in the IF amplifiers of 1940s TV and radar receivers, 300 mA heater, B9G 9-pin Loctal base
EF51 – Remote-cutoff pentode, 350 mA heater, B8G Loctal base
EF52 – Sharp-cutoff RF pentode, 350 mA heater; EF42 with a B8G Loctal base
EF54 – Sharp-cutoff RF pentode, 300 mA heater, B9G 9-pin Loctal base
EF55 – Sharp-cutoff RF/video pentode, 1 A heater, B9G 9-pin Loctal base
EF59 – RF pentode, 490 mA heater, B9G 9-pin Loctal base
EF70 – Subminiature, dual-control, sharp-cutoff pentode used as a NAND gate in coincidence circuits, suppressor grid internally connected to a separate diode to prevent positive grid voltage, 200 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF71/5899 – Subminiature remote-cutoff pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF72 – Subminiature, shielded, sharp-cutoff RF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF73 – Subminiature, dual-control, sharp-cutoff pentode, 200 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF74 – Subminiature, dual-control, low-microphonics pentode, 200 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF80/6BX6 = M-OV/GEC Z152 – Sharp-cutoff RF/IF/video pentode, Noval base; XF80/3BX6, 12BX6 or UF80/19BX6 with a 6.3 V/300 mA heater
EF81/6BH5 – Remote-cutoff RF/IF/video pentode, 200 mA heater, Noval base
EF83 – Remote-cutoff AF pentode, 200 mA heater, Noval base
EF85/6BY7 = M-OV/GEC W719 – Remote-cutoff wideband RF pentode, Noval base; HF85 or XF85 with a 6.3 V/300 mA heater
EF86/6BK8/6CF8 = M-OV/GEC/GEC Z729 (6267) – Sharp-cutoff AF pentode, also for use in Transitron circuits in TV receivers, Noval base; PF86, UF86 or XF86 with a 6.3 V/200 mA heater
EF89/6DA6 – Remote-cutoff VHF pentode, 200 mA heater, Noval base
EF96/6AG5 = 6Ж3П↦6J3P – 400 MHz Sharp-cutoff VHF pentode, 300 mA heater, Miniature 7-pin base
EF97/6ES6 = 6К8П↦6K8P – Low (6.3-50 V) anode voltage, remote-cutoff RF/IF pentode used in vehicle equipment, 300 mA heater, Miniature 7-pin base
EF98/6ET6 – Low (6.3-50 V) anode voltage, sharp-cutoff pentode used as oscillator or IF/AF amplifier in vehicle equipment, 300 mA heater, Miniature 7-pin base
EF111 – Remote-cutoff pentode, 200 mA heater, Y8A steel tube base
EF112 – Sharp-cutoff pentode, 200 mA heater, Y8A steel tube base
EF172 – Gnome RF/IF/AF Pentode; UF172 with a 6.3 V/320 mA heater
EF174 – Gnome Pentode; UF174 with a 6.3 V/450 mA heater
EF175 – Gnome Remote-cutoff RF/IF pentode; UF175 with a 6.3 V/450 mA heater
EF176 – Gnome VHF Pentode, prototype only
EF177 – Gnome VHF Pentode, prototype only
EF183/6EH7 = 6К13П↦6K13P – Frame-grid, remote-cutoff IF pentode used in TV receivers, Noval base; LF183/YF183/4EH7 or XF183/3EH7 with a 6.3 V/300 mA heater[482]
EF184/6EJ7 = 6Ж51П↦6J51P – Frame-grid, sharp-cutoff IF pentode used in TV receivers, Noval base; LF184/YF184/4EJ7 or XF184/3EJ7 with a 6.3 V/300 mA heater[483]
EF190/6CB6A/6CF6/6676 – Sharp-cutoff RF pentode used in video-IF circuits, 300 mA heater, Miniature 7-pin base
EF410 – RF/IF Pentode, 200 mA heater, Rimlock base
EF730/5636/5916 – Subminiature, dual-control, sharp-cutoff RF/IF pentode used as a gated or gain-controlled amplifier, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base; similar to 5784
EF731 – Subminiature remote-cutoff RF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF732 – Subminiature sharp-cutoff RF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF734 – Subminiature, dual-control, sharp-cutoff RF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF761 – Subminiature remote-cutoff RF/IF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EF762 – Subminiature sharp-cutoff RF/IF pentode, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base; similar to 5840
EF800 – Long-life sharp-cutoff RF/IF pentode, 275 mA heater, Noval base
EF802 – Long-life sharp-cutoff RF/IF pentode, 285 mA heater, Noval base
EF804 – Sharp-cutoff, low-hum, low-microphonics AF pentode, 200 mA heater, Noval base
EF812 – RF/IF Pentode, 300 mA heater, Noval base[484]
EF814 – RF/IF Pentode, 300 mA heater, Noval base[485]
EF816 – Split-anode pentode used as combined sync sep/clipper/amplifier/phase detector, 300 mA heater, Noval base
EF860 – Long-life sharp-cutoff RF pentode used as preamplifier in telecomms wide-area receivers, Noval base; IF860 with a 6.3 V/300 mA heater
EF861 – Wideband pentode, 300 mA heater, Noval base
EFL200/6Y9 – Pentode + 5-watts power pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode driver, Decal base; LFL200/11Y9 or PFL200/17Y9 with a 6.3 V/800 mA heater
EFM1 – Vari-μ AF pentode + top-view, "Magic Eye"-type tuning indicator with beam control rods internally tied to the floating screen grid on a weak pullup resistor so its DC voltage mirrors the gain-control voltage fed to the control grid together with the audio signal to be amplified, 200 mA heater, side-contact 8 base
EFM11 – Vari-μ AF pentode + top-view, "Magic Eye"-type tuning indicator with beam control rods internally tied to the floating screen grid, 200 mA heater, Y8A steel tube base
EH81 – Sharp-cutoff heptode used as FM quadrature demodulator, 300 mA heater, Noval base
EH90/6CS6 – Sharp-cutoff heptode with American grid topology, used as gated amplifier or combined sync sep/clipper in TV receivers, 300 mA heater, Miniature 7-pin base
EH171 – Gnome Sharp-cutoff heptode, prototype only
EH860 – Sharp-cutoff heptode; superseded in 1957 by EH90/6CS6
EH900 – Sharp-cutoff switching heptode with American grid topology, designed for high speed digital computers, 300 mA heater, Miniature 7-pin base
EH900S/5915 = EH960 – Long-life (>10000h), sharp-cutoff switching heptode, designed for high speed digital computers, Silicon-free 300 mA heater, Miniature 7-pin base
E81H – Sharp-cutoff heptode used as FM quadrature demodulator, 300 mA heater, Noval base
EL1 – 5 W Power pentode, 400 mA heater, side-contact 8 base with control grid on top cap[447]
EL2 – 8 W Power pentode, 200 mA heater; EL32 with a side-contact 8 base with control grid on top cap
EL3 (Domed GT envelope), EL3N (ST envelope) – 9 W Power pentode, 900 mA heater; EL11(N) with a side-contact 8 base
EL3NG = EL33 = 6M6-G – EL3N with an Octal base; similar to 6AG6-G
EL5 – 18 W Power pentode; AL5 with a 6.3 V/1.3 A heater; EL35 with a side-contact 8 base
EL6, EL6spezial – 18 W Power pentode, 1.2 A heater; EL12(N) with a side-contact 8 base
EL8 – 5 W Power pentode, 500 mA heater; EL13 with a side-contact 8 base
EL11 (ST envelope), EL11N (GT envelope) – 9 W Power pentode, 900 mA heater; EL3(N) or EL33 with a Y8A steel tube base
EL12, EL12N, EL12spezial – 18 W Power pentode, 1.2 A heater; EL6 with a Y8A steel tube baseThe maximum anode voltage is 250 V; EL12 selected for higher voltages have suffixes /325, /350, /375 and /425
EL13 – Power pentode; EL8 with a Y8A steel tube base
EL20 – 21 W Power pentode, 900 mA heater, B8G Loctal base[487] – not related to the EL70
EL21 – Power pentode, 750 mA heater, B8G Loctal base;[488] related to the UL21/UL71 but not to the EL71/5902
EL22 – Power pentode, 700 mA heater, B8G Loctal base[487]
EL30 – 4.5 W Power pentode, 400 mA heater, Octal base[489]
EL31 – 25 W Power pentode, 1.4 A heater, Octal base, very similar to EL38/6CN6
EL32 – Power pentode; EL2 with an Octal base
EL33 = EL3NG
EL34/6CA7 = 6П27С↦6P27S – 25 W Power pentode, 1.5 A heater, Octal base
EL35 – Power pentode; EL5 with an Octal base
EL36/6CM5 = 6П31С↦6P31S – 10 W AF or CRT horizontal deflection output power pentode; EL12(N) with an Octal base and anode on top cap; XL36/13CM5 with a 6.3 V/1.25 A heater
EL37 – 25 W Power pentode, 1.4 A heater, Octal base; similar to 6L6-G
EL38/6CN6 – 25 W Power pentode used as CRT horizontal deflection amplifier, Octal base with anode on top cap; PL38 with a 6.3 V/1.4 A heater
EL39 – 18 W Power pentode, 1.3 A heater, Octal base with anode on top cap[490]
EL41/6CK5 = M-OV/GEC N150 – 9 W AF Power pentode, 710 mA heater; EL80 with a Rimlock base
EL42 = M-OV/GEC N151 – 6 W Power pentode, 200 mA heater; EL85 with a Rimlock base
EL43 – 9 W Power pentode, 710 mA heater; EL83 with a Rimlock base[491]
EL44 – 5 W Power pentode, Rimlock base; UL44 with a 6.3 V/720 mA heater
EL50 = Philips 4654 – 18 W Power pentode, 1.35 A heater, side-contact 8 base with anode on top cap
EL51 – 45 W Power pentode, 1.9 A heater, side-contact 8 base with anode on top cap
EL53 = EL3/425 – Power pentode, 900 mA heater, side-contact 8 base;[492] EL3 with a 425 V anode
EL54 – Power pentode, 1.2 A heater, side-contact 8 base;[493] EL6 with a 425 V anode
EL60 – Power pentode; EL34/6CA7 with a B9G 9-pin Loctal base
EL61 – Power pentode, 1.35 A heater; EL5/375 with a B9G 9-pin Loctal base
EL70 – Subminiature power pentode, 450 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EL71/5902 – 4 W Subminiature AF power pentode, 450 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EL80/6M5 – 9 W AF power pentode, 710 mA heater; EL41 with a Noval base
EL81/6CJ6 – 8 W Power pentode used as CRT horizontal deflection amplifier or as series-pass regulator in stabilized DC power supplies, 1.05 A heater, Noval base[494]
EL82/6DY5 = 6П18П↦6P18P – 9 W Power pentode used as CRT vertical deflection or AF amplifier, 800 mA heater, Noval base
EL83/6CK6 = 6П15П↦6P15P – 9 W Power pentode used as CRT cathode driver, 710 mA heater, Noval base
EL84/6BQ5 = M-OV/GEC N709 = 6П14П↦6P14P – 12 W AF power pentode, Noval base; XL84/8BQ5, 10BQ5 with a 6.3 V/760 mA heater
EL85/6BN5 – 6 W, 120 MHz RF/AF power pentode used in mobile equipment, 200 mA heater; EL42 with a Noval base
EL86/6CW5 = 6П33П↦6P33P – 12 W Power pentode used as CRT vertical deflection or AF amplifier; EL84/6BQ5 modified for a lower power supply voltage; HL84, LL86/10CW5, PL84/15CW5,[495][496] UL84/45B5 or XL86/8CW5 with a 6.3 V/760 mA heater
EL88 – 8 W AF power pentode, 750 mA heater, Noval base
EL89 – 11 W AF power pentode, 750 mA heater, Noval base
EL90/6AQ5 = M-OV/GEC N727 (6005, 6П1П↦6P1P) – 12 W AF power pentode, 450 mA heater, Miniature 7-pin base
EL91/6AM5 (M8082) – 4 W AF power pentode, 200 mA heater, Miniature 7-pin base
EL95/6DL5 – 6 W AF power pentode, 200 mA heater, Miniature 7-pin base
EL112 – Radiation-cooled VHF/SW/AF power pentode, 800 mA heater; EL152 or EL401 with a Y8A steel tube base
EL136/6FV5 – 16 W Power pentode used as 110° horizontal deflection amplifier in analog color TV receivers, 1.65 A heater, Octal base
EL150 – Power pentode, 1.2 A heater, Y8A steel tube base; EL12 with a 350 V anode
EL151 – 60 W AF Power pentode, 1.9 A heater, Y10A steel tube 10-pin base
EL152 – 40 W, 50 MHz Radiation-cooled VHF/SW/AF power pentode; EL112 or EL401 with a B10V glass 10-pin base with one big pin for the anode; FL152 with a 6.3 V/1.55 A heater
EL153 – 40 W, 100 MHz Radiation-cooled power pentode, 1.55 A heater, B10V glass 10-pin base with one big pin for the anode
EL156 – 50 W AF Power pentode, 1.9 A heater, Y10A steel tube 10-pin base
EL171 – 4 W Gnome AF Power pentode; UL171 with a 6.3 V/900 mA heater
EL172 – 8 W Gnome AF Power pentode, 1.2 A heater
EL173 – Gnome Power pentode for use as CRT horizontal deflection amplifier, prototype only
EL180/12BY7 – Power pentode used as CRT cathode driver, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
EL183 – 6 W Power pentode used as CRT cathode driver, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
EL300/6FN5 – 17.6 W Power pentode used as CRT horizontal deflection amplifier, Octal base with anode on top cap; PL300/35FN5 with a 6.3 V/1.65 A heater
EL360 – 15 W Pulse-rated power pentode used as Radar PPI scanning/deflection amplifier, or as pulse modulator, or as series-pass regulator in stabilized DC power supplies, 1.27 A heater, Octal base with anode on top cap
EL401 – Radiation-cooled VHF/SW/AF power pentode, 1.55 A heater; EL112 or EL152 with a B8G Loctal base
EL500/6GB5 = 6П36С↦6P36S – 17 W Beam power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; LL500/18GB5, PL500/27GB5 or XL500/13GB5 with a 6.3 V/1.38 A heater
EL502 – 20 W Power pentode used as CRT horizontal deflection amplifier, 1.7 A heater, Magnoval base with anode on top cap
EL503/8278, EL506 – 29 W AF power pentode, 1.05 A heater, Magnoval base
EL504 – 16 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; LL504/18GB5A or PL504 or XL504/13GB5A with a 6.3 V/1.38 A heater
EL505/6KG6 – 16 W Power pentode used as CRT horizontal deflection amplifier for analog color TV receivers, Magnoval base with anode on top cap; PL505/40KG6 with a 6.3 V/2 A heater
EL508/6KW6 – 12 W Power pentode used as CRT vertical deflection amplifier for analog color TV receivers, Magnoval base; PL508/17KW6 with a 6.3 V/825 mA heater
EL509/6KG6A – EL505/6KG6 with a 30 W anode; LL509/26KG6A or PL509/40KG6A with a 6.3 V/2 A heater
EL511 – 20 W Power pentode used as CRT horizontal deflection amplifier, 1.3 A heater, Magnoval base with anode on top cap
EL519, EL519R = 6П45С↦6P45S – 35 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; upgraded EL509/6KG6A; PL519 with a 6.3 V/2 A heater
EL520 – EL503 AF beam power tetrode with a 1.2 A heater and a B9E Novar base
EL802/6LD6 – 6 W Power pentode used as CRT cathode drive in analog color TV receivers, Noval base; LL802/10LD6 or PL802 with a 6.3 V/800 mA heater
EL803 – 9 W Wideband power pentode, 650 mA heater, Noval base
EL804 – 10 W Wideband power pentode, 700 mA heater, Noval base with anode on top cap
EL805 – 8 W Power pentode used as CRT vertical deflection amplifier, Noval base; PL805 with a 6.3 V/760 mA heater
EL806 – 10 W Power pentode used as CRT cathode driver, center-tapped 6.3 V/600 mA resp. 12.6 V/300 mA heater, Noval base
EL820 – Power pentode, 1.05 A heater, Noval base with anode on top cap[497]
EL821/6CH6 (6132) – 12 W Power pentode used as CRT cathode driver in high definition television equipment, 750 mA heater, Noval base
EL822 – 12 W Power pentode used as CRT cathode driver, 750 mA heater, Noval base
EL844 – 9 W RF power pentode, 760 mA heater, Noval base
EL861 = E81L/6686 – 4.5 W Long-life RF power pentode used as output amplifier in telecomms wide-area transmitters, Noval base; IL861 with a 6.3 V/230 mA heater
EL862 – Power pentode, 315 mA heater, Noval base
EL863 (EL83/6CK6) – Power pentode, 710 mA heater, Noval base; EL803S with a different pinout
EL803S – Ruggedized, long-life (>10000h), wideband power pentode, Silicon-free 650 mA heater, Noval base
EL3010 – 35 W Ruggedized, long-life (>10000h), linear power pentode, Silicon-free, center-tapped 6.3 V/2.2 A resp. 12.6 V/1.1 A heater, Octal base
EL5000 – AF power pentode, 1.22 A heater, Magnoval base with anode on top cap; upgraded EL500
EL5070/8608 – 10 W Frame-grid power pentode used as wideband video driver, 600 mA heater, Magnoval base
EL8000 – Shadow-grid Beam power pentode, 550 mA heater, Noval base
E55L/8233 – 10 W Ruggedized, long-life (>10000h), wide-band power pentode used as CRT vertical deflection electrode driver in oscilloscopes, 600 mA heater, Magnoval base with Gold-plated pins
E80L/6227E80L – 8 W Ruggedized, long-life (>10000h) AF power pentode, 700 mA heater, Noval base with Gold-plated pins
E81L/6686 – 4.5 W Long-life (>10000h) power pentode used in telephone equipment, 375 mA heater, Noval base with Gold-plated pins (no relationship to EL81)
E84L/7320 – 13.5 W Ruggedized, long-life (>10000h) power pentode used in AF amplifiers and stabilized power supplies, Silicon-free 760 mA heater, Noval base
E130L/7534 – 27.5 W Ruggedized, long-life (>10000h) wideband power pentode, 1.7 A heater, Octal base with anode on top cap
E235L/7751 – 15 W Ruggedized, long-life (>10000h) wideband beam power pentode, Silicon-free 1.2 A heater, Octal base
E236L – 15 W Ruggedized, long-life (>10000h) wideband power pentode, Silicon-free 1.2 A heater, Octal base with anode on top cap
EM34/6CD7 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 200 mA heater; EM4(N) with an Octal base
EM35 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 200 mA heater; EM5 or EM11 with an Octal baseNote: Telefunken EM35s appear to have a different pinout than examples from other manufacturers[500]
EM71 – Top-view, fan-type tuning indicator with an unusual offset cathode,[501] B8G 8-pin Loctal base; HM71 with a 6.3 V/300 mA heater
EM72 – EM71 with two segments of the fluorescent screen uncoated with Phosphor, intended for indicating low and peak levels but not average level, useless for tuning but intended for recording level indication
EM80/6BR5 = 6Е1П↦6Ye1P – Side-view, fan-type tuning indicator, 300 mA heater, Noval base
EM81/6DA5 – EM80/6BR5 with 25% greater sensitivity
EM83 – Side-view, "Magic Balance" band-type dual-channel tuning/level indicator, two DC amplifier triodes and one electron gun for two separate screen anodes, 300 mA heater, Noval base, mainly for stereo use in tape recorders
EM84/6DH7/6FG6 = 6Е3П↦6Ye3P – Side-view, band-type tuning/level indicator, 210 mA heater, Noval base
EM84a – Upgraded EM84 with twice the sensitivity[502]
EM85 – Side-view, fan-type tuning indicator, Noval base; HM85 or UM85 with a 6.3 V/300 mA heater
E82M – Side-view, rectangle-type dual-channel level indicator, two DC amplifier triodes control separate deflection rods before a 17 × 20 mm screen anode, 800 mA heater, Noval base
EN31 – 1 kV, 10 mAavg, 750 mApeak Helium triode thyratron, negative control characteristic, for high-frequency timebases and control equipment, 1.3 A heater, Octal base with anode cap
EN32/6574 – 1.3 kV, 300 mAavg, 2 Apeak, 10 Asurge Gas-filled tetrode thyratron, negative control characteristic, used in industrial control systems, 950 mA heater, Octal base
EN70 (5643) – 500 V, 20 mAavg, 100 mApeak Subminiature, Xenon tetrode thyratron, negative control characteristic, 150 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EN91/2D21 = Philips PL21 = PL2D21 = STC 4G/280K (E91N/2D21-W/5727, CV797) – 650 V, 100 mAavg, 500 mApeak, 10 Asurge Xenon tetrode thyratron used as relay driver or grid-controlled rectifier, negative control characteristic, 600 mA heater, Miniature 7-pin base
EN92/5696 – 500 V, 25 mAavg, 100 mApeak, 2 Asurge Xenon tetrode thyratron used in industrial control systems, negative control characteristic, 150 mA heater, Miniature 7-pin base
ES111 – TV sync oscillator (German: Kipp-Pentode), a special power relaxation oscillator pentode, an attempt to cut costs on TV receiver production; one ES111 each were needed for vertical and horizontal deflection; the output power for the deflection yoke was extracted not from the anode, but from the screen grid, the sync pulses were applied to the suppressor grid via a separate pin. The anode acted only as a small-signal amplified/gated-sync output which was added to the feedback from an auxiliary winding on the deflection yoke, and fed to the control grid. As there was no vertical deflection output transformer, a secondary, magnetically decoupled vertical deflection yoke received a variable, smoothed-out part of the screen grid current to compensate for its DC component in the primary vertical deflection yoke; it was variable to adjust the vertical picture position on the CRT screen. The screen grid delivered enough power even for an EHT winding on the horizontal deflection output transformer and for the 6.3V/0.2A heater of an RFG5 16-kV EHT rectifier.[506][507][508][509] 1 A heater, Y8A steel tube base with 2 unused pins, screen grid on top cap; compare US111
E1T/6370 – Long-life (>10000h) Trochotron with side-viewing, fluorescent-screen readout, 300 mA heater, Duodecal 12-pin base
E80T/6218 – Modulated, single-anode, hexode-type beam deflection tube for pulse generation up to 375 MHz, 150 mA heater, Noval base, shock resistant up to 500 g;[133][132][134][135] similar to CV5724
EY1 – CRT EHT rectifier, half-indirect 90 mA heater; EY51 with a B4B 4-pin subminiature hearing aid base with anode on top cap
EY51/6X2 – 17 kV, 3 mA Half-indirectly heated CRT EHT rectifier, wire-ended version of EY1
EY70 – 850 V, 45 mA Half-wave rectifier, 450 mA heater, all-glass round cross-section envelope, circular 8-pin/wire-ends base
EY80/6U3 – 4 kV, 180 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base; PY80 with a 6.3 V/900 mA heater
EY81/6R3 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base, cathode on top cap; PY81/17Z3 with a 6.3 V/810 mA heater
EY82/6N3 – 850 V, 180 mA Half-wave rectifier, Noval base; PY82/19Y3 with a 6.3 V/900 mA heater
EY83 – 5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base, cathode on top cap; PY83 with a 6.3 V/1 A heater
EY86/6S2, EY806 – 22 kV, 800 µA Half-indirectly heated CRT EHT rectifier, Noval base with anode on top cap; DY86/1S2 or GY86 with a 6.3 V/90 mA heater
EY87/6S2A, EY807 – EY86 variant for operation at high altitudes with a silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions, Noval base; DY87/1S2A with a 6.3 V/90 mA heater
EY88/6AL3 = 6Д20П↦6D20P – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base, cathode on top cap; LY88/20AQ3, PY88/30AE3 or XY88/16AQ3 with a 6.3 V/1.55 A heater
EY91 – 250 V, 75 mA Half-wave rectifier, 420 mA heater, Miniature 7-pin base
EY500/6EC4 – 5.6 kV, 440 mA CRT horizontal deflection output booster/damper/efficiency diode for analog color TV receivers, Magnoval base with cathode on top cap, guardian shield between filament and cathode to improve high voltage properties; PY500/42EC4 with a 6.3 V/2.1 A heater
EY500A/6EC4A – EY500/6EC4 without the guardian shield because of an improved filament/cathode insulation
EY802 – 20 kV, 500 µA Half-indirectly heated CRT EHT rectifier, silicone-coated envelope, Noval base with anode on top cap; DY802/1BQ2 or GY802 with a 6.3 V/120 mA heater
EYY13 – Dual 1.55 kV, 175 mA (each) rectifier with separate cathodes and half-indirect 1.25 A (each) heaters, used as a voltage doubler, Y8A steel tube base
FDD20 – Common cathode dual power triode, 12.6 V/350 mA heater, side-contact 8 base - available with two different pinouts;[511] similar to 53, 6A6, 6N7-G
GY11 – 2 kV, 100 mA Half-wave rectifier, half-indirect 2.5 V/5 A heater, Y8A steel tube base with anode on top cap
GY86 – Half-indirectly heated CRT EHT rectifier, Noval base with anode on top cap; DY86/1S2 or EY86/6S2 with a 2.6 V/300 mA heater
GY501/3BH2 = 3Ц2С↦3C2S – 35 kV, 1.7 mA CRT EHT rectifier for analog color TV receivers, half-indirect 3.15 V/400 mA heater, Magnoval base with anode on top cap
GY802 – Half-indirectly heated CRT EHT rectifier, silicone-coated envelope to prevent flush-over in high-humidity and low atmospheric-pressure conditions, Noval base with anode on top cap; DY802/1BQ2 or EY802 with a 2.6 V/310 mA heater
HABC80 – Triple diode + high-μ triode on common cathode with two of the diodes used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war AM/FM radios, triode μ = 70, Noval base; 19T8 with a longer glass envelope; EABC80/6AK8, PABC80/9AK8 or UABC80/27AK8 with a 19 V/150 mA heater
KA561 – Gas-filled, directly heated noise diode for the 7.5 cm band, waveguide output, 3.2 A filament, B15d lamp base with anode on top cap; similar to 6356
KA562 – Gas-filled, directly heated noise diode for the 3 cm band, waveguide output, 2 A filament, B15d lamp base with anode on top cap; similar to 6358
KA563 – Gas-filled, directly heated noise diode for the 1.25 cm band, waveguide output, 1.9 A filament, B15d lamp base with anode on top cap; similar to 6359
K50A – Neon-filled, directly heated noise diode for the 3 cm band, waveguide output, 2 A filament, B15d lamp base with anode on top cap; similar to 6358
K51A – Neon-filled, directly heated noise diode for the 10 cm band, waveguide output, 3.5 A filament, B15d lamp base with anode on top cap
KB1 – Directly heated dual diode with common cathode, 70 mA filament, poor performance as an AM detector lead to the introduction of type KB2; see introduction
KB2 – Indirectly heated dual diode with common cathode, 95 mA heater, side-contact 5 base
KE50 – Tetrode used in hearing aids, 60 mA filament, B4B 4-pin subminiature base with anode on top cap;[515] similar to DF51, M-OV/GEC S12, Mullard DAS1
LCF80/6LN8 – VHF Triode/pentode oscillator/mixer; ECF80/6BL8, PCF80/9A8, UCF80 or XCF80/4BL8 with a 6 V/450 mA heater[518]
LCF86/5HG8 – VHF Frame-grid, medium-μ triode/sharp-cutoff pentode oscillator/mixer; ECF86/6HG8, PCF86/7HG8, 8HG8 or XCF86/4HG8 with a 5.3 V/450 mA heater[519]
LCF200/5X9 – Triode + pentode used as IF amplifier in TV receivers, Decal base; ECF200/6X9 or PCF200/8X9 with a 5.9 V/450 mA heater
LCF201/5U9 – Triode + pentode used as combined sync sep/clipper/amplifier/phase detector, and IF amplifier, Decal base; ECF201/6U9 or PCF201/8U9 with a 5.9 V/450 mA heater[520]
LCF801/5GJ7 – VHF Frame-grid triode/pentode oscillator/mixer used in TV tuners, Noval base; ECF801/6GJ7, PCF801/8GJ7 or XCF801/4GJ7 with a 5.6 V/450 mA heater[521]
LCF802/6LX8 – Medium-μ triode + sharp-cutoff pentode used as reactance and sinewave oscillator in TV receivers, Noval base; ECF802/6JW8, PCF802/9JW8, XCF802/4JW8 or 5JW8 with a 6 V/450 mA heater[522]
LCL82/11BM8 – AF triode + AF power pentode; ECL82/6BM8, PCL82/16A8, UCL82/50BM8 or XCL82/8B8 with a 10.7 V/450 mA heater
LCL84/10DX8 – Triode + power pentode used as combined sync sep/clipper/amplifier/phase detector, and CRT cathode driver; ECL84/6DX8, PCL84/15DQ8 or XCL84/8DX8 with a 10.2 V/450 mA heater[523]
LCL85/10GV8 – Triode + power pentode used as CRT vertical deflection oscillator+amplifier; ECL85/6GV8, PCL85/18GV8 or XCL85/9GV8 with an 11.6 V/450 mA heater[524]
LFL200/11Y9 – Pentode + power pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode driver, Decal base; EFL200/6Y9 or PFL200/17Y9 with an 11 V/450 mA heater[527]
LL86/10CW5 – Power pentode used as CRT vertical deflection or AF amplifier; EL86/6CW5, HL84, PL84/15CW5[496], UL84/45B5 or XL86/8CW5 with a 10.6 V/450 mA heater
LL500/18GB5 – Beam power pentode used as CRT horizontal deflection amplifier, Magnoval base; EL500/6GB5, PL500/27GB5 or XL500/13GB5 with an 18 V/450 mA heater[528]
LL504/18GB5A – Power pentode used as CRT horizontal deflection amplifier, Magnoval base; EL504 or PL504 or XL504/13GB5A with a 19 V/450 mA heater
LL509/26KG6A – EL509/6KG6A or PL509/40KG6A with a 28 V/450 mA heater
LL521/21KQ6 – Power pentode used as CRT horizontal deflection amplifier, Magnoval base; PL521/29KQ6 with a 21.5 V/450 mA heater
LL802/10LD6 – Power pentode used as CRT cathode drive in analog color TV receivers, Noval base; EL802/6LD6 or PL802 with a 10.5 V/450 mA heater
Note: Gas-filled cold-cathode tubes were shifted to Z before their mass production in Europe started, but before that, most producers published RETMA 0-prefix tube data appearantly under this letter: OA2, OA3, OB2, OB3, OC2, OC3, OD3, etc.
OC47 – 20 V, 100 mA Germanium PNP transistor, β ≈ 50...200Note: The German Clevite-Intermetall sold their first lineup of silicon PNP transistors initially under these same type numbers OC43...47; when this became clear, they appended a 0 to their type numbers, henceforth selling this line as OC430...470[541]
ORP80/RPY13 – Vactrol-type opto-isolator, a small 24 V/60 mA incandescent lamp surrounded by four 200 VmaxCdS photoresistors in a black-tinted glass envelope, Noval base[542]
Philips sold a 300mA series heater product line under this letter in South America: PAB1, PBC3/6SQ7-GT, PBF2/6B8-G, PF9/6K7-G, PH4/6A8-G and PM5, used in combination with RETMA types 25L6 and 25Z6[34]
PABC80/9AK8 – Triple diode + high-μ triode on common cathode with two of the diodes, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war European AM/FM radios and TV receivers, triode μ = 70, Noval base; EABC80/6AK8, HABC80 or UABC80/27AK8 with a 9.5 V/300 mA heater
PCF200/8X9 – Triode + pentode used as IF amplifier in TV receivers, Decal base; ECF200/6X9 or LCF200/5X9 with a 8.5 V/300 mA heater
PCF201/8U9 – Triode + pentode used as combined sync sep/clipper/amplifier/phase detector, and IF amplifier, Decal base; ECF201/6U9 or LCF201/5U9 with a 8.5 V/300 mA heater
PCF800 – VHF Frame-grid triode/pentode oscillator/mixer, 9 V heater, Noval base; similar to EdiSwan 30C15
PCF801/8GJ7 – VHF Frame-grid triode/pentode oscillator/mixer used in TV tuners, Noval base; ECF801/6GJ7, LCF801/5GJ7 or XCF801/4GJ7 with a 8.5 V/300 mA heater
PCF802/9JW8 – Triode + pentode used as reactance and sinewave oscillator in TV receivers, Noval base; ECF802/6JW8, LCF802/6LX8, XCF802/4JW8 or 5JW8 with a 9 V/300 mA heater
PCF803 – PCF801/8GJ7 with separate cathodes
PCF805/7GV7 – VHF Frame-grid triode/remote-cutoff pentode oscillator/mixer used in TV tuners, Noval base; ECF805/6GV7 with a 7.4 V/300 mA heater
PCF806 – VHF Frame-grid triode/sharp-cutoff pentode oscillator/mixer, 8 V heater, Noval base
PCF808 – Triode + pentode used as RF amplifier and CRT deflection oscillator in TV receivers, 7.4 V heater, Noval base[47]
PCF810 – Triode + pentode, Noval base
PCF812 = EdiSwan 30FL2 – Triode + low-power semiremote-cutoff beam tetrode, Noval base;[478] ECF812 (=6FL2) with a 10.4 V/300 mA heater
PCH200/9V9 – Triode + sharp-cutoff heptode used as pulse amplifier and combined, noise-gated sync sep/clipper/amplifier/phase detector, Decal base; ECH200/6V9 with a 8.5 V/300 mA heater
PCL82/16A8 = 16Ф3П↦16F3P – AF triode + AF power pentode, Noval base; ECL82/6BM8, LCL82/11BM8, UCL82/50BM8 or XCL82/8B8 with a 16 V/300 mA heater
PCL83 – Triode + power pentode, Noval base; ECL83 or UCL83 with a 12.6 V/300 mA heater
PCL84/15DQ8 = 15Ф4П↦15F4P – Triode + power pentode used as combined sync sep/clipper/amplifier/phase detector, and CRT cathode driver, Noval base; ECL84/6DX8 or LCL84/10DX8 or XCL84/8DX8 with a 15 V/300 mA heater
PCL85/18GV8 = 18Ф5П↦18F5P – Triode + power pentode used as CRT vertical deflection oscillator+amplifier, Noval base; ECL85/6GV8, LCL85/10GV8 or XCL85/9GV8 with a 17.5 V/300 mA heater
PCL86/14GW8 – AF Triode + AF power pentode used for audio amplification in European TV receivers, Noval base; ECL86/6GW8 or XCL86/8GW8 with a 13.3 V/300 mA heater
PCL88 = EdiSwan 30PL14 – Triode + 8-watts power pentode used as CRT vertical deflection oscillator+amplifier in B/W TV receivers with 110° or 114° deflection, 16 V heater, Noval base[544]
PCL200 – Triode + CRT drive power pentode, Decal base; ECL200 with a 15.5 V/300 mA heater
PCL501 – Triode + power pentode, 27 V heater, Magnoval base
PCL800/16GK8 = EdiSwan 30PL13 – Triode + 7-watts beam power tetrode, 16 V heater, Noval base[545]
PCL802 – ECL802 Triode + power pentode with a 17.5 V/300 mA heater
PCL805 – ECL805 Triode + power pentode with a 17.5 V/300 mA heater
PD500/9ED4 – 25 kV Color CRT EHT shunt stabilizer triode, Magnoval base, considerable X-radiation despite the envelope being fabricated from lead glass; may be replaced by the PD510 after rewiring the arc-safety shield pin of the socket; ED500/6ED4 with a 7.3 V/300 mA heater
PD510 – PD500 with a higher PbO content in the glass, improving the X-radiation screening,[85] and therefore should never be replaced by a PD500 in equipment designed for the PD510[546]
PF9/6K7-G – Dual-control, remote-cutoff RF pentode, 6.3 V heater, Octal base with control grid on top cap
PF83 – Remote-cutoff AF pentode used as a VCA in remotely controllable TV receivers, 4.5 V heater, Noval base
PF86 – Sharp-cutoff AF pentode, also for use in Transitron circuits in TV receivers, Noval base; EF86/6BK8/6CF8, UF86 or XF86 with a 4.5 V/300 mA heater
PFL200/17Y9 – Pentode + 5-watts power pentode used as audio-IF amplifier or combined sync sep/clipper/amplifier/phase detector or gated AGC amplifier/keyer/noise inverter, and CRT cathode driver, Decal base; EFL200/6Y9 or LFL200/11Y9 with a 17 V/300 mA heater
PL11 – Power pentode, Y8A steel tube base; UL11 with a 17.5 V/300 mA heater
PL33 – 9 W Power pentode used as CRT vertical deflection or AF amplifier, 19 V heater, Octal base
PL36/25E5 – 11 W Power pentode used as CRT horizontal deflection amplifier in TV receivers up to c. 1964, 25 V heater, Octal base with anode on top cap. Last consumer electronics use in DECCA series DR101, 202, 303, 404, 505, 606 monochrome receivers
PL38 – 25 W Power pentode used as CRT horizontal deflection amplifier, Octal base with anode on top cap; EL38/6CN6 with a 30 V/300 mA heater
PL38M – PL38 with a metal particles spray-shielded envelope on a separate pin[547]
PL81/21A6, PL81F – 7.5 W Power pentode used as CRT horizontal deflection amplifier, 21.5 V heater, Noval base with anode on top cap
PL81A – Similar to PL81 but optimized for portable television designs
PL82/16A5 – 9 W Power pentode used as CRT vertical deflection or AF amplifier, 16.5 V heater, Noval base
PL83/15A6 = M-OV/GEC N309 – 9 W Power pentode used as CRT cathode driver, 15 V heater, Noval base
PL84/15CW5 – 12 W Power pentode used as CRT vertical deflection or AF amplifier, Noval base; EL86/6CW5,[495][496] HL84, LL86/10CW5, UL84/45B5 or XL86/8CW5 with a 15 V/300 mA heater
PL95 – 6 W AF power pentode, 4.5 V heater, Miniature 7-pin base
PL136/35FV5 – 16 W Power pentode used as 110° horizontal deflection amplifier in analog color TV receivers, 35 V heater, Octal base
PL300/35FN5 – 17.6 W Power pentode used as CRT horizontal deflection amplifier, Octal base; EL300/6FN5 with a 35 V/300 mA heater
PL302 – 11 W Beam power pentode used as CRT horizontal deflection amplifier, 25 V heater, Octal base
PL500/27GB5/28GB5 – 17 W Beam power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; EL500/6GB5, LL500/18GB5 or XL500/13GB5 with a 27 V/300 mA heater
PL502 – 20 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; EL502 with a 35 V/300 mA heater
PL504 – 16 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; upgraded drop-in replacement for PL500; EL504 or LL504/18GB5A or XL504/13GB5A with a 27 V/300 mA heater
PL505/40KG6 – 16 W Power pentode used as CRT horizontal deflection amplifier for analog color TV receivers, Magnoval base with anode on top cap; EL505/6KG6 with a 40 V/300 mA heater
PL508/17KW6 – 12 W Power pentode used as CRT vertical deflection amplifier for analog color TV receivers, Magnoval base; EL508/6KW6 with a 17 V/300 mA heater
PL509/40KG6A – PL505/40KG6 with a 30 W anode; EL509/6KG6A or LL509/26KG6A with a 40 V/300 mA heater
PL511 – 20 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; EL511 with a 27 V/300 mA heater
PL519 – 35 W Power pentode used as CRT horizontal deflection amplifier, Magnoval base with anode on top cap; EL519 with a 40 V/300 mA heater
PL521/29KQ6 – Power pentode used as CRT horizontal deflection amplifier, Magnoval base; LL521/21KQ6 with a 29 V/300 mA heater
PL802 – 6 W Power pentode used as CRT cathode driver in analog color TV receivers, Noval base; EL802/6LD6 or LL802/10LD6 with a 16 V/300 mA heater
PL805 – 8 W Power pentode used as CRT vertical deflection amplifier, Noval base; EL805 with a 15 V/300 mA heater
PL820 – Power pentode used as CRT horizontal deflection amplifier, 15 V heater, Noval base with anode on top cap[547]
PL841 – Power pentode used as CRT vertical deflection or AF amplifier, 16 V heater, Noval base
PY31 – 1 kV, 125 mA Half-wave rectifier, 17 V heater, Octal base
PY32 – 700 V, 325 mA Half-wave rectifier, 29 V heater, Octal base
PY33 – 700 V, 325 mA Half-wave rectifier, 29 V heater, Octal base
PY71 – Half-wave rectifier, 21.5 V heater, B8G Loctal base
PY80/19X3 – CRT horizontal deflection output booster/damper/efficiency diode, Noval base; EY80 with a 19 V/300 mA heater
PY81/17Z3 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap; EY81/6R3 with a 17 V/300 mA heater
PY82/19Y3 – 700 V, 180 mA Half-wave rectifier, Noval base; EY82/6N3 with a 19 V/300 mA heater
PY83 – 5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap; EY83 with a 20 V/300 mA heater
PY88/30AE3 – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap; EY88/6AL3, LY88/20AQ3 or XY88/16AQ3 with a 30 V/300 mA heater
PY500/42EC4 – 5.6 kV, 440 mA CRT horizontal deflection output booster/damper/efficiency diode for analog color TV receivers, Magnoval base with cathode on top cap, guardian shield between filament and cathode to improve high voltage properties; EY500/6EC4 with a 42 V/300 mA heater
PY500A/42EC4A – PY500/42EC4 without the guardian shield because of an improved filament/cathode insulation
PY800 – 5.75 kV, 175 mA CRT horizontal deflection output booster/damper/efficiency diode, 19 V heater, Noval base with cathode on top cap
PY801 – 5.5 kV, 175 mA CRT horizontal deflection output booster/damper/efficiency diode, 19 V heater, Noval base with cathode on top cap[548]
PZ30 – Dual 200 mA rectifier with separate cathodes used as a voltage doubler in TV receivers, center-tapped 300 mA/52 V resp. 600 mA/26 V heater, Octal base
TY86F – 7.4 V/77 mA heater version of type EY86 18-kV CRTEHT rectifier,[547] for use as a hotfix in early-production Ferguson Radio Corporation TV receivers 306T and 308T[559] where the horizontal-output transformer produced excessive heater voltage which destroyed the originally fitted EY86's
U30 – Barretter with a 70 to 122.5 V filament, used to adapt standard 116-volts Rimlock tube sets such as UCH42+UF41+UBC41+UL41+UY41 or UCH42+2×UAF42+UL41+UY41 to 220V mains, Octal base because the power dissipation is too high for Rimlock
UABC80/27AK8 – Triple diode + high-μ triode on common cathode with two of the diodes, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war European AM/FM radios, triode μ = 70, Noval base; EABC80/6AK8, HABC80 or PABC80/9AK8 with a 28 V/100 mA heater
UM4 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 12.6 V heater, Octal base; UM34 with a different pinout
UM11 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, Y8A steel tube base; EM11 with a 15 V/100 mA heater
UM34 – UM4 with a different pinout; HM34 with a 12.6 V/100 mA heater
UM35 = EdiSwan 10M2 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, 12.6 V heater, Octal base
UM80/19BR5 – Side-view, fan-type tuning indicator for AM receivers, 19 V heater, Noval base
UM81 – Side-view, fan-type tuning indicator, 19 V heater, Noval base
UM83 – Side-view, "Magic Balance" band-type dual-channel tuning/level indicator, two DC amplifier triodes and one electron gun for two separate screen anodes, Noval base; EM83 with a 20 V/100 mA heater
UM84/12FG6 – Side-view, band-type tuning/level indicator, Noval base; PM84 with a 12 V/100 mA heater
UM85 – Side-view, fan-type tuning indicator, Noval base; EM85 or HM85 with a 19 V/100 mA heater
UM171 – Gnome Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator;[561] EM171 with a 15 V/100 mA heater
US111 – TV sync oscillator, a special relaxation oscillator pentode with the suppressor grid on a separate pin to act as a second control grid, 65 V heater, Y8A steel tube base with 2 unused pins, screen grid on top cap; see ES111
XCF80/4BL8 – VHF Triode/pentode oscillator/mixer; ECF80/6BL8, PCF80/9A8, LCF80/6LN8 or UCF80 with a 4.6 V/600 mA heater
XCF82/5U8 – Triode + pentode; ECF82/6U8 or PCF82/9U8A with a 4.7 V/600 mA heater
XCF801/4GJ7 – VHF Frame-grid triode/pentode oscillator/mixer used in TV tuners, Noval base; ECF801/6GJ7, LCF801/5GJ7 or PCF801/8GJ7 with a 4.1 V/600 mA heater
XCF802/4JW8 – Triode + pentode used as reactance and sinewave oscillator in TV receivers, Noval base; ECF802/6JW8, LCF802/6LX8, PCF802/9JW8 or 5JW8 with a 4.3 V/600 mA heater
XCL82/8B8 – AF triode + AF power pentode; ECL82/6BM8, LCL82/11BM8, PCL82/16A8 or UCL82/50BM8 with a 8.2 V/600 mA heater
XCL84/8DX8 – Triode + power pentode used as sync sep/clipper/amplifier/phase detector, and CRT cathode driver; ECL84/6DX8, LCL84/10DX8 or PCL84/15DQ8 with a 7.8 V/600 mA heater
XCL85/9GV8 – Triode + power pentode used as CRT vertical deflection oscillator+amplifier; ECL85/6GV8, LCL85/10GV8 or PCL85/18GV8 with a 9 V/600 mA heater
XCL86/8GW8 – AF Triode + AF power pentode used for audio amplification in European TV receivers; ECL86/6GW8 or PCL86/14GW8 with a 7 V/600 mA heater
XL36/13CM5 – Power pentode used as CRT horizontal deflection amplifier; EL36/6CM5 with a 12.8 V/600 mA heater
XL84/8BQ5 – Power pentode; EL84/6BQ5, 10BQ5 with a 8.5 V/600 mA heater
XL86/8CW5 – Power pentode used as CRT vertical deflection or AF amplifier; EL86/6CW5, HL84, LL86/10CW5, PL84/15CW5[496] or UL84/45B5 with a 8 V/600 mA heater
XL500/13GB5 – Beam power pentode used as CRT horizontal deflection amplifier, Magnoval base; EL500/6GB5, LL500/18GB5 or PL500/27GB5 with a 13.3 V/600 mA heater
XL504/13GB5A – Power pentode used as CRT horizontal deflection amplifier, Magnoval base; EL504 or LL504/18GB5A or PL504 with a 13.5 V/600 mA heater
Z302C – Unusual decade Counter Dekatron, a counterclockwise-only decade counter tube with separate odd and even extinguishing electrodes except "0", which is tied to a -300V supply so reaching the terminal count produces a negative spike on the anode voltage which can be used to advance the next counter stage with no intermediate active components
Z862E – Noble gas-filled, cold-cathode electrometer tube, control current 10 pA, silicone-coated envelope for isolation, guard ring, envelope inside radioactively coated for a constant ignition voltage
ZM11 – Neon-filled, top-viewing digital indicator tube used in industrial control panels, 21 mm character height, showing a cross with a central dot and independent prongs, Noval base[564]
ZM12 – Neon-filled, top-viewing digital indicator tube used in industrial control panels, 21 mmCH, showing a five-pronged star with a central dot
ZM13, ZM13U (gapped circle) – Neon-filled, top-viewing digital indicator tube used in industrial control panels, 21 mmCH, showing a vertical line and a circle
ZM14 – Neon-filled, top-viewing digital indicator tube used in industrial control panels, 21 mmCH, showing a circle, a triangle and a three-pronged star
Z510M = 6770 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, top-viewing digital indicator tube, 15.5 mmCH, no decimal point
Z562S – Neon-filled, 4 kHz max. decade Counter/Selector Dekatron, envelope inside radioactively coated for a constant ignition voltage
Z564S – 25 kHz max. Decade Counter/Selector Dekatron, envelope inside radioactively coated for a constant ignition voltage
Z572S – Neon-filled, 5 kHz max. decade Counter/Selector Dekatron, aux anodes to directly drive Nixie tubes, envelope inside radioactively coated for a constant ignition voltage
Z0.7/10U – 700 V, 500 mAavg, 10 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a keep-alive/primer anode, positive starter voltage[449]
Z0.7/100U – 700 V, 2 Aavg, 100 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode used to trigger Ignitrons, one starter and a keep-alive/primer anode, positive starter voltage[449]
Z1/100U – 1 kV, 2 Aavg, 100 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode used in welding power supplies, one starter and a keep-alive/primer anode, positive starter voltage[449]
Z70U = 7710 – Subminiature, 3 mAavg, 12 mApeak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a keep-alive/primer cathode, positive starter voltage, all-glass with 4 wire-ends
Z71U = 7711 – Subminiature, 7 mAavg, 12 mApeak, Gas-filled, cold-cathode DC trigger tetrode, two starters, positive starter voltage, all-glass with 4 wire-ends, low impedance at audio frequencies for use in a telephone exchange
Z700U – Subminiature, 4 mAavg, 16 mApeak, Gas-filled, cold-cathode DC trigger tetrode used in Dekatron circuits up to 2...5 kHz, one starter and a keep-alive/primer cathode, positive starter voltage, all-glass wire-ended
Z800U – 2.5 mAavg, 10 mApeak, Gas-filled, cold-cathode DC trigger tetrode used for voltage control, sensitive relay circuits and timers, one starter and a keep-alive/primer cathode, positive starter voltage, Noval base
Z801U – 2.5 mAavg, 10 mApeak, Gas-filled, cold-cathode DC trigger tetrode used with Geiger-Müller tubes, one starter and a keep-alive/primer cathode, negative control characteristic, Noval base
Z803U = 6779 (ZC1020) – 25 mAavg, 100 mApeak, Gas-filled, cold-cathode DC trigger tetrode for voltage control, sensitive relay circuits and timers, one starter and a keep-alive/primer anode, positive starter voltage, Noval base
Z804U = 7713 – 5 mAavg, 25 mApeak, Gas-filled, cold-cathode AC trigger tetrode, one starter and a keep-alive/primer envelope coating, negative control characteristic, Noval base, direct operation from a 200...250VAC mains grid but should be triggered only while UA > 0
Z805U = 7714 – 5 mAavg, 25 mApeak, Gas-filled, cold-cathode AC trigger tetrode, for relay drivers, timers, photoelectric controls, etc., direct operation from a 200...250VAC mains grid, one starter, separate cathode and anode shields/keep-alive/primers on individual pins, positive starter voltage, Noval base
Z70W = 7709 – 4 mA, Gas-filled, cold-cathode DC trigger pentode used in bidirectional counters, two starters and a keep-alive/primer cathode, positive starter voltage, all-glass with 5 wire-ends
Z660W (Cerberus GR43) – 12 mAavg, 50 mApeak, Gas-filled, cold-cathode DC trigger pentode used in bidirectional counters, two starters and a keep-alive/primer anode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage
Z661W (ZC1010) – 8 mAavg, 50 mApeak, Gas-filled, cold-cathode AC trigger pentode used in bidirectional counters, two starters and a keep-alive/primer anode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage
Z700W – 4 mA, Gas-filled, cold-cathode DC trigger pentode used in bidirectional counters, two starters and a keep-alive/primer cathode, positive starter voltage, all-glass with 5 wire-ends
Z806W – Gas-filled, cold-cathode trigger tetrode used in elevator controls, one starter and dual keep-alive/primer, Noval base
Z865W – 25 mAavg, 200 mApeak Gas-filled, cold-cathode AC/DC trigger tetrode used as a relay driver, one starter and a keep-alive/primer cathode, envelope inside radioactively coated for a constant ignition voltage, low positive starter voltage for transistorized circuits, Noval base
Z860X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode DC trigger pentode used in counters, two starters, a keep-alive/primer anode and an internal shield, positive starter voltage, envelope inside radioactively coated for a constant ignition voltage, Noval base
Z861X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode AC trigger pentode, two starters, a keep-alive/primer anode and an internal shield, positive starter voltage, envelope inside radioactively coated for a constant ignition voltage, Noval base
Z863X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode DC trigger pentode used in counters, two starters, a keep-alive/primer anode and an internal shield, negative control characteristic, envelope inside radioactively coated for a constant ignition voltage, Noval base
XP1010 – 10-stage, head-on, S11 photomultiplier for r-ray and gamma ray scintillation spectrometry, selected 150AVP for low noise and resolution, Cs-Sb cathode, Ag-Mg-O-Cs dynodes, Duodecal 12-pin base
XP1120 – 17-stage, windowless photomultiplier for X-ray (λ > 200 pm) or UV (λ < 150 nm) photon counting in a high-vacuum environment up to 10−5mmHg (1.3 mPa), Nickel cathode, Cu-Be-O dynodes, coaxial outputs, built-in resistor ladder
XP1121 – 17-stage, windowless photomultiplier for ion (> 10 keV) or electron (0.1...10 keV) photon counting in a high-vacuum environment up to 10−5 mmHg, Cu-Be-O cathode and dynodes, coaxial outputs, built-in resistor ladder
XP1122 – 17-stage, windowless photomultiplier for X-ray (λ > 200 pm) or UV (λ < 150 nm) photon counting in a high-vacuum environment up to 10−5 mmHg, Nickel cathode, Cu-Be-O dynodes, coaxial outputs, built-in resistor ladder
XP1123 – 17-stage, windowless photomultiplier for ion (> 10 keV) or electron (0.1...10 keV) photon counting in a high-vacuum environment up to 10−5 mmHg, Cu-Be-O cathode and dynodes, coaxial outputs, built-in resistor ladder
XP1130 – 17-stage, windowless photomultiplier for X-ray (λ > 200 pm) or UV (λ < 150 nm) photon counting in a high-vacuum environment up to 10−5 mmHg, Nickel cathode, Cu-Be-O dynodes, coaxial outputs, built-in resistor ladder
XP1131 – 17-stage, windowless photomultiplier for ion (> 10 keV) or electron (0.1...10 keV) photon counting in a high-vacuum environment up to 10−5 mmHg, Cu-Be-O cathode and dynodes, coaxial outputs, built-in resistor ladder
XQ1270 (≥400 TV lines), XQ1271 (≥550 TV lines), XQ1272 (≥500 TV lines) – 2⁄3 in (17 mm), S18 Commercial-grade Vidicon, overall length 10.8 cm (4+1⁄4 in)
XQ1274 – 2⁄3 in (17 mm) Newvicon used in low-light security cameras, magnetic focussing and deflection, ZnSe + CdZnTe target, resolution ≥650 TV lines
XQ1275 – 2⁄3 in (17 mm) Newvicon Camera tube
XQ1276 – XQ1274 with extended red response
XQ1277 – XQ1275 with extended red response
XQ1278 – XQ1275 with better geometry and uniform signal
XQ1285 – 1 in (25 mm), S18 Vidicon used in medical equipment, magnetic focusing and deflection, precision electron gun, fiber optic interface to X-ray image intensifiers with P11 or P20 Phosphors and fiber optic output
XQ1290 – 1 in (25 mm) Resistron S18 Camera tube used with X-ray image intensifiers in medical equipment
XQ1380 – XQ1274 with radiation resistant (anti-browning) faceplate
XQ1381 – 2⁄3 in (17 mm) Newvicon, electrostatioc focusing and magnetic deflection with radiation-resistant (anti-browning) faceplate
XQ1395 – High-resolution Resistron camera tube
XQ1410/L/B/G/R, XQ1413R (extended red response), XQ1415L/R (extended red response and IR filter) – XQ1020 with fiber optics and ≥650 TV lines resolution
XQ1412 – 30mm Plumbicon, low lag, unity gamma matched to X-ray image intensifiers with P20 Phosphor
XQ1427/B/G/R (Color TV broadcast-grade), XQ1428 (industrial-grade) – 2⁄3 in (17 mm) Plumbicon, low lag
XQ1430B/G/R, XQ1435B/G/R – Color TV broadcast-grade Plumbicon
XQ1440, XQ1442, XQ1443, XQ1445 – 1 in (25 mm) Newvicon, separate mesh, ZnSe + CdZnTe target
XQ1500/L/B/G/R, XQ1503R (extended red response), XQ1505R (extended red response and IR filter) – 1 in (25 mm) Color TV broadcast-grade Plumbicon
XQ1560, XQ1565 – 1 in (25 mm) Saticon Camera tube
XQ1570/L/B/G/R (Color TV broadcast-grade), XQ1571 (industrial-grade), XQ1573R (extended red response), XQ1574 (industrial-grade), XQ1575R (extended red response and IR filter), XQ1576 (industrial-grade) – 1 in (25 mm) Plumbicon
XQ1585 – 1 in (25 mm) Saticon Camera tube
XQ1600 – 1⁄2 in (13 mm) Commercial-grade Vidicon, separate mesh, electrostatic focusing and magnetic deflection
XQ1601, XQ1602 (radiation-resistant) – 1⁄2 in (13 mm) Newvicon, separate mesh, electrostatic focusing and magnetic deflection
XQ2070/L/B/G/R (Color TV broadcast-grade), XQ2071 (industrial-grade), XQ2073R (extended red response), XQ2074 (industrial-grade), XQ2075R (extended red response and IR filter), XQ2076 (industrial-grade) – 1 in (25 mm) Plumbicon
XQ2172/X – 1 in (25 mm) Plumbicon used in digital radiography applications, wide dynamic range matched to X-ray image intensifiers with P20 Phosphor
XQ2182 – 1 in (25 mm) Plumbicon, wide dynamic range matched to digital radiography applications
XQ2427/B/G/R (Color TV broadcast-grade), XQ2428 (industrial-grade) – 2⁄3 in (17 mm) Plumbicon
XQ3070/L/B/G/R (Color TV broadcast-grade), XQ3071 (industrial-grade), XQ3073R (extended red response), XQ3074 (industrial-grade), XQ3075R (extended red response and IR filter), XQ3076 (industrial-grade) – 1 in (25 mm) Plumbicon
XQ3427/B/G/R – 2⁄3 in (17 mm) Color TV broadcast-grade Plumbicon
XQ3430B/G/R, XQ3435B/G/R – Color TV broadcast-grade Plumbicon
XQ3440/L/B/G/R, XQ3443R (extended red response), XQ3445R (extended red response and IR filter) – 30mm Color TV broadcast-grade Plumbicon
XQ3457/B/G/R, – XQ3467/B/G/R – 2⁄3 in (17 mm) Color TV broadcast-grade Plumbicon
XQ3477B/G/R, XQ3487B/G/R – Color TV broadcast-grade Plumbicon
XQ3550B/G/R, XQ3555B/G/R – Color TV broadcast-grade Plumbicon
XQ4187/B/G/R – 2⁄3 in (17 mm) Color TV broadcast-grade Plumbicon
XQ4502/A – 30mm/45mm Plumbicon used with X-ray image intensifiers in medical equipment, highest resolution, low lag
XQ5002 – 2 in (51 mm) Plumbicon, electrostsatic deflection for improved corner resolution, low output capacitance
XQ7002 – 1 in (25 mm) Plumbicon, low output capacitance
YL1070 = 8117 (Center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater), YL1071 = 8116 (center-tapped 26.5 V/433 mA resp. 13.25 V/866 mA heater) – 2×30 W, 60 MHz Dual linear power tetrode, Septar base
YL1080 = 8348 – 2×5 W, 200 MHz Dual power tetrode, internally neutralized, 1.6 V/2.5 A oxide-coated quickstart filament, Noval base
YL1100 (Forced-air cooled, 6.3 V/1.8 A heater), YL1101 (Forced-air cooled, 26.5 V/520 mA heater), YL1102 (Contact/conduction cooled, 6.3 V/1.8 A heater), YL1103 (Contact/conduction cooled, 26.5 V/520 mA heater) – 115 W, 400 MHz Ceramic/metal, linear beam power tetrode
YL1110 – 330 W, 400 MHz Forced-air cooled, ceramic/metal, linear beam power tetrode, 6.3 V/7.9 A heater
YL1120 = 8429 – 4 kW, 60 MHz Forced-air cooled, ceramic/metal, coaxial, linear power tetrode, 16 V/16.5 A filament
YL1121 (Forced-air cooled), YL1122 (Water-cooled) – 4 kW, 60 MHz Ceramic/metal, coaxial, linear power pentode, 12.6 V/14.5 A filament
YL1130 = 8408 – 2×4 W, 200 MHz Dual power pentode, internally neutralized, 1.1 V/2.9 A oxide-coated quickstart filament, Noval base
YL1150 = 8579 – 75 W, 60 MHz Linear beam power tetrode, center-tapped 12.6 V/1.3 A resp. 6.3 V/2.6 A heater, Septar base
YL1190 = 8580 – 2×8 W, 200 MHz Dual power tetrode, internally neutralized, 1.1 V/4.2 A quickstart filament, Magnoval base
ZA1001 – Ruggedized, Neon-filled, coaxial, Tritium-primed, sputtered-Molybdenum cold-cathode switching diode with traces of heavy gas (Krypton/Xenon) for slow de-ionization, e.g. for low-frequency relaxation oscillators, meshed cylinder anode, all-glass wire-ended
ZA1002 – Neon-filled, coaxial, Tritium-primed, sputtered-Molybdenum cold-cathode switching diode, 61 V difference between burning and ignition voltage, meshed cylinder anode, all-glass with 3 wire-ends
ZA1003 – Neon-filled, coaxial, Tritium-primed, sputtered-Molybdenum cold-cathode switching diode with traces of Argon for tightened breakdown voltage specs, used as indicator tube in transistorized circuits, meshed cylinder anode, all-glass with 3 wire-ends
ZA1004 – Ruggedized, Neon-filled, coaxial, Tritium-primed, sputtered-Molybdenum cold-cathode switching diode with traces of Argon for tightened breakdown voltage specs, used as indicator tube in transistorized circuits or as 86.4 V voltage-regulator tube, tightened specs, only 6.5 V difference between burning and ignition voltage, meshed cylinder anode, all-glass with 3 wire-ends
ZA1005 – Neon-filled, coaxial, Tritium-primed, sputtered-Molybdenum cold-cathode switching diode used like, later, a Shockley diode (or, yet later, a DIAC) in thyristor circuits, meshed cylinder anode, all-glass with 2 wire-ends
ZA1006 – Ruggedized, long-life, Neon-filled, Tritium-primed Touch button tube, a cold-cathode switching diode, 72 V difference between burning and ignition voltage, used as an illuminated capacitance touch switch, all-glass with 3 wire-ends
ZC1010 (Z661W) – 8 mAavg, 50 mApeak, Gas-filled, cold-cathode AC trigger pentode used in bidirectional counters, two starters and a keep-alive/primer anode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage
ZC1030 – 4 mA, Gas-filled, cold-cathode trigger tetrode used in high-speed counting and switching circuits, one starter and a keep-alive/primer cathode, positive starter voltage, all-glass with 4 wire-ends[573]: 719ff
ZC1031 – 3 mA, Neon-filled, cold-cathode, luminescent trigger tetrode, one starter and a keep-alive/primer cathode, 0.0018 ft-c (19.368 mlx) light output used as self-displaying shift register cells in large-format, crawling-text dot-matrix displays, all-glass wire-ended[573]: 725ff
ZC1040 – 25 mA, Gas-filled, cold-cathode AC trigger tetrode, one starter and a keep-alive/primer anode, positive starter voltage, Noval base
ZC1050 – 2 mA, Gas-filled, cold-cathode, luminescent trigger tetrode, one starter and a keep-alive/primer cathode, 300 mlm light output[574] used as self-displaying shift register cells in large-format, crawling-text dot-matrix displays,[575] all-glass wire-ended
ZC1060 – 20 mAavg, 5 kApeak, Gas-filled, cold-cathode, high-current trigger triode for e.g. capacitor discharge circuits. One external (capacitive) starter electrode
ZM1000 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 14 mm character height side-viewing, left decimal point, keep-alive/primer cathode
ZM1000R – ZM1000 with a red contrast filter coating
ZM1001 – + - ~ X Y Z Neon-filled, side-viewing digital indicator tube used with ZM1000, 14mmCH, keep-alive/primer cathode
ZM1001R – ZM1001 with a red contrast filter coating used with ZM1000R
ZM1002 – ns µs ms s Hz kHz MHz Neon-filled, side-viewing digital indicator tube used with ZM1000 in digital frequency counters, 13mmCH, keep-alive/primer cathode
ZM1003 – • 1 - ~ Neon-filled, side-viewing digital indicator tube used with ZM1000, 14mmCH
ZM1005 – 0 1 2 3 4 5 6 7 8 9 Long-life, Neon-filled, side-viewing digital indicator tube, 14mmCH, left decimal point, multiplex-capable, keep-alive/primer cathode
ZM1005R – ZM1005 with a red contrast filter coating
ZM1006 – 1 2 3 4 5 6 Neon-filled, side-viewing digital indicator tube used as program number display in TV receivers, 14mmCH, left and right decimal point; budget-priced version of ZM1000
ZM1030 = Z523M – ZM1032 with a red contrast filter coating
ZM1031 = ZM1031/01 but the ~ is not documented in its data sheet
ZM1031/01 – ZM1033/01 with a red contrast filter coating used with ZM1030
ZM1032 = Z5230M – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 15.5mmCH, no decimal point, Noval base, 5 dual cathodes and separate odd/even anode compartments for biquinary multiplexing
ZM1033/01 – + - ~ Neon-filled, side-viewing digital indicator tube used with ZM1032, 15.5mmCH, Noval base, separate anode compartment for +
ZM1040 = Z522M – ZM1042 with a red contrast filter coating
ZM1041 – ZM1043 with a red contrast filter coating used with ZM1040
ZM1041S – ZM1043S with a red contrast filter coating used with ZM1040
ZM1042 = Z5220M – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 30mmCH, no decimal point
ZM1043 – + - Neon-filled, side-viewing digital indicator tube used with ZM1042, 30mmCH
ZM1043S – Y X + W U Z - Neon-filled, side-viewing digital indicator tube used with ZM1042, 30mmCH
ZM1047 – ZM1049 with a red contrast filter coating used with ZM1040
ZM1049 – T F S N Z Y G H M X Neon-filled, side-viewing digital indicator tube used with ZM1042 in numerical control systems
ZM1050ZM1070 = Z550M = 8453 – Pixie Neon-filled, top-viewing digital indicator tube for transistorized circuits, Dekatron-type readout with common anode and common cathode, pulsating anode voltage, controlled by 5-volts sensitive starter electrodes
ZM1130 – ZM1132 with a red contrast filter coating
ZM1131 – ZM1133 with a red contrast filter coating used with ZM1080
ZM1132 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 13mmCH, left and right decimal point
ZM1133 – + - ~ Neon-filled, side-viewing digital indicator tube used with ZM1132, 14mmCH
ZM1134 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 13mmCH, right decimal point
ZM1136L/R – ZM1138L/R with a red contrast filter coating
ZM1137 – ZM1139 with a red contrast filter coating used with ZM1136L/R
ZM1138L/R – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 13mmCH, left or right decimal points (specify)
ZM1139 – + - ~ Ω Neon-filled, side-viewing digital indicator tube used with ZM1138 in digital multimeters, 13mmCH
ZM1162 – 0 1 2 3 4 5 6 7 8 9 Long-life Neon-filled, top-viewing digital indicator tube, 15.5mmCH, no decimal point, rectangular envelope for close stacking in both axes
ZM1170 – ZM1172 with a red contrast filter coating
ZM1172 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 15.5mmCH, no decimal point
ZM1174 – ZM1175 with a red contrast filter coating
ZM1175 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 15.5mmCH, left decimal point
ZM1176 – ZM1177 with a red contrast filter coating
ZM1177 – ZM1175, but right decimal point
ZM1180 – ZM1182 with a red contrast filter coating
ZM1181 – ZM1183 with a red contrast filter coating used with ZM1180
ZM1182 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, top-viewing digital indicator tube, 16mmCH, no decimal point, semi-rectangular envelope for close horizontal stacking
ZM1183 – + - ~ Ω Neon-filled, top-viewing digital indicator tube used with ZM1182 in digital multimeters, 13mmCH
ZM1184D – ZM1185D with a red contrast filter coating
ZM1185 – Neon-filled, top-viewing digital indicator tubes used in elevators, 16mmCH:
ZM1186 – ZM1188 with a red contrast filter coating
ZM1188 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, top-viewing digital indicator tube, 15.5mmCH, left decimal point, semi-rectangular envelope for close horizontal stacking
ZM1200 – Pandicon, multiplexed 14-digit display tube with decimal points and punctuation marks, pin connections on both ends
ZM1202 – 12-Digit Pandicon
ZM1204 – 10-Digit Pandicon
ZM1206 – 8-Digit Pandicon
ZM1210ZM1212 – ZM1212 with a red contrast filter coating
ZM1212 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 15.5mmCH, left decimal point, all-glass wire-ended
ZM1220 – ZM1222 with a red contrast filter coating
ZM1222 – 0 1 2 3 4 5 6 7 8 9 Large Neon-filled, side-viewing digital indicator tube, 40mmCH
ZM1230 – ZM1232 with a red contrast filter coating
ZM1232 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH upside-down side-viewing, no decimal point
ZM1237 – ⅛ ¼ ⅜ ½ ⅝ ¾ ⅞ Neon-filled digital indicator tube, 15.5mmCH upside-down side-viewing
ZM1240 – ZM1242 with a red contrast filter coating
ZM1241 – ZM1243 with a red contrast filter coating used with ZM1240
ZM1242 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 16mmCH, right decimal point
ZM1243 – + - ~ Ω Neon-filled, side-viewing digital indicator tube used with ZM1242 in digital multimeters, 16mmCH
ZM1250 – Planar, Neon-filled, one-character alphanumeric 5×7 dot-matrix display with a left decimal point, 9.8mmCH, all 36 cathodes directly accessible
ZM1263 – Spiral symbol and ~ + - Neon-filled, side-viewing digital indicator tube, 10mmCH
ZM1290 – ZM1292 with a red contrast filter coating
ZM1310 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, right decimal point, 12.5mmCH
ZM1320 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, right decimal point, 12.5mmCH
ZM1325 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, right decimal point, 9.5mmCH
ZM1330 – ZM1332 with a red contrast filter coating
ZM1331 – ZM1333 with a red contrast filter coating used with ZM1330
ZM1332 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 13.1mmCH, left and right decimal points, all-glass wire-ended
ZM1333 – + - ~ Ω Neon-filled, side-viewing digital indicator tube used with ZM1332 in digital multimeters, 13.1mmCH, all-glass wire-ended
ZM1334 – ZM1336 with a red contrast filter coating
ZM1335 – ZM1337 with a red contrast filter coating used with ZM1334
ZM1336 – 0 1 2 3 4 5 6 7 8 9 Neon-filled, side-viewing digital indicator tube, 13.1mmCH, left and right decimal points, multiplex-capable
ZM1337 – + - ~ Ω Neon-filled, side-viewing digital indicator tube used with ZM1336 in digital multimeters, 13.0mmCH, right decimal point (!), all-glass wire-ended, red contrast filter coating
ZP1600 – X-ray detecting, Halogen-quenched Geiger-Müller tube, 19.8 mm diameter mica window, 6.0 to 20 keV energy, 60 to 200 pm wavelength range
ZP1610 – X-ray detecting, Side window, Xenon-filled organically quenched Geiger-Müller tube, 7 × 18 mm mica window, 2.5 to 40 keV energy, 30 to 500 pm wavelength range
ZP1700 – Halogen-quenched, cosmic-ray guard counter tube for low-background measurements, to be used with another radiation counter tube in an anticoincidence circuit
ZP1800 – γ-detecting, Halogen-quenched Geiger-Müller tube for use at temperatures up to 200 °C
ZP1810 – γ-detecting, Halogen-quenched Geiger-Müller tube for use at temperatures up to 200 °C, low sensitivity, up to 40 mGy/h
ZP1860 – β and γ-detecting, Halogen-quenched Geiger-Müller tube
ZT1000 = 8270 – 21 kV, 5 Aavg, 20 Apeak, 200 Asurge Mercury-vapor triode thyratron, negative control characteristic, 5 V/13 A filament, B4D Superjumbo base
ZT1011 = XR1-1600A = 8063 – 1 kV, 1.6 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, center-tapped 2.5 V/8.5 A filament
ZT1020 – 500 V, 25 mAavg, 100 mApeak, 2 Asurge Xenon tetrode thyratron, negative control characteristic, Miniature 7-pin base; long-life, pulse-rated version of 5696Va (EN92)
ZZ1000 = 8228 – 80.1 to 82.5 V, 2 to 4 mA Subminiature voltage-regulator tube, all-glass with 2 wire-ends
ZZ1010 – 81.1 to 85.2 V, 4 to 70 mA Voltage-regulator tube with a priming anode, Miniature 7-pin base
ZZ1020 = Telefunken STV85-8 – 81.1 to 85.3 V, 1.7 to 8 mA Subminiature voltage-regulator tube with a priming anode, all-glass with 3 wire-ends
ZZ1030 = Telefunken STV500-0,1 – Quad 123 to 127 V, 90 to 500 µA voltage-regulator tube, used all series-connected to stabilize the dynode voltages of photomultipliers, Noval base
ZZ1031 – Quad Voltage-regulator tube, Noval base
ZZ1040 = Telefunken STV100-60Z – 98 to 101 V, 5 to 60 mA Voltage-regulator tube with a priming anode, Magnoval base
ZZ1050 – 82 V Subminiature voltage-regulator tube, all-glass with 2 wire-ends
Spin-tuned Magnetrons (having a spinner which cyclically varies the coupling between cavities and thus the frequency, sweeping through the full tuning range back and forth sinusoïdally) for use in frequency agile radars or in barrage jamming systems, equipped with a 115V/400Hz (avionics standard) synchronous motor effecting 16 sweep periods per revolution
JPS9-80C = YJ1170 – 70 kW, 8.5 to 9.3 GHz Forced-air cooled, motor-tuned (Δf of 475 MHz in 500 µs), pulsed Magnetron[576]
JPS9-200 = YJ1180 – 180 kW, 8.7 to 9.5 GHz Forced-air cooled, motor-tuned (Δf of 450 MHz in 500 µs), pulsed Magnetron
PC03/3 (4 V/130 mA filament), PC03/3A (2 V/240 mA filament), PC03/3B (4 V/130 mA filament) – 3 W, 20 MHz Shortwave power pentode, P8A side-contact 8 base with anode on top cap
PC05/15 – 15 W, 20 MHz Shortwave power pentode, 4 V/1.1 A filament, P8A side-contact 8 base with anode on top terminal
PC1/50, PC1/50I – 35 W, 20 MHz Shortwave power pentode, 4 V/2 A filament, 4-pin base with anode on top terminal
PC1.5/100 – 85 W, 20 MHz Shortwave power pentode, 10 V/2 A filament, 4-pin base with anode on top terminal
PC3/1000 – 600 W, 3 MHz Shortwave power pentode, 12 V/4 A filament, 5-pin base with anode on top terminal
PE04/10 = PE04/10P (P8A side-contact 8 base), PE04/10E (American U7A base) – 10 W, 20 MHz Shortwave power pentode, 12 V/650 mA heater, anode on top cap
PE05/15 – 15 W, 20 MHz Shortwave power pentode, 12 V/370 mA heater, P8A side-contact 8 base with anode on top cap
PE05/25 – 12 W, 100 MHz Power pentode, 12.6 V/700 mA heater, 8-pin base
PE06/40 = PE06/40P (6.3 V/1.3 A heater, P8A side-contact 8 base), PE06/40E (12.6 V/650 mA heater, American U7A base), PE06/40N (6.3 V/1.3 A heater, American UY5 base) – 25 W, 60 MHz Shortwave power pentode, anode on top cap
PE1/80 – 35 W, 20 MHz Shortwave power pentode, 12 V/900 mA heater, P8A side-contact 8 base with anode on top cap
PE1/100 = YL1200 = 6083 – 45 W, 60 MHz Shortwave power pentode, 12.6 V/1.35 A heater, Septar base
QB2/75 – 75 W Radiation-cooled power tetrode, 10 V/3.25 A filament, 4-pin base with anode and control grid on top and side wires
QB2/250 (813) – 100 W, 30 MHz Radiation-cooled beam power tetrode, 10 V/5 A filament, B7D/U7G Giant 7-pin base with anode on top cap
QB3/200 (8165, Eimac 4-65A) – 65 W, 50 MHz Radiation-cooled beam power tetrode, 6 V/3.5 A filament, 5-pin Septar base with anode on top cap
QB3/300 (6155, 4D21, Eimac 4-125A), QB3/300GA (With a metal shell around the base) – 125 W, 120 MHz Radiation-cooled beam power tetrode, 5 V/6.5 A filament, B5F Giant 5-pin UY base with anode on top cap
QB3/500 – 350 W, 2 MHz Radiation-cooled power tetrode, 11 V/10 A filament
QB3.5/750 (6156, 5D22, Eimac 4-250A), QB3.5/750GA (With a metal shell around the base) – 250 W, 75 MHz Radiation-cooled beam power tetrode, 5 V/14.1 A filament, B5F Giant 5-pin UY base with anode on top cap
QB4/1100 = YL1460 = 7527 = RS1002A, QB4/1100GA (With a metal shell around the base) – 400 W, 110 MHz Radiation-cooled beam power tetrode, 5 V/14.1 A filament, B5F Giant 5-pin UY base with anode on top cap
QB5/1750 = 6079 – 500 W, 60 MHz Radiation-cooled beam power tetrode, 10 V/9.9 A filament, B5F Giant 5-pin UY base with anode on top pin
QB5/2000 – 800 W, 30 MHz Radiation-cooled beam power tetrode, 7.5 V/22.6 A filament, B5K Supergiant 5-pin UY base with anode on top pin
QE04/10 – 7.5 W, 60 MHz Beam power tetrode, 6.3 V/600 mA heater, B9G 9-pin Loctal base
QE05/40 (6.3 V/1.25 A heater, 6146), QE05/40F (12.6 V/625 mA heater, 6883), QE05/40H (26.5 V/300 mA heater, 6159) – 25 W, 60 MHz Radiation-cooled beam power tetrode, Octal base with anode on top cap, popular among radio amateurs as a final RF amplifier
QE06/50 = 807 – 25 W, 60 MHz Radiation-cooled beam power tetrode, 6.3 V/900 mA heater, UY5 base
QE08/200 (6.3 V/3.9 A heater, 7378), QE08/200H = 7836 (26.5 V/850 mA heater) – 100 W, 30 MHz Beam power tetrode, B5F Giant 5-pin UY base with anode on top cap
QQE02/5 = 6939 – 2×3 W, 500 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
QQE03/12 = 6360 – 2×5 W, 200 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/410 mA resp. 6.3 V/820 mA heater, Noval base
QQE03/20 = 6252 – 2×10 W, 200 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base with anodes on top pins
QQE04/5 (7377) – 2×10 W, 960 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, special 10-pin base
QQE04/20 (832A) – 2×7.5 W, 200 MHz Dual power tetrode, center-tapped 12.6 V/800 mA resp. 6.3 V/1.6 A heater, Septar base with anodes on top pins
QQE06/40 = 5894 (YL1060) – 2×20 W, 250 MHz Dual power tetrode, internally neutralized, center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater, Septar base with anodes on top pins
QQV02-6 – 2×3 W, 500 MHz Dual power tetrode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
QQV03-10 – 2×5 W, 100 MHz Radiation-cooled dual power tetrode, center-tapped 12.6 V/420 mA resp. 6.3 V/830 mA heater, Noval base
QQV03-20A – 2×10 W, 200 MHz Radiation-cooled dual power tetrode, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base with anodes on top pins, made by Mullard and used in the 1940s, 1950s and 1960s as a VHF frequency-doubling output amplifier with balanced output
QQV03-25 – 2×12.5 W, 180 MHz Radiation-cooled dual power tetrode, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base with anodes on top pins
QQV04-15 – 2×7.5 W, 200 MHz Radiation-cooled dual power tetrode, center-tapped 12.6 V/800 mA resp. 6.3 V/1.6 A heater, Septar base with anodes on top pins
QQV04-16 – 2×8 W, 960 MHz Radiation-cooled dual power tetrode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, special 10-pin base
QQV06-40A – 2×20 W, 200 MHz Radiation-cooled dual beam power tetrode, center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater, Septar base with anodes on top pins
QQV07-40 – 2×20 W, 100 MHz Dual beam power tetrode, center-tapped 12.6 V/1.25 A resp. 6.3 V/2.5 A heater, MVH17 base with anodes on top pins
QQV07-50 – 2×25 W, 200 MHz Dual beam power tetrode, center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater, Septar base with anodes on top pins
QQV5-P10 – 5 kV, 10 A, 2×7.5 W Radiation-cooled, pulse-rated dual power tetrode used as a modulator at duty factor 0.001, center-tapped 12.6 V/1.2 A resp. 6.3 V/2.4 A heater, Septar base with anodes on top pins
QYS50-P40 – Pulse-rated power tetrode, Silica envelope, 50 kV anode voltage, considerable X-radiation, 810 °C anode temperature at 700 W anode dissipation, 40 A anode current at duty factor 0.0005, Ug1Cut-off (IA=1 mA@UA=55 kV): > -3.4 kV, gm = 38 mS, 11.5 V/64 A filament
TA04/5 – 400 V, 10 W Radiation-cooled power triode, 5 V/1.6 A filament, A4A (optionally UX4) 4-pin base
TA08/10 – 800 V, 20 W Radiation-cooled power triode, 5.7 V/1.9 A filament, A4A (optionally UX4) 4-pin base
TA1/40 – 1 kV, 70 W Radiation-cooled power triode, 10 V/5.5 A filament, 3-pin base with anode on top cap
TA1.5/75 – 1.5 kV, 75 W, 20 MHz Radiation-cooled power triode, 11 V/6 A filament, 2-pin base with anode and control grid on top and side terminals
TA3/200 – 3 kV, 150 W, 3 MHz Radiation-cooled power triode, 14 V/4 A filament, 3-pin base with anode on top cap
TA3/500 (Anode on top terminal, 2 MHz), TA3/500K (anode on side terminal, 6.6 MHz) – 3 kV, 400 W Radiation-cooled power triode, 16 V/8.5 A filament, 3-pin base with grid on side terminal
TA4/250 – 4 kV, 250 W, 2 MHz Radiation-cooled power triode, 12.5 V/5.5 A filament
TA4/800 – 4 kV, 500 W, 2 MHz Radiation-cooled power triode, center-tapped 23 V/14.7 A filament
TA4/1500, TA4/1500K – 5 kV, 750 W, 3 MHz Forced-air cooled power triode, 16 V/16 A filament, 3-pin base with anode and control grid on side terminals
TA4/2000 – 4 kV, 1 kW, 3 MHz Forced-air cooled power triode, 22 V/24.5 A filament, 3-pin base with anode and control grid on top and side terminals, made by Philips in the 1930s
TA5/4000 – 5 kV, 5 kW, 2 MHz Water-cooled power triode, 22 V/41 A filament
TA7/700 – 7 kV, 400 W Radiation-cooled power triode, 12.5 V/7.7 A filament
TA8/300 – 8 kV, 150 W Radiation-cooled power triode, 9 V/5.6 A filament
TA10/600 – 12 kV, 200 W, 2 MHz Radiation-cooled power triode, 12.5 V/6.3 A filament
TA10/1250 – 12 kV, 400 W Radiation-cooled power triode, 15 V/9.5 A filament
TA10/1750 – 12 kV, 600 W Radiation-cooled power triode, 17 V/15 A filament
TA10/2500 – 12 kV, 750 W Radiation-cooled power triode, 12.5 V/24 A filament
TA10/5000K, TA10/5000KI – 12 kV, 5 kW, 2 MHz Water-cooled power triode, 21.5 V/26 A filament
TA12/10000 – 12 kV, 12 kW, 1 MHz Water-cooled power triode, 22 V/38.5 A filament
TA12/15 – 12 kV, 7.5 kW, 2 MHz Water-cooled power triode, 22 V/41 A filament
TA12/20000 – 12 kV, 15 kW, 1 MHz Water-cooled power triode, 22 V/77 A filament
TA12/20 – 15 kV, 18 kW, 2 MHz Water-cooled power triode, 21.5 V/79 A filament
TA12/35 – 15 kV, 18 kW, 15 MHz Water-cooled power triode, 3-phase filaments internally star-connected with center/neutral available, 49 VΔ/50 AY each
TA18/100000 (18 kV), TA18/100 (20 kV) – 70 kW, 2 MHz Water-cooled power triode, 33 V/207 A filament
TA20/250 – 20 kV, 130 kW, 3 MHz Water-cooled power triode, 35 V/420 A filament
TYS2-250 – 2.5 kV, 250 W Power triode, Silica envelope, 6.3 V/12 A filament
TYS4-500 – Power triode, Silica envelope, 10 V/10 A filament
TYS5-1000 – Power triode, Silica envelope, 10 V/26 A filament
TYS5-2000 – Power triode, Silica envelope, 14.5 V/26 A filament
TYS5-3000 – Power triode used in RF generators for induction hardening, Silica envelope, 6 kV anode voltage, 950 °C anode temperature at 3.5 kW anode dissipation, 2.8 A cathode current, gm = 15 mS, 20.5 V/26 A filament
XGQ2-6400 – 2 kV, 6.4 A Mercury-vapor tetrode thyratron with anode and #1 grid top caps, negative control characteristic, half-indirect 5 V/10 A heater
XR1-1600, XR1-1600A = ZT1011 = 8063 – 1 kV, 1.6 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, center-tapped 2.5 V/8.5 A filament
XR1-3200 = 5544, XR1-3200A = 7981 – 1.5 kV, 3.2 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, 2.5 V/12 A filament
XR1-6400 (5545) – 1 kV, 6.4 A Gas-filled triode thyratron with anode on top cap, negative control characteristic, 2.5 V/21 A filament
XR1-12 (5855) – 1.5 kV, 12.5 A Gas-filled triode thyratron with anode on top cap
4XP – Directly AC-heated power triode, 4 V/1 A filament, European 4-pin base
41MDG – Dual-grid triode, 4 V/1 A heater, O5A European 5-pin base
41MP – Power triode, 4 V/1 A heater, O5A European 5-pin base
41MPG = Brimar 15A2 = Ferranti VHT4 = M-OV/GEC MX40 – Remote-cutoff heptode pentagrid converter, 4 V/1 A heater, M7A British 7-pin base
41MXP = Brimar PA1 = EdiSwan AC/P1 = Mullard O54V – Power triode, 4 V/1 A heater, O5A European 5-pin base
41STH = Brimar 20A1 = EdiSwan AC/TH1 = M-OV/GEC X41 = Mullard TH4A – Triode/hexode oscillator/mixer, 4 V/1.15 A heater, M7A British 7-pin base
210DET – Gas-filled triode used as AM detector, 2 V/100 mA filament, European 4-pin base
210HF – Triode, 2 V/100 mA filament, European 4-pin base
210HL – Triode, 2 V/100 mA filament, European 4-pin base
210LF – Triode, 2 V/100 mA filament, European 4-pin base
210PG – Remote-cutoff heptode pentagrid converter, 2 V/100 mA filament, M7A British 7-pin base
210RC – Very high-μ triode, 2 V/100 mA filament, European 4-pin base
210SPT – Sharp-cutoff RF pentode, 2 V/100 mA filament, M7A British 7-pin base
210VPT – Shielded remote-cutoff RF pentode, 2 V/100 mA filament, M7A British 7-pin base
215P – AF Power triode, 2 V/150 mA filament, European 4-pin base
220B – Dual power triode, 2 V/200 mA filament, M7A British 7-pin base; not to be confused with the Western Electric 220B single power triode
220PA – Power triode, 2 V/200 mA filament, European 4-pin base
220PT – Power triode, 2 V/200 mA filament, European 4-pin base
230XP – Power triode, 2 V/300 mA filament, European 4-pin base
240B – Dual AF power triode, 2 V/400 mA filament, M7A British 7-pin base; not to be confused with the Amperex 240B single power triode
402P – Power triode, 40 V/200 mA heater, M7A British 7-pin base
410HF – Triode, 4 V/100 mA filament, European 4-pin base
610RC – Signal triode, 5.5 V/100 mA filament, European 4-pin base
660SU – 1 kV, 150 mA Half-wave rectifier, 6 V/4.5 A filament, European 4-pin base
825BU – 500 V, 120 mA Full-wave rectifier, 7.5 V/2 A filament, European 4-pin base
3180, 3184 – Neon-filled bar graph indicator, a glass tube with a short anode, a keep-alive/primer anode and a long wire cathode that glows partially, the glow length is proportional to the tube current; similar to GEC TuneOn, Philips 4662, ИН-9
DD/PEN – Dual diode + remote-cutoff AF pentode used as feed-forwardAGC, 4 V/1 A heater, M7A British 7-pin base
DDT = Brimar 11A2 = EdiSwan AC/HLDD = M-OV/GEC MHD4 = Mullard TDD4 – Dual diode + triode, 4 V/1 A heater, M7A British 7-pin base
DDT16 – Dual diode + high-μ triode, 16 V/250 mADC heater, M7A British 7-pin base
DHL – Medium-μ triode, 16 V/250 mADC heater, O5A European 5-pin base
DP – Power triode, 16 V/250 mADC heater, O5A European 5-pin base
DP/PEN – Power pentode, 16 V/250 mADC heater, M7A British 7-pin base
DS/PEN – Pentode, 16 V/250 mADC heater, O5A European 5-pin base
DVS/PEN – Remote-cutoff pentode, 16 V/250 mADC heater, O5A European 5-pin base
DVSG – Remote-cutoff tetrode, 16 V/250 mADC heater, O5A European 5-pin base
PT41 – Power pentode, 4 V/1 A filament, O5A European 5-pin base
AC/HL – Medium-μ AF triode, 4 V/1 A heater, O5A European 5-pin base
AC/HLDD = Brimar 11A2 = Cossor DDT = M-OV/GEC MHD4 = Mullard TDD4 – Dual diode + AF triode, 4 V/1 A heater, M7A British 7-pin base with control grid on top cap
AC/ME – "Magic Eye"-type tuning indicator, 4 V/500 mA heater; ME41 with a Shouldered envelope and a M7A British 7-pin base
AC/P (4 W, μ=10), AC/P1 = Brimar PA1 = Cossor 41MXP = Mullard O54V (5 W, μ=5.4) – AF power triodes, 4 V/1 A heater, O5A European 5-pin base
AC/P4 – CRT electrostatic-deflection output power triode, 4 V/1 A heater, O5A European 5-pin base with anode on top cap, binned into grades Q (μ<20), R (μ=20), S (μ>20)
AC/PEN = Brimar 7A2 = Cossor MP/PEN = Mullard PEN4VA – AF power pentode, 4 V/1 A heater, M7A British 7-pin base
AC/S2PEN = Brimar 8A1 = Cossor MS/PEN = Ferranti SPT4 = M-OV/GEC MSP4 = Mullard SP4 – RF pentode, 4 V/1 A heater, M7A British 7-pin base with anode on top cap
AC/SP1 – Dual-control RF pentode used in squelch circuits or as the reactance tube in AFC circuits, suppressor grid on a separate pin to feed a gain-control voltage to,[87] 4 V/1 A heater, M7A British 7-pin base
AC/SP3 – Dual-control RF pentode used in shortwave and TV receivers, 4 V/1 A heater, M7A British 7-pin base with control grid on top cap
AC/SP3/RH – AC/SP3 upgraded for low-hum, low-microphonics and low-noise, binned into grades A (15 dB less hum, 18 dB less microphonics) and B
AC/TH1 = Brimar 20A1 = Cossor 41STH = M-OV/GEC X41 = Mullard TH4A – Triode/hexode oscillator/mixer, 4 V/1.3 A heater, M7A British 7-pin base with hexode control grid #1 on top cap
AC/TP = Mullard TP4 – 2 MHz Triode/remote-cutoff pentode oscillator/mixer, 4 V/1.25 A heater, B9H British 9-pin base with the pentode control grid on top cap
AC/VP1 = Brimar 9A1 = Cossor MVS/PEN = M-OV/GEC VMP4 = Mullard VP4 = Ferranti VPT4 (Anode on top cap), AC/VP2 (control grid on top cap) – RF Remote-cutoff pentode, 4 V/650 mA heater, M7A British 7-pin base
AC2/HL = Brimar HLA2 = Cossor 41MH = Ferranti D4 = M-OV/GEC MH41 = Mullard 904V – Medium-μ triode, 4 V/1 A heater, O5A European 5-pin base
AC2/PEN = Brimar 7A3 = Cossor 42MP/PEN = Ferranti PT4 = Mullard PEN4VB – AF power pentode, 4 V/1.75 A heater, M7A British 7-pin base
AC2/PENDD – Dual diode + AF power pentode, 4 V/2 A heater, M7A British 7-pin base with control grid on top cap
AC4/PEN – AF beam power pentode, 4 V/1.75 A heater, M7A British 7-pin base
AC5/PEN – AF beam power pentode, 4 V/1.75 A heater, M7A British 7-pin base
AC5/PENDD – Dual diode + AF beam power pentode, 4 V/2 A heater, M7A British 7-pin base with control grid on top cap
AC6/PEN – Beam power pentode used as a magnetic horizontal deflection output amplifier, 4 V/1.75 A heater, M7A British 7-pin base with anode on top cap
DC/HL – Medium-μ triode, 6 V/500 mADC heater, O5A European 5-pin base
DC/P – AF power triode, 8 V/500 mADC heater
DC/PEN – AF power pentode, 8 V/500 mADC heater, O5A European 5-pin base
DC/SG – RF tetrode, 6 V/500 mADC heater, O5A European 5-pin base
DC3/HL – Medium-μ triode, 25 V/100 mADC heater, O5A European 5-pin base
FC141 – Heptode pentagrid converter with British grid topology, 1.4 V/50 mA filament, MazdaOctal base
H141D – Diode + AF triode, 1.4 V/50 mA filament, MazdaOctal base
HL41DD (Medium-μ), HL42DD (Vari-μ for feed-forwardAGC) – Dual diode + AF triode, 4 V/650 mA heater, MazdaOctal base with control grid on top cap
ME41 – "Magic Eye"-type tuning indicator, 4 V/500 mA heater, MazdaOctal base, Glass Tubular envelope; Shouldered version with M7A British 7-pin base: AC/ME
ME91 – "Magic Eye"-type tuning indicator used in AC/DC series heater radios, 9 V/200 mA heater, MazdaOctal base, Glass Tubular envelope
ME920 – "Magic Eye"-type tuning indicator used in AC/DC series heater radios, 9 V/200 mA heater, M7A British 7-pin base, Shouldered envelope
P41 (4 V/950 mA heater), P61 (6.3 V/600 mA heater) – RF triode, μ = 17, MazdaOctal base
P220 (μ = 12.5), P220A (μ = 6.5) – AF Power triode used as driver for the PD220, 2 V/200 mA filament, A4A European 4-pin base
PD220(gm = 900 µS), PD220A(gm = 1.6 mS) – Dual AF power triode designed for operation with positive grid bias, 2 V/200 mA filament, M7A British 7-pin base (1939); cf. Triple-Twin
Pen24 – 440 mW Class-A output AF power pentode, 2 V/300 mA filament, MazdaOctal base
Pen25 – 400 mWout AF Power pentode, 2 V/150 mA filament, MazdaOctal base
Pen44 – 18 W AF Beam power tetrode, 4 V/2.1 A heater, MazdaOctal base
Pen45 – 5.8 Wout AF Beam power tetrode, 4 V/1.75 A heater, MazdaOctal base
Pen45DD – Pen45 + Dual diode, 4 V/2 A heater, MazdaOctal base with control grid on top cap
Pen46 – 20 W Beam power tetrode used as CRT horizontal deflection amplifier, 4 V/1.75 A heater, MazdaOctal base with anode on top cap
Pen141 – 240 mWout AF Power pentode, 1.4 V/100 mA filament, MazdaOctal base
Pen220 – 290 mWout AF Power pentode, 2 V/200 mA filament, O5A European 5-pin base
Pen231 – 350 mWout AF Power pentode, 2 V/300 mA filament, O5A European 5-pin base
Pen383 – 10 W AF Beam power tetrode, 38 V/200 mA heater, MazdaOctal base
Pen384 – 10 W AF Beam power tetrode for use on 110V mains, 38 V/200 mA heater, MazdaOctal base
Pen453DD – Dual diode + 10 W AF Beam power tetrode, 45 V/200 mA heater, MazdaOctal base with control grid on top cap
Pen3520 – 8 W AF Power pentode, 35 V/200 mA heater, M7A British 7-pin base
Pen3820 – 10 W AF Beam power tetrode, 38 V/200 mA heater, M7A British 7-pin base
PenDD4020 – Dual diode + 10 W AF power pentode, 40 V/200 mA heater, M7A British 7-pin base
PenDD4021 – Dual diode + 10 W AF Beam power tetrode, 45 V/200 mA heater, M7A British 7-pin base
QP25 – Quiescent Push-Pull Dual AF power pentode, gm = 3 mS, 2 V/200 mA filament, MazdaOctal base
QP230 – QPP Dual AF power pentode, gm = 3 mS, 2 V/300 mA filament, M7A British 7-pin base
QP240 – QPP Dual AF power pentode, gm = 4 mS, 2 V/450 mA filament, B9H British 9-pin base
SP41 (4 V/950 mA heater), SP61 (6.3 V/600 mA heater) – Sharp-cutoff RF pentode, gm = 8.5 mS, MazdaOctal base
SP141 – Sharp-cutoff RF pentode, gm = 900 µS, 1.4 V/50 mA filament, MazdaOctal base
TH41 (4 V/1.3 A heater), TH233, TH2320, TH2321 (23 V/200 mA heater) – Triode/heptode oscillator/mixer, MazdaOctal base with heptode control grid on top cap
TP22, TP23, TP25, TP26 (2 V/200 mA filament), TP2620 (26 V/200 mA heater) – Triode/pentode oscillator/mixer, pentode control grid on top cap
AEI-EdiSwan used more freeform designations for professional tubes[49][50]
11A1 – 300 V, 15 W Power triode used as series-pass regulator in stabilized DC power supplies, 6.3 V/950 mA heater, Noval base
11D12 – 550 V, 2×13 W Separate cathodes dual power triode used as series-pass regulator in stabilized DC power supplies, 6.3 V/2.5 A heater, Octal base
11E1 – 25 W AF Beam power tetrode, 6.3 V/1.2 A heater
11E2 – Pulse-rated beam power tetrode, 6.3 V/900 mA heater, Octal base
11E3 – Pulse-rated beam power tetrode, 4 V/2.5 A heater, M7A British 7-pin base
11E13 – 2×5 W, 225 MHz Dual power tetrode, center-tapped 12.6 V/420 mA resp. 6.3 V/830 mA heater, Noval base
11E15 – 2×20 W, 500 MHz Dual power tetrode, center-tapped 12.6 V/900 mA resp. 6.3 V/1.8 A heater, B7A Septar base
11E16 – 2×20 W, 600 MHz Dual power tetrode, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, B7A Septar base
12E1, 12E13, 12E14 – 35 W Beam power tetrode used as series-pass regulator in stabilized DC power supplies, 6.3 V/1.6 A heater, Octal base
12E12 – 60 W Pulse-rated beam power tetrode, 26 V/1.6 A heater, ventilated 4-pin base
13E1 = 7972 = EEV C1158, 13E12 – 90 W Beam power tetrode used in DC power supplies, center-tapped 26 V/1.3 A resp. 13 V/2.6 A heater, B7A Septar base
14D12 – 6 kV, 500 W, 60 MHz Radiation-cooled power triode, Graphite anode, μ = 22, 5 V/32.5 A thoriated Tungsten filament, 4-pin base
14D13 = V1505 – 3 kV, 275 W, 1.5 MHz Radiation-cooled power triode, Graphite anode, μ = 16, 14 V/6.5-7 A thoriated Tungsten filament, 4-pin base
15D12 – 6 kV, 800 W, 60 MHz Radiation-cooled power triode, Graphite anode, μ = 23, 6.3 V/31-34 A thoriated Tungsten filament, 4-pin base
15J12 – 7 kV, 1.3 kW, 60 MHz Forced-air cooled power triode, μ = 22, 6.3 V/32.5 A thoriated Tungsten filament, 4-pin base
15P12 – 7 kV, 650 W, 60 MHz Water-cooled power triode, μ = 21, 5 V/32.5 A thoriated Tungsten filament, 4-pin base
15V12 – 7 kV, 1.3 kW, 60 MHz Water/vapor-cooled power triode, μ = 22, 6.3 V/32.5 A thoriated Tungsten filament
19E2 – Pulse rectifier, 4 V/2 A heater, Octal base
19G3 – Half-wave rectifier, 4 V/1.4 A heater, Octal base
19G6 – Half-wave rectifier, 4 V/500 mA heater, Miniature 7-pin base
19H1 (A4A European 4-pin base), 19H4 (Octal base) – CRT EHT rectifier, 4 V/2 A filament
19H5 – Damper/rectifier diode, 4 V/4 A heater, E40 Goliath Edison screw lamp base
22M1 – Cold-cathode, gas-filled, linear light source (glow modulator tube) diode for rotating-drum FAX receivers, etc., 2-pin Octal base
29C1 – 100 V, 3 mA Directly heated, thermally-limited (=saturated) emission diode used as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, 4 V/800 mAmax uncoated Tungsten filament
MR15 – 20 kV, 15 Apeak Mercury-vapor triode thyratron, 4 V/15 A filament, E40 GoliathEdison screw lamp base with grid on lateral wire and anode on top terminal
MR304 – 14 kV, 3 Apeak, 750 mAavg Mercury-vapor triode thyratron, 4 V/12.5 A filament, E40 Goliath Edison screw lamp base with grid on lateral wire and anode on top terminal
PA20 – 15 W Directly AC-heated AF power triode, μ = 6.5, 2 V/2 A filament, A4A European 4-pin base
PA40 – 40 W Directly AC-heated AF power triode, μ = 4.25, 4 V/2 A filament, A4A European 4-pin base
T11 (Neon, 5 kHz), T21 (15 kHz) – 300 mApeak Triode thyratron, negative control characteristic, 4 V/1.2 A heater, O5A European 5-pin base with anode on top cap
T31 (O5A European 5-pin base with anode on top cap), T41 (Octal base) – 500 mApeak Triode thyratron, negative control characteristic, 4 V/1.5 A heater
V339 – Triode for use in vacuum tube volt meters, μ = 73, 4 V/580 mA heater, M7A British 7-pin base with control grid on top cap
V453 – Shielded, low-noise, low-microphonics, low-hum RF pentode, 4 V/650 mA heater, MazdaOctal base with control grid on top cap
B1152 – 500 W, 50 MHz Power triode, 5 V/32.5 A filament, ventilated 4-pin base
B1153 – 800 W, 50 MHz Power triode, 6.3 V/32.5 A filament, ventilated 4-pin base
QT1257 – Touch button tube, an illuminated capacitance touch switch - a cold-cathode DC relay tube, external (capacitive) starter activated by touching, then the cathode glow is visible. 6-pin Octal base
XL601, XL602, XL603, XL627, XL628, XL631 and XL632 – Cold-cathode, gas-filled, linear, blue-violet light source (glow modulator tube) diode for rotating-drum FAX receivers, etc., modulation up to 1 MHz, 2-pin Octal base
GS12D – Neon-filled, 4 kHz max. duodecimal Counter/Selector Dekatron, B12A Duodecal 12-pin base with anode on bottom cap and two additional wires for the guide electrodes
GSA10G – 10 kHz max. Decade Counter/Selector Dekatron with routing guides and aux anodes to directly drive Nixie tubes, B27A base
GTE120Y – 5 mA Subminiature DC trigger tetrode, one starter and one keep-alive/primer anode, all-glass wire-ended
GTE130T – 8 mApeak DC trigger tetrode, one starter and one keep-alive/primer anode, close tolerance, low aging, quadrant I operation only, Noval base
GTE175M – 3.5 mAavg, 50 mApeak DC Trigger tetrode for Dekatron coupling circuits, one starter and one keep-alive/primer cathode, Miniature 7-pin base
GTR75M – 70 to 80 V, 2 to 22 mA Voltage-regulator tube with a priming anode, Miniature 7-pin base
GTR83W (50 to 250 µA), GTR83X (0.5 to 2.5 mA) – 82 to 86 V Subminiature voltage-regulator tube with a priming anode, all-glass 3 wire-ends
GTR95M/S – 90 to 100 V, 2 to 10 mA Voltage-regulator tube with a priming anode, Miniature 7-pin base
GTR120A/S – 115 to 135 V, 10 to 75 mA Voltage-regulator tube with a priming anode, A4A European 4-pin base
GTR120W – 9 mA Subminiature DC trigger triode for computer applications, all-glass with 3 wire-ends
GTR150M/S – 145 to 160 V, 2 to 20 mA Voltage-regulator tube with a priming anode, Miniature 7-pin base
GTR150W – 145 to 150 V, 0.5 to 2 mA Voltage-regulator tube with a priming anode, all-glass 3 wire-ends
VS10G = 6700/ET51 = Burroughs MO10, VS10G/M (With a magnetic shield) – 200 ns Decade Trochotron, 6.3 V/500 mA heater, B26A base
VS10H – High-current 250 ns Decade Trochotron, 6.3 V/550 mA heater, B26A base
VS10K – Low-voltage 500 ns Decade Trochotron, 6.3 V/500 mA heater, B26A base
VHT2 (2 V/100 mA filament), VHT2A (2 V/130 mA filament), VHT4 (Remote-cutoff, 4 V/1 A heater), VHTA (13 V/200 mA heater), VHTS (13 V/300 mA heater) – Heptode pentagrid converter, M7A British 7-pin base
CL40 and CL41 – Indirectly heated, linear light source (glow modulator tube), Mercury/Argon-filled gas diode, for rotating-drum FAX receivers, film soundtrack recording, etc., starter anode, Octal base
CL42 and CL43 – Indirectly heated, low-noise linear light source, Helium-filled gas diode with a starter anode, for film soundtrack recording, interferometers, etc., Octal base
CL44 – Indirectly heated, low-noise linear light source, Neon-filled gas diode with a starter anode, Octal base
CL50 and CL52 – Indirectly heated, linear light source, gas-filled diode with a starter anode, for rotating-drum FAX receivers, film soundtrack recording, etc., Miniature 7-pin base
CL55 – Indirectly heated, spectrally pure light source, Helium-filled gas diode with a starter anode, Miniature 7-pin base with anode on top cap
CL56 – Indirectly heated, spectrally pure light source, Krypton-filled gas diode with a starter anode, Miniature 7-pin base with anode on top cap
CL57 – Indirectly heated, spectrally pure light source, Neon-filled gas diode with a starter anode, Miniature 7-pin base with anode on top cap
CL58 – Indirectly heated, spectrally pure light source, Xenon-filled gas diode with a starter anode, Miniature 7-pin base with anode on top cap
CL61 – CL60 with a blue P-type Phosphor with 5 µs decay time and 16 kCd light output
CL62 – CL60 with an UVQ-type Phosphor with 100 ns decay time and 240 Cd light output
CL63 – CL60 with a yellow-green C-type Phosphor with 6 µs decay time and 24 kCd light output
CL64 – CL60 with a yellow V-type Phosphor with 5 µs decay time and 12 kCd light output
CL65 – CL60 with a red R-type Phosphor with 2 µs decay time and 14 kCd light output
CL66 – CL60 with a white T-type Phosphor with 5 µs decay time and 12 kCd light output
EN10 – Neostron, 400 Apeak Gas-filled, cold-cathode, pulsed arc-discharge tetrode thyratron used as a relay or as a reddish 700 Cdstroboscope lamp, differential trigger electrodes, Octal base
EN15 – 80 Aavg Cold-cathode, pulsed arc-discharge, Neon tetrode thyratron used as a stroboscope lamp, differential trigger electrodes, Noval base
EN30 – 250 Apeak Gas-filled, cold-cathode, pulsed arc-discharge tetrode thyratron used as a relay or as a stroboscope lamp, differential trigger electrodes, Miniature 7-pin base with anode cap
EN40 – 250 Apeak Gas-filled, cold-cathode tetrode thyratron used as a whitish stroboscope lamp with a high actinism for photographic film, differential trigger electrodes, Octal base
EN55 (single), EDN10 (dual) – Xenon-filled, pulsed arc-discharge cold-cathode tetrode thyratron used as a white 140 kCd stroboscope lamp, external (capacitive) trigger, 12-pin base
EN60 – Gas-filled, pulsed arc-discharge cold-cathode tetrode thyratron used as a white 900 klm@10µF@800V stroboscope lamp, external (capacitive) trigger, Edison screw lamp base with anode cap
GE10 – 500 V, 650 µA Directly heated, thermally-limited (=saturated) emission diode used as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, 1.8 V/330 mAmax uncoated Tungsten filament, two shorted pins that can be used to disable the circuit if the tube is removed from its socket
GN10 – 550 V, 250 Apeak, 90 mAavg Cold-cathode, pulsed arc-discharge tetrode thyratron, two starters, Octal base with anode on top cap
GRD7 – Educational, directly heated, thermally-limited (=saturated) emission diode, uncoated Tungsten filament, guard rings to ensure a homogeneous anode/cathode field; similar to the General Electric FP400
MT1, MT2, MT4, MT6 – Power triodes used in transmitters, joint 1919 EdiSwan+Marconi+Osram venture
MT7A, MT7B – 12 kV, 600 W Radiation-cooled power triodes with a Molybdenum anode, 15 V/10 A filament[53]
R – Directly heated triode used by many amateurs in the 1920s, 4 V/700 mA filament, A4A European 4-pin base; derived from the French Grammont TM tube[578][1]
B30 – Dual Class-B power triode, 13 V/300 mA heater, M7A British 7-pin base
B36 (13 V/300 mA heater), B65 (6.3 V/600 mA heater) – Dual AF triode, μ = 20, 300 V anode, Octal base
B309 = 12AT7/ECC81 – Dual high-μ triode used as amplifier/mixer in VHF circuits, μ = 55, 300 V anode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
B319 – Dual RF triode, μ = 24, 250 V anode, 7.4 V/300 mA heater, Noval base
B329 = 12AU7/ECC82 – Dual medium-μ triode, μ = 17, 250 V anode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
B339 = 12AX7/ECC83 – Dual high-μ AF triode, μ = 100, 250 V anode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
B719 = 6AQ8/ECC85 – Dual VHF triode used as amplifier/mixer in FM receivers, μ = 58, 300 V anode, 6.3 V/435 mA heater, Noval base
D41 = EdiSwan V914 – Dual diode, 4 V/300 mA heater, O5A European 5-pin base
D42 – Single diode, 4 V/600 mA heater, A4A European 4-pin base
D63 = 6H6-G – Separate-cathode dual diode, 6.3 V/300 mA heater, Octal base
D77 = 6AL5/EAA91/EB91 – Separate-cathode dual diode, 6.3 V/300 mA heater, Miniature 7-pin base
DG2 – Dual-grid triode used as mixer (technically a tetrode), 80 V anode, 2 V/200 mA filament, O5A European 5-pin base
DH – High-μ AF triode, 16 V/250 mADC heater, O5A European 5-pin base
DH30 – Dual diode + triode, 13 V/300 mA heater, M7A British 7-pin base with control grid on top cap
DH63 – Dual diode + AF triode, 6.3 V/300 mA heater, Octal base
DH77 = 6AT6/EBC90 – Common cathode dual diode + high-μ AF triode used in FM ratio detectors, triode μ = 70, 6.3 V/300 mA heater, Miniature 7-pin base
DH107 – Common cathode dual diode + high-μ AF triode, triode μ = 70, 19 V/100 mA heater, Miniature 7-pin base
DH719 = 6AK8/EABC80 – Triple diode + triode, triode μ = 70, 6.3 V/450 mA heater, Noval base
DHD – Dual diode + high-μ triode, 16 V/250 mADC heater, M7A British 7-pin base
DL – Low-μ triode, 16 V/250 mADC heater, O5A European 5-pin base
DN41 – Dual diode + power pentode, 4 V/2.1 A heater, M7A British 7-pin base
DPT – Power pentode, 16 V/250 mADC heater, available in O5A European 5-pin or M7A British 7-pin base
DS – RF/IF Tetrode, 16 V/250 mADC heater, O5A European 5-pin base
H2 = Cossor 210RC – High-μ AF triode, μ = 35, 150 V anode, 2 V/100 mA filament, A4A European 4-pin base
H11, H12 – Miniature high-μ AF triodes used in hearing aids, 2 V/60 mA filament; similar to KC50, KC51, Mullard DA1
H30 – Dual diode + high-μ AF triode, μ = 80, 250 V anode, 13 V/300 mA heater, M7A British 7-pin base with control grid on top cap
H42 – Dual diode + high-μ AF triode, μ = 100, 250 V anode, 4 V/600 mA heater, M7A British 7-pin base with control grid on top cap
H63 = 6F5 – High-μ AF triode, 6.3 V/300 mA heater, Octal base
H410 (4 V/100 mA filament), H610 (6.0 V/100 mA filament) – High-μ AF triode, μ = 40, 150 V anode, A4A European 4-pin base
HA1 (4 V/250 mA heater), HA2 (6.3 V/150 mA heater) – 600 MHz Acorn triodes
HD22 – Dual diode + AF triode, 2 V/200 mA filament, μ = 27, 150 V anode, O5A European 5-pin base
HD23 – Dual diode + triode, 2 V/150 mA filament, μ = 28, 150 V anode, O5A European 5-pin base
HL2 – High-μ AF triode, 2 V/100 mA filament, μ = 27, 150 V anode, A4A European 4-pin base
HL210 = Cossor 210HF (2 V/100 mA filament, μ = 40), HL410 = Telefunken RE034 (4 V/100 mA filament, μ = 2.5), HL610 (6.0 V/100 mA filament, μ = 30) – High-μ AF triode, 150 V anode, A4A European 4-pin base
KTW21 – Remote-cutoff RF/IF beam tetrode, 2 V/100 mA filament, A4A European 4-pin base with control grid on top cap; upgraded drop-in replacement for the older W21 pentode
KTW61, KTW62 – Remote-cutoff RF/IF beam tetrode, 6.3 V/300 mA heater, Octal base with control grid on top cap; upgraded drop-in replacement for the older W61 pentode
KTW61M – KTW61 with a metal particles spray-shielded envelope
KTW63 – Remote-cutoff RF/IF beam tetrode, 6.3 V/300 mA heater, Octal base with control grid on top cap; upgraded drop-in replacement for the older W63 pentode
KTW73, KTW73M (Spray-shielded) – Remote-cutoff RF/IF beam tetrode, 6.3 V/160 mA heater, Octal base with control grid on top cap
KTZ41 – Sharp-cutoff RF/IF beam tetrode, 4 V/1.5 A heater, M7A British 7-pin base with control grid on top cap
KTZ61 – Sharp-cutoff RF/IF beam tetrode, 6.3 V/300 mA heater, Octal base with control grid on top cap
KTZ63 – Sharp-cutoff RF/IF beam tetrode, 6.3 V/300 mA heater, Octal base with control grid on top cap; upgraded drop-in replacement for the older Z63 pentode; beam variant of 6J7-G/EF37 with suppressor plates tied to cathode, not to a separate pin
KTZ73, KTZ73M (Spray-shielded) – Sharp-cutoff RF/IF beam tetrode, 6.3 V/160 mA heater, Octal base with control grid on top cap
L2B – Low-μ AF triode, μ = 15.5, 150 V anode, 2 V/100 mA filament, A4A European 4-pin base
L11, L12 – Miniature AF power triodes used in hearing aids, 2 V/60 mA filament; similar to KD50, Mullard DA2, DA3
L21 – Low-μ AF triode, 2 V/100 mA filament, A4A European 4-pin base
L30 – Low-μ AF triode, μ = 12, 200 V anode, 13 V/300 mA heater, M7A British 7-pin base
L63 = 6J5-G – Low-μ triode, 6.3 V/300 mA heater, Octal base
L77 = 6C4/EC90 – Low-μ triode, μ = 17, 6.3 V/150 mA heater, Miniature 7-pin base
L410 = Mullard PM4X = Philips B406 (4 V/100 mA filament), L610 (6.0 V/100 mA filament) – AF Power triode, 50-150 V anode, μ = 15, A4A European 4-pin base
LN309 = PCL83 – Low-μ AF triode + AF power pentode, 12.6 V/300 mA heater, Noval base
LP2 – AF Power triode, 150 V anode, μ = 15, 2 V/200 mA filament, A4A European 4-pin base
LS5A – AF Power triode, 400 V anode, μ = 2.5, 4.25-5.25 V/800 mA filament, A4A European 4-pin base
LS6A – AF Power triode, 400 V anode, μ = 3, 6.0 V/2 A filament, A4A European 4-pin base
LZ319 = 9A8/PCF80 – VHF Triode/pentode oscillator/mixer, Noval base
MH4 = CdL DW4011 = Cossor 41MHF = LaRadiotechnique TE24 = Telefunken REN904 = Valvo A4110 = CV399 – AF Triode, μ = 40, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
MH40 – Microphone preamplifier triode, 4 V/1 A heater, O5A European 5-pin base
MH41 = Cossor 41MH – AF Triode, μ = 80, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
MHD4 = Hivac ACDDT – Dual diode + triode, μ = 40, 250 V anode, 4 V/1 A heater, M7A British 7-pin base
MHL4 – AF Triode, μ = 20, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
MKT4 – 3.2 W AF Beam power tetrode, 4 V/1 A heater, available in O5A European 5-pin or M7A British 7-pin base
ML4 – AF Triode, μ = 12, 250 V anode, 4 V/1 A heater, O5A European 5-pin base
MPT4 – AF Power pentode, μ = 100, 250 V anode, 4 V/1 A heater, available in O5A European 5-pin or M7A British 7-pin base
MS4 (μ = 550), MS4B (μ = 1120) – Sharp-cutoff RF/IF tetrode, 4 V/1 A heater, O5A European 5-pin base with anode on top terminal
MSP4 (100 V screen grid), MSP41 (240 V screen grid) – RF/AF Pentode, 4 V/1 A heater, M7A British 7-pin base
MU12 = EdiSwan UU4 (350 V), MU14 = UU5 = Mullard IW4-500 (500 V) – Full-wave rectifier, 4 V/2.5 A heater, A4A European 4-pin base
MX40 = Brimar 15A2 = Cossor 41MPG = Ferranti VHT4 – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 4 V/1 A heater, M7A British 7-pin base; similar to the Mullard FC4 octode
N17 = 3S4/DL92 – Power pentode
N18 = 3Q4/DL95 – Power pentode
N19 = 3V4/DL94 = EdiSwan 1P11 – Power pentode
N30, N30G – Catkin AF Power pentode, 13 V/300 mA heater, M7A British 7-pin base
N31 – AF Power pentode, 26 V/300 mA heater, M7A British 7-pin base
N37 – AF Power pentode, 13 V/300 mA heater, Miniature 7-pin base
N40 – First commercially available beam power tetrode, 4 V/1.3 A heater, O5A European 5-pin base[579]
N41 = KT41 – Power pentode, 4 V/2 A heater, M7A British 7-pin base
N42 – Power pentode, 4 V/1 A heater, M7A British 7-pin base
N43 – Power pentode, 4 V/2 A heater, M7A British 7-pin base
N77 = 6AM5/EL91, N78 = 6BJ5 – Power pentodes, 6.3 V/200 mA heater, Miniature 7-pin base
N108 – Power pentode, 40 V/100 mA heater, Miniature 7-pin base
N309 = 15A6/PL83 – Power pentode used as CRT cathode driver, 15 V/300 mA heater, Noval base
N329 = 16A5/PL82 – Power pentode used as CRT vertical deflection or AF amplifier, 16.5 V/300 mA heater, Noval base
N339 – Horizontal deflection power pentode, 20 V/300 mA heater, Noval base
N709 = 6BQ5/EL84 – AF Power pentode, 6.3 V/760 mA heater, Noval base
N727 = 6AQ5/EL90 – Beam power pentode, 6.3 V/450 mA heater, Miniature 7-pin base
P2 – AF Power triode, 150 V anode, μ = 7.5, 2 V/200 mA filament, A4A European 4-pin base
P240 – AF Power triode, 150 V anode, μ = 4, 2 V/400 mA filament, A4A European 4-pin base
P410 = Philips B409 = Telefunken RE134 = Valvo L414 (4 V/100 mA filament), P415 (4 V/150 mA filament), P425 = Mullard PM254 = Philips B405 (4 V/250 mA filament) – AF Power triode, μ = 7.5, 150 V anode, A4A European 4-pin base
P610 (6.0 V/100 mA filament, 150 V anode, μ = 8), P625 (6.0 V/250 mA filament, 250 V anode, μ = 6), P625A (200 V anode) – AF Power triodes, A4A European 4-pin base
PT2 – AF Power pentode, 2 V/200 mA filament, O5A European 5-pin base
PT4 – AF Power pentode, μ = 40, 200 V anode, 4 V/1 A filament, O5A European 5-pin base
PT15 – RF Power pentode, 6.3 V/1.3 A filament, O5A European 5-pin base with anode on top cap
PT25H – 25 W AF Power pentode, 400 V anode, 4 V/2 A filament, O5A European 5-pin base
PT240 = KT24 – AF Power pentode, 2 V/200 mA filament, O5A European 5-pin base
PT425 (4 V/250 mA filament), PT625 (6 V/250 mA filament) – AF Power pentode, O5A European 5-pin base
PX4 – 12 W Directly AC-heated AF power triode, μ = 5, 4 V/1 A filament, A4A European 4-pin base
PX25, PX25A – 25 W Directly AC-heated AF power triode, μ = 9.5, 4 V/2 A filament, A4A European 4-pin base
S12 – Miniature AF tetrode used in hearing aids, 2 V/60 mA filament; similar to KE50, Mullard DAS1
S21 (μ = 220, 2 V/100 mA filament), S22 = Philips B262 (μ = 350, 2 V/200 mA filament) – Sharp-cutoff tetrodes, 150 V anode, A4A European 4-pin base and top terminal
S23, S24 – Sharp-cutoff tetrodes, 150 V anode, 2 V/100 mA filament, A4A European 4-pin base with anode on top terminal
S410 (4 V/100 mA filament), S610 (6.0 V/100 mA filament) – Sharp-cutoff RF tetrode, A4A European 4-pin base
U10 = Telefunken RGN1054 = Mullard DW2X = EdiSwan D380B = Tungsram PV495 – Full-wave rectifier, A4A European 4-pin base
U12 – Full-wave rectifier, A4A European 4-pin base
U14 – Full-wave rectifier, A4A European 4-pin base
U16 – CRT EHT rectifier, A4A European 4-pin base
U17 – Half-wave rectifier, A4A European 4-pin base
U18/20 – Full-wave rectifier, A4A European 4-pin base
U19 – Half-wave rectifier, A4A European 4-pin base
U31 – Half-wave rectifier, Octal base
U37 – CRT EHT rectifier, wire-ends
U41 = 1B3-GT/1G3-GT/DY30 – CRT EHT rectifier, Octal base
U43 – CRT EHT rectifier, wire-ends
U45 – CRT EHT rectifier, wire-ends
U50 = 5Y3-G – Full-wave rectifier, Octal base
U52 = 5AS4A/5U4-GB – Full-wave rectifier, Octal base
U54 = GZ37 – Full-wave rectifier, Octal base
U78 = 6X4/EZ90 – Full-wave rectifier, Miniature 7-pin base
U107 – Half-wave rectifier, Miniature 7-pin base
U309 – CRT horizontal deflection output booster/damper/efficiency diode for analog color TV receivers, Noval base
U319 – Half-wave rectifier, Noval base
U329 – CRT horizontal deflection output booster/damper/efficiency diode for analog color TV receivers, Noval base
U709 = 6CA4/EZ81 – Full-wave rectifier, Noval base
VDS – Remote-cutoff tetrode, 16 V/250 mADC heater, O5A European 5-pin base with anode on top terminal
VMP4G – Remote-cutoff pentode, 4 V/1 A heater, M7A British 7-pin base with anode on top cap
VMS4 = Philips E445 = Telefunken RENS1214 = Valvo H4125D (semiremote-cutoff), VMS4B (remote-cutoff) – RF/IF Tetrode, 4 V/1 A heater, O5A European 5-pin base with anode on top cap
VP21 – Remote-cutoff pentode, 2 V/100 mA filament, M7A British 7-pin base with anode on top cap
VS24, VS24K (smaller envelope) – Remote-cutoff RF tetrode, 2 V/150 mA filament, A4A European 4-pin base with anode on top cap
W17 = 1T4/DF91 = EdiSwan 1F3 – Remote-cutoff RF/IF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
W21 – Remote-cutoff RF/IF tetrode, 2 V/100 mA filament, A4A European 4-pin base with control grid on top cap
W30 – Catkin Remote-cutoff RF/IF tetrode, 13 V/300 mA heater, M7A British 7-pin base with anode on top cap
W31 = Ferranti VPTS – Remote-cutoff RF/IF pentode, 13 V/300 mA heater, M7A British 7-pin base with anode on top cap
W42 – Remote-cutoff RF/IF pentode, 4 V/600 mA heater, M7A British 7-pin base with control grid on top cap
W77 = 6CQ6/EF92 = Brimar 9D6 – Remote-cutoff RF/IF pentode, 6.3 V/200 mA heater, Miniature 7-pin base
W107 – Remote-cutoff RF/IF pentode, 12.6 V/100 mA heater, Miniature 7-pin base
W727 = 6BA6/EF93 – Remote-cutoff RF pentode, 6.3 V/300 mA heater, Miniature 7-pin base
X18 = 1AC6/DK92 – Heptode pentagrid converter, 1.4 V/50 mA filament, Miniature 7-pin base
X21 – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 2 V/100 mA filament, M7A British 7-pin base
X22 – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 2 V/150 mA filament, 7-pin base
X23 – Triode/hexode oscillator/mixer, 2 V/300 mA filament, M7A British 7-pin base with hexode control grid #1 on top cap
X30, X32 (Low hum) – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 13 V/300 mA heater, M7A British 7-pin base
X31 – Remote-cutoff triode/hexode oscillator/mixer, 13 V/300 mA heater, M7A British 7-pin base with hexode control grid #1 on top cap
X41 = Brimar 20A1 = Cossor 41STH = EdiSwan AC/TH1 = Mullard TH4A – 60 MHz Triode/hexode oscillator/mixer, 4 V/1.2 A heater, M7A British 7-pin base; upgraded drop-in replacement for the older MX40 pentagrid converter
X41C – X41 with a ceramic base for better frequency stability in VHF Band I analog TV tuners
X42 – Remote-cutoff heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 4 V/600 mA heater, M7A British 7-pin base
X61 = 6J8-G, X61M (Spray-shielded) – Triode/heptode oscillator/mixer, 6.3 V/300 mA heater, Octal base
X63 = 6A8-G/PH4 – Remote-cutoff heptode pentagrid converter, 6.3 V/300 mA heater, Octal base
X64 = 6L7-G – Mixing heptode requiring a separate oscillator, 6.3 V/300 mA heater, Octal base
X65 – Remote-cutoff triode/hexode oscillator/mixer, 6.3 V/300 mA heater, Octal base with hexode control grid #1 on top cap
X79 = 6AE8 – Remote-cutoff triode/hexode oscillator/mixer, 6.3 V/300 mA heater, Noval base
X109 – Remote-cutoff triode/hexode oscillator/mixer, 19 V/100 mA heater, Noval base
X719 = 6AJ8/ECH81 – Remote-cutoff triode/heptode oscillator/mixer, 6.3 V/300 mA heater, Noval base
X727 = 6BE6/EK90 – Pentagrid converter with American grid topology, 6.3 V/300 mA heater, Miniature 7-pin base
Z21 – Sharp-cutoff RF/IF tetrode, 2 V/100 mA filament, M7A British 7-pin base with anode on top cap
Z77 = 6AM6/EF91 – Sharp-cutoff RF pentode, 6.3 V/300 mA heater, Miniature 7-pin base
Z319 = EEV E2133 (6351) – Secondary emission, sharp-cutoff wideband pentode, 6.3 V/300 mA heater, Noval base
Z359 (12.6 V/300 mA heater between pins 4, 5), Z759 (6.3 V/600 mA heater between pins 5, 6) – Sharp-cutoff video pentodes, 6.3 V/300 mA heater, Noval base
Z719 = 6BX6/EF80 – Sharp-cutoff RF pentode, 6.3 V/300 mA heater, Noval base
Z729 = 6BK8/6CF8/EF86 – Sharp-cutoff, low-noise AF pentode, 6.3 V/200 mA heater, Noval base
ZA1 (4 V heater), ZA2 (6.3 V heater) – Acorn sharp-cutoff pentodes
ZD17 = 1S5/DAF91 = EdiSwan 1FD9 – Diode + AF pentode, 1.4 V/50 mA filament, Miniature 7-pin base
A537 – Microphone preamplifier triode, 4 V/400 mA heater, British side-contact 4 base with control grid on top cap
A577 – Triode used as cathode follower rectifier in vacuum tube RF voltmeters, 4 V/1 A heater, O5A European 5-pin base with control grid on top cap, use as AF amplifier not recommended
A1714 (CV408) – Planar UHF triode, 6.3 V/490 mA heater, Miniature 7-pin base; similar to 9002
A1834 = 6AS7-G/ECC230 (CV2523) – Dual power triode used as series-pass regulator in stabilized DC power supplies, 6.3 V/2.5 A heater, Octal base
GT1C = AN1 – Argon-filled, 500 V, 300 mAavg, 500 mARMS, 1 Apeak variant extensively used in the Colossus computer
GU20 (8.75 kV, 4 A, superseded by GU20/21), GU21 = EnglishElectricValve AH221 = Mullard RG4-1250 (11 kV, 4.75 A) – Half-wave Mercury-vapor rectifier, E40 GoliathEdison screw lamp base
KT2 – 1 W Beam power tetrode, 2 V/200 mA filament, O5A European 5-pin base
KT21 – 1.25 W Beam power tetrode, 2 V/300 mA filament, O5A European 5-pin base
KT32 – 7.5 W Beam power tetrode used in AC/DC radio receivers with series heater strings, 26 V/300 mA heater, Octal base; drop-in replacement for the 25L6-G, 25W6-GT
KT33 (25A6-GT) – 5 W Beam power tetrode used in AC/DC radio receivers with series heater strings, 26 V/300 mA heater, Octal base
KT33C – KT33 with a center-tapped heater, so it can also be wired for 13 V/600 mA
KT36 – 10 W Beam power tetrode used in AC/DC radio receivers with series heater strings, 26 V/300 mA heater, Octal base
KT41 – 8.6 W Beam power tetrode, 4 V/2 A heater, M7A British 7-pin base
KT55 – 25 W Beam power tetrode used in AC/DC radio receivers with series heater strings, 52 V/300 mA heater, Octal base
KT61 (6M6-G, EL33) – 4.3 W Beam power tetrode, 6.3 V/950 mA heater, Octal base
KT63 – 6 W Beam power tetrode, 6.3 V/700 mA heater, Octal base; drop-in replacement for the 6F6 power pentode
KT66 – 7.25 W Beam power tetrode, 6.3 V/1.27 A heater, Octal base; drop-in replacement for the 6L6-GC
KT67 – 25 W RF beam power tetrode, 6.3 V/1.5 A heater, B9G 9-pin Loctal base
KT71 (50L6-GT) – 5 W Beam power tetrode used in AC/DC radio receivers with series heater strings, 48 V/160 mA heater, Octal base
KT77 – 30 W Beam power tetrode, 6.3 V/1.4 A heater, Octal base; drop-in replacement for the 6CA7/EL34 power pentode
KT81 – KT61 with a B8G Loctal base
KT88 = 6550A = CV5220 (EdiSwan 12E13, Brimar 7D11) – AF beam power tetrode, two tubes are capable of providing 100 W output, Class-AB1, 6.3 V/1.6 A heater, Octal base
QP21 – Dual AF power pentode, 2 V/400 mA filament, M7A British 7-pin base
TT10 (813 = QY2-100) – 100 W, 30 MHz Beam power tetrode, 10 V/5 A filament, special 7-pin base with anode on top cap
TT11 – 2.7 W, 100 MHz Beam power tetrode, 6.3 V/800 mA heater, Octal base with anode on top cap
TT12 – 2.7 W, 20 MHz Beam power tetrode, 19 V/420 mA heater, B9G 9-pin Loctal base with anode on top cap
TT15 – 15 W, 160 MHz Beam power tetrode, 6.3 V/1.6 A heater, B9G 9-pin Loctal base
TT16D = QY3-125 – 125 W, 120 MHz Beam power tetrode, 5 V/6.5 A filament, B5F Giant 5-pin UY base with anode on top cap
TT20 = QQE03/20 (2B52, QQV03-20) – 2×10 W, 200 MHz Dual beam power tetrode, center-tapped 12.6 V/650 mA resp. 6.3 V/1.3 A heater, Septar base with anodes on top pins
TT21 = 7623 (6.3 V/1.6 A heater), TT22 = 7624 (12.6 V/800 mA heater) – 37.5 W, 30 MHz Beam power tetrode, Octal base with anode on top cap; derived from KT88
TT24 – 10 W, 225 MHz Dual beam power tetrode, center-tapped 6.3 V/830 mA heater, Noval base
TT100 – 100 W, 20 MHz beam power tetrode, center-tapped 12.6 V/1.6 A resp. 6.3 V/3.2 A heater, 12-pin base with anode on top cap
Early, directly heated Mullard tubes were mostly assigned PM ("Philips-Mullard"),[587] followed by a number containing the filament voltage[2]
PM1, PM1A = Cossor 210RC – AF Triode for use in RC-coupled amplifiers, 2 V/100 mA filament, A4A European 4-pin base
PM1HF = Cossor 210HF – RF/IF Triode, 2 V/100 mA filament, A4A European 4-pin base
PM1HL = Cossor 210HL = Dario TB282 = Tungsram HR210 – RF/AF Triode, 2 V/100 mA filament, A4A European 4-pin base
PM1LF = Cossor 210LF = Dario TB102 – AF Triode, 2 V/100 mA filament, A4A European 4-pin base
PM2, PM2A – Power triode for Class-A amplifiers, 2 V/200 mA filament, A4A European 4-pin base
PM2B, PM2BA – Power triode for Class-B amplifiers, 2 V/200 mA filament, M7A British 7-pin base
PM2DX = Dario TB172 – AF Triode, 2 V/100 mA filament, A4A European 4-pin base
PM4 – Power triode, 4 V/100 mA filament, A4A European 4-pin base
PM6 – Power triode, 6 V/100 mA filament, A4A European 4-pin base
PM12 (Sharp-cutoff), PM12V (remote-cutoff) – Tetrode, 2 V/150 mA filament, A4A European 4-pin base
PM16 – Sharp-cutoff tetrode, 6 V/75 mA filament, A4A European 4-pin base
PM22, PM22A, PM22C – "Super Power" pentode, 2 V/300 mA filament, A4A European 4-pin or O5A European 5-pin base
PM24A (4 VAC/275 mA filament), PM24B (4 VAC/1 A filament), PM24C (4 VAC/1 A filament), PM24D (4 VAC/2 A filament) – Directly AC-heated power pentode, O5A European 5-pin base
PM202 – "Super Power" triode, 2 V/200 mA filament, A4A European 4-pin base
PM252 – "Super Power" triode, 2 V/400 mA filament, A4A European 4-pin base
PM254 = M-OV/GEC P425 – "Super Power" triode, 4 V/200 mA filament, A4A European 4-pin base
PM256 – "Super Power" triode, 6 V/250 mA filament, A4A European 4-pin base
Many later tubes were assigned acronyms with up to three letters, followed by a number containing the heater voltage. This was phased out after 1934 when Mullard adopted the Mullard–Philips scheme
2D4 = AB1 – Dual Diode, 4 V/650 mA heater, O5A European 5-pin base with one anode on top cap
2D13, 2D13A (V5A Side-contact 5 base), 2D13C (O5A European 5-pin base) – Dual Diode, 13 V/200 mA heater, one anode on top cap
DA1 (2 V/50 mA filament), DB1 (1.5 V/70 mA filament) – Miniature AF triodes used in Deaf Aids; similar to DC51, KC50, KC51, M-OV/GEC H11, H12
DA2 (2 V/50 mA filament), DA3 (2 V/55 mA filament), DB3 (1.5 V/70 mA filament) – Miniature AF power triodes used in hearing aids; similar to DD51, KD50, M-OV/GEC L11, L12
DAS1 (2 V/60 mA filament), DBS1 (1.5 V/70 mA filament) – Miniature AF tetrodes used in hearing aids; similar to DF51, KE50, M-OV/GEC S12
FC4 – Octode Frequency Converter, 4 V/650 mA heater, M7A British 7-pin base with #4 grid on top cap; similar to the M-OV/GEC MX40 heptode[588]
FC13 – FC4 with a 13 V/200 mA heater and a P8A side-contact 8 base
FC13C – FC13 with a M7A British 7-pin base; similar to Brimar 15D1, Cossor 13PGA, Ferranti VHTA heptodes
GT4A (4 V/1.2 A heater), GT4C (EC50 with a 4 V/2.4 A heater) – Gas Triodes, negative control characteristic, P8A Side-contact 8 base with grid on top cap
HL13 (P8A Side-contact 8 base), HL13C (M7A British 7-pin base) – Triode, 13 V/200 mA heater, grid on top cap
HVR1 (2 V/290 mA filament), HVR2 (4 V/650 mA filament) – Half-wave, High-Voltage Rectifier, A4A European 4-pin base with anode on top cap
PenA4 (4 V/1.95 A heater, M7A British 7-pin base), Pen4VA (4 V/1.35 A heater, O5A European 5-pin base with screen grid on a side terminal), Pen4VB (slow-heating PenA4) – Power Pentodes
Pen20 – Power Pentode, 20 V/180 mA heater, B6H European 6-pin base
Pen26 – Power Pentode, 24 V/200 mA heater, P8A side-contact 8 base with control grid on top cap
Pen36C – Power Pentode, 33 V/200 mA heater, M7A British 7-pin base
Pen40DD – Power Pentode + dual Diode, 44 V/200 mA heater, M7A British 7-pin base with control grid on top cap
SP13 – (Screen grid) RF Pentode, 13 V/200 mA heater, P8A side-contact 8 base with control grid on top cap
T4D – Subminiature Television Diode, 4 V/200 mA heater, all-glass wire-ended
TDD4 = Brimar 11A2 = Cossor DDT = EdiSwan AC/HLDD = M-OV/GEC MHD4 (4 V/550 mA heater), TDD13C (13 V/200 mA heater) – Triode + dual Diode, M7A British 7-pin base with grid on top cap
TH4, TH4A (4 V/1 A heater), TH13C (13 V/310 mA heater), TH21C (21 V/200 mA heater), TH22C, TH30C (29 V/200 mA heater) – Triode/Hexode oscillator/mixer, M7A British 7-pin base with #1 Hexode grid on top cap
TP4 = EdiSwan AC/TP – Triode + Pentode, 4 V/1.25 A heater, B9H British 9-pin base with the pentode control grid on top cap
TSE4 – Television Secondary Emission pentode, 4 V/1.1 A heater, M7A British 7-pin base with control grid on top cap
TSP4 – Television high-Slope Pentode, 4 V/1.3 A heater, M7A British 7-pin base with control grid on top cap
VP2 = EdiSwan VP215 = M-OV/GEC VP21 – Vari-μ Pentode, 2 V/180 mA heater, M7A British 7-pin base
VP13A (P8A Side-contact 8 base), VP13C (M7A British 7-pin base) – Vari-μ Pentode, 13 V/200 mA heater, control grid on top cap
1D5 – Half-wave rectifier; 25Z4-G with a 40 V/200 mA heater and an O5A European 5-pin base; not to be confused with the RETMA 1D5 remote-cutoff pentode
1D6 – Half-wave rectifier; 25Z4-G with a U6A American 6-pin base
4D1 – Triode, 13 V/200 mA heater, M7A British 7-pin base
7A2 – Power pentode, 4 V/1.2 A heater, M7A British 7-pin base
7A3 = Cossor 42MP/PEN = EdiSwan AC2/PEN = Ferranti PT4 = Mullard PEN4VB – Power pentode, 4 V/2 A heater, M7A British 7-pin base
7D3 – Power pentode, 40 V/200 mA heater, M7A British 7-pin base
7D6 – Power pentode, 40 V/200 mA heater, M7A British 7-pin base
7D8 – Power pentode, 13 V/650 mA heater, M7A British 7-pin base
7D10 = 6CH6/EL821 – Power pentode, 6.3 V/750 mA heater, Noval base
8A1 = Cossor MS/PEN = EdiSwan AC/S2PEN = Ferranti SPT4 = M-OV/GEC MSP4 – Sharp-cutoff pentode, 4 V/1 A heater, O5A European 5-pin base
8D2 – Sharp-cutoff pentode, 13 V/200 mA heater, M7A British 7-pin base
8D3 = 6AM6/EF91 – Sharp-cutoff pentode, 6.3 V/300 mA heater, Miniature 7-pin base
8D5 = 6BR7, 8D8 – Low-hum, low-microphonics, sharp-cutoff pentodes, 6.3 V/150 mA heater, Noval base
9A1 = Cossor MVS/PEN = EdiSwan AC/VP1 = Ferranti VPT4 = M-OV/GEC VMP4 = Mullard VP4 – Remote-cutoff RF/IF pentode, 4 V/1 A heater, O5A European 5-pin base with anode on top cap
9D2 – Remote-cutoff RF/IF pentode, 13 V/200 mA heater, M7A British 7-pin base with grid on top cap
9D6 – Remote-cutoff RF/IF pentode, 6.3 V/200 mA heater, Miniature 7-pin base
9D7 – Remote-cutoff RF/IF pentode, 6.3 V/300 mA heater, Noval base
10D1 – Common cathode dual diode, 13 V/200 mA heater, O5A European 5-pin base
11A2 = Cossor DDT = EdiSwan AC/HLDD = M-OV/GEC MHD4 = Mullard TDD4 – Common cathode dual diode + triode, 4 V/1 A heater, M7A British 7-pin base
11D3 – Common cathode dual diode + triode, 13 V/200 mA heater, M7A British 7-pin base
11D5 – Common cathode dual diode + triode, 13 V/150 mA heater, M7A British 7-pin base
13D1 = 25SN7-GT, 13D2 = 6SN7-GT – Separate cathodes, dual triodes, Octal base
13D3 (CV2212) – Separate cathodes, dual triode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
13D7 = ECC807 – Separate cathodes, dual triode, 6.3 V/300 mA heater, Noval base
13D8 (12AU7/ECC82) – Separate cathodes, dual AF triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
13D9 – Separate cathodes, dual triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
15A2 = Cossor 41MPG = Ferranti VHT4 = M-OV/GEC MX40 (4 V/650 mA heater), 15D1 (13 V/200 mA heater), 15D2 (13 V/150 mA heater) – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, M7A British 7-pin base
20A1 – Triode/heptode oscillator/mixer, 4 V/1.2 A heater, M7A British 7-pin base
20D2 – Triode/hexode oscillator/mixer, 13 V/150 mA heater, M7A British 7-pin base
20D4 – Triode/heptode oscillator/mixer, 6.3 V/300 mA heater, Noval base
3J-187E (Glass/metal), 3JC-187E (ceramic/metal) – Forced-air cooled power triode
3RM-215G – 8 kW, 10 MHz Water/helix-cooled Neotron, used as RF power amplifier or oscillator; similar to YD1352S/8867
4G/280K = 2D21/EN91 – 650 V, 100 mAavg, 500 mApeak, 10 Asurge Indirectly heated Xenon tetrode thyratron, negative control characteristic, used as relay driver or grid-controlled rectifier, Miniature 7-pin base
22V/310A – 1.4 kV, 250 mA Full-wave Mercury-vapor rectifier
G10/241E – Nomotron, a unidirectional Dekatron with multi-alloy cathodes
G75/2D = 0A3 = M-OV/GEC QS75/40 – 75 V, 5 to 40 mA Voltage-regulator tube, Octal base
P535-1E = WE 715B (15 kV), P552-1E = 5D21 (20 kV) – Pulse-rated power tetrodes used in hard-tube pulser radar modulators
4011B – 30 W Power triode, 8 V/1.6 A filament, 4-pin Bayonet base
4015A = STC 3D/150G – 1.5 kW Power triode, 11 V/41 A filament, cable connections
4016A, 4016B (grid on opposite side) – 400 W, 33 MHz Power triode, 14 V/18 A filament, base and lateral stud connections
4019A (4-pin Bayonet base), 4019B (European 4-pin base) – 290 mW Power triode, 4 V/250 mA filament
4020A (4-pin Bayonet base), 4020B (European 4-pin base), 4020C (European 4-pin base with grid on top cap) – Triode, 2 V/250 mA filament
4021A/B/C – 250 mW Power triode, 4 V/250 mA filament
4022A/AR/B – 160 mW Power triode, 4 V/250 mA filament
4033A (European 5-pin base), 4033AF (qualified for use in standard aircraft radio), 4033B (UY5 base), 4033L = STC 3B/252B – 25 W, 2 MHz Power triode, 6 V/1.4 A heater
4043A/C (3B/351A, UX4 base), 4043B/D (3B/351B, European 4-pin base) – 35 W, 2 MHz Power triode, 7.5 V/1.2 A filament, versions C and D with reduced grid emission
4056A/B (STC 3B/352A) – 35 W Power triode, 6 V/1.9 A filament, 4-pin base
4060A – 200 W, 10 MHz Power triode, 12.5 V/6 A filament
4062A – 75 W, 15 MHz Power triode, 12 V/1.85 A filament, 4-pin base
4074A = STC 33A/138A – 2×5 W, 100 MHz Dual power triode, 6.3 V/800 mA heater, C7H European 7-pin base with anodes on top caps
4094A = STC 3B/851A – 85 W, 6 MHz Power triode, 10 V/3.25 A filament, 4-pin base
4097A – 35 W, 2 MHz Power triode, 6 V/1.1 A filament, 4-pin base
4101D/E/G (Western Electric 101D/F/J/L/M) – 285 mW Power triode, 4.5 V/1 A filament, 4-pin Bayonet base
4102D/E/G (WE 102D/E/F/G/L) – Triode, 2 V/970 mA filament, 4-pin Bayonet base
4104D/E/G (WE 104D) – 300 mW Power triode, 4.4 V/970 mA filament, 4-pin Bayonet base
The SY4307A made by STC Australia is historically notable because a pair of them in parallel Class-C was used as the output amplifier in a transmitter built in secret by Australian soldiers in Japanese-occupied Portuguese Timor during World War II in 1942. This transmitter, now reconstructed and on display at the Australian War Memorial in Canberra, was called "Winnie the War Winner".[589]
1AF33 = 1AH5/DAF96 (1.4 V/25 mA filament), 1AF34 (1.2 V/30 mA filament) – Diode + AF pentode, Miniature 7-pin base
1F33 = 1AJ4/DF96 (1.4 V/25 mA filament), 1F34 (1.2 V/30 mA filament) – Remote-cutoff RF/IF pentode, Miniature 7-pin base
1H33 = 1R5-SF = 1AQ5 (=1R5/DK91 with a 1.4 V/25 mA filament), 1H34 (1.2 V/30 mA filament) – Heptode pentagrid converter with American grid topology, anode voltage in the 45...90 volt range, Miniature 7-pin base
1H35 = 1AB6/DK96 – Heptode pentagrid converter with suppressor (#5) grid internally tied to the positive 1.4 V/25 mA filament end, Miniature 7-pin base
Ideezet Tubes named after their designer Hanso Idzerda:
PH-IDZ = A – Directly heated triode, 4 V/500 mA filament, 2× E14 Edison screw or B15d + B15s Bayonet candelabra lamp bases on the ends, both Argon-filled and high-vacuum version available at the time
B – Directly heated triode, 2 V/500 mA filament, 2× E14 base, both Argon-filled and high-vacuum version available
B2 – Directly heated triode, 1.7 V/150 mA filament, A4A 4-pin base
BⅥ = B6 – Directly heated space charge grid tetrode, 1.7 V/150 mA filament, A4A 4-pin base with side contact; superseded by A241
C – Directly heated triode, 4 V/500 mA filament, 2× E14 base, both Argon-filled (CⅠ) and high-vacuum (CⅡ) version available
DⅠ = D1 (Gas-filled), DⅡ = D2 (High-vacuum) – Directly heated triode used in 1920s TRF and regenerative radios, 3.5 V/500 mA filament, A4A 4-pin base
DⅢ = D3 – DⅡ with a 3.0 V/500 mA filament, designed as an equivalent to the Telefunken RE11
DⅣ = D4 (Gas-filled), DⅤ = D5 (High-vacuum) – Directly heated triode, 3.5 V/500 mA filament, short-pin UV-style base for use in American equipment
E – Directly heated triode, 4 V/700 mA filament, A4A European 4-pin base; derived from the French Grammont TM tube
F = ZⅠ – Directly heated power triode, 3.8 V/1.4 A filament; derived from the E tube
Q = DⅥ = D6 – Directly heated space charge grid tetrode, 3.5 V/500 mA filament, A4A 4-pin base with side contact
A106 – AF Triode, μ = 6, 20-100 V anode, 1.0-1.3 V/60 mA filament, A4A European 4-pin (default) base
A109 – RF/AF Triode, μ = 9, 20-120 V anode, 1.0-1.3 V/60 mA filament, A4A European 4-pin (default) base
A141 – RF/AF Space charge grid tetrode, μ = 4.5, 2-20 V anode, 1.0-1.3 V/60 mA filament, A4A European 4-pin base with the space charge grid on a lateral terminal (default)
A241 – RF/AF Space charge grid tetrode, μ = 4.5, 2-20 V anode, 1.7-2.0 V/60 mA filament, A4A European 4-pin base with the space charge grid on a lateral terminal (default)
A306 – AF Triode, μ = 6, 20-100 V anode, 2.7-3.3 V/60 mA filament, A4A European 4-pin (default) base
A310 – RF/AF Triode, μ = 10, 20-100 V anode, 2.7-3.3 V/60 mA filament, A4A European 4-pin (default) base
A341 – RF/AF Space charge grid tetrode, μ = 4.5, 2-20 V anode, 2.7-3.3 V/60 mA filament, A4A European 4-pin base with the space charge grid on a lateral terminal (default)
A406 – AF Triode, μ = 6, 20-100 V anode, 3.4-4.0 V/60 mA filament, A4A European 4-pin (default) base
A409 = Mullard PM3X – AF Triode, μ = 9, 20-150 V anode, 4 V/60 mA filament, A4A European 4-pin (default) base
A410 – RF/AF Triode, μ = 10, 20-100 V anode, 3.4-4.0 V/60 mA filament, A4A European 4-pin (default) base
A415 – AF Triode, μ = 15, 50-150 V anode, 4 V/80 mA filament, A4A European 4-pin (default) base
A425 = Mullard PM3DX = Telefunken RE034 = Tungsram HR406 – RF Triode, μ = 25, 50-150 V anode, 4 V/60 mA filament, A4A European 4-pin (default) base
A430 (AF), A435 (RF) – Triode, μ = 35, 50-150 V anode on top terminal, 4 V/60 mA filament, A4A European 4-pin (default) base
A441 (2-20 V anode), A441N (2-100 V anode) – Space charge grid tetrode, μ = 4.5, 4 V/80 mA filament, A4A European 4-pin base with the space charge grid on a lateral terminal (default)
A442 = Telefunken RES094 = Tungsram S406 – Screen grid tetrode, gm = 700 µS, μ = 150, 50-150 V anode on top terminal, 4 V/60 mA filament, A4A European 4-pin base
B105 – AF Power triode, μ = 5, 20-120 V anode, 1.0-1.3 V/150 mA filament, A4A European 4-pin (default) base
B217 – Triode, μ = 17, 150 V anode, 2 V/100 mA filament, A4A European 4-pin base
B228 = Cossor 210RC = M/OV H210 – Triode, μ = 28, 150 V anode, 2 V/100 mA filament, A4A European 4-pin base
B240 = Telefunken RE402B – Dual AF power triode, output power 1.3 W, 120 V anode, 2 V/200 mA filament, C7H European 7-pin base
B255 = Ferranti S2 = LaRadiotechnique TB452 – Remote-cutoff, screen grid tetrode, gm ≤ 1.2 mS, μ ≤ 400, 150 V anode, 2 V/180 mA filament, A4A European 4-pin base and top terminal
B262 = M-OV/GEC S22 – Screen grid tetrode, gm = 1.3 mS, μ = 500, 150 V anode, 2 V/180 mA filament, A4A European 4-pin base and top terminal
B403 – AF Power triode, μ = 3, 50-150 V anode, 4 V/150 mA filament, A4A European 4-pin base
B405 – AF Power triode, μ = 5, 50-150 V anode, 4 V/150 mA filament, A4A European 4-pin base
B406 = Mullard PM4X = M-OV/GEC L410 – AF Power triode, μ = 6, 50-150 V anode, 4 V/100 mA filament, A4A European 4-pin base
B409 = LaRadiotechnique TB09 = M-OV/GEC P410 = Telefunken RE134 = Tungsram L414/L415 = Valvo L413 – AF Power triode, μ = 9, 250 V anode, 4 V/150 mA filament, A4A European 4-pin base
B424 = Mullard PM3D – AF Power triode, μ = 24, 200 V anode, 4 V/100 mA filament, A4A European 4-pin base
B438 = Valvo W410 – AF Power triode, μ = 38, 200 V anode, 4 V/100 mA filament, A4A European 4-pin base
B442 = CdL DZ2 = LaRadiotechnique TB42=R81 = Valvo H410D – Screen grid tetrode, gm = 900 µS, μ = 350, 200 V anode, 4 V/100 mA filament, A4A European 4-pin base and top terminal
B443 = CdL DX3 = Cossor 415PT = LaRadiotechnique B443O = M-OV/GEC 425PT = Tungsram PP415 – Power pentode, gm = 1.3 mS, μ = 100, 50-150 V anode, 4 V/150 mA filament, A4A European 4-pin base
B443S = Telefunken RES164 = Tungsram PP416 – Power pentode, gm = 1.4 mS, μ = 70, 200 V anode, 4 V/150 mA filament, O5A European 5-pin base
B543 – Power pentode, gm = 1.3 mS, μ = 60, 200 V anode, 5 V/100 mA filament, O5A European 5-pin base
B2006 = LaRadiotechnique CT06 = Telefunken REN1822 = Tungsram P2018 = Valvo L2218 – Power triode, μ = 6, 200 V anode, 20 V/180 mADC series heater, O5A European 5-pin base
B2038 = Telefunken REN1821 = Tungsram R2018 = Valvo A2118 – Triode, μ = 33, 200 V anode, O5A European 5-pin base; E438 with a 20 V/180 mADC series heater
B2041 = Telefunken REN1817D = Tungsram DG2018 = Valvo U1718D – Dual-grid triode for use as mixer (technically a tetrode), 100 V anode, 20 V/180 mADC series heater, O5A European 5-pin base with one grid on a lateral screw terminal
B2042 = Telefunken RENS1820 = Valvo H2018D – Sharp-cutoff RF/IF screen grid tetrode, gm = 1 mS, μ = 400, 100 V anode on top terminal, 20 V/180 mADC series heater, O5A European 5-pin base
B2043 = Telefunken RENS1823D = Tungsram PP2018D = Valvo L2318D – Power pentode, gm = 1.7 mS, μ = 70, 200 V anode, 20 V/180 mADC series heater, O5A European 5-pin base with the screen grid on a lateral screw terminal
B2044 = LaRadiotechnique CT44 = Mullard SD20 = Telefunken RENS1854 = Tungsram DS2218 = Valvo AN2127 – Diode + tetrode, gm = 2.8 mS, μ = 700, 200 V anode on top terminal, B6H European 6-pin base; E444 with a 20 V/180 mADC series heater
B2044S = Telefunken REN1826 – Diode + AF triode, μ = 30, 200 V anode, 20 V/180 mADC series heater, O5A European 5-pin base with diode on top terminal
B2045 = Telefunken RENS1819 – Remote-cutoff RF/IF screen grid tetrode, gm ≤ 1 mS, μ ≤ 400, 200 V anode on top terminal, 20 V/180 mADC series heater, O5A European 5-pin base
B2046 = Telefunken RENS1884 = Tungsram HP2018 = Valvo H2518D – RF/IF Pentode, gm = 2.2 mS, μ = 5000, 200 V anode on top terminal, 20 V/180 mADC series heater, O5A European 5-pin base
B2047 = Telefunken RENS1894 = Mullard VP20 = Tungsram HP2118 = Valvo H2618D – Remote-cutoff RF/IF pentode, gm ≤ 2 mS, μ ≤ 2000, 200 V anode on top terminal, 20 V/180 mADC series heater, O5A European 5-pin base
B2048 = Telefunken RENS1824 = Tungsram MH2018 = Valvo X2818 – Sharp-cutoff hexode mixer, 200 V anode, 20 V/180 mADC series heater, C7H European 7-pin base
B2049 = Telefunken RENS1834 = Valvo X2918 – Remote-cutoff hexode mixer, 200 V anode, 20 V/180 mADC series heater, C7H European 7-pin base
B2052T = Mullard SG20 = Telefunken RENS1818 = Valvo H1818D – Sharp-cutoff RF/IF tetrode, 250 V anode on top terminal, 20 V/180 mADC series heater, O5A European 5-pin base
B2099 = Telefunken REN1814 – AF Triode, μ = 99, 200 V anode, 20 V/180 mADC series heater, O5A European 5-pin base
C142 = Valvo H125D – Screen grid tetrode, gm = 1 mS, μ = 150, 50-150 V anode on top terminal, 1 V/250 mA filament, A4A European 4-pin base
C243N – Power pentode, gm = 2.4 mS, μ = 100, 150 V anode, 2 V/200 mA filament, O5A European 5-pin base
C405 = Tungsram P430 – Directly AC-heated AF power triode, μ = 5, 250 V anode, 4 V/300 mA filament, A4A European 4-pin base
C443 = LaRadiotechnique TC43 = Telefunken RES364 = Tungsram PP430 = Valvo L425D – Directly AC-heated power pentode, gm = 1.7 mS, μ = 60, 300 V anode, 4 V/250 mA filament, A4A European 4-pin base with lateral screw terminal; optionally O5A European 5-pin base
C443N = Mullard PM24DC = Telefunken RES374 = Tungsram PP431 = Valvo L427D – Directly AC-heated power pentode, gm = 1.4 mS, μ = 50, 300 V anode, 4 V/250 mA filament, O5A European 5-pin base
C443N (Serie 250) – μ = 32
C453 – Slightly changed or only renamed C443
C509 = American 01-A – AF Power triode, μ = 9, 20-120 V anode, 4.5-5.3 V/250 mA filament, American UX4 4-pin base for use in imported radios with a rheostat filament supply for a 3-cell lead-acid battery; optionally A4A European 4-pin base
D143 = Valvo L160D – Power pentode, gm = 1.8 mS, μ = 100, 50-150 V anode, 1 V/650 mA filament, A4A European 4-pin base
D404 = Mullard AC044X = Telefunken RE604 = Tungsram P460 = Valvo LK460 – Directly AC-heated AF power triode, μ = 3.5, 250 V anode, 4 V/650 mA filament, A4A European 4-pin base
E406 – Directly AC-heated AF power triode, μ = 6, 150-250 V anode, 4 V/1 A filament, A4A European 4-pin base
E408 – Directly AC-heated AF/modulator power triode, μ = 8, 200-400 V anode, 4 V/900 mA filament, A4A European 4-pin base
E408N = Telefunken RE614 – Directly AC-heated AF Power triode, μ = 8, 400 V anode, 4 V/1 A filament, A4A European 4-pin base
E409 = LaRadiotechnique TE09 = Valvo L4100 – AF Power triode, μ = 9, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
E414 – AF Triode, μ = 14, 200 V anode, 4 V/1 A heater, A4A European 4-pin base
E415 = Telefunken REN804 = Valvo A4100/H4100 – AF Triode, μ = 15, 50-150 V anode, 4 V/900 mA heater, A4A European 4-pin base
E424 = LaRadiotechnique TE24 – AF Triode, μ = 24, 200 V anode, 4 V/1 A heater, O5A European 5-pin base; optionally A4A European 4-pin base with lateral screw terminal
E424N = E428 = LaRadiotechnique TE24N = Telefunken REN904 = Tungsram AG495 – AF Triode, μ = 28, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
E430 – AF Triode, μ = 30, 50-150 V anode, 4 V/1 A heater, O5A European 5-pin base; optionally A4A European 4-pin base with lateral screw terminal
E435 – AF Triode, μ = 35, 50-150 V anode, 4 V/900 mA heater, O5A European 5-pin base; optionally A4A European 4-pin base with lateral screw terminal
E438 = Telefunken REN1004 = Valvo W4080/W4100 – Triode, μ = 38, 200 V anode, O5A European 5-pin base; B2038 with a 4 V/1 A heater
E441 = CdL DW1 = Tungsram DG4101 = Valvo U4100D, E441N = Telefunken REN704D – Dual-grid triode used as mixer (technically a tetrode), 100 V anode, 4 V/900 mA heater, O5A European 5-pin base with grid #1 on a lateral screw terminal
E442 = Valvo H4100D – RF/IF Screen grid tetrode, gm = 900 µS, μ = 700, 150-200 V anode, 4 V/900 mA heater, O5A European 5-pin base and top terminal
E442S = Cossor 41MSG = Telefunken RENS1204 = Valvo H4080D – RF/IF Screen grid tetrode, gm = 1 mS, μ = 400, 200 V anode, 4 V/1 A heater, O5A European 5-pin base and top terminal
E443 – Power pentode, gm = 1.8 mS, μ = 60, 300-400 V anode, 4 V/900 mA filament, O5A European 5-pin base
E443H = LaRadiotechnique TE43H = Telefunken RES964 = Tungsram PP4101 = Valvo L496D = Fivre RTP4 – Power pentode, gm = 3 mS, μ = 130, 250 V anode, 4 V/1.1 A filament, O5A European 5-pin base
E443N = LaRadiotechnique TE43N = Tungsram PP4100 = Valvo L491D – Power pentode, gm = 1.9 mS, μ = 75, 400 V anode, 4 V/900 mA filament, O5A European 5-pin base
E444 = LaRadiotechnique TE44/TE444 = Telefunken RENS1254 = Tungsram DS4100 = Valvo AN4126 – Diode + tetrode, B6H European 6-pin base; B2044 with a 4 V/1.1 A heater
E444S = LaRadiotechnique TE44S = Telefunken REN924 = Valvo AN4092 – Diode + AF triode, μ = 30, 4 V/1 A heater, O5A European 5-pin base
E445 = LaRadiotechnique TE45 = M-OV/GEC VMS4 = Mullard VM4V = Telefunken RENS1214 = Tungsram AS4104 = Valvo H4125D – Selektode, a remote-cutoff RF/IF screen grid tetrode, gm ≤ 1 mS, μ ≤ 300, 200 V anode, 4 V/1 A heater, O5A European 5-pin base and top terminal
E446 = Cossor MS/Pen = LaRadiotechnique TE46 = Mullard SP4 = Telefunken RENS1284 = Tungsram HP4100/HP4101 = Valvo H4128D – RF Pentode, gm = 2.5 mS, μ = 5000, 200 V anode, 4 V/1.1 A heater, O5A European 5-pin base and top terminal
E447 = LaRadiotechnique TE47 = M-OV/GEC VMP4 = Telefunken RENS1294 = Tungsram HP4106 = Valvo H4129D – Remote-cutoff RF pentode, gm ≤ 2 mS, μ ≤ 2000, 200 V anode, 4 V/1.1 A heater, O5A European 5-pin base and top terminal
E448 = LaRadiotechnique TE48 = Telefunken RENS1224 = Tungsram MH4100 = Valvo X4122 – Sharp-cutoff hexode mixer, 200 V anode, 4 V/1.2 A heater, C7H European 7-pin base and top cap
E449 = LaRadiotechnique TE49 = Telefunken RENS1234 = Tungsram FH4105 = Valvo X4123 – Remote-cutoff hexode mixer, 4 V/1.2 A heater, C7H European 7-pin base and top cap
E452T = LaRadiotechnique TE52 = Telefunken RENS1264 = Valvo H4111D – Screen grid tetrode, gm = 2 mS, μ = 900, 200 V anode, 4 V/1 A heater, O5A European 5-pin base and top terminal
E453 = LaRadiotechnique TE53/TE534 = Telefunken RENS1374D = Tungsram APP4100 = Valvo L4150D – Power pentode, gm = 2.5 mS, μ = 175, 250 V anode, 4 V/1.1 A heater, O5A European 5-pin base
E455 = LaRadiotechnique TE55 = Mullard MM4V = Telefunken RENS1274 = Valvo H4115D – Remote-cutoff RF pentode, gm ≤ 2 mS, μ ≤ 700, 200 V anode, 4 V/1 A heater, O5A European 5-pin base and top terminal
E462 = LaRadiotechnique TE424 = Tungsram AS495 – Sharp-cutoff RF pentode, gm = 2 mS, μ = 900, 200 V anode, 4 V/1 A heater, O5A European 5-pin base and top terminal
E463 = LaRadiotechnique TE63 = Mullard ME463 = Telefunken RENS1384 = Tungsram APP4130 = Valvo L4138D – Power pentode, gm = 2.7 mS, μ = 100, 250 V anode, 4 V/1.35 A heater, B6H European 6-pin base
E499 = Telefunken REN914 = Valvo W4110 – AF Triode, μ = 99, 200 V anode, 4 V/1 A heater, O5A European 5-pin base
F215 (Valvo A2200W) – Triode, μ = 15, 20-150 V anode, 2.5 V/1.5 A heater, A4A European 4-pin base with the cathode on a lateral terminal
F410 = Valvo LK4200 – Directly AC-heated power triode, μ = 10, 400-550 V anode, 4 V/2 A filament, A4A European 4-pin base
F443 = Valvo L495D – Directly AC-heated power pentode, gm = 3 mS, μ = 100, 550 V anode, 4 V/2 A filament, O5A European 5-pin base
F443N = Valvo L497D – Directly AC-heated power pentode, gm = 3.9 mS, μ = 80, 300 V anode, 4 V/2 A filament, O5A European 5-pin base
F704 – AF/Modulator power triode, μ = 3.8, 400-450 V anode, 7.5 V/1.25 A filament, A4A European 4-pin base or American UX4 base for use in imported devices
F708 (American 10 = CX-310 = UX-210) – Directly AC-heated AF/modulator power triode, μ = 8, 250-450 V anode, 7.5 V/1.25 A filament, A4A European 4-pin base
328 (1.3 A),[590]367 (6 A)[591] – Argon-filled Tungar bulb, a low-voltage, full-wave rectifier for charging 12-volts lead-acid batteries
329 – 1.15 A, Dual (5...15 and 10...30 V) ballast tube for use with the 328 full-wave Tungar bulb; not to be confused with the Western Electric 329A pentode
354 – 2 A Half-wave Argon-filled Tungar bulb for charging 8-volts lead-acid batteries;[592] not to be confused with the Western Electric 354A thyratron
451 – Full-wave, Argon-filled Tungar bulb, a low-voltage rectifier for charging 6-volts lead-acid batteries at 1.3 A;[593] not to be confused with the Western Electric 451A trigger triode
452 – 1.15 A, Dual (3.5...10 and 7...20 V) ballast tube for use with the 451 Tungar bulb[594]: 264
1063A – 3-Phase, half-wave, Argon/Mercury-vapor Tungar bulb, a low-voltage rectifier for charging 90-cell lead-acid batteries at 6 A per phase, 1.9 V/11 A filament
1069K – Forced-air cooled, full-wave Tungar bulb used in 60 A DC welding power supplies, 3.25 V/70 A filament
1533A – 3-Phase, half-wave, Argon/Mercury-vapor Tungar bulb, a low-voltage rectifier for charging 110-cell lead-acid batteries at 15 A per phase, 1.9 V/23 A filament
1543A – 3-Phase, half-wave, Argon/Mercury-vapor Tungar bulb, a low-voltage rectifier for charging 110-cell lead-acid batteries at 25 A per phase, 1.9 V/36 A filament
1553A – 3-Phase, half-wave, Argon/Mercury-vapor Tungar bulb, a low-voltage rectifier for charging 110-cell lead-acid batteries at 40 A per phase, 1.9 V/70 A filament
1561 = Telefunken RGN2004 – 1.4 kV, 2×80 mA Full-wave rectifier, 4 V/2 A filament; AZ2 with an A4A European 4-pin base
1805 = RGN1064 – 1.4 kV, 2×50 mA Full-wave rectifier, 4 V/1 A filament, A4A European 4-pin base
1927 (40 to 120 V filament for 110VDC mains), 1928 (80 to 240 V filament for 220VDC mains) – Barretters for use with 180mADC tube sets[9]
3520 – Early side-on, 3-stage photomultiplier, oxidated-Caesium-on-Silver photocathode, λmax=850 nm, side-contact 8 base
4060 – Directly heated Dual Plateelectrometer (filament sandwiched between grid and anode)[596] planar triode, grid current ≤10 fA, 3-pin base with grid on top cap
4065 – Directly heated electrometer triode for probe amplifiers, grid current ≤125 fA, all-glass with 5 wire-ends
4066 – Directly heated electrometer tetrode, #2 grid current ≤2.5 fA, all-glass with 5 wire-ends
4067 – Directly heated electrometer pentode used in pH meter probes, #1 grid current ≤25 pA, inline all-glass with 5 wire-ends
4068 – Directly heated electrometer pentode, #1 grid current ≤3 fA, all-glass with 5 wire-ends
4069 – Directly heated electrometer triode used in probe amplifiers, controlled logarithmic relationship between 3 pA...3 nA positive grid current and anode current, all-glass with 5 wire-ends
4357 – 85 to 100 V, 10 to 40 mA Neon-filled voltage-regulator tube, A4A European 4-pin base
4606 – Triode used as preamplifier in telephone equipment, 4.5 V/1 A filament, 4-pin Bayonet base
4607 – Triode used as preamplifier in telephone equipment, 2.1 V/1 A filament, 4-pin Bayonet base
4609 – Triode used as preamplifier in telephone equipment, 4.2 V/250 mA filament, 4-pin Bayonet base
4613 – Power triode, 4 V/1 A filament, A4A European 4-pin base
4614 – Power triode, 4 V/1 A heater, O5A European 5-pin base
4617 – Triode used as preamplifier in telephone equipment, 4 V/250 mA filament, 4-pin Bayonet base
4624 – Power triode, 7.2 V/1.1 A filament, A4A European 4-pin base
4630 – Triode used as preamplifier in telephone equipment, 4.2 V/250 mA filament, 4-pin Bayonet base
4631 – Triode used as preamplifier in telephone equipment, 2 V/250 mA filament, 4-pin Bayonet base
4641 – Power triode, 4 V/2.1 A filament, A4A European 4-pin base
4652/AX1 – 500 VPIV, 125 mA Gas-filled, full-wave rectifier, A4A European 4-pin base
4654/EL50 – 80 W Power pentode, side-contact 8 base with anode on top cap
4657 – Shielded AF triode, 4 V/1 A heater, O5A European 5-pin base
4662 – Neon-filled bar graph indicator, a glass tube with a short anode, a keep-alive/primer anode and a long wire cathode that glows partially, the glow length is proportional to the tube current; similar to GEC TuneOn, Cossor 3180, 3184, ИН-9
4671/E1C (6.3 V/150 mA heater), 4675 = Mullard AT4 (4 V/230 mA heater) – 300 MHz Acorn triode; similar to 955
4672/E1F (6.3 V/150 mA heater), 4676 = Mullard AP4 (4 V/235 mA heater) – 430 MHz Acorn Sharp-cutoff pentode; similar to 954
4674 – Acorn UHF diode, 6.3 V/150 mA heater; similar to 953
4683 – Power triode, 4 V/950 mA filament, side-contact 8 base
4686/AC50 – 3 mAavg, 300 mApeak, Argon triode thyratron used in relaxation oscillators up to 50 kHz, 4 V/600 mA heater, side-contact 8 base with grid on top cap
4687 – 85 to 100 V, 10 to 40 mA Neon-filled voltage-regulator tube, side-contact 8 base
4695/E2F – Acorn Remote-cutoff UHF pentode, 6.3 V/150 mA heater; similar to 956
4696/EE(P)1 – Single-ended secondary emission amplifier used as a wideband amplifier and phase inverter, side-contact 8 base with control grid on top cap
56006 – OmegatronMass spectrometer tube. An electron gun sends an electron beam through a cavity to an electron collector anode. The cavity contains the gas to be analyzed. The gas is ionized by the electron beam and a magnetic field parallel to the axis of the beam forces the gas ions into a helical path around the beam, the orbital angular velocity depending on the ion mass. An electrode inside the cavity floods it with an RF electric field perpendicular to the magnetic field, from a sweep generator. When the frequency matches an ion's angular velocity, that ion will resonate and spiral outward like in a cyclotron, eventually hitting an ion collector electrode and generating a current there, which is amplified and measured[597]
Philips used more freeform designations for thyratrons and ignitrons:
PL5 – 1.5 kV, 3.5 Aavg, 100 ApeakSendytron,(de) a Mercury-vapor thyratron with an auxiliary anode and capacitive ignition by an isolated control rod dipping into the cathode pool, for use in stroboscopes and telecines[598][599]
PL323 = PL3C23 = 3C23 – 1.25 kV, 1.5 Aavg, 6 Apeak Argon/Mercury-vapor triode thyratron, negative control characteristic, 2.5 V/7 A filament, UX4 base with anode on top cap
PL435 = PL4C35 = 4C35, PL522 = PL5C22 = 5C22 – Half-indirectly heated, Hydrogen triode thyratrons used in radar modulators, B4D Superjumbo base with anode on top cap
TM – High-vacuum triode for amplification and demodulation of radio signals, developed in 1914–15 by the French military telecommunications service Télégraphie Militaire and made by E.C.&A. Grammont(fr) and CdL(1888) since 1915.[600][601][602][603] It became the standard receiving and amplifying tube of the Entente countries during World War I, and the first mass-produced radio tube, gm=400 µS, Ri=25 kΩ, μ=10, bright-emitter 4 V/700 mA filament, A4A European 4-pin base, lifespan 100 hours - substandard (due to wartime raw materials supply problems) TM tubes lived even shorter and were marked with a cross; clones and/or derivatives of the TM were also mass-produced in the UK (M-OV R tube), the Netherlands (Philips E tube), the United States[citation needed], Russia (Р-5↦R-5 tube)(ru) and Japan (UF-101 tube).Its secondary use as light source had earned it its nickname Loupiote ("little lamp")
CSF and its subsidiary LaRadiotechnique Compelec (Coprim, Miniwatt-Dario and RTC brands) and the Belgian MBLE (Adzam brand)[611] mostly assigned the letter(s) R, RT or V followed by an up to 3-digit number to their tubes, until Radiotechnique was fully acquired by Philips in 1947 and adopted the Mullard–Philips scheme
R5 (3.8 V/700 mA filament), R14, R15, R24 (3-3.5 V/60 mA filament) – Miniature triodes, A4A European 4-pin base
R165 – Sharp-cutoff pentode, 18 V/105 mA heater, Noval base
R242P, R244 – Subminiature VHF triode used as an oscillator, 6.3 V/150 mA heater, all-glass round cross-section envelope, circular 5-pin/wire-ends base
OME1199E2 (27 cm ("10 in")),[612]: 216ff OME1269E21 (40 cm (16 in))[612]: 220ff – Penetron-type red-to-green limited-gamut CRT
TH5800 (High-temperature), TH5801 (low-temperature) – 80 W Caesium plasma thermionic converters, η = 15%[613]
TH8102E20 (24 cm (9 in)),[612]: 159ff TH8104E21 (54 cm (21 in))[612]: 165ff – Penetron-type red-to-green limited-gamut CRT
TH9503 – Scripticon, a character generatormonoscope for text mode video rendering in early computer monitors, with a square target having letters, digits and symbols patterned on it in an (optionally customer-supplied) 8×8 array. An electron beam selects and scans a character, both by appropriate magnetic deflection, and generates an analog video signal;[614] cf. 4560, CK1414, SC3093
MO44 – 2 tetrodes + 1 capacitor (oscillator/mixer), 35 V/180 mA series heater
WG33 – 2 triodes + 1 power tetrode + passive components (audion, AF preamp and power amp), 50 V/180 mA series heater, 9+3-pin base with three top caps
WG34 – 1 pentode + 1 power tetrode + passive components (audion, AF preamp and power amp), 50 V/180 mA series heater, 12-pin base
WG35 – 1 pentode + 1 diode + 1 power tetrode + passive components (detector, AF variable-gain preamp and power amp), 63 V/180 mA series heater, 12-pin base with a tetrode grid top cap
WG36 – 1 triode + 2 pentodes (mixer, oscillator and IF amp), 65 V/180 mA series heater, 12-pin base
WG37 – 1 tetrode + 2 pentodes + passive components (RF preamp, audion and AF power amp), 75 V/180 mA series heater, 12-pin base
BD21 (200 V, Noval base), BD22 (400 V, Noval base), BD23 (600 V, Noval base), BD31 (200 V, subminiature all-glass with 2 wire-ends), BD32 (400 V, subminiature), BD35 (475 V, subminiature) – 10 Apeak Pulsed arc-discharge tubes for use as switching element in a high voltage pulse generator such as an electric fence energizer
BR11 (1.4 kV), BR12 (2.5 kV) – 4 kApeak Pulsed arc-discharge thyratron, keep-alive/primer anode, UX4 Bayonet base with anode on top cap
GD135 – 135 V, 2 mA Subminiature, precision switching diode, all-glass with 2 wire-ends
GK11 – Touch button tube, an illuminated capacitance touch switch - a cold-cathode DC relay tube, external (capacitive) starter activated by touching, then the cathode glow is visible as an orange ring. all-glass with 2 wire-ends
GR15 (Z803U) – 15 mA DC Tetrode for voltage triggers, RC timers etc., one starter, Townsend anode plus Tritium (half-life: 12.32 years) keep-alive/primer, Noval base
GR16 (Z805U) – 20 mA AC/DC Triode for voltage triggers, RC timers etc., one starter, Tritium primed, EM shield, Noval base
GR17 (Z804U) – 15 mA AC Triode for voltage triggers, RC timers etc., one starter and an EM shield, Noval base
GR20 – GR15 with two starters and a lower min. cathode current
GR31 (Z806W, ZC1020) – 15 mA DC Tetrode, one starter, Townsend anode plus Tritium keep-alive/primer, Noval base
GR32 – 25 mA DC Pentode for voltage triggers, RC timers etc., one aux anode, one starter, keep-alive/primer anode, Noval base
GR33 – 5-25 mA DC Tetrode for voltage triggers, RC timers etc., one starter, keep-alive/primer anode, Noval base
GR41 – 4-10 mA Subminiature DC pentode for voltage triggers, RC timers etc., two starters, keep-alive/primer anode, all-glass with 5 wire-ends
GR43 – 1-5 mA Subminiature DC pentode, one starter, keep-alive/primer anode, all-glass with 4 wire-ends
GR44 (Z70W, ZC1010) – 12 mA Subminiature DC pentode, two starters, Townsend anode plus Tritium keep-alive/primer, all-glass with 5 wire-ends
GR46 – 12 mA Subminiature DC tetrode, one starter, keep-alive/primer anode, all-glass with 4 wire-ends
GS11 – See G11
GT21 – AC/DC Glow Thyratron, Glow-type keep-alive/primer anode, Noval base
US-6A8 = 6A8 – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 6.3 V/800 mA heater, Octal base
US-6F7-A = 6F7A – Triode + pentode, 6.3 V/300 mA heater, Octal base; Metal version of 6F7
US-6J7 = 6J7 – Dual-control, sharp-cutoff RF pentode, 6.3 V/300 mA heater, Octal base with control grid on top cap
US-6K7 = 6K7 – Dual-control, remote-cutoff RF pentode, 6.3 V/300 mA heater, Octal base with control grid on top cap
US-6L7-G = 6L7-G – Mixing heptode requiring a separate oscillator, 6.3 V/300 mA heater, Octal base
US-6305 – VHF Pentode, 6.3 V/300 mA heater
Ut-6L7-G – US-6L7-G with an U7A base
UV-102 – Triode, 2.0 V/750 mA filament, UV4 base
UX-10-A – Triode, 7.5 V/1.25 A filament, UX4 base
UX-12-A = 12-A = UX-112-A = CX-112-A – Medium-μ triode, 5 V/250 mA filament, UX4 base
UX-30 – Triode, 2 V/60 mA filament, UX4 base
UX-31-A – Triode, 2.0 V/130 mA filament, UX4 base
UX-32 = 32 = RCA-232 = CX-332 – Sharp-cutoff tetrode, 2 V/60 mA filament, UX4 base with control grid on top cap
UX-47-A (2.5 V/1.75 A filament), UX-47-C (5.0 V/500 mA filament) – Power pentode, UX4 base; similar to 47
UX-71-A = 71-A = UX-171-A = CX-371-A – Power triode, 5 V/250 mA filament, UX4 base
UX-99 = X99 = UX-199 – Low-μ triode, 3.3 V/60 mA filament, UX4 base
UX-109 (1.3 V/80 mA filament), UX-109-A (1.1 V/60 mA filament) – Triode, UX4 base
UX-110 – Power triode, 1.3 V/160 mA filament, UX4 base
UX-111, UX-111-B – Space charge grid tetrode, 1.3 V/80 mA filament, UX4 base
UX-167 – Sharp-cutoff RF pentode, 2 V/60 mA filament, UX4 base
UX-201-A = 01-A – General-purpose low-μ triode, 5 V/250 mA filament, UX4 base
UX-202-A – Power triode, 7.5 V/1.25 A filament, UX4 base
UX-226 = 26 = CX-326, UX-26-B – Medium-μ RF triode, 1.5 V/1.05 A filament, UX4 base
UX-6202 – RF Tetrode, 1.9 V/50 mA filament, UX4 base
UY-6A3-B – Power triode, 6.3 V/1.6 A filament, UY5 base; indirectly heated variant of 2A3
UY-10-H – Triode, 6.3 V/800 mA heater, UY5 base
UY-11-A – Pentode, 1.1 V/60 mA filament, UY5 base
UY-36-A – RF Tetrode, 6.3 V/300 mA heater, UY5 base
UY-37-A – Triode, 6.3 V/300 mA heater, UY5 base
UY-38-A – Power pentode, 6.3 V/300 mA heater, UY5 base
UY-39-A – RF Pentode, 6.3 V/300 mA heater, UY5 base
UY-45-H – Power triode, 6.3 V/800 mA heater, UY5 base; indirectly heated variant of 45
UY-46-C – Class-B tetrode, 2.5 V/500 mA filament, UY5 base
UY-47 = 47 = RCA-247 = C-347, UY-47-A (2.5 V/1.75 A filament), UY-47-B (2.5 V/500 mA filament) – 2.7 W Power pentode, UY5 base; 46 with a suppresser grid connected to a filament center-tap
UY-56-A – Triode, 2.5 V/800 mA heater, UY5 base
UY-57-S – Pentode, 2.5 V/1.0 A heater, UY5 base
UY-76-A – Triode, 6.3 V/300 mA heater, UY5 base
UY-133 (1.1 V/125 mA filament), UY-133-A (1.1 V/60 mA filament) – Power pentode, UY5 base
UY-169 – Power pentode, 2 V/120 mA filament, UY5 base
UY-224 = 24 = C-324, UY-224-A = 24-A = C-324A, UY-24-B – Sharp-cutoff tetrode, 2.5 V/1.75 A heater, UY5 base with control grid on top cap
UY-227 = 27 = C-327 (2.5 V/1.75 A heater), UY-27-A (2.5 V/1.5 A heater), UY-27-B (2.5 V/1.0 A heater) – Medium-μ triode, UY5 base
UY-233 = 33 = RCA-233 = C-333 – Power pentode, 2 V/260 mA filament, UY5 base
UY-235 = 35/51 = C-335, UY-35-B – Remote-cutoff RF tetrode, 2.5 V/1.75 A heater, UY5 base; variant of the UY-224-A tetrode
UY-247 = 47 = RCA-247 = C-347 – Power pentode, 2.5 V/1.75 A filament, UY5 base
UY-536 – Tetrode, 6.3 V/300 mA heater, UY5 base
UY-537 – Triode, 6.3 V/300 mA heater, UY5 base
UY-538 – Power pentode, 6.3 V/300 mA heater, UY5 base
UY-539 – RF Pentode, 6.3 V/300 mA heater, UY5 base
UY-807 = 807, UY-807-A (6.3 V/900 mA heater), UY-807-B (12.0 V/450 mA heater) – Transmitting beam power tetrode, UY5 base
UY-6301 – Triode, 6.3 V/600 mA heater, UY5 base
Uy-11-M – Tetrode, 1.1 V/60 mA filament, Peanut 5-pin base
Uy-14-M – RF Pentode, 1.1 V/60 mA filament, Peanut 5-pin base
UZ-12-C – Dual triode, 5.0 V/500 mA filament, U6A base; dual unit of 12A
UZ-30-C, UZ-30-MC – Dual triode, 2.0 V/120 mA filament, U6A base; dual unit of 30
UZ-31-MC – Dual power triode, 2.0 V/260 mA filament, U6A base; dual unit of 31
UZ-33-A – Dual triode, 2.0 V/260 mA filament, U6A base; dual unit of 33
UZ-42 = 42 – Power pentode, U6A base; 2A5 with a 6.3 V/700 mA heater
UZ-47-D (5.0 V/500 mA filament), UZ-47-G (5.0 V/250 mA filament), UZ-47-H (5.0 V/1.65 A filament), UZ-47-K (5.0 V/500 mA filament) – Modulator power pentode, U6A base
UZ-55 = 55 – Dual diode + medium-μ triode, 2.5 V/1 A heater, U6A base
UZ-57 = 57, UZ-57-A – Sharp-cutoff pentode, 2.5 V/800 mA heater, U6A base
UZ-58 = 58, UZ-58-A – Remote-cutoff RF/IF pentode, 2.5 V/1 A heater, U6A base
UZ-75 = 75 – 6H6-type Dual diode + 6F5-type high-μ triode, 6.3 V/300 mA heater, U6A base
UZ-77 = 77 – Sharp-cutoff pentode, 6.3 V/300 mA heater, U6A base
UZ-78 = 78 – Remote-cutoff pentode, 6.3 V/300 mA heater, U6A base
UZ-79 = 79 – Dual power triode, 6.3 V/600 mA heater, U6A base
UZ-89 = 89 – 3.4 W Power pentode, 6.3 V/400 mA heater, U6A base
UZ-109 – Dual triode, 1.1 V/100 mA filament, U6A base
UZ-130-C – Dual triode, 1.1 V/240 mA filament, U6A base
UZ-133-D – Triode + pentode, 1.1 V/125 mA filament, U6A base
UZ-135 – Heptode pentagrid converter, 1.1 V/130 mA filament , U6A base
UZ-1C6-B (1C6) – Heptode pentagrid converter with British grid topology and control (#4) grid on top cap, 2.0 V/120 mA filament, U6A base
UZ-2A5 = 2A5 – Power pentode, 2.5 V/1.75 A heater, U6A base
UZ-2A6 = 2A6 – Dual diode + high-μ triode, 2.5 V/800 mA heater, U6A base with control grid on top cap
UZ-6C6 = 6C6 – Dual-control, sharp-cutoff RF pentode, 6.3 V/300 mA heater, U6A base with control grid on top cap
UZ-6D6 = 6D6 – Dual-control, remote-cutoff RF pentode, 6.3 V/300 mA heater, U6A base with control grid on top cap
UZ-6E5 – See EZ-6E5
UZ-6L6-A (6L6-G) – Beam power tetrode, 6.3 V/900 mA heater, U6A base
UZ-6001 – Pentode, 6.3 V/300 mA heater, U6A base
UZ-6302 – Video pentode, 6.3 V/600 mA heater, U6A base
UZ-6304 – Power pentode, 6.3 V/700 mA heater, U6A base
Р-5 ⟼ R-5 – Triode derived from the Grammont TM with an anode voltage of up to 500...800 V, power output of up to 1 W in Class-C mode, but only 40 mW in Class-A mode[620]
6Н5С ⟼ 6N5S = 6AS7-G – Dual low-μ triode used as series-pass voltage regulator in stabilized DC power supplies
6Н6П ⟼ 6N6P – Dual low-μ AF triode
6Н7С ⟼ 6N7S = 6N7-GT – Common cathode dual RF power triode, 10 W in Class-B2
6Н8С ⟼ 6N8S (6SN7-GT, Shuguang 6N8P) – Separate cathodes, dual high-μ triode used as a flip-flop in early Soviet computers such as Урал-1 and Урал-2, Octal base[621]
6С33С ⟼ 6S33S – Power triode used as series-pass voltage regulator in stabilized DC power supplies, now used in audiophile gear, center-tapped 12.6 V/2.8-3.6 A resp. 6.3 V/5.6-7.2 A heater, Septar base
6С34А ⟼ 6S34A – Subminiature RF/AF triode
6С35А ⟼ 6S35A – Subminiature RF/AF triode
6С37Б ⟼ 6S37B – Subminiature AF/Pulse triode
6С40П ⟼ 6S40P – 20 kV Power triode used as EHV shunt regulator in analog color TV receivers
6С41С ⟼ 6S41S – Power triode used as series-pass voltage regulator in stabilized DC power supplies, Septar base
6МН1Б ⟼ 6MN1B – Mechanotron-type(ru) mechano-electronic displacement sensor, a vacuum dual triode with one anode mounted on a shaft that extends through a diaphragm;[71] cf. 5734
6МХ1Б ⟼ 6MH1B – Mechanotron-type displacement sensor, a vacuum dual diode with one anode mounted on a shaft that extends through a thin, flexible metal diaphragm, shaft movement is reflected in the anode currents difference[622]
6МХ1С ⟼ 6MH1S – Mechanotron-type displacement sensor, a vacuum dual diode with both anodes mounted on a shaft that extends through a diaphragm[623]
6МДХ4С ⟼ 6MDH4S – Mechanotron-type pressure sensor, a vacuum dual diode with one anode mounted on a bellows chamber that expands or contracts depending on external pressure[624]
6МУХ6П ⟼ 6MUH6P – Mechanotron-type rotation sensor, a vacuum dual diode with one anode mounted on a shaft that extends through a vacuum-tight bearing
13П1С ⟼ 13P1S (Shuguang 13P1P↤13П1П) – Low (26-110 V) anode voltage AF beam power tetrode used in vehicle equipment; cf. 28D7-W
ГК-11П ⟼ GK-11P – 120 kW, 30 MHz Water/vapor-cooled, ceramic/metal, directly heated, linear power tetrode
ГК-12А ⟼ GK-12A – 25 kW, 30 MHz Water-cooled, ceramic/metal, directly heated power triode with a magnetically-focused electron flux, used in dielectric heating equipment
ГК-71 ⟼ GK-71 – 125 W, 20 MHz Directly heated power pentode; replaced the 813
ЛФ-4 ⟼ LF-4 – Beam deflection function generator tube for use in analog computers
ЛФ-7 ⟼ LF-7 – Beam deflection function generator tube for use in analog computers[635]
ЛФ-8 ⟼ LF-8 – Beam deflection function generator tube for use in analog computers to calculate a hypotenuse as z = √x2+y2
ЛФ-9П ⟼ LF-9P – Polytron, a beam deflection function generator tube for use in analog computers[636] to integrate up to 10th order differential equations
ОГ-3 ⟼ OG-3 – Bidirectional decade Counter Dekatron up to 20 kHz, filled with a Helium/Hydrogen mixture, violet glow
ОГ-4 ⟼ OG-4 – Bidirectional decade Counter Dekatron up to 2 kHz, Neon-filled, orange-red glow
ОГ-5 ⟼ OG-5 – Upgraded ОГ-4, up to 10 kHz
ОГ-7 ⟼ OG-7 – Decade Counter Dekatron up to 50 kHz, Argon-filled, blue glow
ОГ-8 ⟼ OG-8 – Unidirectional decade Counter Dekatron up to 100 kHz, Argon-filled, blue glow
ОГ-9 ⟼ OG-9 – Unidirectional decade Counter Dekatron up to 2 kHz, Neon-filled, orange-red glow
ТГИ1-270/12 ⟼ TGI1-270/12 – 12 kV, 270 A Hydrogen thyratron
МТХ-90 ⟼ MTH-90 – Small, top-viewing, cold-cathode, Neon thyratron used as a latching indicator, top of envelope acts as a magnifier, all-glass wire-ended, comes with a blob of solder on the end of each wire for rapid installing, like today's ball grid arrays; similar to 7323, 7400, 7401, 7979, 395A
ЭПЛ-1 ⟼ EPL-1 – Electron bombarded semiconductor tube, a tube where the anode is replaced by a semiconductor diode that is reverse-biased and when hit by the electron beam, generates a current;[638] cf. 7610, XQ1200, XQ1340
ИГТ1-203Р, ИГТ2-203Р, ИГТ3-203Р ⟼ IGT1-203R (1-in-5 Major/minor graduation), IGT2-203R (flat graduation), IGT3-203R (1-in-10 arced graduation) – Neon-filled, planar, 203-segment linear glow-transferplasma bar graph displays with five cathode strings[640]
ИН-9 ⟼ IN-9 – Neon-filled bar graph indicator, a glass tube with a short anode and a long wire cathode that glows partially, the glow length is proportional to the tube current; similar to GEC TuneOn, Cossor 3180, 3184, Philips 4662
ИН-13 ⟼ IN-13 – ИН-9 with a starter cathode and a segmented indicating cathode[641]
ИН-33 ⟼ IN-33 – Neon-filled, planar, dual 105-segment linear glow-transfer plasma bar graph display used in VU meters etc., three cathode strings;[642] similar to Burroughs BG16101
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ИТМ2-М ⟼ ITM2-M – Four-color phosphored-thyratron latchingpixel, 4×4 array of 4 subminiature dual-starter luminescent thyratrons each for the colors red, yellow, green and blue (thus, 5 intensities per color yields 54 = 625 colors), 4×4 matrix of 10-volts sensitive starter electrodes, cubic envelope for easy stacking in both axes, 12-pin all-glass wire-ended,[643] similar to today's RGBA LEDs
ИТС1 ⟼ ITS1 – Green phosphored-thyratron latching seven-segment display, no decimal point, 5-volts sensitive starter electrodes, all-glass wire-ended, rectangular envelope for easy stacking in both axes[644]
1222 (6L6-GA) – AF Beam power tetrode, 6.3 V/900 mA heater, Octal base
1225 (6L7) – Remote-cutoff heptode pentagrid converter with American grid topology, 6.3 V/300 mA heater, Octal base
1229 – Electrometer tetrode, 900 mV/35 mA filament, UX4 base, control grid on top cap
1230 – Electrometer triode, 2 V/60 mA filament, UX4 base
1231 – Sharp-cutoff pentode, 6.3 V/450 mA heater, Loctal base, used as video amplifier
1232 = 7G7 – Dual-control, sharp-cutoff pentode, 6.3 V/450 mA heater, Loctal base
1236A, 1236C – Thermally-limited emission diode, 1.9 V/450 mA filament, Loctal base, usable as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits
1237 – Gas-filled, full-wave rectifier, 2.5 V/3 A filament, Octal base
1238 – Dual low (28-100 V) anode voltage AF beam power pentode, 28 V/400 mA heater, Loctal base
1247 – Subminiature detector diode for use in probes, 700 mV/65 mA filament, anode on top wire
1252 = 6U8A/6KD8 – VHF Triode/pentode oscillator/mixer, 6.3 V/450 mA heater, Noval base
Note: For the Western Electric 300-series see above
322 (Machlett Labs) – 800 VPIV, 15 W, 1500 MHz Oil can-type disk-seal UHF clipper power diode, 6.3 V/950 mA filament;[650] not to be confused with the Western Electric 322A power pentode
356 (Machlett Labs) (880, 5771, 7085) – 22.5 kW, 25 MHz Water-cooled power triode, 7.5 V/170 A filament;[652] not to be confused with the Western Electric 356A power triode
Note: For the Cossor 400-series see above; for the Western Electric 400-series see above
400 (General Electric) – 100 V, 25 mA Half-wave rectifier, 4 V/2.25 A filament, UX4 base, designed for studies of emission and the influence of magnetic fields[653]
411 (General Electric) – 150 kV (in oil) resp. 100 kV (in air), 300 mApeak Half-wave rectifier, 10 V/14.5 A filament, 4-pin base;[654] not to be confused with the Western Electric 411A trigger triode
441 (General Electric) – High-vacuum, side-on, S4 phototube, UX4 base;[655] not to be confused with the Western Electric 441A triode
446A (General Electric, RCA) – Early Lighthouse UHF triode, 10 dB noise figure at 1 GHz;[656] superseded by 2C40; not to be confused with the Western Electric 446A voltage-regulator tube
6P10 – Ultra high reliability pentode used in short-haul submarine communications cable repeaters, 6.3 V/300 mA heater, dual Octal base;[258] derived from the EdiSwan SP61
6P12 – Ultra high reliability pentode used in long-haul submarine communications cable repeaters, 6.3 V/250 mA heater, single Octal base;[258] derived from the 6P10
Note: For the Western Electric 700-series see above
710 = 6011 – 1.5 kV, 2.5 A Gas/Mercury-vapor triode thyratron, negative control characteristic;[657][412]: 179 not to be confused with the Western Electric 710A Micropup
714 (National Electronics, RCA) = 7021 – 1.25 kV, 1 A Argon/Mercury-vapor triode thyratron, negative control characteristic, UX4 Bayonet base with anode on top cap[658]
716 (RCA) = 6855 – 1.25 kV, 1 A Gas/Mercury-vapor triode thyratron, negative control characteristic;[659] not to be confused with the Western Electric 716A thyratron
740L = 7022 – 1.5 kV, 4 A Argon/Mercury-vapor triode thyratron, negative control characteristic, Lug connectors and anode on top cap
760 = 6858 (B4D Superjumbo base), 760L = 7023 (Lugs) – 1.5 kV, 6.4 A Gas/Mercury-vapor triode thyratron with anode on top cap, negative control characteristic
782 – Sterilamp, an early inert-gas/Mercury-vapor germicidal lamp[660] used e.g. inside hospital air ducts
CH1027 – Curristor – Four types of Nitrogen-filled, radioactive constant-current tubes with a current plateau from 25 to 500 V, all-glass wire-ended, active material is 226Ra with a half-life of 1601 years, for linear capacitor charging and draining in missile and ordnance mine timing circuits, instrumentation biasing, as current reference, etc.:
SC2795, SC3863 (3 in (7.6 cm)), SC3144, SC3154 (9 in (23 cm)) – CRTs with an unphosphored front glass but with fine wires embedded in it, used as electrostatic print heads. The wires would pass the electron beam current through the glass onto a sheet of paper where the desired content was therefore deposited as an electrical charge pattern. The paper was then passed near a pool of liquid ink with the opposite charge. The charged areas of the paper attract the ink and thus form the image; cf. CK1366, CK1367, CK1368, CK1369
SC3304 (3"), SC3507, SC3800, SC3876 (10 in (250 mm)), SC3850 (5 in (13 cm)) – CRTs with a fiberoptic faceplate used as B/W photoprinter heads, P11 blue, short-persistence Phosphor
SC3093 – 3" Character generatormonoscope for text mode video rendering in early computer monitors and electrostatic printers, with a 2 in × 2 in (5 cm × 5 cm) square target having letters, digits and symbols patterned on it in a customer-supplied 8×8 array. An electron beam selects and scans a character, both by appropriate electrostatic deflection, and generates an analog video signal; cf. 4560, CK1414, TH9503
SC3185 (21 in (53 cm), P4 white), SC3369 (16 in (41 cm), P7 blue/yellow, short/long-persistence), SC3821 (7 in (180 mm), P14 purple/orange, medium/long), SC3875 (19 in (480 mm), P14) – Character Writing Tube, CRTs with both magnetic deflection for character positioning, and electrostatic deflection for character writing from SC3093 output
TuneOn – Early Neon-filled bar graph tuning indicator, a glass tube with a short wire anode and a long wire cathode that glows partially, the glow length is proportional to the tube current;[669] similar to Cossor 3180, 3184, Philips 4662, ИН-9
TuneOn Button – Early glow modulator used as a budget-priced tuning indicator – a Neon lamp whose brightness is proportional to the tube current[670]
Tunograph – Precursor of the "Magic Eye" tuning indicator commercially introduced in 1933, a tiny CRT with 1-axis electrostatic deflection and a phosphored target at 45° to the electron beam, so the projected green dot can be observed from the side[671]
1-V = Ken-Rad KR1 = 6Z3 (Commonly branded as 1V/6Z3) – High-vacuum half-wave rectifier, 6.3 V/300 mA heater, UX4 base; drop-in replacement for the Mercury-vapor type 1
291 (12.6 V/300 mA heater/filament), 293 (6.3 V/600 mA heater/filament), 295 (2.5 V/4 A heater/filament) – Triple-Twin indirectly heated AF signal triode + half-indirectly heated zero bias power triode, internally connected as a cathode follower like today's Darlington transistors; cf. 2B6, 6AC6, 6B5, 6N6-G; not to be confused with the Western Electric 293A resp. 295A
EMV-3A – Emerson MultiValve Three-In-One triple triode used as RF amplifier, grid-leak detector, and AF power amplifier, 5 VDC/250 mA filament, UX4 base with four additional screw terminals on a platform on top of the base[673]
^Tomer, Robert B. (1960). "Getting the Most out of Vacuum Tubes"(PDF). Howard W. Sams Co., Indianapolis. LCCN60-13843. Retrieved 10 Oct 2013. - Chapter 6 discusses heater voltages as one of the many factors leading to proliferation of tube types
^Most of these data are obtained from photomultiplier characteristics. For tubes capable of operating at very high gain factors, the dark emission at the photocathode is taken as the output dark current divided by the gain (or the equivalent minimum anode dark current input multiplied by cathode sensitivity). On tubes where other DC dark-current sources are predominant, the dark noise figure may be used. In this ease, if all the noise originates from the photocathode emission, it may be shown that the photocathode dark emission in amperes is approximately 4×10-19 × <Equivalent noise input in lumens>2 × <Cathode sensitivity in amperes per lumen>2. The data shown are all given per unit area of the photocathode
^The S5 spectral response is in doubt. The data tabulated conform to the published curve with λmax=340 nm. 1963 indications were that the peak value should agree with that of the S4 curve (λmax=400 nm); σtyp and QE would then agree with those for S4 response
^No value for k or λmax is given because the spectral response data are in question. The values quoted for σ and QE are only typical of measurements made at the specific wavelength 253.7 nm and not at the wavelength of peak sensitivity as for the other data
^Care must be used in converting Smax to a σmax figure. Photocathodes having maximum Lumen sensitivity frequently have more red sensitivity than normal, and the formula cannot be applied without re-evaluation of the spectral response for the particular maximum sensitivity device
^100% quantum efficiency implies one photoelectron per incident quantum, or e/hν = λ/12.395, where λ is expressed in Ångström units. Quantum efficiency at λmax is computed by comparing the radiant sensitivity at λmax with the 100% quantum efficiency expression above
^ abJessop, George R.; Vyse, Barry (2000). The Saga of Marconi Osram Valve. Vyse Books Ltd., Pinner, Middlesex, UK. ISBN0-9539127-0-1. In: "Extracts, part 1"(PDF). BVWS Bulletin. Vol. 24, no. 4. The British Vintage Wireless Society. pp. 12ff. Retrieved 1 May 2017. • "Extracts, part 2"(PDF). BVWS Bulletin. Vol. 25, no. 1. pp. 9ff. Retrieved 6 February 2021. • "Extracts, part 3"(PDF). BVWS Bulletin. Vol. 25, no. 3. pp. 18ff. Retrieved 6 February 2021.
^The D/A bit resolution is the binary logarithm of the number of holes at maximum hole density, that fit into the electron beam's circular cross-section; the larger the cross-section, the higher the bit resolution, but at the cost of the function being more smoothed over
^ abcdThe anode of a vari-μ tube is connected to the LC tank circuit, the grid is fed the anode signal phase-shifted 90° by a Wien segment (series-RC between anode and grid, parallel-RC between grid and cathode), so the anode current will be in quadrature phase to the anode voltage, resembling a reactance which can be varied by varying the tube's gm resp. μ
^Adler, Dr. Robert; Haase, Allen P. (September 1949). "The 6BN6 Gated Beam tube"(PDF). Proceedings of the National Electronics Conference. Vol. 5. National Engineering Conference, Incorporated. pp. 408–426. Archived from the original(PDF) on 2022-01-31. Retrieved 17 June 2021.
^5J6 data sheet - this particular Tung-Sol datasheet contains a copy/paste error in the description where it cites 6J6's 450 mA heater current when it should read 5J6's 600 mA
^ abRider, John F.; Seymour, D. Uslan (1948). "FM Transmission and Reception"(PDF). John F. Rider Publisher, Inc. pp. 130–135. Retrieved 25 December 2016.
^Jensen, A.S.; Gray, G.W. (June 1955). "Radechon Storage Tube Circuits"(PDF). RCA Review. RCA Research Laboratory, RCA Laboratories, Princeton, N. J. Retrieved 30 November 2022.
^ abJensen, A.S.; Smith, J.P.; Mesner, M.H.; Flory, L.E. (March 1948). "Barrier Grid Storage Tube and Its Operation"(PDF). RCA Review. IX. RCA Research Department, RCA Laboratories Division, Princeton, N. J. Retrieved 30 November 2022.
^The KN11B, KN12 and KN25 Sprytrons are 3 element vacuum tubes which have no keep-alive/primer. The KN11B delay time is measured at anode potential of 350 V and peak trigger voltage of 300 V. The KN12 delay time is measured at anode potential of 2.3 kV and peak trigger voltage of 800 V. Sprytron trigger voltages were measured with a rise time of 300 ns (10-90% points)
^"Electro-Optics Condensed Catalog"(PDF). EG&G Electro-Optics Division, Salem, Massachusetts, USA. November 1979. Retrieved 23 February 2025.
^ abHAYASHI, Koji; JAPAN, Ibaraki. "戦前の日本独自の特殊管 - 日本無線が作った特殊受信管" [Japan Oriented Special Tubes before WWII - Special Receiving Tubes manifactured by Japan Radio Corp.] (in Japanese).
^Wechselspannungs- und Wechselstrom-Stabilisierungsschaltungen mit der Diode YA1000 [AC voltage and current stabilizing circuits with the YA1000 diode]. Telefunken Laborbuch (in German). Vol. IV. Ulm: AEG-Telefunken. 1967. pp. 189–195. (principal circuit)
^Van Bergen, Fons (2000). "About the French TM valve"(PDF). BVWS Bulletin. Vol. 25, no. 2. The British Vintage Wireless Society. pp. 20ff. Retrieved 1 May 2017.
^Champeix, Robert. "Grande et Petite Histoire de la Lampe TM" [Large and small history of the TM tube] (in French). Les Anciens de la Radio et de l'Électronique. Retrieved 1 May 2017.
Content is not guaranteed, and is subject to change, and is mainly from Wikipedia, and is available under CC BY-SA 4.0 unless otherwise noted - click on images to review their licensing terms.
H3A European 3-pin
A4A Transcontinental European 4-pin
O5A Transcontinental European 5-pin
B6H Continental European 6-pin "Hexode"
C7H Continental European 7-pin "Hexode"
M7A British 7-pin
B9H British 9-pin
UX4 American 4-pin, optionally with Bayonet (=side locating key pin)
UY5 American 5-pin
U6A American 6-pin
U7A/B American 7-pin with pin circle diameters A: 0.75in, B: 0.855in, optionally with Bayonet
P8A Transcontinental European side-contact 8-pin
V5A Transcontinental European side-contact 5-pin
Y8A German steel tube 8-pin, a.k.a. "German Metal Octal"![K8A [International] Octal ("IO"; IEC 67-I-5a) 8-pin](https://upload.wikimedia.org/wikipedia/commons/thumb/a/a1/Roehre-Oktalsockel.jpg/120px-Roehre-Oktalsockel.jpg)
K8A [International] Octal ("IO"; IEC 67-I-5a) 8-pin
K8B MazdaOctal 8-pin with one missing
B12A Duodecal (IEC 67-I-17a, JEDEC B12-43) 12-pin
B8G Loctal (IEC 67-I-9a) 8-pin, a.k.a. Loktal, Lock-in, Octalox
B9G Loctal (IEC 67-I-6a) 9-pin, a.k.a. Enneal
B7A Septar (IEC 67-I-20a, JEDEC E7-2) 7-pin
B7G Miniature 7-pin (IEC 67-I-10a, JEDEC E7-1), a.k.a. Heptal, Small-Button 7, Pico-7
B8A Rimlock (IEC 67-I-11a, JEDEC E8-30) 8-pin, a.k.a. Rimlok, Pico-8
B9A Noval (T6½ env., IEC 67-I-12a, JEDEC E9-1)/Neonoval (T9 env., JEDEC E9-68) 9-pin, a.k.a. Small-Button 9, Pico-9
B9D Magnoval (IEC 67-I-36a, JEDEC E9-23 - not B9E Novar) 9-pin
B10B Decal (IEC 67-I-41a, JEDEC E10-61) 10-pin
B12C Duodecar (IEC 67-I-34a for T9 env. resp. 67-I-35a for T12 env., JEDEC E12-70 resp. E12-74 – Compactron) 12-pin
B4F/U4J Jumbo (IEC 67-I-23, JEDEC A4-29) 4-pin, Bayonet between pins 2, 3
B4D Superjumbo (IEC 67-I-28a, JEDEC A4-81) 4-pin, Bayonet between pins 2, 3
![K8A [International] Octal ("IO"; IEC 67-I-5a) 8-pin](https://commons.wikimedia.org/wiki/File:Roehre-Oktalsockel.jpg)
Media related to Vacuum tube bases at Wikimedia Commons
Globe tube
Baloon tube
Metal tube, this one with a top cap
ST – Shouldered tube, a.k.a. domed baloon tube![GT – Glass Tubular cylindrical tube, a.k.a. Bantam tube, Dwarf tube, "Tom Thumb"[16]](https://upload.wikimedia.org/wikipedia/commons/thumb/3/31/Fender_vacuum_tube.jpg/60px-Fender_vacuum_tube.jpg)
All-glass miniature, a.k.a. Button tube (mostly Heptal, Noval, Duodecar base)
Subminiature all-glass wire-ended (fly-leads in place of pins), low-frequency Pencil tubes
Steel tube(de)
_Svetlana_1969_01.jpg)
![GT – Glass Tubular cylindrical tube, a.k.a. Bantam tube, Dwarf tube, "Tom Thumb"[16]](https://commons.wikimedia.org/wiki/File:Fender_vacuum_tube.jpg)
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