This is a list of vacuum tubes or thermionic valves, and low-pressure gas-filled tubes, or discharge tubes. Before the advent of semiconductor devices, thousands of tube types were used in consumer electronics – most of them to amplify AF, IF and RF signals in TV sets and AM/FM radios; some are still in production today for valve audio amplifiers – but many industrial, military or otherwise professional tubes were also produced, many of these highly specialized; only a few types of those are still used today, mainly in high-power RF/microwave (VLF, LF/LW, MF/MW, HF/SW, VHF low/mid/high, UHF low/high, SHF, EHF, THF) applications.
Tube characteristics
Heater or filament ratings
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 with a low-power filament operated usually from 1 to 2 V; all filaments in a design are rated at the same voltage and are connected in parallel. 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.
Battery types are usually 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 device, 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.- 1.25 V for one NiCd cell (examples)
- 1.4 V for one Leclanché cell, later for one dry cell (examples)
- 1.7 to 1.9 V for one lead-acid cell with a variable filament resistor (German: Heizregler – examples)
- 2 V for one lead-acid cell[2]: 12ff [3]: 8 [4]: 5 (examples)
- 4 V for two lead-acid cells, a 1910s UK standard which e.g. the Fleming valves, the British R, and the French TM tubes ran on.[1] Major manufacturers kept a directly heated 4VDC product line throughout the 1930s[2]: 14 [3]: 9 [4]: 8f. (examples)
- 5 V originally for a three-cell lead-acid battery with a rheostat (examples); later became a standard for indirectly AC-heated full-wave rectifiers (examples)
- 6.3 V, indirectly heated, for four dry cells or for three lead-acid cells for use in 6-Volts car radios[5] (examples)
- 12.6 V, indirectly heated, for six lead-acid cells for 12-Volts car radios (examples)
- Types for AC-only equipment with a mains transformer; all tube heaters are rated at the same voltage and fed in parallel from a transformer secondary winding; In the US, a 2.5 VRMS standard was conceived in 1929; elsewhere, nominal heater voltages from 1920's lead-acid/"battery eliminator" era (multiples of 2 or 2.1V) were kept, 4VRMS in the UK,[1] but eventually the 6.3V and 12.6V car radio standards prevailed everywhere. Most are indirectly heated.
- However, most RF power tubes are 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; some high-power RF tubes (such as RCA 893, 898 and Philips TAW12/35G, TBL15/125) have a 3-phase heater to reduce hum.
- Types for equipment 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 barretter or power resistor chosen so that the sum of the heater and ballast voltages equals the mains voltage. All tubes must be rated at the same heater current such as 50, 100, 150, 200, 300, 450 or 600 mA, depending on mains voltage and device tube count, have a comparable warm-up time, and the heater/cathode insulation has to withstand 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).
- A notable precursor was 1920's European 180mADC standard used in municipalities with a then-still commonplace DC mains system, which ruled out not only mains transformers, but also polarized (electrolytic) capacitors, as the sets had to tolerate accidental reverse-polarity feeding, making it notoriously difficult to filter out dynamo or rectifier howl.[6] Compatible product lines include the Mullard x20 series,[2]: 19 the Mullard–Philips B-series, the Philips B20xx series,[3]: 7 the Telefunken REN(S)18xx series,[7] some Loewe WG3x "integrated circuit" tubes, the Tungsram x18 series,[4]: 10 and the Valvo x18 series. Most of these tubes had 20- or 21-Volts heaters; suitable barretters were available.[8]
| P/I | 150mA | 300mA | 450mA | 600mA |
|---|---|---|---|---|
| 945mW | 6.3V | 3.15V | 2.1V | 1.575V |
| 1.89W | 12.6V | 6.3V | 4.2V | 3.15V |
| 2.835W | 18.9V | 9.45V | 6.3V | 4.725V |
| 3.78W | 25.2V | 12.6V | 8.4V | 6.3V |
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 characteristics,[9] but usually the same heater power, e.g. 6.3 V/300 mA and 12.6 V/150 mA; some tubes feature a center-tapped filament/heater, allowing for two voltage/current options by series or parallel wiring of their two heater sections (examples).
In half-indirectly heated tubes the cathode and one side of the filament share the same pin.
Signal tube grids
- Helix with a constant pitch: "High-slope" = low/medium/high-μ /ˈmjuː/ = sharp-cutoff tube, for use in fixed-gain amplifiers
- Helix with a variable pitch: "Super-control" = Variable mutual conductance = Vari-μ = remote or semiremote-cutoff tube, for use in variable-gain amplifiers where the gain-control voltage is applied as control grid bias
Note: Gain (amplification factor) μ = Mutual conductance gm × Anode resistance Ra
Bases
Drawings below; relevant standards include:
- IEC 60067: "Dimensions of electronic tubes and valves" (1966; also published as BS 448-1:1981)[10]
- JEDEC/JETEC
- Philips
H3A Continental European 3-pin
A4A Continental European 4-pin
O5A Continental European 5-pin
B6H "Hexode" Continental European 6-pin
C7H Continental European 7-pin
M7A British 7-pin
B9H British 9-pin
U4A/UX4 American 4-pin
U6A/UX6 American 6-pin
P8A Transcontinental side-contact 8-pin
V5A Transcontinental side-contact 5-pin
Y8A German steel tube 8-pin, aka "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
B8G Loctal (IEC 67-I-9a) 8-pin, aka Loktal, Lock-in, Octalox
B9G Loctal/Enneal (IEC 67-I-6a) 9-pin
B8A Rimlock (IEC 67-I-11a) 8-pin, aka Rimlok
B9D Magnoval (IEC 67-I-36a, JEDEC E9-23 - not B9E Novar) 9-pin
B9A Noval (T6½ env., IEC 67-I-12a, JEDEC E9-1)/Neonoval (T9 env., JEDEC E9-68) 9-pin
B7G Miniature 7-pin ("Small-button" or "Heptal"; IEC 67-I-10a, JEDEC E7-1)
B7A Septar (IEC 67-I-20a, JEDEC E7-2) 7-pin
B10B Decal (IEC 67-I-41a, JEDEC E10-61) 10-pin
B12A Duodecal (IEC 67-I-17a) 12-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
U4J Jumbo (IEC 67-I-23, JEDEC A4-29) 4-pin
B4D Superjumbo (IEC 67-I-28a, JEDEC A4-81) 4-pin
![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
Envelopes
ST – Shouldered tube, this one with a top cap
GT – Glass Tubular cylindrical tube
All-glass miniature tube (mostly Heptal, Noval, Duodecar base)
Subminiature all-glass wire-ended (fly-leads in place of pins), low-frequency Pencil tubes
Steel tube(de)
Special quality tubes
Premium/SQ tubes for professional/industrial/computer/telecommunications purposes featured some modifications including:
- Long-life design
- Tightened specifications
- Gold-plated base pins to prevent corrosion and, especially during the 400...600 °C bake-out, entry of hydrogen into the Cunife or Fernico (Kovar) base material
- Gold-plated grid wires to prevent secondary emission
- Tightly twisted pair filament inside the cathode sleeve to reduce hum pickup from the AC heater supply
- Silicon-free filament to avoid cathode interface/poisoning after prolonged periods in cut-off (required in digital circuitry and in hot spares)
- Improved oxide insulation between the heater and cathode sleeve so the cathode could be elevated to a higher voltage above the heater supply
Note that a cathode positive to the heater was less detrimental to the oxide insulation between heater and cathode than the reverse, helping to prevent pyrometallurgical electrolytic 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 - No getter to minimize internal leakage currents via getter material condensed on the inside walls of electrometer tubes
- Dual getters to maintain a better vacuum
- More rigid electrode supports to reduce microphonics and improve vibration and shock 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 device
- Constricted envelope section to firmly hold specially shaped flakeless mica spacers in place (5920/E90CC, 6084/E80F, 6922/E88CC)
Numbering systems
North American systems
Standardizing bodies were:
- RMA – Radio Manufacturers Association (1924)
- JETEC – Joint Electron Tube Engineering Council[11] (1944, RMA/NEMA joint venture, to become EIA/NEMA JEDEC in 1958 with the advent of semiconductors)
- RTMA – Radio-Television Manufacturers Association (1950)
- RETMA – Radio Electronics Television Manufacturers Association (1953)
- EIA – Electronic Industries Association (1957)
RETMA standard tubes system
In use since 1933 on the RMA Electron Tube Registration List, now known as the RETMA system
- A number ("prefix") with up to 3 digits indicating the heater voltage rounded .6 down to the nearest whole number; 0 indicates a cold-cathode tube. Tubes with a center-tapped filament/heater are assigned the higher voltage option
Exceptions include 2 volts DC filament tubes; 5-prefix series heater tubes, which go up to 5.9 volts (5U9/LCF201, 5X9/LCF200) to avoid cluttering the 6-prefix; 7-prefix and 14-prefix Loctal tubes; 11.6-volts 10GV8/LCL85; 17-volts 16Y9/PFL200[12] - Up to 2 sequentially assigned letters, skipping the letters I and O. After the single letters were exhausted, combinations like AB, AC, AD, AE... were used, avoiding same-letter repetitions and reserving those ending in P for CRTs (see below)
Wherever possible, tubes that differed only in the heater ratings had the same letters; exceptions include: the 12BR7 and 9BR7 are unrelated to the 6BR7; the 4BL8/XCF80 is the 4.6 V/600 mA series heater version of the 6BL8/ECF80, but the 450mA series heater version is the 6LN8/LCF80 rather than 6BL8. The change of letters was required because the 6LN8 is 6.0 volts while the 6BL8 is 6.3 volts - A number with up to 2 digits indicating the count of active elements in the tube, including any shield and the heater in indirectly heated tubes – internally connected elements count as one; the use is somewhat arbitrary:
- 1 – Directly heated half-wave rectifier; ballast tube/resistor; barretter
- 2 – Half-wave rectifier; ballast tube with a lockout jumper; barretter with a filament tap for pilot lamp(s)
- 3 – Rectifier; directly heated triode
- 4 – Rectifier; directly or indirectly heated triode or pentode; indirectly heated triode thyratron
- 5 – Indirectly heated full-wave rectifier; separate cathodes dual diode; triode; tetrode; Shadow-Grid beam pentode/hexode; Triple-Twin; tuning indicator; indirectly heated triode thyratron
- 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; 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 + dual-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 + three-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 – 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, up to three Latin letters indicating various revisions and improvements to the original model or different envelope shapes; the use is somewhat arbitrary:
- A, B, C – Improved backward compatible versions
- E – Export version
- G – Shouldered glass envelope, ST-12 to ST-16 size
- GT – Glass Tubular cylindrical envelope, T-9 size
- GT/G – Glass envelope, T-9 size interchangeable with G and GT types
- L – Loctal base
- LM – Metal envelope with an Octalox (=Loctal) base
- LT – Glass tubular envelope with an Octalox base
- M – Metal envelope with an Octal base
- MG – Metal-glass tube, a glass envelope hidden inside a tightly fitting metal jacket to make it look like a metal envelope
- ML – Metal envelope with a Loctal base
- S – Metal particles spray-shielded glass envelope
- W – Ruggedised, or military grade
- WA, WB – Improved, backward compatible military/industrial variants
- X – Low loss ceramic base for RF use
- Y – Low loss mica-filled phenolic resin ("Micanol")[13] base for RF use
- Lastly, manufacturers may decide to combine two type numbers into a single name, which their one device can replace, such as: 6DX8/ECL84 (6DX8 and ECL84 being identical devices under different naming schemes) or 6BC5/6CE5 (sufficiently identical devices within the RETMA naming system) and even 3A3/3B2, or 6AC5-GT/6AC5-G (where the single type number, 6AC5-GT/6AC5-G, supersedes both the 6AC5-G and the 6AC5-GT)
Ballast tubes/resistors and barretters were assigned the following subset:
- <Voltage>A1 to <Voltage>Z1 – No filament tap, no jumper
- <Voltage>A2 – Filament tap for two pilot lamps
- <Voltage>B2 – Filament tap for one pilot lamp
- 1D2, 1E2 – With a jumper to unpower the device when the ballast is pulled from its socket
For examples see below
- The first number gives the screen diagonal or diameter in inches (instead of the heater voltage)
- One or two sequentially assigned letters
- The last number is preceded by a P and specifies the phosphor used
Examples:
- 1EP1 (P1 green, medium-persistence), 1EP2 (P2 yellow-green, long-persistence), 1EP11 (P11 blue, short-persistence) – 1" (2.5 cm) CRT for use in oscilloscopes, electrostatic deflection
- 2AP1, 2BP1 – 2" (5.1 cm) CRT for use in oscilloscopes, electrostatic deflection
- 3ABP1, 3ABP2, 3ABP7 (blue/yellow, short/long), 3ABP11 – Dual-beam 3" (7.6 cm) CRT for use in oscilloscopes, electrostatic deflections
- 4AP10 – 4" (10 cm) Skiatron, a CRT where the conventional light-emitting phosphor layer is replaced with a scotophor such as potassium chloride, 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.[14]: 2 It therefore needs backlighting or external illumination like today's electronic paper[15][16]
- 4DP1, 4DP2, 4DP7, 4DP11 – Dual-beam 4" CRT for use in oscilloscopes, electrostatic deflections
- 5BP1 (1802-P1) – 5" (13 cm) CRT for use in pre-World War II oscilloscopes, electrostatic deflection, P1 green, medium-persistence[17]
- 5BP3 (1802-P3) – Pre-World War II, 5" CRT, electrostatic deflection, P3 yellow, medium-persistence[17]
- 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,[18] electrostatic deflection, P4 white, medium-persistence[17]
- 5BP11A – 5" CRT, electrostatic deflection, P11 blue, short-persistence[19]
- 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 for use in a telecine
- 6DP1, 6DP2, 6DP7, 6DP11, 6DP14 (purple/orange, medium/long), 6DP19 (orange, long), 6DP25 (orange, very long) – Triple-beam 6" (15 cm) CRT for use in oscilloscopes, electrostatic deflections
- 7JP1 – 7" (18 cm) CRT for use in early postwar oscilloscopes, electrostatic deflection, P1 green, medium-persistence[20]
- 7JP4 – 7" CRT common in early postwar TV receivers, electrostatic deflection, P4 white, medium-persistence[20]
- 7JP7 – 5½" (14 cm usable screen diameter) CRT for use in early postwar radar displays, electrostatic deflection, P7 blue/yellow, short/long-persistence[20]
- 7NP4 (60 ft (18 m) projection distance), 7WP4 (80 ft (24 m) projection distance) – 7" Theatric projection CRTs, 75 kV anode voltage, considerable X-radiation, magnetic deflection, P4 white, medium-persistence, cast a 20 ft × 15 ft (6.1 m × 4.6 m) image
- 8CP1, 8CP2, 8CP4, 8CP5 (blue, very short), 8CP7, 8CP11 – 8" (20 cm) CRT for use in oscilloscopes, electrostatic deflection
- 14BCP22 – 14" (36 cm) Color CRT, 50° × 70° magnetic deflection, P22 RGB, medium-persistence
- 30BP4 – 30" (76 cm) CRT used in 1950s premium television receivers, 90° magnetic deflection, P4 white, medium-persistence
RMA professional tubes system
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")[12]
First digit Filament/heater power rating:
- 1 – No filament/heater; cold cathode or solid state device
- 2 – Up to 10 W
- 3 – 10...20 W
- 4 – 20...50 W
- 5 – 50...100 W
- 6 – 100...200 W
- 7 – 200...500 W
- 8 – 500W...1 kW
- 9 – More than 1 kW
Next character: Function - multiple section tubes (like the 3E29 or 8D21) are assigned one letter corresponding to one set of electrodes:
- A – Single element (ballast tube/barretter)
- B – Two-element device such as:
- Diode, vacuum or gas-discharge or mercury-vapor rectifier
- Glow modulator tube, a linear gas-discharge light source for rotating-drum FAX receivers, film soundtrack recording, etc.
- Voltage-regulator tube
- Radiation detector tube (Geiger-Müller counter tube or proportional counter tube)
- Spark gap, arc-discharge tube
- TR (Transmit/receive) cell, a cold-cathode water vapor discharge tube for use in radar systems, short-circuits the receiver input to protect it while the transmitter operates
- ATR (Anti-transmit/receive) cell, a cold-cathode water vapor discharge tube for use in radar systems, decouples the transmitter from the antenna while not operating, to prevent it from wasting received energy
- C – Triode
- D – Tetrode
- E – Pentode or beam power tetrode
- F – Hexode
- G – Heptode
- H – Octode
- J – Magnetically controlled devices, usually incorporating a resonator (essentially, a Magnetron)
- K – Electrostatically controlled devices, including a resonator (Klystron, inductive output tube)
- L – Vacuum capacitor
- N – Crystal rectifier (This designation lived on as the "N" in the EIA/JEDEC EIA-370 solid state device numbers standard, like 2N2222)
- P – Photosensitive devices (phototube, photomultiplier, camera tube, image converter)
- Q – Resonant vacuum cavity
- R – Ignitron, mercury-vapor rectifier
- S – Vacuum switch
- T – Electron beam tube such as a deflection control tube (no known examples assigned)
- V – Flashtube
- W – Traveling-wave tube
- X – X-ray tube
- Y – Thermionic converter
The last 2 digits were sequentially assigned, beginning with 21 to avoid possible confusion with RETMA tube or CRT phosphor designations
For examples see below
EIA professional tubes system
A four-digit system 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:
- CK, RK – Raytheon Company
- ECG – Philips/Sylvania
- F – ITT/Federal Telephone and Radio
- GL – General Electric Corp. (not British General Electric Company)
- ML – Machlett Laboratories, Inc.
- NL – Eimac/National Electronics, Inc. (Geneva, Illinois, USA)
- NU – National Union Electric Corp. (Orange, New Jersey, USA)
- PL – Philips N.V.
- SV – Svetlana:
- formerly only ПАО «Светлана» (PJSC "Svetlana"), St. Petersburg, Russia
- now also a brand of New Sensor Corp., Long Island City, New York, USA, manufacturing in Сара́тов (Saratov), Russia
- WL – Westinghouse Electric Corp.
For examples see below
Eimac transmitting tubes system
Eitel/McCullough and other manufacturers of high-power RF tubes use the following code since 1945:[21]
- An initial digit denoting the number of electrodes, or cavitiy resonators if followed by the letter K:
- 1K – Reflex Klystron
- 2 – Diode
- 2K – 2-cavity Klystron
- 2KD – Klystrode
- 3 – Triode
- 3K – 3-cavity Klystron
- 4 – Tetrode
- 4K – 4-cavity Klystron
- 5 – Pentode
- 5K – 5-cavity Klystron
- 6K – 6-cavity Klystron
- 7K – 7-cavity Klystron
- Up to 2 letters denoting the construction type and the cooling method:
- R or a dash ("-") – Glass envelope, radiation cooling
- C – Ceramic/metal envelope
- P – Primarily for pulse applications
- L – External anode, liquid convection cooling
- M – Multiphase-cooled (water/vapor), or has a modulating anode (Klystrons only)
- N – External anode, natural convection air cooling
- S – External anode, conduction cooling
- V – Vapor-cooled (anode is immersed in boiling water, and the steam is collected, condensed and recycled)
- W – Water-cooled (water is pumped through an outer metal jacket thermically connected to the anode)
- X – Forced-air cooled (air is blown through cooling fins thermally connected to the anode)
- A number to indicate the maximum anode dissipation in watts. This 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. As of 1 May 1961, Klystron maximum collector dissipation is given in kilowatts for brevity
- One or more manufacturer-proprietary letters denoting the construction variant:
- —Klystrons/Klystrodes only:
- P – 225 to 390 MHz
- L – 390 to 1550 MHz
- S – 1.55 to 3.9 GHz
- SH, SI, SJ – S band
- C – 3.9 to 6.2 GHz
- X – 6.2 to 10.9 GHz
- XA – X band, coaxial output
- XD, XF, XG, XK, XN, XS – X band, waveguide output
- K – 10.9 to 36 GHz
- Q – 36 to 46 GHz
- V – 46 to 56 GHz
- An optional digit denoting the gain group:
- 1 – ≤10
- 2 – 11...20
- 3 – 21...30
- 4 – 31...50
- 5 – 51...100
- 6 – 101...200
- 7 – 201...500
- 8 – 501...1000
Examples:
- 1K125CA – 1.25 W 3.7 to 4.4 GHz, waveguide output Reflex Klystron
- 2-50A – 30 kV, 75 mA Half-wave rectifier
- 2-2000A – 75 kV, 750 mA Half-wave rectifier
- 2X3000F – 25 kV, 3 A Forced-air cooled, half-wave rectifier
- 2KDX15LA (15 kW, 470 to 600 MHz), 2KDX15LF (15 kW, 600 to 860 MHz), 2KDX40LA, 2KDX40LF (40 kW) – Forced-air cooled, electromagnet-focused Klystrodes[22][23]
- 2KDW60LA, 2KDW60LF – Water cooled, 60 kW, electromagnet-focused Klystrode[24]
- 3-200A3 = 592 – 150 MHz, 200 W Glass power triode with anode on top cap
- 3-400Z/8163 – 110 MHz, 400 W Glass power triode with anode on top cap
- 3-1000Z/8164 – 110 MHz, 1 kW Glass power triode with anode on top cap
- 3CPN10A5/7815 (contact-cooled), 3CPX100A5/7815R (forced-air cooled) – 3 GHz, 10 Wavg, 2 kWpeak Ceramic/metal UHF pulse power triode
- 3CW5000A1/8240, 3CW5000F1/8241 (with flexible leads for grid and filament) – 5 kW Ceramic/metal power triode, water-cooled
- 3CW5000A3/8242 (up to 75 MHz), 3CW5000F3/8243 (with flexible leads for grid and filament, up to 30 MHz) – 5 kW Ceramic/metal power triode; water-cooled variants of 3CX2500A3 and 3CX2500F3
- 3CW50000C/8350 – 30 MHz, 50 kW Ceramic/metal power triode, water-cooled
- 3CX100A5/7289 (6.0 V heater), 3CX100F5/8250 (26.5 V heater) – 3 GHz, 100 W Oil can-type ceramic/metal disk-seal UHF power triode, forced-air cooled, often used by radio amateurs for 23cm-band microwave amplifiers; 2C39A with different heaters
- 3CX1000A7/8283 – 220 MHz, 1 kW Ceramic/metal power triode
- 3CX1500A7/8877 – 110 MHz, 1.5 kW Ceramic/metal power triode, forced-air cooled
- 3CX2500A3/8161, 3CX2500F3/8251 – 2.5 kW Ceramic/metal triode; forced-air cooled variants of 3CW5000A3 and 3CW5000F3
- 3CX3000A1/8238, 3CX3000F1/8239 (with flexible leads for grid and filament) – 3 kW Ceramic/metal AF power triode
- 3CX10000A1/8158 – 10 kW Ceramic/metal AF power triode
- 3CX10000A3/8159 – 140 MHz, 10 kW Ceramic/metal power triode for use as self-excited high-power oscillator in induction heating equipment
- 3CX10000A7/8160 = Siemens RS2015CL – 110 MHz, 10 kW Ceramic/metal power triode
- 4-65A/8165 – 150 MHz, 65 W Glass beam power tetrode, 5-pin Septar base with anode on top cap
- 4-125A/6155 (4D21) – 120 MHz, 125 W Glass beam power tetrode
- 4X150A/7034 = QEL1/150 – Forced-air cooled 150 W beam power tetrode
- 4-250A/6156/5D22 – 110 MHz, 250 W Glass beam power tetrode
- 4-400A/8438, 4-400C/6775 – 110 MHz, 400 W Glass radial-beam power tetrode
- 4-1000A/8166 – 110 MHz, 1 kW Glass beam power tetrode popular in broadcast and amateur transmitters
- 4CM300000G – 50 MHz, 300 kW Ceramic/metal power tetrode, water/vapor cooled, for use in broadcast transmitters
- 4CPX250K/8590 – 500 MHz, 250 Wavg, 17.5 kWpeak Ceramic/metal radial-beam grid-pulsed power tetrode
- 4CW2000A/8244 – 110 MHz, 2 kW Ceramic/metal radial-beam power tetrode; water-cooled variant of 4CX1000A/8168
- 4CX250B/7203 = QEL2/275 (6.0 V heater), 4CX250F/7204 = QEL2/275H (26.5 V heater), 4CX250FG/8621 (26.5 V heater) – 500 MHz, 250 W Ceramic/metal power tetrode, forced-air cooled, favored by radio amateurs as a final amplifier
- 4CX250BC/8957 – Long-life, tighter specs version of 4CX250B
- 4CX250K/8245 (6.0 V heater), 4CX250M/8246 (26.5 V heater) – 500 MHz, 250 W Ceramic/metal radial-beam power tetrode
- 4CX300A/8167 – 500 MHz, 300 W Ceramic/metal power tetrode
- 4CX300Y/8561 – 110 MHz, 300 W Ceramic/metal power tetrode
- 4CX350A/8321 = YL1340 (6.0 V heater), 4CX350F/8322 = YL1341 (26.5 V heater) – 350 W Ceramic/metal radial-beam AF power tetrode
- 4CX350FJ/8904 – Improved 4CX350F/8322
- 4CX600J/8809, 4CX600JA/8921 (larger anode cooler) – 600 W Ceramic/metal radial-beam AF power tetrode
- 4CX1000A/8168 (110 MHz), 4CX1000K/8352 (with a solid screen ring for UHF use) – 1 kW Ceramic/metal radial-beam power tetrode; forced-air cooled variant of 4CW2000A/8244
- 4CX3000A/8169 – 150 MHz, 3 kW Ceramic/metal radial-beam power tetrode
- 4CX5000A/8170 = Siemens RS2014CL, 4CX5000R/8170W (shock/vibration resistant) – 110 MHz, 5 kW Ceramic/metal radial-beam power tetrode
- 4CX5000J/8909 – 100 MHz, 5 kW Ceramic/metal radial-beam power tetrode
- 4CX10000D/8171 – 110 MHz, 10 kW Ceramic/metal radial-beam power tetrode; 4CX5000A/8170 with a larger cooler
- 4CX12000A/8989 – 220 MHz, 12 kW Ceramic/metal radial-beam power tetrode
- 4CX15000A/8281 – 110 MHz, 15 kW Ceramic/metal radial-beam power tetrode
- 4CX15000J/8910 – 100 MHz, 15 kW Ceramic/metal radial-beam power tetrode
- 4CX20000A/8990 – 110 MHz, 20 kW Ceramic/metal radial-beam power tetrode
- 4CX35000A, 4CX35000C/8349 (longer screen/anode insulator for Class-C screen grid or anode modulation) – 110 MHz, 35 kW Ceramic/metal power tetrode, forced-air cooled, used in numerous 50-kW broadcast transmitters, often in a Doherty configuration as in the Continental Electronics 317C series
- 5-125B/4E27A – 75 MHz, 125 W Glass power pentode
- 5-500A – 500 W Glass radial-beam power pentode
- 5CX1500A – 110 MHz, 1.5 kW Ceramic/metal radial-beam power pentode, forced-air cooled
- 5CX3000A – 150 MHz, 4.0 kW Ceramic/metal radial-beam power pentode, forced-air cooled
- 5K50CB – Ethylene glycol-cooled, 4.4 to 5.0 GHz, 10 kW electromagnet-focused linear-beam, 5-cavity Klystron for use in C-band troposcatter systems
- 5K70SH – Forced-air and water-cooled, 2450 MHz, 30 kW, electromagnet-focused linear-beam, 5-cavity Klystron for use in industrial heating applications
- 5KM300SI – Forced-air and water-cooled, 2.1 to 2.4 GHz, 100 kW, electromagnet-focused linear-beam, 5-cavity Klystron for use in Unified S-band ground transmitters of spacecraft communications systems
- 6K50000LQ – Forced-air and water-cooled, 720 to 980 MHz, 10 kW, permanent magnet-focused linear-beam, 6-cavity Klystron
- 7KP50SV – 3.43 to 3.57 GHz, 11 kWavg, 3 MWpeak, 7-cavity pulsed Klystron[25]: 9
Eimac also maintained an internal prototype numbering system consisting of the letter X followed by 3 or 4 digits, such as "X-2159".
Media related to Eimac vacuum tubes at Wikimedia Commons
West European systems
Mullard–Philips system
This system is very descriptive of what type of device (triode, diode, pentode etc.) it is applied to, as well as the heater/filament type and the base type (Octal, Noval, etc.).[12][26] Adhering manufacturers include AEG (de), Amperex (us), CdL (1921, French Mazda brand), CIFTE (fr, Mazda-Belvu brand), EdiSwan (uk, British Mazda brand), La RadioTechnique Compelec (fr, Coprim, Miniwatt-Dario and RTC brands), Lorenz (de), MBLE(fr, nl) (be, Adzam and Ultron brands), Mullard (uk), Philips (nl, Miniwatt brand), RCA (us), RFT(de, sv) (de), Siemens (de), Telefunken (de), Tesla (cz), Toshiba (ja), Tungsram (hu), Unitra (pl, Dolam, Polam and Telam brands) and Valvo(de, it) (de).
Standard tubes
This part dates back to the joint valve code key (German: Röhren-Gemeinschaftsschlüssel) negotiated between Philips and Telefunken in 1933–34.[27]: 228 Like the North American system the first symbol describes the heater voltage, in this case a Latin letter rather than a number. Further Latin letters, up to three, describe the device followed by one to four numerals assigned in a semi-chronological order of type development within number ranges assigned to different base types.[28]
If two devices share the same type designation other than the first letter (e.g. ECL82, LCL82, PCL82, UCL82) they will usually be identical except for heater specifications; however there are exceptions, particularly with output types (for example, both the PL84 and UL84 differ significantly from the EL84 in certain major characteristics, although they have the same pinout and similar power rating). However, device numbers 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, whereas the triode section of an ECL86 does happen to be similar to those of an ECC83.
Pro Electron maintained a subset of the M-P system after their establishment in 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-digit numbers starting with 1, 2, 3, 5, 8, 9 for the base.[29]
Note: Marconi preceded the M-P designation with the letter M (as in MEBC3 for EBC3), Tungsram with the letter T, Ultron (MBLE)(fr, nl) with the letter U and VATEA (VÁkuum TEchnológiA) Rádiótechnikai és Villamossági Rt.-t. (VATEA Radio Technology and Electric Co. Ltd., Budapest, Hungary) with the letter V
- First letter: heater/filament type
- Heater ratings for series-string, AC/DC tubes are given in milliamperes; heater ratings for parallel-string tubes are given in volts. Tubes with a center-tapped filament/heater are assigned the lower voltage option
- A – 4 V heater for 2-cell lead-acid batteries and for AC mains transformers
- B – 180 mA DC series heater
- C – 200 mA AC/DC series heater
- D – 1.4 V DC filament for Leclanché cells, later low-voltage/low-power filament/heater:
- 0.625 V 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[30]
- Wide range 0.9 V to 1.55 V DC directly heated for dry cells
- 1.25 V DC directly heated for NiCd batteries
- 1.25 V or 1.4 V AC from a separate heater winding on CRT horizontal-output transformers, in half-indirectly heated EHT rectifiers
- 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
- In 1938, Philips tried to define this letter as "4 V battery", as opposed to A for "4 V AC"[3]: 2
- I – 20 V heater
- K – 2.0 V filament for 1-cell lead-acid batteries, 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 – No heater, i.e. semiconductors
- Gas-filled cold-cathode tubes were shifted to Z before their mass production started
- Philips sold a family of 150mA series heater tubes under this letter in South America
- P – 300 mA AC/DC series heater
- Q – 2.4 V, indirectly heated
- R – Not assigned to avoid any confusion with the older Telefunken "R" system or with German army tubes
- S – 1.9 V, indirectly heated
- T – Custom heater
- U – 100 mA AC/DC series heater
- V – 50 mA AC/DC series heater
- X – 600 mA AC/DC series heater
- Y – 450 mA AC/DC series heater, shifted to L to avoid conflicts with the professional tubes system
- Z – Cold-cathode tube; was shifted here from O after the advent of semiconductors
- Second and subsequent letters: System type
- —Heated tubes (all heater/filament letters except O and Z):
- <none> or R – Resistive element (ballast tube/barretter)
- A – Small signal diode
- B – Dual small signal diode
- C – Small signal triode
- D – Power triode
- E – Small signal tetrode
- F – Small signal pentode
- H – Mixer hexode, special-purpose heptode
- K – Mixer heptode or octode
- L – Power pentode or beam power tetrode
- M – Optical tuning/level indicator - a built-in amplifier triode is not reflected in indicator type numbers, but diodes and pentodes are
- N – Gas-filled thyratron
- P – Secondary emission tube – mostly used as third letter
- Q – Nonode
- S – Special tube (German: Sonderröhre)
- T – Beam deflection tube, or misc.
- W – Half-wave gas-discharge rectifier
- X – Full-wave gas-discharge rectifier
- Y – Half-wave high-vacuum rectifier (power diode)
- Z – Full-wave high-vacuum rectifier (dual power diode with common cathode)
- —Heater/filament letter O (very early semiconductors):[31]
- A – Diode
- AP – Photodiode
- AZ – Zener diode
- C – Transistor
- CP – Phototransistor
- D – Power transistor
- RP – Photoresistor
- Y – Power diode
- For examples see below under O. This part lived on in the later Pro Electron semiconductor designation system (also the tube letters F "pentode" becoming "RF transistor", and L "power pentode" becoming "RF power transistor")
- —Heater/filament letter Z (Cold-cathode tubes):[32]
- A – Arc discharge tube
- B – Binary counter or switching tube
- C – Common cathode Counter Dekatron that makes only carry/borrow cathodes separately available for cascading
- E – Electrometer tube
- G – Gating tube
- M – Optical indicator
- 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
- U – Low-power tetrode thyratron, may mean:
- Trigger tetrode, one starter electrode and a primer (keep-alive) electrode for ion availability 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 primer electrode
- X – Shielded Trigger pentode, two starter electrodes, a primer electrode and a conductive coating of the glass envelope inside connected to a separate pin
- For examples see below under Z
- Following digits: Model number
- —Heater/filament letters M, N, O, Q, and S: Sequentially assigned number
- —All other heater/filament letters: Base type
- —Signal tubes since 1963:
- Even number: Low/medium/high-μ = sharp-cutoff tube
- Odd number: Vari-μ = remote-cutoff tube
- —Power pentodes and triode/power pentode combinations:
- Even number: Linear tube for use in distortion-critical circuits such as Class-A, AB or B, SSB or audio power amplifiers
- Odd number: Less linear tube for use in more distortion-tolerant circuits such as video or Class-C RF amplifiers
- —Signal tubes since 1963:
- 1–9 – Sequentially assigned, comprising most base types popular in 1934–37:
- P8A Side-contact 8 (near-exclusive since 1937)
- A G or GT suffix denotes an export version with a K8A Octal base for the Australian market (EBF2G/GT, ECH3G, ECH4G, EK2G/GT, EL3G, KF3G, KK2G, KL4G)
- V5A Side-contact 5 (AB2, CB1, CB2, EB1, EB2, KB2, UY2, VY2)
- A4A European 4-pin (AX1)
- O5A European 5-pin (AB1, AF2, AN1, BB1, BL2, KL1)
- C7H European 7-pin (ACH1, AK1, BCH1, DCH1, KF1, KF2)
- K8A Octal mostly for South American markets (OBC1, OBC3, OBF2, OCH4, OH4, OF1, OF5, OF9, OM5, PBC3, PBF2, PF9, PH4, PM5, UBC1, UBF2, UBL1, UCH4, UF8, UF9, UL1, UM4, UY1)
- Acorn tube (DxC, D(1)xF, E1C, E(1)xF)
- B4B 4-pin subminiature hearing aid base (EY1)
- B12A Duodecal 12-pin (E1T)
- 10–19 – Y8A Steel tube 8-pin (introduced in 1937)
- 20–29 – B8G 8-pin Loctal
- —Before 1942:
- K8A Octal with filament Mazda/EdiSwan-style between pins 1 and 8 (DAC21, DBC21, DCH21, DF21, DF22, DK21, DL21, DLL21, DM21)
- P8A Side-contact 8 (FDD20)
- 50–59 – Miscellaneous:
- X3A Lighthouse-type disk-seal tube with a K8A Octal base (EC56, EC57)
- X4A etc. Rocket-type disk-seal coaxial tube (EA52, EA53, EC55)
- B8G 8-pin Loctal (DFF50, DFF51, EF51, EF52)
- B9G 9-pin Loctal (EC52, EC54, EE50, EF50, EF54, EF55, EF59, EFF50, EFF51)
- K8A Octal (DAH50)
- B9D Magnoval (E55L)
- B26A Trochotron base (ET51)
- A4A European 4-pin (AX50, AZ50)
- 2+1-pin subminiature (DA50)
- B3G 3-pin subminiature (EA50, EC53)
- B4B 4-pin subminiature hearing aid base (DC51, DD51, DF51, DL51, KC50, KC51, KD50, KE50)
- P8A Side-contact 8 (AC50, CF50, CF51, EC50, EL50, EL51, EL53, EL54)
- Y10A Steel tube 10-pin (UEL51)
- BA15d Noise diode base (K5xA)
- Wire-ends (DY51, EY51, KY50, ORP5x, Z50T)
- 60–69 – Low-frequency Pencil tubes – subminiature, all-glass, inline wire-ended tubes (DCF60, DF6x, DL6x, ORP6x)
- —Before the 1950s:
- 60 – M7A British 7-pin base (AL60)
- 60–64 – B9G 9-pin Loctal (EFP60, EL6x, EW60)
- 70–79 – Low-frequency Pencil tubes with circular pins or wire-ends (DC70, DF7x, DL7x, DM7x, DY70, EA7x, EC7x, ECC70, EF7x, EL71, EN70, EY70, Z7xU, Z70W)
- —Before the 1950s:
- 70–79 – B8G 8-pin Loctal (Lorenz EBL/UBL71, ECH/UCH71, EEL/UEL71, EM71, EM72, PY71, UL71)
- 80–89 – B9A Noval
- 90–99 – B7G Miniature 7-pin
- 100–109 – Various bases:
- O5A European 5-pin (AC101, AC104, AD101, ED100)
- P8A Side-contact 8 (AH100)
- B7G Miniature 7-pin (DA101, DFF101, DLL10x)
- P5A, P7A German PTT bases (AC100, AC102, AD100, AD102)
- S8B Wehrmacht base (AF100)
- 110–119 – Various bases:
- Y8A Steel tube 8-pin (EA111, EF111, EF112, EDD111, EL112, ES/US111)
- B8A Rimlock (ECL113, ED111)
- 130–139 – K8A Octal (EL/PL136, E130L)
- 150–159 – Miscellaneous:
- X3A Lighthouse-type disk-seal tube with a K8A Octal base (EC157, EC158)
- Y8A Steel tube 8-pin (EL150)
- Y10A Steel tube 10-pin (EL151, EL156, EZ150)
- B10V 10-pin glass with one big pin (EL152, EL153, FL152)
- 160–169 – Inline wire-ended low-frequency Pencil tubes (DF16x, DL16x, DM160)
- —Before the 1950s:
- 162 – Y8A Steel tube 8-pin (EC162)
- 170–179 – RFT Gnome tubes:[34]
- 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)
- 180–189 – B9A Noval (ECC/PCC/XCC/YCC18x, E18xCC, EF/LF/XF/YF18x, E18xF, EL18x, EY189)
- 190–199 – B7G Miniature 7-pin (DAF191, DF/EF19x, DK192, DL19x)
- 200–209 – B10B Decal; Pro Electron-issued (ECF/LCF/PCF20x, ECH/PCH200, ECL/PCL200, EFL/LFL/PFL200)
- 230–239 – K8A Octal (ECC230, E23xL)
- 270–279 – B11G RFT 11-pin all glass Gnome tube with one offset pin
- 280–289 – B9A Noval (E28xCC, E28xF)
- 300–399 – K8A Octal (EC36x, EL/PL3xx, Z30xC, Z300T)
- 400–499 – B8A Rimlock (EF410, EL401)
- 500–529 – B9D Magnoval; Pro Electron-issued (ED/PD5xx, EL/LL/PL/XL5xx, EY/GY/PY5xx, PCL501)
- 560–599 – Miscellaneous:
- 600–699 – Inline wire-ended low-frequency Pencil tubes (DF6xx, DL6xx, Z66xW)
- 700–799 – Circular wire-ended low-frequency Pencil tubes (DC76x, DF703, EC760, EF7xx, Z70xU, Z700W)
- 800–899 – B9A Noval; Pro Electron-issued (EAF801, EC860, ECC8xx, PCE800, ECF/LCF/PCF/XCF8xx, ECL/PCL8xx, ECLL800, EF/IF8xx, E810F, EH860, AL/EL/IL/PL8xx, EM8x0, EMM80x, DY/EY/GY/PY80x, Z86xA, Z80xU, Z8xxW, Z86xX)
- 900–999 – B7G Miniature 7-pin; Pro Electron-issued (DAF961, DD960, DF9xx, DK962, DL9xx, DY900, EAA901, EC/LC/PC/XC90x, ECC96x, EH900, EZ900, Z960A, Z900T)
- —Special quality:
- 1000s – Round wire-ended (EC10x0)
- 2000s – B10B Decal (ECC2000)
- 3000s – K8A Octal (EL3010) or P8A Side-contact 8 (EY3000)
- 5000s – B9D Magnoval (EF5000, EL50x0)
- 8000s – B9A Noval (EC80x0, ECC8100, ECF8070, ECH8000, ED8000, EF8010, EL8000, GA8600)
- 9000s – B7G Miniature 7-pin base
For examples see below
Special quality tubes
Premium/SQ tubes (also French: "Securité - Qualité") for professional/industrial/computer/telecommunications purposes featured some modifications including those listed above
—SQ numbering before c.1960: System type letter and base type number swapped;[35] 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
—SQ numbering since c.1960: 4-digit numbers listed above;[26] for examples see below, starting at EC
—Some manufacturers simply appended the letter S to the standard typecode (EF804 → EF804S)
Professional tubes
In use since at least 1961, this system was maintained by Pro Electron after their establishment in 1966.[29]
Both letters together indicate the type:
- X – High-vacuum electro-optical devices
- XA – Phototube
- XG – Miscellaneous
- XM – Character generating cathode ray tube
- XP – Photomultiplier
- XQ – Camera tube
- XR – Monoscope
- XS – Cathode ray charge storage tube
- XT – Memory display tube
- XV – Infrared detector
- XW – Infrared imaging device
- XX – Image intensifier or image converter
- Y – Vacuum tubes
- YA – Diode
- YD – Transmitting or industrial, single or dual triode
- YG – Electrometer tube, vacuum gauge
- YH – Traveling-wave tube
- YJ – Magnetron
- YK – Klystron
- YL – Transmitting or industrial, single or dual tetrode or pentode
- YN – Backward-wave oscillator
- YP – Electron multiplier
- YR – Crossed-field amplifier
- YT – Pulse modulator tube
- YY – High-vacuum rectifier
- Z – Gas-filled tubes not employing photosensitive materials
- ZA – Cold-cathode indicator tube
- ZB – Microwave switching tube (TR/ATR cells, etc.)
- ZC – Trigger tube
- ZD – Surge arrester
- ZE – Glow modulator tube, a linear light source for rotating-drum FAX receivers, film soundtrack recording, etc.
- ZF – Flashtube
- ZL – Gas laser
- ZM – Cold-cathode character display tube or counter display tube
- ZP – Radiation detector tube (Geiger-Müller counter tube or proportional counter tube)
- ZQ – Mixed analogue and digital plasma display
- ZR – Plasma display panel
- ZS – Plasma bar graph display
- ZT – Thyratron
- ZX – Ignitron
- ZY – Mercury-vapor rectifier
- ZZ – Voltage-regulator tube
Then follows a 4-digit sequentially assigned number.
Optional suffixes for camera tubes:
Variant letter:
- B – Blue channel
- G – Green channel
- L – Luminance channel
- R – Red channel
- T – Reticule
- X – Matched to medical X-ray image intensifiers with P11 or P20 phosphors
Letter for variants derived by selection:
- D – High resolution
- M – Blemish standard
For examples see below
Transmitting tubes
The first letter (or letter pair, in the case of a dual-system device) indicates the general type:
- B – Backward-wave amplifier
- D – Vacuum, mercury-vapor or xenon rectifier including grid-controlled types
- J – Magnetron
- K – (Reflex-)Klystron
- L – Traveling-wave tube
- M – AF Power triode for use as amplifier or modulator
- P – Power pentode
- Q – Power tetrode
- R – Telefunken "R" system legacy rectifier:
- RG, RGQ – Half wave mercury-vapor rectifier
- RGQZ – Full wave mercury-vapor rectifier
- RR – Inert-gas filled half wave rectifier
- RSQ – Grid controlled half wave mercury-vapor rectifier
- RY – Vacuum half wave rectifier
- T – RF Power triode for use as amplifier or oscillator
- X – Hydrogen, mercury-vapor or inert-gas thyratron
The following letter indicates the filament or cathode type, or the fill gas or other construction detail. The coding for vacuum devices differs between Philips (and other Continental European manufacturers) on the one hand and its Mullard subsidiary on the other.
—Philips vacuum devices:
- A
- —Microwave tubes: Output power <1W; signal device for use as intermediate amplifier or low-noise receiver front end
- —Other tubes: Directly heated tungsten filament
- B
- —Microwave tubes: Output power ≥1W; power device for use in transmitters
- —Other tubes: Directly heated thoriated tungsten filament
- C – Directly heated oxide-coated filament
- D – Disk-seal construction
- E – Indirectly heated oxide-coated cathode
—Mullard vacuum devices:
- N – External magnet required (Magnetrons)
- P – Packaged construction (Magnetrons)
- S – Reflex Klystron
- T – Multiple resonator (Klystrons)
- V – Indirectly heated oxide-coated cathode
- X – Directly heated tungsten filament
- Y – Directly heated thoriated tungsten filament
- Z – Directly heated oxide-coated filament
—Gas-filled devices:
- G – Mercury-vapor filling, directly heated oxide-coated filament
- H – Hydrogen filling
- R – Inert-gas filling
- X – Xenon filling
The next letter indicates the cooling method or other significant characteristic:
- H – Helix or other integral cooler
- L – Forced-air cooling
- Q – Shield-grid (tetrode) thyratron
- S – Silica envelope, to allow for a glowing anode
- T – Tunable microwave device
- W – Water cooling
The following group of digits indicate:
- —Microwave tubes: Frequency in GHz
- —Rectifying tubes: DC output voltage in kV
- —Thyratrons: Peak inverse voltage in kV
- —Transmitting tubes: Maximum anode voltage in kV
- A leading 0 means a voltage below 1 kV, the following digit(s) then being the fractional part
Then a delimiter:
- / (slash) – Philips device (used throughout this list)
- - (dash) – Mullard device
The following group of digits indicate:
- —Rectifiers: Maximum average anode current in mA, or anode dissipation, or useful output power in W, at rated voltage
- —Continuously transmitting tubes: Maximum anode dissipation in W or kW in Class-C amplifier telegraphy
- —Pulsed transmitting tubes: Maximum peak anode current in A, preceded by the letter P
- —Thyratrons: Maximum average anode current:
- 2 digits: in A
- 3 or more digits: in mA
- —Backward-wave amplifiers or Traveling-wave tubes: Output power:
- 2nd letter: A – in mW
- 2nd letter: B – in W
- —Klystrons: Output power in W
- —Reflex Klystrons: Output power in mW
- —Magnetrons: Pulse output power in kW
An optional following letter indicates the base or connection method:
- B – Cables
- E – Medium 7-pin base
- ED – E27 Edison screw lamp base
- EG – E40 Goliath Edison screw lamp base
- F – Medium 8-pin base
- G – Medium 4-pin base
- GB – Jumbo 4-pin base
- GS – Super jumbo 4-pin base
- N – Medium 5-pin base
- P – Side-contact base
For examples see below
Phototubes and photomultipliers
The first digit indicates the tube base:
- 2 – Loctal 8-pin base
- 3 – Octal 8-pin base
- (1)5, 6 – Miscellaneous
- 8 – Noval base
- 9 – Miniature 7-pin base
The second digit is a sequentially assigned number.
The following letter indicates the photocathode type:
- A – S11, Caesium-activated antimony cathode. Used for reflective-mode photocathodes. Response range from UV to visible, peak sensitivity 420 nm. Widely used
- C – S1, Caesium-on-oxidated-silver cathode. Transmission-mode, sensitive from 300...1200 nm, peak at 800 nm. High dark current; used mainly in near-IR, with the photocathode cooled
- D – S24, Bialkali potassium-antimony-caesium cathode, spectral response from UV to red
- DU – "D" with a Silica window for UV detection
- S – Semiconductor, i.e. photoresistor
- SBU – Solar-blind caesium-telluride cathode, spectral response from UV-B to Vacuum UV, peak sensitivity 235 nm (UV-C), Silica window
- T – S20, Trialkali sodium-potassium-antimony-caesium cathode, wide spectral response from UV to near-IR; special cathode processing can extend range to 930 nm, then referred to as S25. Used in broadband spectrophotometers
- TU – "T" with a Silica window for UV detection
- U –
- S13, "A" with a Silica window for UV detection, peak sensitivity 400 nm, or
- Flame detector tube, a solar-blind, UV-triggerable gas-filled cold-cathode switching diode which itself emits UV when triggered (cf. Geiger-Müller tube)
The following letter indicates the filling:
- G – Gas-filled
- V – High-vacuum
- VP – Photomultiplier
Examples:
- 20AV – Vacuum phototube, blue sensitive, B8G Loctal base
- 20CG – Gas-filled phototube, Red/IR sensitive, B8G Loctal base
- 20CV – Vacuum phototube, Red/IR sensitive, B8G Loctal base
- 57CV – Vacuum photometric cell, Red/IR sensitive, British 4-pin base
- 58CG – Gas-filled phototube, Red/IR sensitive, all-glass wire-ended
- 58CV – Vacuum phototube, Red/IR sensitive, all-glass wire-ended
- 90AG – Gas-filled phototube, daylight/blue sensitive, Miniature 7-pin base
- 90AV – Vacuum phototube, blue sensitive, Miniature 7-pin base
- 90CG – Gas-filled phototube, Red/IR sensitive, Miniature 7-pin base
- 90CV – Vacuum phototube, Red/IR sensitive, Miniature 7-pin base
- 92AG – Gas-filled phototube, blue sensitive, Miniature 7-pin base
- 92AV – Vacuum phototube, blue sensitive, Miniature 7-pin base
- 150AV – Vacuum photometric cell, blue sensitive
- 150CV – Vacuum photometric cell, Red/IR sensitive
- 150TV – Vacuum photometric cell, blue sensitive
- 150UV – Vacuum photometric cell, Blue/UV sensitive
- 155UG – Gas-filled, cold-cathode, 200...290 nm UV sensitive flame detector tube, direct operation from 220VAC mains, Noval base with only 4 pins[36]
- 61SV/7634, 62SV – PbS infrared (300...3500 nm) photoresistor, all-glass with 2 wire-ends
- 50AVP – 11-stage photomultiplier for scintillation counters, Duodecal base
- 51UVP – 11-stage photomultiplier, Duodecal base
- 52AVP = XP1180 – 10-stage photomultiplier, 13-pin base
- 53AVP, 153AVP – 10-stage photomultiplier, Diheptal 14-pin base
- 53UVP – 11-stage photomultiplier, Diheptal 14-pin base
- 54AVP – 11-stage photomultiplier, Diheptal 14-pin base
- 55AVP – 15-stage photomultiplier, Bidecal 20-pin base
- 56AVP – 14-stage photomultiplier, Bidecal 20-pin base
- 56DVP, 56DUVP – 12-stage photomultiplier, Bidecal 20-pin base
- 56SBUVP – 14-stage photomultiplier, Bidecal 20-pin base
- 56TVP, 56TUVP – 12-stage photomultiplier, Bidecal 20-pin base
- 56UVP – 14-stage photomultiplier, Duodecal base
- 57AVP – 11-stage photomultiplier, Bidecal 20-pin base
- 58AVP – 14-stage photomultiplier, Bidecal 20-pin base
- 60DVP, 60DVP/H (with plano-concave glass adaptor) – 12-stage photomultiplier for scintillation counters
- 150AVP – 10-stage photomultiplier, Bidecal 20-pin base
- 150CVP – 10-stage photomultiplier, Bidecal 20-pin base
Voltage-regulator tubes
The first number indicates the burning voltage
The following letter indicates the current range:
- A – max. 10 mA
- B – max. 22 mA
- C – max. 40 mA
- D – max. 100 mA
- E – max. 200 mA
The following digit is a sequentially assigned number.
An optional, following letter indicates the base:
- E – Edison screw lamp base
- K – Octal base
- P – Side-contact base
Examples:
- 70B1 – Voltage-regulator tube, all-glass wire-ended
- 75B1 – Voltage-regulator tube, Miniature 7-pin base
- 75C1 – Voltage-regulator tube, Miniature 7-pin base
- 83A1 = 7980 – Voltage-regulator tube, Miniature 7-pin base
- 85A1 = 0E3 – Voltage-regulator tube, B8G Loctal base
- 85A2 = 0G3 – Voltage-regulator tube, Miniature 7-pin base
- 90C1 – Voltage-regulator tube, Miniature 7-pin base
- 95A1 – Voltage-regulator tube, Miniature 7-pin base
- 100E1 – Voltage-regulator tube, A4A European 4-pin base
- 108C1 = 0B2 – Voltage-regulator tube, Miniature 7-pin base
- 150A1 – Voltage-regulator tube, P8A side-contact 8 base
- 150B2 = 6354 – Voltage-regulator tube, Miniature 7-pin base
- 150B3 – Voltage-regulator tube, Miniature 7-pin base
- 150C1 – Voltage-regulator tube, P8A side-contact 8 base
- 150C2 = 0A2 – Voltage-regulator tube, Miniature 7-pin base
- 150C4 – Voltage-regulator tube, Miniature 7-pin base
BVA code
Little is known about this code other than that BVA 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;[12][37] not to be confused with Compagnie des Lampes (1921, "French Mazda", see below). This system was also used by the British ETA[38]
First letter: Heater or filament voltage
- A – 1 V
- B – 2 V
- D – 4 V
- E – 5 V
- F – 6 V
- G – 7 V
Second letter: Heater or filament current
- W – ≥200 mA
- X – 150 mA
- Y – 100...140 mA
- Z – 50 mA
Next number: Gain (amplification factor) μ
Next number: Internal resistance in kΩ
Examples:
- BW604 – Métal secteur indirectly AC-heated AF power triode[39]
- BW1010 – Métal secteur indirectly AC-heated AF triode[40]
Cossor system
- An optional number: Heater voltage[12]
- 4, 40–49, 400–499 – 4 V, Mostly indirect, heater
- Note: Some tubes in the low 40s and 400s have a 40 V indirect heater
- 13 – 13 V Indirect heater
- 200–299 – 2 V heater
- 600–699 – 6 V Indirect heater
- 800–899 – 7.5 V Indirect heater
- Letter(s): System type (derived from the BVA code)
- Note: A preceding letter M indicates a 4-volts AC, indirectly heated ("Mains Operated") tube
- B – Dual power triode
- BU – Full-wave rectifier
- DD – Dual diode
- DDT, DHA – Dual diode + triode
- DET – Detector
- DG – Tetrode
- DP – Power triode
- HF, HL, LH – Signal triode
- HPT – Power pentode
- LF – AF triode
- P – Power triode or pentode
- PA – Power triode
- PG, PGA – Heptode pentagrid converter
- PPA – Power pentode
- PT – Power pentode
- RC – Triode
- SG – Sharp-cutoff tetrode
- SPA, SPT – Sharp-cutoff RF pentode
- SU, SUA – Half-wave rectifier
- VPA, VPT – Remote-cutoff RF pentode
- VS, VSG – Remote-cutoff tetrode
- XP – Power triode
- An optional number if none preceded the letters
- Examples:[41]
- 4XP – 4 volts, directly heated power triode
- 41MDG – 4 volts tetrode
- 41MP – 4 volts, indirectly heated, power triode
- 41MPG – 4 volts, indirectly heated, heptode pentagrid
- 41MXP – 4 volts, indirectly heated, power triode
- 210DET – 2 volts, directly heated, detector triode
- 210HF – 2 volts, directly heated, triode
- 210HL – 2 volts, directly heated, triode
- 210LF – 2 volts, directly heated, triode
- 210PG – 2 volts, directly heated, remote-cutoff heptode pentagrid
- 210RC – 2 volts, directly heated, very high-μ triode
- 210SPT – 2 volts, directly heated, sharp-cutoff RF pentode
- 210VPT – 2 volts, directly heated, shielded remote-cutoff RF pentode
- 215P – 2 volts, directly heated AF power triode
- 220B – 2 volts, directly heated dual power triode (not to be confused with the Western Electric 220B single power triode)
- 220PA – 2 volts, directly heated power triode
- 220PT – 2 volts, directly heated power triode
- 230XP – 2 volts, directly heated power triode
- 240B – 2 volts, directly heated dual AF power triode (not to be confused with the Amperex 240B single power triode)
- 402P – 40 volts, indirectly heated power triode, 7-pin base
- 410HF – Triode
- 610RC – 6 volts, directly heated signal triode
- 660SU – 6 volts, directly heated 1 kV, 150 mA half-wave rectifier
- 825BU – 7.5 volts, directly heated 500 V, 120 mA full-wave rectifier
- DDT – 4 volts, indirectly heated dual diode + triode
- DP – 16 volts, indirectly heated power triode
- PT41 – 4 volts, directly heated power pentode
- SU25 – 25 kV, 1 mA EHT rectifier
- SU2150 (CV1120) – 8 kV, 2 mA EHT rectifier for use in CRT power supplies
EdiSwan ("British Mazda") systems
EdiSwan (British Mazda) is not to be confused with other licensees of General Electric's Mazda brand:
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EdiSwan used the BVA code first, then devised the system below but also used the Mullard–Philips scheme
Signal tubes
First number: Heater or filament rating[44]: 6
- 0 – Misc. higher voltages
- 1 – 1.4 V
- 6 – 6.3 V
- 10 – 100 mA
- 20 – 200 mA
- 30 – 300 mA
Following letter or letter sequence: Type
- C – Triode/pentode, triode/hexode or triode/heptode mixer
- D – Signal diode(s)
- F – Tetrode or pentode
- FD – Tetrode+diode(s) or pentode+diode(s)
- FL – Tetrode+triode or pentode+triode
- K – Small gas triode or tetrode thyratron
- L – Single or dual triode, including oscillator triode
- LD – Triode + diode(s)
- M – Optical tuning/level indicator
- P – Power tetrode or pentode
- PL – Signal triode + power tetrode or pentode
Final number: Sequentially assigned number
Examples:
Note: The (mostly BVA-coded) "AC/"-series receiver tubes are listed under other letter tubes - AC/
- 6C10 (6CU7/ECH42) – Triode/hexode mixer, Rimlock base
- 6F22 = 6BK8/6CF8/EF86 (6267) – Low-noise AF pentode, Noval base
- 6F33 – Shielded pentode, Miniature 7-pin base
- 6FL2 = ECF812 – Triode + low-power beam tetrode, Noval base; 30FL2 (=PCF812) with a different heater
- 6L12 (6AQ8/ECC85) – Dual triode, Noval base
- 6L19 – Dual triode, Rimlock base
- 6M2 (6CD7/EM34) – Dual-sensitivity tuning indicator, 8-pin Octal base
- 6P9 = 6BM5 – Power pentode, Miniature 7-pin base
- 6P15 (6BQ5/EL84) – Power pentode, Noval base
- 10M2 = UM35 (UM4) – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator
- 10PL12 (50BM8/UCL82) – Triode + power pentode, Noval base
- 30C17 = PCF87 – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers
- 30FL2 = PCF812 – Triode + low-power beam tetrode, Noval base; 6FL2 (=ECF812) with a different heater
- 30PL13 = PCL800 – Triode + power pentode
- 30PL14 = PCL88 – Triode + power pentode
Power tubes
Letter(s): Type
- ES, ESA, ESV, ESW – Power triode
- ESG – Power tetrode
- ESU, U – Half-wave high-vacuum or gas-filled rectifier
- UU – Full-wave high-vacuum rectifier
- T – Thyratron
Number:
- —Vacuum power tubes: Anode dissipation in W
- —Other tubes: Sequentially assigned number
Examples:
- ES75 (μ = 5), ES75H (μ = 11) – 1 kV, 75 W AF Power triode
- ES250M – 2 kV, 250 W AF Power triode
- ES1101 – 1.25 kV, 40 W AF Power triode
- ES1102 – 1.25 kV, 100 W AF Power triode
- U26 = 2J2/KY80 – CRT EHT rectifier, Noval base
- U381 (38A3/UY85) – Half-wave rectifier, Noval base
- UU9 (6BT4/EZ40) – Full-wave rectifier, Rimlock base
EEV system
This system consists of one or more letters followed by a sequentially assigned number[45]
- A – High-vacuum rectifier
- AFX – Rare gas filled triode thyratron
- AH – Mercury-vapor rectifier
- AX – Xenon filled rectifier
- B – Radiation-cooled triode
- BD – Mercury-vapor rectifier
- BK – Ignitron
- BM – Magnetron
- BR – Forced-air cooled triode
- BS – TR (Transmit/receive) cell, TB cell, Solid-state microwave device
- BT – Mercury-vapor or xenon filled thyratron
- BW – Water-cooled triode
- BY – Vapor-cooled triode
- C – Radiation-cooled tetrode
- CR – Forced-air cooled tetrode
- CW – Water-cooled tetrode
- CX – Hydrogen tetrode thyratron
- E – Storage tube
- FX – Hydrogen triode thyratron
- GX – Spark gap
- K – Klystron
- M – Magnetron
- NFT – Nernst filament, a source of mid-infrared radiation
- P – Video camera tube
- QS – Voltage-regulator tube
- QT – Cold-cathode trigger tube
- T – CRT
- U – Vacuum capacitor
- XL – Glow modulator tube, flashtube, gas laser
Examples:
- B142 – 400 W RF power triode up to 50 MHz similar to 833A
- B1109 = 3C24 – 25 W VHF power triode up to 60 MHz
- B1135 = 5867 = CV1350 – VHF power triode up to 100 MHz
- B1152 – 500W RF power triode up to 50 MHz
- 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, linear light source (glow modulator tube), gas diode with a blue-violet glow, modulation up to 1 MHz, 8-pin base, for rotating-drum FAX receivers, etc.
ETL computing tubes system
The British Ericsson Telephones Limited (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:
- An initial letter denoting the filling:
- G – Gas-filled
- V – Vacuum
- One letter denoting the type:
- C – Common cathode Counter Dekatron that makes only carry/borrow cathodes separately available for cascading
- D – Diode, voltage-regulator tube, etc.
- PE – Trigger pentode, two starter electrodes and a keep-alive (primer) electrode for ion availability
- R – Register (Readout) – Digital indicator
- S – Trochotron or separate cathodes Counter/Selector Dekatron that makes all cathodes available on individual pins for displaying, divide-by-n counter/timer/prescalers, etc.
- TE – Trigger tetrode, one starter electrode and a keep-alive electrode
- TR – Trigger triode, one starter electrode only
- A digit group:
- —Dekatrons: Stage count
- —Digital indicators: Display cathode count
- —Diodes, voltage-regulator tubes: Nominal voltage
- —Trigger tubes: Ignition voltage
- An optional digit group after a slash: Accessible cathodes count
- One letter denoting the type:
- A to F – British 4-pin, K8A Octal, B12A Duodecal phenolic bases
- G to T – All-glass tubes with B7G Miniature 7-pin, B9A Noval, B13B, B17A, B26A, B27A bases
- W to Z – All-glass wire-ended tube
- An optional suffix:
- /M – Trochotron with magnetic shielding
- R – Shock/vibration-resistant
- /S – Tested to military specs
Examples:
- GC10/2P – Neon-filled, 1 kHz miniature decade Counter Dekatron, a gas-filled, bidirecional decade counter tube
- GC10A – Helium-filled, decade Counter Dekatron
- GC10B – Neon-filled, 4 kHz long-life, decade Counter Dekatron
- GC10/4B – 4 kHz Decade Computing Counter Dekatron with carry/borrow cathodes "0" and "9" and intermediate cathodes "3" and "5" wired to separate pins
- GC10D – 20 kHz Decade Counter Dekatron, for single-pulse operation
- GC12/4B – 4 kHz Duodecimal Counter Dekatron with carry/borrow cathodes 11 and 12 and intermediate cathodes 6 and 8 wired to separate pins
- GCA10G – 10 kHz max. Decade Counter Dekatron with routing guides and aux anodes to directly drive Nixie tubes, B27A base without the inner pin ring
- GD2V – 2 kV, 16 J discharge tube, all-glass studded
- GD75P – 75 V Voltage-regulator tube, Miniature 7-pin base
- GD90M – 90 V Voltage-regulator tube, Miniature 7-pin base
- GD340X – 345 V/3...200 µA Corona voltage-regulator tube, all-glass wire-ended
- GD350X, GD350Y – 350 V/3...200 µA Corona voltage-regulator tube, all-glass wire-ended
- GD550W – 550 V, 1.5 J Discharge tube, e.g. for power relaxation oscillators, all-glass wire-ended
- GDT120M – 9 mA Gas-filled cold-cathode DC triode, one starter and a separate glow diode acting as an optical primer, Miniature 7-pin base
- GR2G – + - Neon-filled digital indicator tube, 18 × 18 mm characters, side-viewing
- GR2H – + - Neon-filled digital indicator tube, 20 × 20 mm characters, top-viewing
- GR4G – ¼ ½ ¾ 1 Neon-filled digital indicator tube, 18 × 30 mm characters, side-viewing
- GR7M – + - V A Ω % ~ Neon-filled digital indicator tube, 15.5 mm character height, top-viewing
- GR10A – Gas-filled digital indicator tube with a dekatron-type readout
- GR10G – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 16.86 × 30 mm characters, side-viewing
- GR10H – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 12 × 19 mm characters, top-viewing
- GR10J – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 16.86 × 30 mm characters, side-viewing
- GR10K – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 12 × 19 mm characters, top-viewing
- GR10M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 10 × 15.5 mm characters, top-viewing
- GR10W – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 8.42 × 15 mm characters, side-viewing, all-glass wire-ended
- GR12G – A B C D E F G H I J K L Neon-filled digital indicator tube, 16 × 30 mm characters, side-viewing
- GR12H – E L M N P R S T U V W X Neon-filled digital indicator tube, 16 × 30 mm characters, side-viewing
- Note: More Nixie tubes under standard - ZM and professional - ZM
- GS10C – 4 kHz max. Decade Counter/Selector Dekatron, top-viewing, Duodecal base
- GS10D – Hydrogen-filled, 20 kHz max. Decade Counter/Selector Dekatron, Duodecal base
- GS10H – 4 kHz max. Decade Counter/Selector Dekatron with routing guides, B17A base
- GS12C – 4 kHz max. Duodecimal Counter/Selector Dekatron, with solder lugs
- GS12D – Neon-filled, 4 kHz max. duodecimal Counter/Selector Dekatron, Duodecal base with 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 primer, all-glass wire-ended
- GTE130T – 8 mApeak DC trigger tetrode, one starter and one primer, close tolerance, low aging, quadrant I operation only, Noval base
- GTE175M – 3.5 mAavg, 50 mApeak DC Trigger tetrode, one starter and one primer, Miniature 7-pin base, for Dekatron coupling circuits
- GTR120W – 9 mA Subminiature DC trigger triode, all-glass with 3 wire-ends, for computer applications
- GTR75M – 75 V Voltage-regulator tube, Miniature 7-pin
- GTR95M/S – 95 V Voltage-regulator tube, Miniature 7-pin
- GTR150 – Subminiature, primed 150 V voltage-regulator tube, all-glass wire-ended
- VS10G – Trochotron, an electron beam decade counter tube
- VS10G-M – VS10G with a magnetic shield
- VS10H – High-current trochotron
- VS10K – Low-voltage trochotron
Marconi-Osram system
The British GEC-Marconi-Osram (M-OV) designation from the 1920s uses one or two letter(s) followed by a number and sometimes by a second letter identifying different variants of a particular type[12]
Optional preceding letter(s):
- DE – Dull Emitter tube[27]: 198ff
- G – Gas or mercury-vapor filled tube
- GX – Xenon-filled tube
- M –
- A 4-volts AC, indirectly heated ("Mains Operated") tube, and/or
- A Marconi tube with an M-P designation
- Q – Special quality tube
- V – Vari-μ = remote-cutoff tube
The letter(s) generally denote the type or use (derived from the BVA code):
- A – General professional tube
- B – Dual triode
- D – Dual diode
- DA – More than 25 W power triode
- H – High-μ signal triode
- KT – Beam power tetrode ("Kinkless Tetrode")
- KTW – Remote-cutoff beam tetrode
- KTZ – Sharp-cutoff beam tetrode
- L – Low-μ signal triode
- LP – Power triode
- N – Power pentode
- P – Power triode up to 3 W
- PT – Power pentode
- PX – 3...25 W Power triode
- QP – Dual pentode
- S – Tetrode
- SP – Pentode
- T – (Gas/vapor-filled) triode
- U – Gas/vapor-discharge or vacuum rectifier
- W – Remote-cutoff pentode
- X – Triode/hexode mixer
- Y – Optical tuning/level indicator
- Z – Sharp-cutoff RF pentode
In most cases, the first digit of the following number is the heater rating:
- 2 – 2 V
- 3 – 13 V or 300 mA
- 4 – 4 V
- 5 – 5 V (Rectifiers)
- 6 – 6 V
Examples:
- A1834 = 6AS7G/ECC230 = CV2523 – Dual power triode (series regulator), Octal base
- B30 – Dual Class-B power triode
- B309 = 12AT7/ECC81 – Dual high-μ triode. Commonly used as RF amplifier/mixer in VHF circuits
- B719 = 6AQ8/ECC85 – Dual RF triode, RF amp & mixer in FM receivers, Noval base
- D41 = EdiSwan V914 – Indirectly heated, dual detector diode, British 5-pin base
- D42 – Indirectly heated, single detector diode, British 4-pin base
- DA30 – AF power triode, Pa=30 W
- DA40 – AF power triode, Pa=40 W
- DA41 – AF power triode, Pa=50 W
- DA60 – AF power triode, Pa=60 W
- DA100 – AF power triode, Pa=100 W
- DA250 – AF power triode, Pa=250 W
- GT1 – Mercury vapor-filled, 1 kV, 300 mAavg, 500 mARMS, 1 Apeak thyratron, 4 V/1.3 A heater, O5A European 5-pin base
- GT1A – Argon-filled, 300 V, 200 mAavg, 300 mARMS, 600 mApeak version of GT1
- GT1C = AN1 – Argon-filled, 500 V, 300 mAavg, 500 mARMS, 1 Apeak version extensively used in the Colossus computer
- GU21 = EnglishElectricValve AH221 = Mullard RG4/1250 – Half-wave mercury-vapor rectifier, E40 Goliath Edison screw lamp base
- H11, H12 – Directly heated miniature AF triodes, 2 V/60 mA filament, for use in hearing aids; cf. KC50, KC51, Mullard DA1
- H63 = 6F5 – High-μ triode, Octal base
- H610 – Directly heated, high-μ AF triode, British 4-pin base
- HA1 (4 V heater), HA2 (6.3 V heater) – Acorn UHF triodes up to 600 MHz
- KT2 – 1 W Beam power tetrode, British 5-pin base, 2 V/200 mA filament
- KT21 – 1.25 W Beam power tetrode, British 5-pin base, 2 V/300 mA filament
- KT32 – 7.5 W Beam power tetrode, Octal base, 26 V/300 mA heater for use in AC/DC radio receivers with series heater strings; drop-in replacement for the 25L6, 25W6GT
- KT33 (25A6GT) – 5 W Beam power tetrode, Octal base, 26 V/300 mA heater for use in AC/DC radio receivers with series heater strings
- KT33C – KT33 with a center-tapped heater, so it can also be wired for 13 V/600 mA
- KT36 – 10 W Beam power tetrode, Octal base, 26 V/300 mA heater for use in AC/DC radio receivers with series heater strings
- KT41 – 8.6 W Beam power tetrode, British 7-pin base, 4 V/2 A heater
- KT55 – 25 W Beam power tetrode, Octal base, 52 V/300 mA heater for use in AC/DC radio receivers with series heater strings
- KT61 (6M6G, EL33) – 4.3 W Beam power tetrode, Octal base, 6.3 V/950 mA heater
- KT63 – 6 W Beam power tetrode, Octal base, 6.3 V/700 mA heater; drop-in replacement for the 6F6 power pentode
- KT66 – 7.25 W Beam power tetrode, Octal base, 6.3 V/1.27 A heater; drop-in replacement for the 6L6GC
- KT67 – 25 W RF beam power tetrode, B9G 9-pin Loctal base, 6.3 V/1.5 A heater
- KT71 (50L6GT) – 5 W Beam power tetrode, Octal base, 48 V/160 mA heater for use in AC/DC radio receivers with series heater strings
- KT77 – 30 W Beam power tetrode, Octal base, 6.3 V/1.4 A heater; 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, Octal base, 6.3 V/1.6 A heater
- KTW21 – Remote-cutoff RF/IF beam tetrode, 4-pin base with control grid on top cap, 2 V/100 mA filament; upgrade to the older W21
- KTW61, KTW62 – Remote-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/300 mA heater; upgrade to the older W61
- KTW61M – KTW61 with a metal particles spray-shielded envelope
- KTW63 – Remote-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/300 mA heater; upgrade to the older W63
- KTW73, KTW73M (Spray-shielded) – Remote-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/160 mA heater
- KTZ41 – Sharp-cutoff RF/IF beam tetrode, British 7-pin base with control grid on top cap, 4 V/1.5 A heater
- KTZ61 – Sharp-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/300 mA heater
- KTZ63 – Sharp-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/300 mA heater; upgrade to the older Z63, beam variant of 6J7G/EF37 with suppressor plates tied to cathode, not to a separate pin
- KTZ73, KTZ73M (Spray-shielded) – Sharp-cutoff RF/IF beam tetrode, Octal base with control grid on top cap, 6.3 V/160 mA heater
- L11, L12 – Directly heated miniature AF power triodes, 2 V/60 mA filament, for use in hearing aids; cf. KD50, Mullard DA2, DA3
- L63 = 6J5 – Low-μ triode, Octal base
- L610 – Directly heated, low-μ RF triode, British 4-pin base
- MKT4 – 3.2 W Beam power tetrode, indirect 4 V/1 A heater, British 5 or 7-pin base
- MU12 = EdiSwan UU4 (350 V), MU14 = UU5 = Mullard IW4-500 (500 V) – Full-wave rectifier, indirect 4 V/2.5 A heater, British 4-pin base
- MX40 – Heptode pentagrid converter with an indirect 4 V/1 A heater and a British 7-pin base with #4 grid on top cap; similar to the Mullard FC4 octode
- N77 = 6AM5/EL91, N78 = 6BJ5 – Power pentodes, Miniature 7-pin base
- N309 = 15A6/PL83 – CRT cathode drive power pentode
- P425 = Mullard PM254 – Power triode with a 4 V/200 mA battery heater and a British 4-pin base
- P610 – Directly heated AF power triode, British 4-pin base
- P625 – AF power triode
- PX4 – Directly heated AF power triode designed in the 1930s. Capable of providing about 4.5 W of audio
- PX25 – Directly heated AF power triode designed in the 1930s. Capable of providing about 25 W of audio
- QP21 – Directly heated dual AF power pentode, British 7-pin base
- QP240 – Directly heated dual AF power pentode, British 9-pin base
- S12 – Directly heated miniature AF tetrode, 2 V/60 mA filament, for use in hearing aids; cf. KE50, Mullard DAS1
- S610 – Directly heated sharp-cutoff RF tetrode, British 4-pin base
- U52 = 5AS4A/5U4GB – Full-wave rectifier, Octal base
- VS24 – Directly heated remote-cutoff RF tetrode, British 4-pin base
- W727 = 6BA6/EF93 (5749) – Remote-cutoff RF pentode, Miniature 7-pin base
- X41 – Triode/hexode mixer up to 60 MHz, designed as a drop-in replacement for the MX40 pentagrid converter
- X41c – X41 with a ceramic base for better frequency stability in VHF Band I TV tuners
- X61, X61M = 6J8G – British triode/heptode mixer, Octal based
- X63 = 6A8 – Heptode pentagrid converter, Octal based
- X727 = 6BE6/EK90 (5750) – Pentagrid converter, Miniature 7-pin base
- Y61, Y63 = 6U5G = Mullard VI103 – Tuneray optical tuning/level indicator, Octal base; similar to 6G5
- Z77 = 6AM6/EF91 – Sharp-cutoff RF pentode, Miniature 7-pin base
- ZA1 (4 V heater), ZA2 (6.3 V heater) – Acorn sharp-cutoff pentodes
Marconi also traded some Mullard-Philips tubes, with a preceding letter M: MAZ1, MAZ41, MCL4, MCY1, MCY2, MDAC21, MDAF40, MDAF41, MDF21, MDK21, MDK40, MDL21, MDL41, MDM21, MEB4, MEBC3, MECH3, MECH21, MECH42, MEF5, MEF6, MEF9, MEK2, MEL3, MEL41, MEM1, MEM34, MKBC1, MUBC41, MUCH42, MUF9, MUF41, MUL41, MUM4, MUY41
Media related to Marconi vacuum tubes at Wikimedia Commons
Mullard designations before 1934
Older Mullard tubes were mostly assigned PM ("Philips-Mullard"), followed by a number containing the filament voltage.
Many later tubes were assigned one to three semi-intuitive letters, followed by a number containing the heater voltage. This was phased out after 1934 when Mullard adopted the Mullard–Philips scheme.
Examples:[2]
- 2D4 – Dual Diode with a 4 V/650 mA heater and a British 5-pin base
- AP4 = Philips 4676 – Acorn UHF Pentode up to 430 MHz, 4 Volts heater
- AT4 = Philips 4675 – Acorn UHF Triode up to 430 MHz, 4 Volts heater
- DA1 (2 V/50 mA filament), DB1 (1.5 V/70 mA filament) – Directly heated miniature AF triodes for use in Deaf Aids; cf. 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) – Directly heated miniature AF power triodes for use in hearing aids; cf. DD51, KD50, M-OV/GEC L11, L12
- DAS1 (2 V/60 mA filament), DBS1 (1.5 V/70 mA filament) – Directly heated miniature AF tetrodes for use in hearing aids; cf. DF51, KE50, M-OV/GEC S12
- FC4 – Octode Frequency Converter with a 4 V/650 mA heater and a British 7-pin base with #4 grid on top cap; similar to the M-OV/GEC MX40 heptode[46]
- FC13 – FC4 with a 13 V/200 mA heater and a side-contact 8 base
- FC13C – FC13 with a British 7-pin base
- Pen20 – Power Pentode with a 20 V/180 mA heater and a British 5- or 7-pin base
- PM254 = M-OV/GEC P425 – "Super Power" triode with a 4 V/200 mA battery heater and a British 4-pin base
- TDD4 = M-OV/GEC MHD4 = EdiSwan AC/HLDD – Triode + dual Diode with a 4 V/550 mA heater and a British 7-pin base
- TH21C – Triode/Hexode mixer with a 21 V/200 mA series heater and a British 7-pin base
- TP4 = EdiSwan AC/TP – Triode + Pentode with a 4 V/1.25 A heater and a British 7-pin base
- VP2 = M-OV/GEC VP21 = VP215 – Vari-μ Pentode with a 2 V/180 mA heater and a British 7-pin base
Media related to Mullard vacuum tubes at Wikimedia Commons
Philips systems
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.[47]
Standard tubes 1925–34
The system consisted of one letter followed by 3 or 4 digits.[48]: 15 [3][28][12] It was phased out after 1934 when Philips adopted the Mullard–Philips scheme.
1st letter: Heater current
- A – 60...90 mA
- B – 100...190 mA (This designation lived on as the "B" (180 mA) in the Mullard–Philips system)
- C – 200...390 mA (This designation lived on as the "C" (200 mA) in the Mullard–Philips system)
- D – 400...690 mA
- E – 700...1390 mA
- F – 1.4...2 A
1 or 2 digit(s): Heater voltage
Last 2 digits: Type
- 00–40, 99: Triode gain (amplification factor) μ
- 41–98:
- second-last digit: sequentially assigned, starting at 4
- last digit:
- 1 – Bi-grille,[49] a tetrode with a space charge grid (the 2nd grid is the control grid)
- 2 – Tetrode with a screen grid (the 1st grid 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
Examples:[50]
- A106 – Directly heated triode, 1 V/60 mA filament, μ = 6
- A425 = RE034 = HR406 – RF triode, 4 V/60 mA filament
- A435 – Directly heated triode, 4 V/60 mA filament, μ = 35
- A441 – Directly heated tetrode with a space charge grid, 4 V/60 mA filament
- A442 = RES094 = S406 – Directly heated tetrode with a screen grid, 4 V/60 mA filament
- B409 = RE134 = L414 – Triode, 4 V/140 mA filament
- B2038 = REN1821 = R2018 = A2118 – Triode, 180 mA heater
- B2043 = RENS1823D = PP2018D = L2318D – Indirectly heated power pentode, 20 V/180 mA DC series heater
- B2044 = RENS1854 = DS2218 – Indirectly heated diode + tetrode, 20 V/180 mA DC series heater
- B2044S = REN1826 – Indirectly heated diode + triode, 20 V/180 mA DC series heater
- B2045 = RENS1819 – Indirectly heated remote-cutoff RF tetrode, 20 V/180 mA DC series heater
- B2048 = RENS1824 = MH2018 – Hexode mixer, 20 V/180 mA DC series heater
- B2099 = REN1814 – Indirectly heated triode, 20 V/180 mA DC series heater, μ = 99
- E443H = RES964 = PP4101 = L496D = RTP4 = P435 – Power pentode, 4 V heater
- E446 = RENS1284 = HP4101 – Indirectly heated RF pentode, 4 V/1.1 A heater
- E447 = RENS1294 = HP4106 – Indirectly heated remote-cutoff RF pentode, 4 V/1.1 A heater
- E448 = RENS1224 = MH4100 – Indirectly heated sharp-cutoff hexode mixer, 4 V/1.2 A heater
- E449 = RENS1234 = FH4105 – Indirectly heated remote-cutoff hexode mixer, 4 V/1.2 A heater
- F215 – Indirectly heated triode, 2.5 V/1.5 A heater, μ = 15
Numeral system
Philips also used a numeral-only system for special tubes:
- 1000 to 1899 – Rectifier
- 1700s – Gas-discharge or mercury-vapor rectifier
- 1800s – High-vacuum rectifier
- 1900s – Barretter
- 3500s – Phototube or photomultiplier
- 4000s – Misc.
- 18000 to 18099 – Telephone repeater triode or pentode
- 18100s – Image intensifier or image converter
- 18500s – Radiation detector tube (Geiger-Müller counter tube or proportional counter tube)
- 20610 to 28216 – X-ray tube
- 55000 to 55399 – Microwave tube
- 55800s – Video camera tube
- 56000s – Misc.
Examples:
- 1063A – Three-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 heater
- 1069K – Full-wave Tungar bulb for DC welding service at 60 A, 3.25 V/70 A heater, forced-air cooling
- 1533A – Three-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 heater
- 1543A – Three-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 heater
- 1553A – Three-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 heater
- 1561 – 1.4 kV, 2×80 mA Full-wave rectifier; AZ2 with a 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[8]
- 3520 – Early photomultiplier, 3-stage, Caesium-on-oxidated-silver photocathode, spectral S1 response, side-contact 8 base
- 4000s – See below
- 18503 = ZP1200
- 18504 = ZP1400
- 18505 = ZP1410
- 18506 = ZP1431
- 18507 = ZP1600
- 18509 = ZP1310
- 18511 = ZP1610
- 18515 = ZP1441
- 18518 = ZP1700
- 18520 = ZP1210
- 18525 = ZP1520
- 18526 = ZP1430
- 18529 = ZP1300
- 18536 = ZP1451
- 18545 = ZP1220
- 18546/01 = ZP1460
- 18550 = ZP1320
- 18555 = ZP1330
- 56001 – Directly heated, 300 V, 400 µA thermally-limited (=saturated) emission diode, 4.6 V/163 mAmax filament, usable as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, or as an RMS heating current-to-DC anode current converter; cf. 5845, Tesla RA0007, YA1000
- 56006 – Omegatron Mass 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[51]
Media related to Philips vacuum tubes at Wikimedia Commons
Media related to Philips gas discharge tubes at Wikimedia Commons
Basing code
From 1924 to 1939, Philips printed a basing code on tube cartons and price lists, but not on the tubes themselves.[27]: 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:
- A – 4-pin Continental European base, originally Franco-British
- B – 4-pin Telefunken base (1920s);[48]: 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 7-pin Medium American base (1930s)
- F – 4-stub American UV-199-type base
- G – 4-pin UX-type American base
- H – 3-pin Continental European base
- J – 6-pin American base
- K – Octal base
- L – 5-pin Special base[52]: 91
- M – 4-pin American WD-11-type base (1920s); later 7-pin British base (1930s)
- N – American UY base (1920s); later 5-pin American base (1930s)
- O – 5-pin Continental European base
- P – Side-contact 8 base
- Q – 7-pin Special base[52]: 91
- R – 9-pin British base[52]: 91
- S – 4-pin Subminiature hearing aid base[52]: 91
- T – 9-pin all-glass Continental European base
- U – 6-pin Special base[52]: 90
- V – Side-contact 5 base
- W – 4-pin Special base[52]: 91
- X – Acorn tube
- Y – 8-pin Continental European base, originally German steel tubes aka "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
Besides their "4000" system with incorporated Western Electric 3-digit type numbers, STC used the following system:[53]
- A number: Electrode count
- 2 – Diode
- 3 – Triode
- 33 – Dual triode
- 4 – Tetrode
- 5 – Pentode
- A letter: Type
- A – Anode dissipation below 10 W
- B – Anode dissipation 10...100 W
- C – Anode dissipation 100...1000 W
- D – Anode dissipation 1 kW or more
- J – Forced-air cooled
- Q – Water cooled
- S – Low voltage rectifier
- T – High voltage rectifier
- V – Mercury-vapor rectifier
- A slash ("/")
- Two digits: Power rating
- A digit: Sequentially assigned
- 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
For examples see below
Brimar system
Besides RETMA, EIA and Mullard–Philips systems, Brimar ("British Manufactured American Radio" [tubes]) used the following system:[12]
First number: Type
- 1 – Half-wave rectifier
- 2 – Diode
- 3 – Power triode
- 4 – High-μ triode
- 5 – Sharp-cutoff tetrode
- 6 – Remote-cutoff tetrode
- 7 – Power or video pentode
- 8 – Sharp-cutoff RF pentode
- 9 – Remote-cutoff RF pentode
- 10 – Dual diode
- 11 – Dual diode + triode
- 12 – Dual diode + AF pentode
- 13 – Dual high-μ triode
- 14 – Dual Class-B power triode
- 15 – Heptode
- 16 – DC-coupled power triode
- 17 – Dual diode + RF pentode
- 18 – Triode + pentode
- 20 – Triode/hexode or triode/heptode mixer
Next letter: Heater rating
- A – 3.6 to 4.4 V Indirectly heated
- B – 2 V Directly heated
- C – Directly heated other than 2 or 4 V
- D – All other heater ratings, indirectly heated other than 4 V
Number: Sequentially assigned number
Examples:
- 1D6 – Indirectly heated, half-wave rectifier, British 5-pin base
- 4D1 – Indirectly heated triode, British 7-pin base
- 7A3 – Indirectly heated power pentode, British 7-pin base
- 8A1 – Indirectly heated RF sharp-cutoff pentode, British 5-pin base with anode on top cap
- 9A1 – Indirectly heated RF/IF remote-cutoff pentode, British 5-pin base with anode on top cap
- 10D1 – Indirectly heated, common cathode dual diode, British 5-pin base
- 11A2 – Indirectly heated, common cathode dual diode + triode, British 7-pin base
- 13D3 – Indirectly heated, common cathode dual triode, Noval base
- 15A2 – Indirectly heated, heptode pentagrid converter, British 7-pin base
- 20D4 – Indirectly heated, triode/heptode mixer, Noval base
Valvo system before 1934
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.
First letter(s): Type[54]
- A – Triode
- AN – Binode, a diode+triode or diode+tetrode
- G – Rectifier
- H – RF tube
- L – Power tube
- LK – Power amplifier
- U – Triode with a space charge grid
- W – Triode for resistor-coupled amplifiers
- X – Hexode
Number:
- If the first digit is 4, the tube has a 4 V heater
- Otherwise, the last two digits give the heater current in tens of mA.
A following letter D indicates more than one grid, not counting a space charge grid
Examples:[50]
- A2118 = B2038 = REN1821 = R2018 – Triode, 180 mA (=18 × 10 mA) heater
- H2018D = B2042 = RENS1820 = S2018 – RF Tetrode, 180 mA heater
- L496D = E443H = RES964 = PP4101 = RTP4 = P435 – Power pentode, 4 V heater
- L2318D = B2043 = RENS1823D = PP2018D – Power pentode, 180 mA heater
Media related to Valvo vacuum tubes at Wikimedia Commons
Media related to Valvo gas discharge tubes at Wikimedia Commons
East European systems
Lamina transmitting tubes system
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.
The first letter indicates the tube type, two equal letters denoting a dual tube:
- P – Pentode
- Q – Tetrode
- T – Triode
A group of digits represents the maximum anode power dissipation in kW
An optional letter specifies the cooling method:
- <none> – Radiation
- P – Forced-air
- W – Water
The first of the two digits after the "/" sign means:
- 1 – Tube for radio broadcasting and radiocommunication equipment
- 2 – Tube for industrial equipment
- 3 – Tube used in TV broadcasting equipment
- 4 – Tube for radiocommunication equipment with unbalanced modulation
- 5 – Modulator or pulse tube
The second digit after the "/" is sequentially assigned.
Examples:
- Q01 – Power tetrode up to 125 MHz, 0.1 kW (=100 W)
- Q3.5 – Power tetrode up to 220 MHz, 3.5 kW
- QQ-004/11 – Dual beam power tetrode up to 500 MHz, 0.04 kW (=40 W)
- T01 – Power triode up to 200 MHz, 135 W
- T015/21 – Power triode up to 150 MHz, 150 W
- T02 – Power triode up to 60 MHz, 200 W
- T05P/31 – Forced-air cooled power triode up to 1 GHz, 1 kW
- T2/22 – Power triode up to 60 MHz, 3 kW
- T6 – Power triode up to 30 MHz, 6 kW
- T8P/21 – Forced-air cooled power triode up to 120 MHz, 8 kW
- T10P/22 – Power triode up to 30 MHz, 10 kW
- T-25P – Forced-air cooled power triode up to 30 MHz, 25 kW
- T60W/21 – Water-cooled power triode up to 30 MHz, 6 kW
Media related to Lamina vacuum tubes at Wikimedia Commons
Media related to Lamina gas discharge tubes at Wikimedia Commons
RFT transmitting tubes system
Rundfunk- und Fernmelde-Technik(de, sv) was the brand of a group of telecommunications manufacturers in the German Democratic Republic. The designation consists of a group of three letters and a group of three or four digits.
The first two letters determine the tube type:
- GR – Rectifier tube
- SR – Transmitter tube
- VR – Amplifier tube
The third letter specifies the cooling method:
- L – Forced-air
- S – Radiation
- V – Vapor (the anode is immersed in evaporating water, and the steam is collected, condensed and recycled)
- W – Water
The first digit (or the first two digits in double tubes) indicates the number of electrodes:
- 2 – Diode
- 3 – Triode
- 4 – Tetrode
- 5 – Pentode
The last two digits are sequentially assigned.
Examples:
- GRS251 – Radiation-cooled 25 kV/300 mA rectifier
- SRL/W314 – Forced-air/water-cooled triode up to 30 MHz, 12 kW
- SRL364 – Forced-air cooled triode up to 175 MHz, 14 kW
- SRL458 – Forced-air cooled tetrode up to 790 MHz, 10 kW
- SRL462 – Forced-air cooled tetrode up to 30 MHz, 25 kW
- SRS301 – Radiation-cooled triode up to 40 MHz, 900 W
- SRS362 – Radiation-cooled triode up to 100 MHz, 1.25 kW
- SRS401 – Radiation-cooled tetrode up to 120 MHz, 1 kW
- SRS464 – Radiation-cooled, vibration-resistant pulse tetrode up to 300 kW
- SRS4451 – Radiation-cooled dual tetrode up to 500 MHz, 60 W
- SRS4452 = QQE03/20 = 6252 – Radiation-cooled dual tetrode up to 600 MHz, 20 W
- SRS4452 – Radiation-cooled dual tetrode up to 600 MHz, 20 W
- SRS4453 – Pulse version of the SRS4451
- SRS501 – Radiation-cooled pentode up to 50 MHz, 100 W
- SRS552N = ГУ-50 – Radiation-cooled pentode up to 120 MHz, 50 W
- SRV355 – Vapor-cooled triode up to 30 MHz, 50 kW
- SRW353 – Water-cooled tetrode up to 220 MHz, 15 kW
- VRS303 – Radiation-cooled AF triode, 1 kW
- VRS328 – Radiation-cooled AF triode, 150 W
- VRS331 – Radiation-cooled AF triode, 450 W
Note: RFT used the Mullard–Philips and RETMA schemes for their low-power tubes.
- RFT Microwave tubes
- HKR – Reflex Klystron
- HMD – CW Magnetron
- HMI – Pulse Magnetron
- HRO – Backward-wave oscillator
- HSE – TR cell
- HSS – ATR cell
- HT – Triode
- HTG – Triode oscillator
- HWE – Signal traveling-wave tube
- HWL – Power traveling-wave tube
Then a sequentially assigned number, the first one or two digits of which give the frequency in GHz.
Media related to RFT vacuum tubes at Wikimedia Commons
Tesla systems
Signal tubes
Besides the genuine Mullard–Philips system, Tesla also used an M-P/RETMA hybrid scheme:[12]
First number: Heater voltage, as in the RETMA system
Next letter(s): Type, subset of the Mullard–Philips system
Next digit: Base
- 1 – K8A Octal
- 2 – B8G Loctal
- 3 – B7G Miniature 7-pin
- 4 – B9A Noval
- 5 – Special, mostly 9 out of 10 1.25mm pins on a 25mm-diameter circle
- 6 – B11A Submagnal
- 7 – B12A Duodecal
- 8 – B14A Diheptal
- 9 – Wire-ends
Last digit: Sequentially assigned number
Examples:
- 1M90 = DM70/1M3 – Subminiature indicator tube, 1.4 V/25 mA filament, all-glass wire-ended
- 1Y32 – Miniature 7-pin CRT EHT rectifier, 1.4 V/265 mA thoriated tungsten filament
- 1Y32T – 1Y32 with a wide-range, 1.19 V to 1.61 V oxide-coated filament
- 4L20 – Directly heated RF power pentode, center-tapped 4.2 V/325 mA filament; Soviet 4П1Л↦4P1L, German RL4,2P6 with Loctal base
- 6B31 – Dual diode up to 700 MHz, 6.3 V/300 mA heater, Miniature 7-pin base
- 6BC32 = 6AV6/EBC91 – Dual diode + triode, 6.3 V/300 mA heater, Miniature 7-pin base
- 6CC31 = 6J6/ECC91 – Dual VHF triode up to 600 MHz, 6.3 V/450 mA heater, Miniature 7-pin base
- 6CC42 = 2C51 = 6Н3П↦6N3P (5670) – Dual VHF triode, 6.3 V/350 mA heater, Noval base
- 6F24 – Telecom pentode, 6.3 V/450 mA heater, Loctal base
- 6F36 = 6AH6 = 6Ж5П↦6J5P – Sharp-cutoff IF/video pentode, 6.3 V/450 mA heater, Miniature 7-pin base
- 6H31 = 6BE6/EK90 = 6А2П↦6A2P – Heptode mixer, 6.3 V/300 mA heater, Miniature 7-pin base
- 6L31 = 6AQ5/EL90 – Power pentode, 6.3 V/450 mA heater, Miniature 7-pin base
- 6L41 = 5763 (6П1П↦6P1P) – Beam power tetrode, 6.3 V/750 mA heater, Noval base
- 35Y31 – Half-wave rectifier, 35 V/150 mA series heater; UY1(N) with Miniature 7-pin base
Power tubes
First letter:
- R – Rectifier or RF tube
- U – Gas-filled rectifier
- Z – Modulator tube
Next letter(s): Type, subset of the Mullard–Philips scheme
Next number: Anode dissipation in W (if radiation-cooled) or kW (otherwise)
The next letter specifies the cooling method:
- <none> – Radiation
- V – Vapor
- X – Forced-air
- Y – Water
Examples:
- RA0007A (Octal base), RA0007B (Noval base) – 600 V, 700 µA Directly heated, thermally-limited (=saturated) emission diode, 1.4 V/3.5 Amax uncoated tungsten filament, usable 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; cf. 5845, YA1000
- RA025B – 20 kV, 250 mA Half-wave rectifier with an E40 Goliath Edison screw lamp base and an anode screw top cap
- RA05A – 25 kV, 700 mA Half-wave rectifier with an E40 Goliath Edison screw lamp base and an anode screw top cap
- RA7YB – 25 kV, 7 A Half-wave rectifier
- RA100A – 40 kV, 100 mA Half-wave rectifier with an E40 Goliath Edison screw lamp base and anode on top cap
- RC5B – Bowl-type UHF power triode up to 5 W
- RD27AS – Radiation-cooled power triode up to 25 MHz, 27 W
- RD200B – Radiation-cooled power triode up to 60 MHz, 200 W
- RD300S – Radiation-cooled power triode up to 200 MHz, 300 W
- RD1XB – Water-cooled power triode up to 30 MHz, 1 kW
- RD1.5XA – Forced-air cooled power triode up to 30 MHz, 1.5 kW
- RD2XF – Forced-air cooled power triode up to 150 MHz, 2 kW
- RD3XL – Forced-air cooled power triode up to 30 MHz, 2 kW
- RD5XF – Forced-air cooled power triode up to 100 MHz, 5 kW
- RD5YA – Water-cooled power triode up to 20 MHz, 5 kW
- RD8XA – Forced-air cooled power triode up to 3 MHz, 8 kW
- RD12XB – Forced-air cooled power triode up to 30 MHz, 12 kW
- RD12YB – Water-cooled power triode up to 30 MHz, 12 kW
- RD18YA – Water-cooled power triode up to 30 MHz, 18 kW
- RD20VL – Vapor-cooled power triode up to 100 MHz, 20 kW
- RD20XF – Forced-air cooled power triode up to 30 MHz, 20 kW
- RD50VL – Vapor-cooled power triode up to 100 MHz, 50 kW
- RD50XA – Forced-air cooled power triode up to 3 MHz, 50 kW
- RD50YA – Water-cooled power triode up to 10 MHz, 50 kW
- RD75YB – Water-cooled power triode up to 3 MHz, 75 kW
- RD150YA – Water-cooled power triode up to 3 MHz, 150 kW
- RE40AK = KT88
- RE65A – Radiation-cooled beam power tetrode up to 260 MHz, 65 W
- RE125C – Radiation-cooled beam power tetrode up to 235 MHz, 125 W
- RE400C – Radiation-cooled beam power tetrode up to 235 MHz, 400 W
- RE1000F – Radiation-cooled beam power tetrode up to 150 MHz, 1 kW
- RE041XL – Forced-air cooled beam power tetrode up to 250 MHz, 500 W
- RE0125XL – Forced-air cooled beam power tetrode up to 500 MHz, 150 W
- RE025XA – Forced-air cooled beam power tetrode up to 500 MHz, 250 W
- RE1.5XL – Forced-air cooled beam power tetrode up to 250 MHz, 2 kW
- RE5XL – Forced-air cooled beam power tetrode up to 250 MHz, 5 kW
- RE20XL – Forced-air cooled beam power tetrode up to 220 MHz, 20 kW
- REE30A – Radiation-cooled dual beam power tetrode up to 250 MHz, 20 W
- RL15A – Radiation-cooled power pentode up to 60 MHz, 20 W
- RL40A – Radiation-cooled power pentode up to 120 MHz, 40 W
- RL65A – Radiation-cooled power pentode up to 15 MHz, 65 W
- UA025A – 10 kV, 250 mA Argon-filled, half-wave rectifier with an E27 Edison screw lamp base and an anode screw top cap
- UA1A – 8 kV, 1 A Half-wave mercury-vapor rectifier with an E40 Goliath Edison screw lamp base and an anode screw top cap
- UA3A – 11 kV, 3 A Half-wave mercury-vapor rectifier with an E40 Goliath Edison screw lamp base and an anode screw top cap
- UA5A – 11 kV, 5 A Half-wave mercury-vapor rectifier with a 2-pin base and an anode screw top cap
- ZD1000F – Radiation-cooled power triode up to 60 MHz, 1 kW
- ZD1XB – Forced-air cooled AF power triode up to 1.2 kW
- ZD3XH – Forced-air cooled power triode up to 60 MHz, 3 kW
- ZD8XA – Forced-air cooled power triode up to 20 MHz, 8 kW
- ZD12YA – Forced-air cooled AF power triode up to 20 MHz, 12 kW
- ZE025XS – Forced-air cooled beam power tetrode up to 400 MHz, 250 W
Media related to Tesla vacuum tubes at Wikimedia Commons
Media related to Tesla gas discharge tubes at Wikimedia Commons
Tungsram receiving tubes system before 1934
The Tungsram system was composed of a maximum of three letters and three or four digits.[55][54] 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: System type:
- Note: A preceding letter A indicates an indirectly heated tube
- D – Detector diode
- DD – Dual diode
- DG – Tetrode with a space charge grid (the 2nd grid is the control grid)
- DS – Diode + tetrode
- FH – Remote-cutoff hexode pentagrid converter
- G – Preamplifier triode
- H – Signal triode or grid-leak detector
- HP – RF pentode
- HR – RF triode
- L – AF power triode
- MH – Hexode pentagrid converter
- MO – Octode pentagrid converter
- O – Transmitting tube
- P – Power triode
- PP – Power pentode
- PV – Full-wave rectifier
- R – High-μ triode
- S – Tetrode
- V – Half-wave rectifier
- X – US-licensed tube
Number:
- First digit (or the first two digits): Heater voltage
- Remaining digits: Heater current in tens of mA, but the last digit is sequentially assigned
Examples:[50]
- AS4100 – Tetrode, 4 V/1 A (=100 × 10 mA) indirect heater
- FH4105 = E449 = RENS1234 – Indirectly heated remote-cutoff hexode mixer, 4 V/1.2 A heater
- HP4101 = E446 = RENS1284 – RF pentode, 4 V/1 A filament
- HP4106 = E447 = RENS1294 – Indirectly heated remote-cutoff RF pentode, 4 V/1.1 A heater
- HR406 = A425 = RE034 – RF triode, 4 V/60 mA (=6 × 10 mA) filament
- L414 = B409 = RE134 – Triode, 4 V/140 mA (=14 × 10 mA) filament
- MH2018 = B2048 = RENS1824 – Hexode mixer, 20 V/180 mA (=18 × 10 mA) heater
- MH4100 = E448 = RENS1224 – Indirectly heated sharp-cutoff hexode mixer, 4 V/1.2 A heater
- PP2018D = B2043 = RENS1823D = L2318D – Indirectly heated power pentode, 20 V/180 mA DC series heater
- PP4101 = E443H = RES964 = L496D = RTP4 = P435 – Power pentode, 4 V heater
- PV4200 – Full-wave rectifier, 4 V/2 A (=200 × 10 mA) filament
- R2018 = B2038 = REN1821 = A2118 – Triode, 180 mA heater
- S406 = A442 = RES094 – Directly heated tetrode with a screen grid, 4 V/60 mA filament
- S2018 = B2042 = RENS1820 = H2018D – RF Tetrode, 180 mA heater
Media related to Tungsram vacuum tubes at Wikimedia Commons
Russian systems
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 letters and a sequentially assigned number with up to 3 digits[54]
First letter: System type:
- Б ⟼ B – Power oscillator tube or barretter
- В ⟼ V – Rectifier (Russian: Выпрями́тель "Rectifier")
- Г ⟼ G – RF power tube (Russian: Генератор "Generator")
- Ж ⟼ J – Low-power oscillator tube
- M ⟼ M – Modulator
- Н ⟼ N – AF amplifier (Russian: Низкий "Low" [frequency])
- П ⟼ P – Receiver tube (Russian: Приёмная "Reception")
- С ⟼ S – Special tube, such as a pentode or a CRT (Russian: Специальный "special")
- Т ⟼ T – Carrier frequency tube
- У ⟼ U – Amplifier tube (Russian: Усилитель "Amplifier")
Second letter (optional): Type of cathode:
- Б ⟼ B – Barium-coated
- К ⟼ K – Carburized
- О ⟼ O – Oxide-coated
- Т ⟼ T – Thoriated
- Ц ⟼ C – Caesium-coated
Then a dash ("-"), followed by a sequentially assigned number
- ВО-116, ВО-188, ВО-202 ⟼ VO-116, VO-188, VO-202 – Full-wave rectifiers with an oxide-coated cathode
- СБ-242, СБ-244, СО-241 ⟼ SB-242, SB-244, SO-241 – 2-volts directly heated tube set for budget-priced portable, battery-operated radios
- СО-118, СО-122, СО-124 ⟼ SO-118 (Triode), SO-122 (Power pentode), SO-124 (Tetrode) – 4-volts indirectly heated tube set for premium radios
- CO-148 ⟼ SO-148 – Remote-cutoff tetrode with an oxide-coated cathode
- СО-242 ⟼ SO-242 – Heptode with an oxide-coated cathode
- УБ-110 ⟼ UB-110 – Triode with a barium-coated cathode
- УО-104, УО-186 ⟼ UO-104, UO-186 – Power triodes
- СБ-154, УБ-107, УБ-110, УБ-132 ⟼ SB-154, UB-107, UB-110, UB-132 – Budget-priced, 4-volts directly heated power triodes
In 1937, the Soviet Union purchased a tube assembly line from RCA (who at the time had difficulties raising funds for their basic operations), including production licenses and initial staff training, and installed it on the Светлана (Svetlana) plant in St. Petersburg, Russia. US-licensed tubes were produced since then under an adapted RETMA scheme.
Examples:[58]
- 6Ф5 = 6F5 – High-μ triode
- 6Ф6 = 6F6 – Power pentode
- 6Х6 = 6H6 – Dual diode
- 6Ж7 = 6J7G/EF37 – Sharp-cutoff pentode
- 6Л6 = 6L6 – Beam power tetrode
- 6Л7 = 6L7 – Pentagrid converter
- 6Н7 = 6N7 – Dual power triode
- 6АЖ5 = 6AJ5 – Low (6.3-80 V) anode voltage, sharp-cutoff pentode
The Chinese 广州曙光无线电厂 (Guangzhou Shuguang Radio Factory) did the reverse, adapting the GOST system (below) to Latin letters for some of their tubes.[59]
GOST standard tubes system
In 1950, a 5-element system (Russian: Государственный Стандарт "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.[60][61]
The 1st element is a number specifying filament voltage in volts (rounded to the nearest whole number; 06 means 0.625 V)
The 2nd element is a Cyrillic character specifying the type of device:
- А ⟼ A – Pentagrid converter
- Б ⟼ B – Diode + pentode
- В ⟼ V – Vacuum tube with secondary emission
- Г ⟼ G – Diode + triode
- Д ⟼ D – Diode, including booster/damper/efficiency diodes
- Е ⟼ Ye – Optical tuning/level indicator
- Ж ⟼ J – Sharp-cutoff pentode
- И ⟼ I – Triode/hexode, triode/heptode or triode/octode mixer
- К ⟼ K – Remote-cutoff pentode
- Л ⟼ L – Nonode
- Н ⟼ N – Dual triode
- П ⟼ P – Power pentode or beam power tetrode
- Р ⟼ R – Dual tetrode or dual pentode
- С ⟼ S – Triode
- У ⟼ U – Power triode (was soon deprecated)
- Ф ⟼ F – Triode + pentode
- Х ⟼ H or X – Dual diode
- МХ ⟼ MH – Mechanotron-type mechano-electronic displacement sensor
- МДХ ⟼ MDH – Mechanotron-type mechano-electronic pressure sensor
- МУХ ⟼ MUH – Mechanotron-type mechano-electronic rotation sensor
- Ц ⟼ C – Kenotron
- Э ⟼ E – Tetrode
The 3rd element is a sequentially assigned number – a series designator that distinguishes between different devices of the same type.
The 4th element denotes vacuum tube construction (base, envelope):
- <none> – All-metal tube
- Д ⟼ D – Disk-seal tube for UHF operation
- Ж ⟼ J – Acorn tube
- К ⟼ K – Ceramic/metal envelope
- Л ⟼ L – Loctal base
- М ⟼ M – Short envelope with an Octal base
- Н ⟼ N – Nuvistor
- 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
The 5th element is optional. It consists of a dash ("-") followed by one or more characters denoting special characteristics; in most cases this means construction differences to the basic version (rather than a selection for those characteristics from the regular-quality production):
—GOST 5461-50:
- Р ⟼ R – Improved quality
- ВР ⟼ VR – Increased reliability
- ДР ⟼ DR – Very long life
- ЕР ⟼ YeR – Long-life
—GOST 13393-76:
- В ⟼ V – Shock/vibration resistant
- Д ⟼ D – Long-life (≥10000 h)
- Е ⟼ Ye – Long-life (≥5000 h)
- И ⟼ I – Pulse power tube
- К ⟼ K – Low-microphonics/low-noise
For examples see below
Professional tubes system
Used for professional/industrial/computer/telecommunications tubes[63][54]
The 1st element: Function
- БХ, БХВ, БСМ, БСВ ⟼ BH, BHV, BSM, BSV – X-ray tube
- В ⟼ V – Vacuum rectifier (Russian: Выпрями́тель)
- ВГ ⟼ VG – Gas-discharge or mercury-vapor rectifier
- ВИ ⟼ VI – Pulse rectifier
- Д ⟼ D – Gas-discharge lamp
- Г ⟼ G – RF power tube (Russian: Генератор "Generator"), two-lettered with some notable exceptions such as the Г807
- ГД ⟼ GD – Longwave tube (Russian: Длинный "Long")
- ГК ⟼ GK – Shortwave tube (≤30 MHz; Russian: Короткий "Short")
- ГУ ⟼ GU – VHF tube (≤300 MHz; Russian: Ультракоро́ткий "Ultra-short" [wave tube])
- ГС ⟼ GS – Microwave tube (>300 MHz; Russian: Сверхвысокочастотный)
- ГМ ⟼ GM – Modulator tube
- ГИ ⟼ GI – Impulse tube
- ГМИ ⟼ GMI – Pulse modulator tube
- ГП ⟼ GP – Power tube for use in shunt or series-pass voltage regulators
- ГПИ ⟼ GPI – Pulse power tube
- ГГ ⟼ GG – Gas-discharge rectifier
- ГР ⟼ GR – Mercury-vapor rectifier (Russian: Ртуть "Mercury")
- ГШ, ГШП ⟼ GSha, GShaP – Noise diode (Russian: Шум "Noise")
- ЕГ, ОГ ⟼ YeG, OG – Dekatron
- И ⟼ I – Ignitron
- К, КУ, КИУ ⟼ K, KU, KIU – (Reflex-)Klystron
- Л ⟼ L – Beam deflection tube incl. CRTs (Russian: Электронно-лучевые приборы "Electron beam device", "CRT")
- Most CRT designations are preceded by a number giving the screen diagonal or diameter in cm (rounded-off to the nearest whole number)
- ЛИ ⟼ LI – Video camera tube or monoscope (Russian: Изобразить "to picture")
- ЛК ⟼ LK – CRT for TV with magnetic deflection (Russian: Кинеско́п, meaning "picture tube", not "Kinescope")
- ЛМ ⟼ LM – Radar CRT, flying-spot scanner, Skiatron, etc. with magnetic deflection
- ЛН ⟼ LN – Storage tube (Russian: Накопить "to stockpile")
- ЛНС ⟼ LNS – Typotron (Russian: Символ; Знакопечатающая запоминающая трубка "Symbol/Character/Glyph"; "Typographic memory tube")
- ЛО ⟼ LO – CRT for oscilloscopes with electrostatic deflection
- 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 collector located behind a target perforated with sub-mm holes patterned such that the hole density z at any given x,y position is proportional to the value of the desired f (x,y)
- ЛП ⟼ LP – Trochotron (Russian: Электронно-лучевой переключатель "Electron beam switch")
- ЛС ⟼ LS – Charactron (Russian: Знакопечатающая трубка "Typographic tube")
- М ⟼ M – Magnetron
- МИ ⟼ MI – Pulse Magnetron
- МУ, МИУ ⟼ MU, MIU – Crossed-field amplifier (Russian: УСП "CFA")
- ОВ, ОВС ⟼ OV, OVS – Backward-wave amplifier (Russian: Ла́мпа обра́тной волны́)
- Р, РБ, РЭ ⟼ R, RB, RE – Spark gap, surge arrester (Russian: Разрядка "discharge")
- СБМ, СБС, СБТ, СИ, СГМ, СТС ⟼ SBM, SBS, SBT, SI, SGM, STS – Radiation detector tube (Geiger-Müller counter tube or proportional counter tube; Russian: Счётчик Гейгера "Geiger counter")
- СГ ⟼ SG – Voltage-regulator tube (Russian: Стабилотрон газовый "Gas Stabilotron")
- СТ ⟼ ST – Barretter (Russian: Стабилизатор тока "Current stabilizer")
- Т ⟼ T – Thyratron
- ТГ, ТГИ ⟼ TG, TGI – Gas-filled thyratron
- ТР ⟼ TR – Mercury-vapor thyratron
- ТХ, ТХИ, МТХ ⟼ TH, THI, MTH – Gas-filled, cold-cathode thyratron (Russian: Холодный "Cold")
- УВ, УВИ ⟼ UV, UVI – Forward-wave amplifier
- Ф ⟼ F – Phototube
- ФЭК ⟼ FEK – High-speed pulse phototube with a coaxial output connector
- ФЭУ ⟼ FEU – Photomultiplier (Russian: Фотоэлектронный умножитель)
- ЭМ ⟼ EM – Electrometer tube
- ЭПЛ ⟼ EPL – Semiconductor/tube hybrid (Russian: Электронно-полупроводниковая лампа)
Next elements:
—Ignitrons, Rectifier tubes, Thyratrons:
- A digit
- Then a dash ("-"), followed by the anode current in A
- Then a slash ("/"), followed by the anode voltage in kV
- Then a letter specifying the cooling method:
- <none> – Radiation
- А ⟼ A – Water
—Transmitting tubes:
- A dash ("-"), followed by a sequentially assigned number
- Then a letter specifying the cooling method:
- <none> – Radiation
- А ⟼ A – Water
- Б ⟼ B – Air
- К ⟼ K – Contact
- П ⟼ P – Vapor
—Phototubes and Photomultipliers:
- A dash ("-"), followed by a sequentially assigned number
- Then one or two letters:
—Radiation detectors:
For examples see below
Japanese systems
Older numbering system 1930s–40s
A letter: Structure and usage[64]
- E – Electron ray tube
- K – Kenotron
- U – General-purpose tube
Then a letter: Base and outline
- N – Wire-ended (Acorn tubes, etc.)
- S – Octal glass or metal
- T – ST large 7-pin
- t – ST small 7-pin
- V – 4-pin
- X – S/ST 4-pin
- x – Peanut 4-pin
- Y – S/ST 5-pin
- y – Peanut 5-pin
- Z – S/ST 6-pin U6A
Then a dash ("-"), followed by a sequentially assigned number or the designation of the American original
Then an optional dash ("-"), followed by a letter: Variant
Examples:[65]
- EZ-6G5 = 6G5 – Vari-μ "Magic Eye"-type tuning indicator
- KX-80-B – Kenotron
- UN-954 = 954 – Acorn sharp-cutoff pentode
- UN-955 = 955 – Acorn triode
- US-6A8 = 6A8 – Pentagrid converter
- US-6L7G = 6L7G – Pentagrid converter
- UX-26-B – Medium-μ RF triode
- UX-167 – Sharp-cutoff RF pentode
- UY-47B – Pentode
- UZ-58-A – Remote-cutoff RF/IF pentode
JIS C 7001 system
JIS C 7001 was published in 1951 and modified in 1965 and 1970[64]
A number: Heater voltage range, as in the RETMA scheme
- 1 – 1 V ≤ Uf < 2 V
- 2 – 2 V ≤ Uf < 2.5 V
- 3 – 2.5 V ≤ Uf < 4 V
- 4 – 4 V ≤ Uf < 5 V
- 5 – 5 V ≤ Uf < 6 V
- 6 – 6 V ≤ Uf < 7 V
etc.
Then a letter: Base and Outline
- A – Special base
- B – Other
- C – Duodecar (Compactron)
- D – Subminiature button base
- E – Subminiature flat (inline) base
- F – European 4-pin ST
- G – Octal base glass tubular (GT)
- H – Magnoval
- K – Ceramic
- L – Loctal
- M – Miniature 7-pin
- N – Nuvistor
- Q – Acorn tube
- R – Noval or Neonoval
- T – Large 7-pin ST
- W – 7-pin ST
- X – 4-pin ST
- Y – 5-pin ST
- Z – 6-pin ST
Then a dash ("-"), followed by a letter: Structure and usage
- A – Power triode
- B – Beam power tetrode
- C – Pentagrid converter
- D – Diode
- E – Optical tuning/level indicator
- G – Gas-discharge rectifier
- H – High-μ triode (μ>30)
- K – Kenotron
- —Even number after K: Full-wave rectifier
- —Odd number after K: Half-wave rectifier
- L – Low-μ triode (μ<30)
- P – Power tetrode or pentode
- R – Sharp-cutoff tetrode or pentode
- S – Tetrode with a space charge grid (the 2nd grid is the control grid)
- T – Thyratron
- V – Remote-cutoff tetrode and pentode
- X – Other
Then a sequentially assigned number
Then an optional letter: Variant
Examples:[65]
- 2N-H12 – Nuvistor
- 2X-L2A – Low-μ triode
- 6C-A10 – Power triode
- 6G-A4 – Power triode
- 6G-B8 – Beam power tetrode
- 6G-E12A – 2-channel "Magic Eye"-type tuning indicator, rectangular target
- 6H-B26 – Beam power tetrode
- 6M-DE1 – Diode + "Magic Eye"-type tuning indicator, Miniature 7-pin base
- 6M-E4 – "Magic Finger"-type tuning indicator, Miniature 7-pin base
- 6M-E5 = 6ME5 – "Magic Eye"-type tuning indicator, Miniature 7-pin base
- 6M-E10 – "Magic Eye"-type tuning indicator, Miniature 7-pin base
- 6N-H10 – Nuvistor
- 6R-A8 – Power triode
- 6R-B10 – Beam power tetrode
- 6R-B11 – Beam power tetrode
Military naming systems
British CV and M8000s naming systems
This system prefixes a three- or four-digit number with the letters "CV", meaning "civilian valve" i.e. common to all three armed services.[66] 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 = 6SN7GT = ECC32 (not a direct equivalent as heater current is different and envelope is larger)
- CV2729 = E80F – An SQ version of EF80 but with revised pin-out 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:
- CV4007 = E91AA – SQ version of 6AL5
- CV4010 = E95F – SQ version of 6AK5 or EF95
- CV4014 = M8083
The "M8" in the part number denotes 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, for use 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
The oldest numbering systems date back to the early 1920s, such as a two-digit numbering system (examples), starting with the UV-201A, which was abbreviated as "type '01A", and extended almost continuously up into the 1980s.
Since the 1930s, several proprietary systems exist. These tend to be used for devices for professional equipment.
Some systems were used by only one manufacturer (examples), who sometimes derived a letter prefix from the behavior of devices considered to be exceptional:
- Mazda/EdiSwan sold their first tubes for 4-volts AC mains transformer (as opposed to home storage battery) heating with the prefix AC/ (examples)
- The first beam tetrodes manufactured in the UK in the late 1930s by M-OV/GEC, carried a "KT" prefix meaning Kinkless Tetrode (examples)
Other systems grew into informal standards adopted by many manufacturers for their special-purpose/special-quality tubes:
- Low 800s – Mainly transmitter output types
- High 800s – Mainly (gas-filled) rectifiers and thyratrons
- 900s – Mainly RCA
- Low 900s – Mainly phototubes and photomultipliers
- High 900s – Mainly Acorn tubes
- 1600s – Mainly RCA
- 4000s – Mainly Philips/Mullard/LaRadioTechnique/Valvo, RCA, STC (not coordinated)
- 9000s – Mainly RCA VHF/UHF tubes
Use was not rigorously systematic; optional letter prefixes are mostly manufacturer's codes:
- C – RCA/Cunningham
- CK, QK, RK – Raytheon Company
- ECG – Philips/Sylvania
- EM – Eitel McCullough (Eimac)
- F – ITT/Federal Telephone and Radio
- GE, GL – General Electric Corp. (not British General Electric Company)
- HK – Heintz & Kaufman, Ltd. (San Francisco, California, USA)
- HY – CBS/Hytron (Salem, Massachusetts, USA)
- KU – ITT/Kuthe Laboratories (Newark, New Jersey, USA)
- ML – Machlett Laboratories, Inc.
- NL – Eimac/National Electronics, Inc. (Geneva, Illinois, USA)
- NU – National Union Electric Corp. (Orange, New Jersey, USA)
- PL – Philips N.V.
- RCA – RCA/Radiotron
- SV – Светлана (Svetlana)
- SY – Standard Telephones and Cables Australia branch, Sydney plant or Sylvania, Inc.
- TH – Compagnie Française Thomson-Houston
- WE – Western Electric Company
- WL – Westinghouse Electric Corp.
- XD – Central Electronic Manufacturers (Denville, New Jersey, USA)
List of American RETMA tubes
Note: Typecode explained above
0 prefix - Gas-filled cold-cathode tubes
First character is numeric zero, not letter O.
Voltage-regulator tubes
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
- 0A2 = 150C2 – 150 V Voltage-regulator tube, Miniature 7-pin base
- 0A3 = VR75 – 75 V Voltage-regulator tube, Octal base
- 0B2 = 108C1 (6627) – 105 V Voltage-regulator tube, Miniature 7-pin base
- 0B3 = VR90 – 90 V Voltage-regulator tube, Octal base
- 0C2 – 75 V Voltage-regulator tube, Miniature 7-pin base
- 0C3 = VR105 – 105 V Voltage-regulator tube, Octal base
- 0D3 = VR150 – 150 V Voltage-regulator tube, Octal base
- 0E3 = 85A1 – 85 V Voltage-regulator tube, 3-pin base
- 0G3 = 85A2 – 85 V Voltage-regulator tube, Miniature 7-pin base
Trigger tubes
- 0A4G (Z300T) – 25 mAavg, 100 mApeak Gas triode 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 triode with a keep-alive (primer) electrode and a shield grid, designed for relay drive and general switching service
Rectifiers
- 0Y4 – 300 V, 40 ≤ I ≤ 75 mA Half-wave gas rectifier with a starter anode, 5-pin Octal base
- 0Z3 – 300 V, 30 ≤ I ≤ 75 mA Full-wave gas rectifier, 5-pin base. Used in vibrator power supplies in early automobile radio receivers
- 0Z4 – 880 V, 30 ≤ I ≤ 90 mA Argon-filled, full-wave gas rectifier, 5-pin Octal base. Widely used in vibrator power supplies in early automobile radio receivers
1 prefix - 1 volt filament/heater tubes
1.25 volt DC filament subminiature tubes
The following tubes were used in post-World War II walkie-talkies and pocket-sized portable radios. All have 1.25 volt DC filaments and directly heated cathodes. Some specify which end of the filament is to be powered by the positive side of the filament power supply (usually a battery). All have glass bodies ca. 0.366–0.4 in (9–10 mm) (round) resp. 0.285 by 0.366–0.4 in (7 by 9–10 mm) (elliptical) in diameter, and 1+1⁄8 to 2 in (29 to 51 mm) in length
1AD4, 1AG4, 1AG5, 1AK4 and 1AK5 pentodes have a split suppressor grid, its halves tied to the positive resp. negative filament end
- 1AC5 – Power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AD4/DF62 – Sharp-cutoff pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AD5 – Sharp-cutoff pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1AE5 – Heptode mixer, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AG4 – Power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AG5 – Diode + pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AH4 – RF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AJ5 – Diode + sharp-cutoff pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AK4 – Sharp-cutoff pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1AK5 – Diode + sharp-cutoff pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 1C8 – Heptode pentagrid converter, all-glass round cross-section envelope and circular 8-pin/wire-ends base
- 1D3 – Low-μ UHF triode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1E8 – Heptode pentagrid converter, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1Q6 – Diode + pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1S6 – Diode + pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1T6 – Diode + pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1V5 – Power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 1V6/DCF60 – Oscillator/mixer triode/pentode, all-glass elliptical cross-section envelope with 7 long inline wire-ends
- 1W5 – Sharp-cutoff pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
More of these tubes are listed as equivalents under M-P D - 1.4 V filament/heater
1.4 volt DC filament/heater tubes
- 1A3/DA90 – Indirectly heated FM discriminator diode, 1.4 V/150 mA heater, Miniature 7-pin base. Used as a detector in some portable AM/FM receivers
- 1A7GT/DK32 – Heptode pentagrid converter, 1.4 V/50 mA filament, Miniature 7-pin base, re-engineered variant of types 1A6 and 1D7-G, designed for use in Three-way portable (AC/DC/Dry-cell battery) radios introduced in 1938
- 1B7GT – Heptode pentagrid converter, 1.4 V/100 mA filament, re-engineered variant of types 1C6 and 1C7-G, designed for use in dry-cell battery radios with shortwave bands
- 1G6G – Dual power triode. "GT" version also available
- 1L6 – Heptode pentagrid converter for battery radios with 50 mA filament
- 1LA6 (Loctal) and later 1L6 (Miniature 7-pin) – Battery heptode pentagrid converter for Zenith Trans-Oceanic shortwave radio, 50 mA filament
- 1LB6 – Heptode pentagrid converter for battery-operated radios
- 1LC6 – 1LA6 with higher conversion transconductance
- 1R5/DK91 – Heptode pentagrid converter, anode voltage in the 45...90 volt range, Miniature 7-pin base
- 1S4/DL91 – 270 mW AF power pentode Class-A amplifier, anode voltage in the 45...90 volt range, 1.4 V/100 mA filament, Miniature 7-pin base
- 1S5/DAF91 – Diode + sharp-cutoff pentode Class-A amplifier, anode voltage in the 67...90 volt range, 50 mA filament, Miniature 7-pin base, used as detector and first AF stage in battery radio receivers
- 1S5-SF = 1S5T = 1AR5 – 1S5/DAF91 with a 25 mA filament
- 1S5-SF = 1S5T = 1AR5 – 1S5/DAF91 with a 25 mA filament
- 1T4/DF91 – Remote-cutoff RF pentode Class-A amplifier, Miniature 7-pin base, used as RF and IF amplifier in battery radio receivers
- 1U4/DF904/5910 – Sharp-cutoff RF pentode Class-A amplifier, Miniature 7-pin base, used as RF and IF amplifier in battery radio receivers; similar characteristics to 6BA6/EF93
- 1U6 – 1L6 with a 1.4 V/25 mA filament
More of these tubes are listed as equivalents under M-P D - 1.4 V filament/heater
2 volt DC filament tubes
These tubes were made for home storage battery receivers manufactured during the early to mid-1930s; all have 2.0 volt DC filaments despite the 1-prefix, intended to distinguish them from the 2.5 volt AC heated tubes listed below
- 1A4P – Remote-cutoff pentode, U4A American 4-pin base
- 1A4T – Remote-cutoff tetrode, U4A American 4-pin base
- 1A6 – Heptode pentagrid converter, U6A American 6-pin base, up to only 10 MHz due to low heater power (2 V/60 mA) and consequent low emission in the oscillator section, also occasionally used as a grid-leak detector
- 1B4P – Sharp-cutoff pentode, U4A American 4-pin base
- 1B4T – Sharp-cutoff tetrode, U4A American 4-pin base
- 1B5 – Dual detector diode + medium-μ triode, U6A American 6-pin base, usually numbered 1B5/25S
- 1C5/DL35 – Power pentode, Octal base; similar to 3Q5 except for filament
- 1C6 – Heptode pentagrid converter; 1A6 with double the heater power and double the frequency range
- 1C7G – 1C6 with an Octal base
- 1D5GP – 1A4P with an Octal base
- 1D5GT – 1A4T with an Octal base (Note: This is a shouldered "G" Octal, not a cylindrical "GT" Octal)
- 1D7G – 1A6 with an Octal base
- 1E5GP – 1B4P with an Octal base
- 1E5GT – 1B4T with an Octal base (Note: This is a shouldered "G" Octal, not a cylindrical "GT" Octal)
- 1E7G – Dual power pentode, Octal base, for use as a driver when parallel-connected, or as a push-pull output. "GT" version also available
- 1F4 – Power pentode, U5A American 5-pin base
- 1F5G – 1F4 with an Octal base
- 1F6 – Dual diode + sharp-cutoff pentode, U6A American 6-pin base
- 1F7G – 1F6 with an Octal base
- 1G5G – Power pentode, Octal base
- 1H4G – Medium-μ triode, can be used as a power triode; 30 (upgraded version of type 01-A) with an Octal base. "GT" version also available
- 1H6G – 1B5/25S with an Octal base. "GT" version also available
- 1J5G (950) – AF power pentode, Octal base
- 1J6G – Dual power triode; 19 with an Octal base. "GT" version also available
One-volt ballast tubes
Used to adapt the above 2 volt DC filament tubes to 2-cell dry batteries
- 1D1 – 240 mA filament
- 1D2, 1G1 – 420 mA filament
- 1A1 – 490 mA filament
- 1R1, 1Y1 – 540 mA filament
- 1K1 – 550 mA filament
- 1T1, 1V1 – 560 mA filament
- 1J1 – 620 mA filament
- 1E2, 1S1, 1W1 – 660 mA filament
- 1F1 – 720 mA filament
- 1U1 – 740 mA filament
- 1C1 – 745 mA filament
- 1Z1 – 900 mA filament
CRT anode rectifiers
- 1AD2 – Compactron CRT EHT rectifier, directly heated with 1.25 V/200 mA filament
- 1AD2A – 1AD2 retrofitted with an internal X-radiation shielding, introduced after the 1967 General Electric X-radiation scandal[67]
- 1AJ2 – Compactron CRT EHT rectifier with 1.25 V/200 mA filament
- 1AY2 – Duopin 2-pin base CRT EHT rectifier; has similar electrical characteristics as 1B3GT/DY30
- 1B3GT/1G3GT/DY30 = 1Ц7С↦1C7S – CRT EHT rectifier with 1.25 V filament, peak inverse voltage of 30 kV, anode current 2 mA average, 17 mA peak, Octal base, common in monochrome TV receivers of the 1950s and early 1960s; derived from the earlier industrial type 8016
- 1BC2 – CRT EHT rectifier with 1.25 V/200 mA filament, Noval base
- 1BC2A, 1BC2B – 1BC2 with internal X-radiation shielding
- 1BG2/DY51 – Subminiature 15 kV portable-TV CRT EHT rectifier, half-indirect (filament internally tied to cathode sleeve) 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 avoid flush-over in high-humidity and low atmospheric-pressure conditions
- 1BY2 – Compactron CRT EHT rectifier with 1.25 V/200 mA filament
- 1BY2A – 1BY2 with internal X-radiation shielding
- 1H2 – CRT EHT rectifier with half-indirect 1.4 V/550 mA heater, Noval base
- 1J3GT/1K3GT – CRT EHT rectifier, Octal base. Same characteristics as 1B3GT/DY30. Has filament-anode shorting protection
- 1S2/DY86 = 1Ц21Б↦1C21B – 18 kV CRT EHT rectifier, half-indirect 1.4 V/550 mA heater, Noval base; 6S2/EY86 or GY86 with a different heater
- 1S2A/DY87 – 6S2A/EY87 with a different heater; 1S2/DY86 with a silicone-coated envelope
- 1T2 = Brimar R16 – Subminiature CRT EHT rectifier with 1.4 V/140 mA filament, filament wires on one end, anode wire on the other
- 1V2 – CRT EHT rectifier with 0.625 V/300 mA filament, Miniature 7-pin base
- 1X2 – CRT EHT rectifier with 1.25 V/200 mA filament, Noval base
- 1X2A, 1X2B. 1X2C – 1X2 with internal X-radiation shielding
- 1Y2 – 4-pin CRT EHT rectifier with 1.5 V/290 mA filament. 50 kV max PIV, 10 mA peak, 2 mA average. Usable up to 1 MHz
- 1Z1 – CRT EHT rectifier with 0.7 V/180 mA filament, Octal base
- 1Z2 – CRT EHT rectifier with 1.25 V/265 mA filament, Noval base
2 volt heater/filament tubes
Some 6-prefix tubes were also available as 2-prefix, for television receivers with series heater strings (see below)
2.5 volt AC heater tubes
- Tubes used in AC-powered radio receivers of the early 1930s
- 2A3 – Directly heated power triode, used for AF output stages in 1930s–1940s audio amplifiers and radios
- 2A5 – Power pentode; 42 or 6F6 with a different heater
- 2A6 – Dual diode + high-μ triode; 75 with a different heater
- 2A7 – Heptode pentagrid converter; 6A7, 6A8 or 12A8 with a different heater
- 2B6 – Triple-Twin AF signal + zero bias power triode, internally connected as a cathode follower like today's Darlington transistors; cf. 295, 6AC6, 6B5, 6N6G
- 2B7 – Dual diode + remote-cutoff pentode; 6B7 with a different heater
- 2E5 – Top-view, "Magic Eye"-type tuning indicator; 2G5 with a sharp-cutoff driver triode; 6E5 with a different heater
- 2G5 – Top-view, "Magic Eye"-type tuning indicator; 2E5 with a remote-cutoff driver triode; 6G5/6U5 with a different heater
- 2A4 – Directly heated triode thyratron, 2.5 V/2.5 A heater, Octal 7-pin base
- 2B4 = 885 – Indirectly heated triode thyratron used in DuMont oscilloscopes as a sweep generator; 6Q5-G = 884 with a 2.5 V/2.5 A heater and a 5-pin base
- 2C4 – Indirectly heated triode thyratron for use in portable equipment, 2.5 V/650 mA heater, Miniature 7-pin base
CRT anode rectifiers
- 2X2 = 879 = 2Ц2С↦2C2S – CRT EHT rectifier, half-indirect 2.5 V/1.75 A heater; similar to 1B3 and 1S2/DY86 except for heater ratings
- 2X2A – 2X2, shock resistant up to 250 g
More of these tubes are listed as equivalents under M-P K - 2.0 V heater
3 volt heater/filament tubes
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
2.8 volt DC filament tubes
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 batteries) radio receivers
- 3A4/DL93 – 700 mW RF/AF power pentode, Miniature 7-pin base
- 3A5/DCC90 – Dual RF power triode, Miniature 7-pin base
- 3A8GT – Diode + triode + pentode with internal shield tied to filament center-tap, Octal base
- 3B4/DL98 – 1.25 W RF power pentode up to 100 MHz, Miniature 7-pin base
- 3B5GT – AF beam power pentode, Octal base
- 3B7 – 1.4 W Dual VHF power triode up to 125 MHz, Loctal base
- 3C4/DL96 – 200 mW AF power pentode, Miniature 7-pin base
- 3E5 – 200 mW AF beam power pentode, Miniature 7-pin base
- 3E6 – Sharp-cutoff pentode with internal shield tied to filament center-tap, Loctal base
- 3LF4 – 330 mW AF beam power pentode, Loctal base
- 3Q4/DL95 – 270 mW AF power pentode, Miniature 7-pin base
- 3S4/DL92 – 270 mW AF power pentode, 2.8 V/50 mA (series) or 1.4 V/100 mA (parallel) filament, Miniature 7-pin base
- 3S4-SF = 3S4T = 3W4 – 3S4/DL92 with a 2.8 V/25 mA (series) or 1.4 V/50 mA (parallel) filament
- 3S4-SF = 3S4T = 3W4 – 3S4/DL92 with a 2.8 V/25 mA (series) or 1.4 V/50 mA (parallel) filament
- 3V4/DL94 – 270 mW AF power pentode, Miniature 7-pin base
More of these tubes are listed as equivalents under M-P D - 1.4 V filament/heater
CRT anode rectifiers
- 3A3/3B2/3AW3 – CRT EHT rectifier for color TV, half-indirect (filament internally tied to cathode sleeve) 3.15 V/220 mA heater, Octal base
- 3A3A – 3A3 with increased anode current capability
- 3A3C – 3A3A retrofitted with an internal X-radiation shielding, introduced after the 1967 General Electric X-radiation scandal[67]
- 3AT2 – Compactron CRT EHT rectifier for color TV, half-indirect 3.15 V/220 mA heater
- 3AT2B – 3AT2 with internal X-radiation shielding
- 3AW2 – Compactron CRT EHT rectifier for color TV, half-indirect 3.15 V/350 mA heater
- 3AW2A – 3AW2 with internal X-radiation shielding
- 3BF2 - Compactron CRT EHT rectifier for color TV, indirect 3.6 V/225 mA heater
- 3BL2 – Compactron CRT EHT rectifier for color TV, 3.3 V/285 mA filament
- 3BL2A – 3BL2 with internal X-radiation shielding
- 3BM2 – Compactron CRT EHT rectifier for color TV, 3 V/300 mA filament
- 3BM2A – 3BM2 with internal X-radiation shielding
- 3BN2 – Compactron CRT EHT rectifier for color TV, half-indirect 3.15 V/300 mA heater
- 3BN2A – 3BN2 with internal X-radiation shielding
- 3BS2 – Compactron CRT EHT rectifier for color TV, half-indirect 3.15 V/480 mA quickstart heater
- 3BS2A, 3BS2B – 3BS2 with internal X-radiation shielding
- 3BT2 – Compactron CRT EHT rectifier for color TV, 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 color TV, 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 color TV, Octal base, half-indirect 3.6 V/225 mA heater
- 3CN3 – CRT EHT rectifier with a diffusion-bonded cathode for color TV, Octal base, half-indirect 3.15 V/480 mA quickstart heater
- 3CU3 – CRT EHT rectifier for color TV, Octal base, 3.15 V/280 mA filament
- 3CZ3 – CRT EHT rectifier for color TV, Octal base, half-indirect 3.15 V/480 mA quickstart heater
More of these tubes are listed as equivalents under M-P G - Miscellaneous
4 volt heater/filament tubes
Some 6-prefix tubes were also available as 4-prefix with a 4.2 V heater with 1.5 times the heater current, for television receivers with series heater strings (see below)
- 4 volt DC filament tubes
- 4A6G – Dual power triode, Octal base, directly heated with a center-tapped 4.0 V (series) resp. 2 V (parallel) filament
- 4A1 – 300 mA filament
5 volt heater/filament tubes
Some 6-prefix tubes were also available as 5-prefix, for television receivers with series heater strings (see below)
- 5 volt DC filament tubes
- 5A6 – RF beam power pentode up to 100 MHz, Noval base, directly heated with a center-tapped 5.0 V (series) resp. 2.5 V (parallel) filament
- Rectifiers
- 5AR4/GZ34 – 1.7 kV, 2×825 mA Full-wave rectifier
- 5AS4 – Full-wave rectifier; larger version of 5U4GB
- 5R4 – 2.8 kV, 2×325 mA Full-wave rectifier, avionics versions available
- 5U4G/GZ31 = 5Ц3С↦5C3S (5-pin Octal), 5X4G (8-pin Octal),5Z3 (4-pin) – 1.55 kV, 2×675 mA Full-wave rectifier
- 5V4/GZ32 – 1.4 kV, 2×525 mA Full-wave rectifier
- 5Y3 – 1.4 kV, 2×400 mA Full-wave rectifier; 80 with an Octal base
More of these tubes are listed as equivalents under M-P G - 5.0 V heater
6 volt heater tubes
Note: 6-prefix tubes with center-tapped heaters are listed under 300 mA series heater tubes
- 6A6 – Dual power triode, U7B 7-pin base, used as a Class-A audio driver or a Class-B audio output; 6.3 volt heater version of type 53 which had a 2.5 volt heater. Octal version: 6N7
- 6A7 (U7A 7-pin base) and 6A8 (K8A Octal base; PH4, M-OV/GEC X63) – Heptode pentagrid converter with control grid (#4 grid) on top cap; based on type 2A7, which had a 2.5 volt heater; Loctal version: type 7B8
- 6AB4/EC92 – High-μ triode, Miniature 7-pin base; 6C4/EC90 pinout except pin 5 unconnected
- 6AB5/6N5 – Top-view, "Magic Eye"-type tuning indicator with a sharp-cutoff driver triode
- 6AC5-G – 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; cf. 295, 2B6, 6AC6, 6B5, 6N6G Triple-Twin Darlington triodes
- 6AC6 – Triple-Twin AF signal + zero bias power triode with a common, single anode, internally connected as a cathode follower
- 6AC7 = 1852 – TV sharp-cutoff RF pentode, often encountered in a black metal envelope (not to be confused with the 6CA7/EL34)
- 6AC10 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 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 6.3 V/150 mA heater and an Octal base
Both 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/EF39 (reacting only to stronger signals) for the other - 6AE6-G – Split-anode driver triode for tuning indicators 6AD6-G and 6AF6-G, 6.3 V/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 for use as a cathode follower driver for two zero bias power triodes such as 6AC5 in push-pull service; cf. 295, 2B6, 6AC6, 6B5, 6N6G Triple-Twin Darlington triodes
- 6AF4/EC94 – UHF Medium-μ oscillator triode, commonly found in TV tuners and converters
- 6AF11 – Compactron Dual high-μ triode + sharp-cutoff pentode
- 6AG11 – Compactron Dual diode + dual high-μ triode
- 6AH5-G – Beam power tetrode for early TV use in some Philco receivers; 6L6-G with a different pinout
- 6AJ5 – Low (6.3-80 V) anode voltage, sharp-cutoff pentode
- 6AK5/EF95 = 6Ж1П↦6J1P (5654, CV4010, 408A) – VHF/RF/IF Sharp-cutoff pentode, Miniature 7-pin base, used in old Radiosonde weather balloon transmitters, receiver front ends and contemporary audio equipment
- 6AK6 – Power pentode, unusual low-power consumption output tube with 150 mA heater; 6G6-G with a Miniature 7-pin base
- 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, Noval base, triode μ = 70; 6T8 with a longer glass envelope
- 6AK9 – Compactron high-μ triode + medium-μ triode + beam power pentode
- 6AK10 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 6AL3/EY88 = 6Д20П↦6D20P – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap
- 6AL5/EAA91 = M-OV/GEC D77 = 6Х2П↦6H2P – Dual diode with separate cathodes, for use as detector. Often used in vacuum tube volt meters (VTVMs); 6H6 with a Miniature 7-pin base; 12AL5/HAA91, UAA91 or 3AL5/XAA91 with a different heater
- 6AL6-G – Beam power tetrode for early TV use; 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
- 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
- 6AN7/ECH80 – Triode/remote-cutoff hexode mixer; 6CU7/ECH42 with a Noval base
- 6AN8 – Triode + pentode used in CRT vertical deflection timebase circuits; electrically fairly similar to ECL80 but with a different pinout
- 6AQ5/EL90 (6П1П↦6P1P) – Beam power pentode, Miniature 7-pin; similar to type 6V6
- 6AQ8/ECC85 – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections, designed for use as oscillator and mixer in FM receivers. The heater to cathode insulation is inadequate for use in cascode operation; similar to 6BK7, 6BQ7, 6BZ7
- 6AR8, 6JH8, 6ME8 – Beam deflection tubes for use as NTSC chroma signal demodulators in analog color TV receivers
- 6AS6 = 6Ж2П↦6J2P (EF80) – Pentode with a fine-pitched suppressor grid for use as a second control grid, e.g. in radar phantastron circuits
- 6AS7 = 6Н5П↦6N5P, 6AS7G/ECC230 = 6Н13С↦6N13S (6080) – Dual low impedance, low-μ triode, mostly used for voltage regulation circuits
- 6AS11 – Compactron high-μ triode + medium-μ triode + sharp-cutoff pentode
- 6AT6/EBC90 – Common cathode dual diode + high-μ AF triode for use in FM ratio detectors, triode μ = 70; 6Q7 with a Miniature 7-pin base
- 6AU4 – 4.5 kV, 1.1 A CRT horizontal deflection output booster/damper/efficiency diode
- 6AU6/EF94, 6AU6A = 6Ж4П↦6J4P – Sharp-cutoff pentode
- 6AV6/EBC91 – Common cathode dual diode + high-μ AF triode for use in FM ratio detectors, triode μ = 100 (triode section similar in characteristics to one half of a 12AX7/ECC83); Miniature 7-pin version of type 75
- 6AV11 – Compactron Triple medium-μ triode
- 6AX4 – 4.4 kV, 137 mA CRT horizontal deflection output booster/damper/efficiency diode
- 6AX5 – 1.25 kV, 2×375 mA Full-wave rectifier, Octal base; similar in structure to type 6X5, but with higher voltage and current ratings which are comparable to those of types 5Y3 and 80
- 6B5 (UX6 base), 6N6G (Octal base) – Triple-Twin AF signal + 4-Watts zero bias power triode, internally connected as a cathode follower like today's Darlington transistors; cf. 295, 2B6, 6AC6
- 6B6-G – Dual diode + high-μ triode, grid on top cap; 75 with an Octal base, later 6SQ7 (without top cap), Miniature 7-pin version: 6AV6/EBC91
- 6B7 (UX7 base), 6B8 (EBF32, Octal base) – Dual diode + semiremote-cutoff pentode with control grid on top cap. The diodes were most commonly 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 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;[68] based on type 2B7 which had a 2.5 volt heater
- 6BA6/EF93 = M-OV/GEC W727 = 6К4П↦6K4P (5749) – Semiremote-cutoff RF pentode, popular in car radios
- 6BA11 – Compactron triode + split-anode pentode for use as TV vertical deflection oscillator and sync sep
- 6BC5 – Semiremote-cutoff RF pentode up to 400 MHz
- 6BC7 – Separate cathodes triple diode
- 6BD11 – Compactron high-μ triode + medium-μ triode + sharp-cutoff pentode
- 6BE6/EK90 = M-OV/GEC X727 = 6А2П↦6A2P (5750) – Heptode pentagrid converter, popular in car radios
- 6BF6 – Dual diode + medium-μ triode; 6R7 with a Miniature 7-pin base
- 6BF8 – Sextuple diode with a common cathode
- 6BG6 – Beam power pentode, anode on top cap, used in early TV magnetic-deflection horizontal-output stage
- 6BH11 – Compactron Dual medium-μ triode + sharp-cutoff pentode
- 6BK4 = 6С20С↦6S20S – High voltage beam power triode, Ua=27 kV, Ia=1.5 mA, Pa=25 W, Uh-c=-200 V, used as shunt regulator in color TV receivers and in measurement equipment such as high voltage meters
- 6BK4A – 6BK4 with Pa=30 W
- 6BK4B – 6BK4A with Pa=40 W, Uh-c=-450 V
- 6BK4C/6EL4A – 6BK4B retrofitted with an internal X-radiation shielding, introduced after the 1967 General Electric X-radiation scandal[67]
- 6BK7 – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections; similar to 6AQ8/ECC85, 6BQ7, 6BZ7
- 6BK8/6CF8/EF86 = M-OV/GEC Z729 – AF Pentode used in microphone preamplifiers and audiophile equipment
- 6BK11 – Compactron 2× High-μ + 1× medium-μ triple triode preamplifier, used in some guitar amps made by Ampeg
- 6BL6 (5836) – Sutton tube, a Reflex Klystron used as a 250 mW CW microwave source, 1.6 to 6.5 GHz depending upon an external cavity. 4-pin peewee base with cavity contact rings and top cap
- 6BL8/ECF80 = 6Ф1П↦6F1P – General-purpose triode + pentode used in TV, audio and test gear
- 6BM6 (5837) – Sutton tube used as a 150 mW CW microwave source, 550 MHz to 3.8 GHz depending upon an external cavity. 4-pin peewee base with cavity contact rings and top cap
- 6BM8/ECL82 = 6Ф3П↦6F3P – Triode + pentode used as driver and output stages in AF or TV vertical deflection amplifiers and has even been seen in an electronic nerve stimulator
- 6BN6/6KS6 = 6А3П↦6A3P, 6DT6 – Gated-beam discriminator pentode, used in radar, dual channel oscilloscopes and FM quadrature detectors 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;[69] cf. Nonode
- 6BQ5/EL84 = M-OV/GEC N709 = 6П14П↦6P14P – 5.7 Watts AF power pentode, Noval base
- 6BQ6-GT – Beam power pentode, used as a horizontal deflection output tube in monochrome TV receivers of the 1950s 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
- 6BQ6-GTB/6CU6 – Improved 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 stage; similar to 6AQ8/ECC85, 6BK7, 6BZ7
- 6BQ7A/ECC180 (6Н1П↦6N1P) – Improved 6BQ7 capable of operation at UHF frequencies
- 6BR7 – Low-microphonics AF pentode
- 6BU8, 6LE8 – Split-anode pentode for use as TV sync sep
- 6BX6/EF80 – Sharp-cutoff RF/IF/Video pentode, Noval base
- 6BY6 – Similar to type 6CS6/EH90, but with higher transconductance; 3BY6 with a different heater
- 6BY7/EF85 = M-OV/GEC W719 – Remote-cutoff RF pentode (TV IF)
- 6BZ6 – Sharp-cutoff RF pentode used in video IF circuits of the 1960s
- 6BZ7 – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections; similar to 6AQ8/ECC85, 6BK7, 6BQ7
- 6C4/EC90 – 3.6 W small-power VHF triode up to 150 MHz; single 12AU7/ECC82 system
- 6C6 (UX6 base), 6J7G/EF37 (Octal base) – Sharp-cutoff RF pentode, suppressor grid on a separate pin, control grid on top cap, for use as tuned RF amplifier or biased detector or AF amplifier, also used in test equipment; based on type 57, which had a 2.5 volt heater; similar to types 1603, 77 and Octal type 6SJ7 (control grid connection on pin 4)
- 6C10 – Compactron Triple high-μ triode – not related to the Mazda/EdiSwan 6C10 triode-hexode
- 6CA4/EZ81 – 1 kV, 2×450 mA Full-wave rectifier
- 6CA7/EL34 = 6П27С↦6P27S – AF power pentode
- 6CA11 – Compactron Dual high-μ triode + sharp-cutoff pentode
- 6CB6/EF190 – Remote-cutoff RF pentode used in video IF circuits of the 1950s and early 1960s
- 6CE5 – Semiremote-cutoff RF pentode
- 6CG7 – Dual triode used in TV and some audio amplifiers including modern solid-state designs, often as a cathode follower; similar to 6SN7
- 6CJ6/EL81 – CRT horizontal deflection output pentode
- 6CL6 – CRT cathode drive power pentode
- 6CM5/EL36 = 6П31С↦6P31S – AF or CRT horizontal deflection output beam power tetrode
- 6CW4 – Nuvistor High-μ VHF triode, 6.3 V/135 mA heater, most common one in consumer electronics
- 6CZ5 (6973) – Beam power pentode for use as vertical deflection or audio amplifier
- 6D4 – 25 mAavg, 100 mApeak Indirectly heated, argon triode thyratron, negative starter voltage, 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 (UX6 base), 6U7-G (Octal base) – Remote-cutoff RF pentode, suppressor grid on a separate pin, control grid on top cap, for use as an IF amplifier or as a mixer, also used in test equipment; based on type 58, which had a 2.5 volt heater; similar to types 78, 6K7/EF39 and 6SK7 (control grid connection on pin 4)
- 6D8-G – Heptode pentagrid converter, Octal base with 2nd control grid on top cap, 150 mA heater, used in pre-war 6-volt farm radios; similar to type 6A8
- 6D10 – Compactron Triple high-μ triode for use as oscillator, mixer, amplifier or AFC tube
- 6DA6/EF89 – RF Pentode used in AM/FM radios manufactured outside North America
- 6DJ8/ECC88 = 6Н23П↦6N23P = Shuguang 6N11 (↤6Н11) – Dual RF/AF triode for use in TV broadcast equipment, test gear, oscilloscopes and audiophile gear; similar to 6ES8/ECC189, 6922/E88CC
- 6DQ6 – Beam power pentode, used as a horizontal deflection output tube in monochrome TV receivers of the 1950s. Most often found in receivers with diagonal screen measurements larger than 17 in (43 cm). Smaller receivers often used similar type 6BQ6-GT. Also used as audio output tubes in Standel guitar amplifiers
- 6DQ6-B/6GW6 – 6DQ6 with higher ratings and a higher zero-bias anode current
- 6DR8/EBF83 – Common cathode dual diode + low (6.3-50 V) anode voltage pentode for use as IF amplifier, detector and AGC diode in vehicle equipment, Noval base
- 6DS4 – Nuvistor Semiremote-cutoff VHF triode used in TV tuners immediately prior to the introduction of solid state tuning circuits (RCA TVs equipped with a 6DS4 tuner bore the trademark "Nu-Vista Vision"); successor of the 6CW4
- 6DS8/ECH83 – Low (6.3-25 V) anode voltage, triode/heptode mixer, for use in vehicle equipment
- 6DT6 – See 6BN6/6KS6
- 6DV4 – Medium-μ Nuvistor triode for UHF oscillators; some versions had a gold-plated envelope
- 6DX8/ECL84 = 6Ф4П↦6F4P – TV sync sep triode + CRT cathode drive power pentode
- 6E5 – Top-view, "Magic Eye"-type tuning indicator, UX6 base; 6G5/6U5 with a sharp-cutoff driver triode; 2E5 with a different heater
- 6EM5 – CRT vertical deflection output pentode
- 6ES6/EF97 = 6К8П↦6K8P (remote-cutoff), 6ET6/EF98 (sharp-cutoff) – Low (6.3-50 V) anode voltage RF pentodes, used in car radios
- 6ES8/ECC189 – Dual triode used as RF cascode amplifier in TV tuners and VHF receiver front ends, also used as general-purpose dual triode in test gear; similar to 6DJ8/ECC88
- 6EZ8 – Triple high-μ VHF triode for use in FM tuners, Noval base, cathodes 1 and 2 and one side of the heater share pin 4
- 6F4 – Acorn UHF triode up to 1.2 GHz, for use as an oscillator
- 6F5 – High-μ triode, equal to triode section of type 6Q7
- 6F6 (metal envelope), 6F6-G (shouldered glass envelope; M-OV KT63), 6F6-GT (cylindrical glass envelope) – Power pentode, moderate power output rating – 9 watts max. (single-ended Class-A circuit); 11 watts max. (push-pull Class-A circuit); 19 watts max. (push-pull Class-AB2 circuit), sometimes used as a transformer-coupled audio driver for types 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; Octal base version of type 42
- 6F7 (UX7 base), 6P7-G (Octal base) – Common-cathode, remote-cutoff pentode + medium-μ triode with the pentode control grid on top cap, for use as triode/pentode mixer/oscillator, or as combination IF amplifier (pentode) and AM detector or AF amplifier (triode)
- 6FA7 – Diode + sharp-cutoff dual-anode tetrode for use as frequency divider or complex-wave generator, 6.3 V/300 mA heater, Noval base
- 6FH8 – Medium-μ triode + three-anode sharp-cutoff tetrode for use in TV receivers and complex wave generators
- 6FS5, 6GU5 – Sharp-cutoff, Shadow-Grid beam pentodes with a beam-forming extra grid between control and screen grids, intended to reduce screen current and hence anode/screen grid distribution noise (technically a hexode), Miniature 7-pin base; cf. DAH50, EF8, EF38
- 6G5/6U5 (UX6 base), 6G5G/6U5G (Octal base) – Top-view, "Magic Eye"-type tuning indicator; 6E5 with a remote-cutoff driver triode; 2G5 with a different heater
- 6G6-G – Power pentode. Octal base. Low power output – 1.1 watt max. output. Has 150 mA heater. Used in pre-war 6-volt farm radios; Miniature 7-pin version: 6AK6
- 6G8-G – Dual diode + sharp-cutoff pentode, used as detector and first AF stage in Australian 1940s radios
- 6GK5 – Miniature 7-pin VHF triode, used as VHF local oscillator in some TV turret tuners
- 6GM5 – 19 W Beam power pentode; 7591 or 7868 with a Noval base
- 6GS8 – Dual-anode pentode for TV receiver sync sep or AGC service
- 6GV8/ECL85 = 6Ф5П↦6F5P – Triode + power pentode for use as CRT vertical deflection output
- 6GW8/ECL86 – AF Triode + power pentode for use as audio or CRT vertical deflection output
- 6GY8 – Triple high-μ VHF triode for use as Autodyne or AFC circuit in FM tuners, Noval base, cathode 3, control grid 1 and one side of the heater share pin 4
- 6H5 – Top-view, "Magic Eye"-type tuning indicator, UX6 base; 6G5/6U5 with an extra grid tied to the cathode and a fixed 90° shadow oppopsite the controllable one
- 6H6 = 6Х6С↦6H6S (EB34, M-OV/GEC D63, RFT HF/OSW3109) – Dual diode, Octal base. Most commonly found as a "stubby" metal envelope tube. Glass versions 6H6-G and 6H6-GT are also found
- 6HS8, 6MK8 – Dual-anode pentode for TV receiver sync sep service or as a two-channel VCA
- 6J5 = 6С2Б↦6S2B (M-OV/GEC L63), 6J5GT = 6С2С↦6S2S – Indirectly heated medium-μ triode; 12J5GT with a different heater
- 6J6/ECC91 – Dual VHF triode with common cathode up to 600 MHz, Miniature 7-pin base
- 6J7G/EF37 – See 6C6
- 6J8-G – Triode/heptode mixer
- 6J9 – Triple VHF triode for use as Autodyne mixer in FM tuners, Noval base with an additional center pin 10 for cathodes 1 and 2
- 6J10/6Z10 – Compactron Quadrature detector pentode + power pentode, used as FM audio demodulator and power stage; cf. 6BN6/6KS6, 6DT6, nonode
- 6JH8 – See 6AR8
- 6JU8A – 9 mA Quad diode, units 1&2 and 3&4 internally series-connected, for use in FM-stereo demuxers or in phase detectors
- 6K6-G – Power pentode, low-to-moderate power output rating: 0.35 to 4.5 watts (single-ended Class-A circuit), 10.5 watts max. (push-pull Class-A circuit); Octal version of type 41
- 6K7/EF39 – Remote-cutoff RF pentode, control grid on top cap. Most common commercial uses were as an IF amplifier or as a superheterodyne mixer. Also used in test equipment; Octal version of type 78, later 6SK7 (control grid connection on pin 4)
- 6K8 – American triode/hexode mixer, 1938; 12K8 with a different heater
- 6K11/6Q11 – Compactron 2× High-μ + 1× medium-μ triple triode for use as a sync clipper and gated AGC amplifier in TV receivers
- 6KM8 – Diode + three-anode sharp-cutoff tetrode for use in musical instruments, frequency dividers and complex wave generators
- 6KS6 – See 6BN6/6KS6
- 6L4 – Acorn UHF triode for use as an oscillator
- 6L5-G – Medium-μ triode available only in ST envelope; similar to 6J5-G
- 6L6 (EL37) – Beam power tetrode
- There are several variations. Except for types 6L6-GC and 6L6-GX, all have the same maximum output ratings:
- 11.5 watts (single-ended Class-A circuit)
- 14.5 watts (push-pull Class-A circuit)
- 34 watts (push-pull Class-AB1 circuit)
- 60 watts (push-pull Class-AB2 circuit)
- 6L6 (metal envelope) and 6L6-G (shouldered glass envelope) were used in pre-World War II radios and Public Address amplifiers
- 6L6 and 25L6 were introduced in 1935 as the first 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 (Type 6W6-GT is the 6.3 volt heater version of types 12L6-GT, 25L6-GT and 50L6-GT)
- 6L6GA – Post-war version of type 6L6-G, in smaller ST-14 shape with Shouldered Tubular (ST) shaped envelope, revision A
- 6L6GB – Post-war improved version in a cylindrical glass envelope; similar to type 5881
- 6L6GTB – 6L6 with Glass Tubular envelope, revision B, (higher power rating, as it happens. The 6L6GTB can always replace the 6L6, 6L6G, and 6L6GT, but a 6L6GTB running at maximum rating should not be replaced with another subtype)
- 6L6-WGB – "Industrial" version of type 6L6GB
- 6L6GC – Final and highest-powered audio version of the tube. Max. outputs:
- 17.5 watts (single-ended Class-A circuit)
- 32 watts (push-pull Class-A circuit)
- 55 watts (push-pull Class-AB1 circuit)
- 60 watts (push-pull Class-AB2 circuit)
- 6L6-GX – Class-C oscillator/amplifier used in transmitters, low loss ceramic base for improved RF performance, max. output 30 watts
- 6L7 – Heptode pentagrid converter often used in console radios of the late 1930s. Because of low conversion transconductance, radios using type 6L7 typically have either a tuned RF pre-amplifier stage, or at least two stages of IF amplification (a few models have both); similar in structure to heptodes 6SA7 and 6BE6, except that a separate oscillator – usually type 6C5 – is required, as #1 grid is the remote-cutoff RF signal input grid and #3 grid is the oscillator input grid (in types 6SA7 and 6BE6, #1 grid is the internal oscillator grid, #3 grid is the signal input grid)
- 6LE8 – See 6BU8
- 6LF6 – Compactron Beam power tetrode with an anode cap, for CRT horizontal deflection amplifiers
- 6M5/EL80 – AF power pentode used as Class-A or AB output stages of 1950s Australian radiograms; similar to 6BQ5
- 6M11 – Compactron Dual triode + pentode
- 6MD8 – Triple medium-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers, B9E Novar 9-pin base
- 6ME5 – Top-view, "Magic Eye"-type tuning indicator, Miniature 7-pin base
- 6ME8 – See 6AR8
- 6MK8 – See 6HS8
- 6MJ8 – Compactron Triple medium-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 6MN8 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 6N3/EY82 – 850 V, 360 mA Half-wave rectifier
- 6N5 = 6AB5/6N5
- 6N6G – See 6B5
- 6N7, 6N7-G, 6N7-GT = 6Н7С↦6N7S – Dual power triode, used as Class-A audio driver or as Class-B power output, max. output (Class-B): 10 watts; 6A6 with an Octal base
- 6N8/EBF80 – Dual diode + remote-cutoff pentode for use as detector plus RF or AF amplifier in radios
- 6P5-G/GT – Medium-μ triode, often used as cathode follower driver for the 6AC5-G zero bias power triode; Octal version of type 76
- 6P7-G – Rarely seen Octal version of type 6F7
- 6Q5-G = 884 – Triode gas thyratron used in DuMont oscilloscopes as a sweep generator; 2B4 = 885 with a 6.3 V/600 mA heater and an Octal base
- 6Q11 = 6K11/6Q11
- 6R3/EY81 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap
- 6R7, 6R7-G, 6R7-GT – Dual diode + medium-μ triode, Octal base with top cap, μ = 16; Miniature 7-pin version: 6BF6
- 6S7-G – Remote-cutoff RF pentode, Octal base with control grid on top cap, 150 mA heater, used in pre-war 6-volt farm radios; similar to type 6K7
- 6S8-GT – Triple diode + high-μ triode, Octal base with triode grid on top cap. Has three identical diodes – two diodes share a cathode with the triode, one has a separate cathode. Used as a combined AM detector/AVC rectifier/FM ratio detector/AF amplifier in AM/FM radios. Typically, all sections of this tube are arranged around a single heater
- 6SA7 – First heptode pentagrid converter, Octal base; Miniature 7-pin version: 6BE6
- 6SB7Y (Octal base), 6BA7 and 12BA7 (Noval base) – VHF heptode pentagrids, 1946
- 6SC7 – Common cathode dual high-μ triode
- 6SK7 = 6К3П↦6K3P – Remote-cutoff pentode used in IF stages of North American radios; Miniature 7-pin version: 6BD6
- 6SL7/ECC35 (6Н9С↦6N9S) – General purpose dual triode
- 6SN7/ECC32 (6Н8С↦6N8S, M-OV/GEC B65, Brimar 13D2, CV1986, 6042, 6180) – Dual medium-μ triode, each section is equivalent to a 6J5, used in audio amplifiers, Hammond organs, television, and extensively in World War II radar; Noval version: 12AU7
- 6SR7 – Dual diode + triode; 12SR7 with a different heater
- 6SS7 – Remote-cutoff pentode, 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; 6SK7 with a 150 mA heater
- 6T5 – Top-view, "Magic Eye"-type tuning indicator with a remote-cutoff driver triode, UX6 base; 6G5/6U5 with a ring-shaped indicating area that varies its inner diameter with the signal strength
- 6T7-G – Dual diode + high-μ triode, Octal base with control grid on top cap, 150 mA heater, used in pre-war farm radios; similar to type 6Q7
- 6T8 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in North American AM/FM radios; 6AK8/EABC80 with a shorter glass envelope
- 6U5 = 6G5/6U5
- 6U7-G – See 6D6
- 6U8/ECF82 – Triode + pentode, Noval base, for use as audio preamplifier
- 6U10 – Compactron 1× High-μ + 2× medium-μ triple triode
- 6V4/EZ80 – 1 kV, 2×45 mA Full-wave rectifier, indirectly heated, Noval base
- 6V6 – Beam power tetrode, used in single-ended Class-A audio output stages of radios and sometimes seen in Class-B audio amplifiers; 5V6 or 12V6 with a different heater; electrically similar to 6AQ5/EL90
- 6V6G – 6V6 with Shouldered Tubular (ST) shaped envelope
- 6V6GT – 6V6 with Glass Tubular envelope
- 6V7-G – Dual diode + medium-μ triode, μ = 8.3; Octal version of type 85, similar to type 6R7
- 6W6-GT – Beam power pentode, used most often as a vertical deflection output tube in monochrome TV receivers of the 1950s. Can also used as an audio output tube; 12L6-GT or 25L6-GT or 50L6-GT with a 6.3 volt heater
- 6X4/EZ90 = 6Ц4П↦6C4P (Miniature 7-pin base) and 6X5/EZ35 (Octal base) – 1.25 kV, 2×210 mA Full-wave rectifiers with indirectly heated common cathode, based on type 84/6Z4
More of these tubes are listed as equivalents under M-P E - 6.3 V heater
7 prefix - Loctal tubes
These tubes all have 6.3 V heaters despite the 7-prefix, intended to indicate a Loctal base. Actual 7V heater tubes are listed below as series heater tubes
- 7A4 – Medium-μ triode; Loctal version of type 6J5, often numbered 7A4/XXL
- 7A5 – Beam power pentode; Loctal version of type 6U6GT
- 7A6 – Dual detector diode; similar to type 6H6
- 7A7 – Remote-cutoff pentode; Loctal version of type 6SK7
- 7A8 – The only octode pentagrid converter produced in America by Sylvania, 1939. Used mostly in Philco radios
- 7AB7 – Sharp-cutoff pentode
- 7AD7 – Power pentode
- 7AF7 – Dual medium-μ triode
- 7AG7 – Sharp-cutoff pentode
- 7AH7 – Remote-cutoff pentode
- 7AJ7 – Sharp-cutoff pentode
- 7AK7 – Sharp-cutoff, dual-control pentode for computer service. Perhaps the first active device specifically designed for computer use
- 7B4 – High-μ triode; Loctal version of types 6F5 and 6SF5
- 7B5 – Power pentode; Loctal version of types 6K6 and 41
- 7B6 – Dual detector diode + high-μ triode; Loctal version of type 75, similar to types 6AV6/EBC91 and 6SQ7
- 7B7 – Remote-cutoff pentode
- 7B8 – Heptode pentagrid converter; Loctal version of types 6A7 and 6A8
- 7C4 – High frequency diode
- 7C5 – Beam power pentode; Loctal version of type 6V6
- 7C6 – Dual detector diode + high-μ triode
- 7C7 – Sharp-cutoff pentode
- 7E5 – Medium-μ RF triode
- 7E6 – Dual detector diode + medium-μ triode; Loctal version of types 6R7 and 6SR7; Miniature 7-pin version: 6BF6
- 7E7 – Dual detector diode + semiremote-cutoff pentode; similar to types 6B7 and 6B8
- 7F7 – Dual high-μ triode; Loctal version of type 6SL7-GT
- 7F8 – Medium-μ VHF triode, used as FM RF amplifier and converter
- 7G7 – Sharp-cutoff pentode
- 7G8 – Dual sharp-cutoff tetrode
- 7H7 – Semiremote-cutoff pentode
- 7J7 – Triode/heptode mixer; similar to type 6J8-G
- 7K7 – Dual detector diode + high-μ triode; similar to types 6AT6/EBC90 and 6Q7
- 7L7 – Sharp-cutoff pentode
- 7N7 – Dual medium-μ triode; Loctal version of type 6SN7-GT
- 7Q7 – Heptode pentagrid converter; similar to type 6SA7
- 7R7 – Dual detector diode + remote-cutoff pentode
- 7S7 – Triode/heptode mixer
- 7T7 – Sharp-cutoff pentode
- 7V7 – Sharp-cutoff pentode
- 7W7 – Sharp-cutoff pentode
- Note: Types 7V7 and 7W7 are electronically identical except for base connections of pins 4, 5 and 7. On type 7V7, the suppressor grid is connected to pin 4, an internal shield is connected to pin 5, and the cathode is connected to pin 7. On type 7W7, the suppressor grid and internal shield are connected to pin 5, and the cathode is connected to pins 4 and 7. All other pin connections are the same. If interchanging these tube types is necessary, confirm that pins 4 and 7 are connected at the socket. Pin 5 is usually connected to the chassis.
- 7X6 – Dual rectifier with separate cathodes for use as a voltage doubler
- 7X7 – Dual detector diode + high-μ triode on separate cathodes, used as FM ratio detector and AF amplifier, often numbered 7X7/XXFM
- 7Y4 – Full-wave rectifier
- 7Z4 – Full-wave rectifier
12 volt heater tubes
For fixed/mobile equipment
Many of these tubes have a 150 mA heater and so were popular in AA5 radio receivers; some have 300, 450 or 600 mA heaters for use in TV receivers
- 12A7 – Half-wave rectifier + power pentode, UX7 base with top cap. Pentode section is similar to type 38. Rectifier has a low power rating – 120 V/30 mA – that limits the number of tubes that can be connected to its B+ circuit. Used in one-tube portable phonographs and a few two- and three-tube radios; forerunner of such types as 32L7-GT, 70L7-GT and 117L7-GT. Not related to types 2A7 and 6A7
- 12AB5 – Beam power tetrode[70]
- 12AC10 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 12AE10 – Compactron Beam power tetrode + sharp-cutoff pentode[70]
- 12AH7GT = 12Н11С↦12N11S – Dual medium-μ triode, 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 different heater
- 12AT6/HBC90 – Dual diode + triode (Commonly replaced by 12AV6/HBC91 in consumer radios)
- 12AV6/HBC91 – Dual diode + high-μ triode; 6AV6/EBC91 with a different heater
- 12BA6/HF93 – Remote-cutoff pentode; 6BA6/EF93 with a different heater
- 12BE6/HK90 – Heptode pentagrid converter; 6BE6/EK90 with a different heater
- 12DT5 – Beam power tetrode, Noval base; 6DT5 or 25DT5 with a different heater
- 12DT6 – Quadrature detector pentode used in FM audio demodulators; 6DT6 with a different heater, cf. 6BN6, nonode
- 12FQ8 – Common cathode, dual split-anode triode for use in musical instruments, frequency dividers and complex wave generators[71]
- 12J5WGT – Indirectly heated medium-μ triode; 6J5WGT with a different heater
- 12L6GT – Beam power tetrode, 6W6GT, 25L6GT or 50L6GT with a different heater
- 12L8GT – Common cathode dual power pentode, Octal base, for use as a parallel-connected or push-pull output stage
- 12MD8 – Triple medium-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers, B9E Novar 9-pin base
- 12MN8 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 12SA7 – Heptode pentagrid converter; 12BE6/HK90 with an Octal base
- 12SC7 = 12Н10С↦12N10S – Dual high-μ triode, 12.6 V/150 mA heater, for use as AF amplifier or phase inverter
- 12SF7GT – Diode + pentode
- 12SK7 – Remote-cutoff pentode; 12BA6/HF93 with an Octal base
- 12SQ7 – Dual diode + triode; 12AV6/HBC91 with an Octal base
- 12U5G – Tuning indicator; 6U5G with a different heater
- 12X4 – Full-wave rectifier, Miniature 7-pin base; 6X4/EZ90 with a different heater
- 12Z3 – Half-wave rectifier, UX4 base
—with a center-tapped heater, used in:
- Dual-system (6V and 12V) car radios,
- 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 for use as vertical deflection amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
- 12A5 – Power pentode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, UX7 base. Mostly used in pre-war car radios
- 12AD7 – Dual high-μ triode, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base
- 12AT7/ECC81 = M-OV/GEC B309 (6060, 6201, M8162) – Dual high-μ triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater. Commonly used as RF amplifier/mixer in VHF circuits[70]
- 12AU7/ECC82 = M-OV/GEC B329 (6067, 6189, M8136) – Dual medium-μ triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater.[70] Two 6C4/EC90s in one envelope;[72] however, it is only specified as an audio frequency device. Commonly used in audio applications and TV receivers
- 12AV7 (5965) – Dual medium-μ triode with a center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater. Principally designed for VHF amplifier/mixer operation[73]
- 12AX7/ECC83 = M-OV/GEC B339 (6Н2П↦6N2P, 6057, 6681, M8137) – Dual high-μ triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater. Very similar to triode section of 6AV6/EBC91. Commonly used in high-gain audio stages[70]
- 12AY7 – Dual triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater. Medium gain but low noise, intended for low-level/preamplifier use[70]
- 12AZ7 – Dual medium-μ triode with a center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base, for use as AF Amplifier, or combined oscillator and mixer[74][70]
- 12B4A – Power triode with a center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base[70]
- 12BH7 – Dual medium-μ power triode with a center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater[75][70]
- 12BR7 – Dual diode + triode with a center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater; 9BR7 with a different heater
- 12BV7, 12BY7/EL180, 12DQ7 – CRT cathode drive power pentodes with a center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater[76]
- 12BZ7 – Dual high-μ triode for use as sync sep and amplifier, 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, center-tapped 12.6 V/450 mA resp. 6.3 V/900 mA heater, Noval base, for use as a voltage doubler
- 12DF7 – Dual triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base; low-microphonics version of 12AX7
- 12DM7 – Dual high-μ triode, low hum, center-tapped 12.6 V/130 mA resp. 6.3 V/260 mA heater, Noval base
- 12DQ7 – CRT cathode drive beam power pentode, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
- 12DT7 – Dual high-μ AF triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base
- 12DW7/ECC832 (7247) – Dual dissimilar AF triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater; one half 12AX7-type triode, other half 12AU7-type triode
- 12GN7/12HG7 – Sharp-cutoff pentode for use as video amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
- 12H4 – Triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Miniature 7-pin base
- 12HL7 – Sharp-cutoff pentode for use as video amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base
For mobile equipment
- 12AC6 – Low (12.6-30 V) anode voltage remote-cutoff pentode, 12.6 V/150 mA heater, Miniature 7-pin base
- 12AD6 – Low (10.0-15.9 V) anode voltage sharp-cutoff heptode pentagrid converter
- 12AE7 – Low (12.6-16 V) anode voltage dissimilar (medium-μ + low-μ) triodes, 12.6 V/450 mA heater, Noval base
- 12AG6 – Low (12.6-16 V) anode voltage heptode pentagrid converter, 12.6 V/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, 12.6 V/550 mA heater, Noval base
- 12CX6 – Low (12.6-33 V) anode voltage sharp-cutoff pentode, 12.6 V/150 mA heater, Miniature 7-pin base
- 12DE8 – Diode + low (12.6-30 V) anode voltage, remote-cutoff pentode, 12.6 V/200 mA heater, Noval base
- 12DK7 – Dual diode + low (12.6-30 V) anode voltage power tetrode, 12.6 V/500 mA heater, Noval base
- 12DL8 – Dual diode + low (12.6-30 V) anode voltage power tetrode with a space charge grid, 12.6 V/550 mA heater, Noval base
- 12DS7 – Dual diode + low (12.6-16 V) anode voltage power tetrode, 12.6 V/400 mA heater, Noval base
- 12DU7 – Dual diode + low (12.6-16 V) anode voltage power tetrode, 12.6 V/250 mA heater, Noval base
- 12DV7 – Dual diode + low (12.6-16 V) anode voltage triode, 12.6 V/150 mA heater, Noval base
- 12DV8 – Dual diode + low (12.6-16 V) anode voltage power tetrode with a space charge grid, 12.6 V/375 mA heater, Noval base
- 12DW8 – Diode + dual dissimilar, low (12.6-16 V) anode voltage triode, 12.6 V/450 mA heater, Noval base
- 12DY8 – Low (12.6-16 V) anode voltage medium-μ triode + remote-cutoff pentode, 12.6 V/350 mA heater, Noval base
- 12DZ6 – Low (12.6-16 V) anode voltage RF pentode, 12.6 V/190 mA heater, Miniature 7-pin base
- 12EA6 – Low (12.6-16 V) anode voltage IF pentode, 12.6 V/175 mA heater, Miniature 7-pin base
- 12EC8 – Low (12.6-16 V) anode voltage medium-μ triode + semiremote-cutoff pentode, 12.6 V/225 mA heater, Noval base
- 12EG6 – Low (12.6-30 V) anode voltage heptode pentagrid converter, both control grids #1 and #3 are sharp-cutoff, 12.6 V/150 mA heater, Miniature 7-pin base
- 12EL6 – Dual diode + low (12.6-30 V) anode voltage, high-μ triode, 12.6 V/150 mA heater, Miniature 7-pin base
- 12EM6 – Diode + low (12.6-30 V) anode voltage power tetrode, 12.6 V/500 mA heater, Noval base
- 12FA6 – Low (12.6-30 V) anode voltage heptode pentagrid converter, 12.6 V/150 mA heater, Miniature 7-pin base; car radio version of 12BE6/HK90
- 12FM6 – Dual diode + low (12.6-30 V) anode voltage, medium-μ triode, 12.6 V/150 mA heater, Miniature 7-pin base
- 12FR8 – Diode + low (12.6-16 V) anode voltage triode + pentode for use as IF/AF amplifier and detector, 12.6 V/320 mA heater, Noval base
- 12FT6 – Dual diode + low (12.6-30 V) anode voltage triode for use as detector and AF Amplifier, 12.6 V/150 mA heater, Miniature 7-pin base
- 12FX8 – Low (12.6-16 V) anode voltage triode/heptode mixer, 12.6 V/270mA heater, Noval base
- 12GA6 – Low (12.6-16 V) anode voltage heptode pentagrid converter, 12.6 V/150 mA heater, Miniature 7-pin base; similar to type 12FA6, but with lower conversion transconductance
- 12J8 – Dual diode + low (12.6-30 V) anode voltage power tetrode, 12.6 V/325 mA heater, Noval base
- 12K5 – Low (12.6-30 V) anode voltage power tetrode with a space charge grid, 12.6 V/400 mA heater, Miniature 7-pin base; cf. 13П1С, Shuguang 13P1P
- 12SW7 – Dual diode + low (26.5-250 V) anode voltage triode, 12.6 V/150 mA heater, Octal base
- 12SX7GT – Dual low (26.5-300 V) anode voltage triode, 12.6 V/300 mA heater, Octal base
- 12SY7 – Low (26.5-300 V) anode voltage pentagrid converter, 12.6 V/150 mA heater, Octal 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
14 prefix - Loctal tubes
These tubes all 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 14V heater tubes are listed below as series heater tubes
- 14A4 – Medium-μ triode; Loctal version of type 12J5
- 14A5 – Beam power pentode
- 14A7 – Remote-cutoff pentode, often numbered 14A7/12B7
- 14AF7 – Dual medium-μ triodes, often numbered 14AF7/XXD
- 14B6 – Dual detector diode + high-μ triode; similar to types 12AV6/HBC91 and 12SQ7
- 14B8 – Heptode pentagrid converter; Loctal version of type 12A8
- 14C5 – Beam power pentode; Loctal version of type 12V6-GT
- 14C7 – Sharp-cutoff pentode
- 14E6 – Dual detector diode + medium-μ triode; Loctal version of 12SR7
- 14E7 – Dual detector diode + semiremote-cutoff pentode; similar to type 12C8
- 14F7 – Dual high-μ triode; Loctal version of type 12SL7-GT
- 14F8 – Medium-μ high frequency triode, used as FM RF amplifier and converter
- 14H7 – Semiremote-cutoff pentode
- 14J7 – Triode/heptode mixer
- 14N7 – Dual medium-μ triode; Loctal version of type 12SN7-GT
- 14Q7 – Heptode pentagrid converter; similar to type 12SA7
- 14R7 – Dual detector diode + remote-cutoff pentode
- 14S7 – Triode/heptode mixer
- 14W7 – Sharp-cutoff pentode
- 14X7 – Dual detector diode + high-μ triode on separate cathodes, used as FM ratio detector and AF amplifier
- 14Y4 – Full-wave rectifier
25 volt series heater tubes
- For AA5 radio receivers with 150 mA series heater strings
- 25F5 – Beam power pentode; 50C5 with half the heater power, allowing for push-pull output stages with the heater spec of a single 50C5
- For AA5 radio receivers with 300 mA series heater strings
- 25A6 – Power pentode, Octal version of type 43
- 25B5 (UX6 base), 25N6G (Octal base) – Triple-Twin AF signal + 4-Watts zero bias power triode, internally connected as a cathode follower like today's Darlington transistors; 6B5 resp. 6N6G with a different heater
- 25C5 – Beam power pentode; 50C5 with a different heater
- 25L6 – Beam power pentode; 12L6 or 50L6 with a different heater; besides AA5, also popular for high-speed gating, or as a relay or keypunch solenoid driver, in early computers such as the UNIVAC I, where the heater ran off the equipment's 24-volts supply bus. As the 25L6GT 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
- 25Z5 – Dual 700 V, 450 mA rectifier with separate cathodes for use as a voltage doubler
- 25Z6 – 25Z5 with an Octal base
35 volt series heater tubes
- For AA5 radio receivers with 150 mA series heater strings
- 35A5 – Beam power tetrode, Loctal base; similar to 35L6
- 35B5 – Beam power tetrode
- 35C5 – 35B5 with a revised pinout to address concerns that high peak voltage between 4 (heater) and 5 (anode) would promote socket breakdown[77]
- 35DZ8 – High-μ triode + power pentode, used for audio; similar to 35HB8
- 35HB8 – Triode + beam power tetrode, used primarily as both the audio preamplifier and output
- 35L6-GT – Beam power pentode similar to, but not electronically identical to, types 12L6-GT, 25L6-GT and 50L6-GT
- 35W4 – Half-wave rectifier with a heater tap for a pilot lamp
- 35Y4 – Half-wave rectifier with a heater tap for a pilot lamp, Loctal base; similar to 35Z5
- 35Z3 – Half-wave rectifier, Loctal base; similar to 35Z4
- 35Z4-GT – Half-wave rectifier
- 35Z5-GT – 35Z4-GT with a heater tap for a pilot lamp
50 volt series heater tubes
- For AA5 radio receivers with 150 mA series heater strings
- 50A5 – Beam power tetrode, Loctal base; similar to 50L6
- 50B5 – Beam power tetrode, 35B5 with a 50 volt heater
- 50C5 – 50B5 with a revised pinout to address concerns that high peak voltage between 4 (heater) and 5 (anode) would promote socket breakdown[77]
- 50DC4 – Half-wave rectifier, 35W4 with a 50 volt heater
- 50EH5 – Beam power tetrode, some radios that use this tube do not have an audio amplifier section; similar to 50C5 but with higher gain
- 50HK6 – Power pentode with a heater tap for a pilot lamp
- 50L6 – Beam power tetrode, 12L6 or 25L6 with a 50 volt heater
- 50X6 (Loctal base), 50Y7GT (Octal base, heater tap for a pilot lamp) – Dual rectifier with separate cathodes for use as a voltage doubler
117 volt heater tubes
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
Rectifier and beam power pentode
- 117L7GT = 117M7GT – Half-wave rectifier + beam power pentode
- 117N7GT – Half-wave rectifier + beam power pentode
- 117P7GT – Half-wave rectifier + beam power pentode
Rectifiers
- 117Z3 – Half-wave rectifier; 117Z4GT with a Miniature 7-pin base
- 117Z4GT – Half-wave rectifier
- 117Z6GT – Dual rectifier with separate cathodes for use as a voltage doubler; some versions have a center-tapped heater that can also be wired for 150 mA/58.5 V
100 mA series heater tubes
Used in radio receivers with series heater strings
- 18FX6 – Heptode pentagrid converter; 6BE6/EK90 or 12BE6/HK90 with an 18 V heater
- 18FY6 – Dual diode + triode; 6AV6/EBC91 or 12AV6/HBC91 with an 18 V heater
- 34GD5 – Beam power tetrode; 35C5 or 50C5 with a 34 V heater
- 36AM3 – Half-wave rectifier; 35W4 with a 36 V heater
- 60FX5 – AF power pentode; 12FX5 or 19FX5 with a 60 V heater
More of these tubes are listed as equivalents under M-P U - 100 mA heater
150 mA series heater tubes
Used in AA5 radios, and semi-transistorized TV receivers with series heater strings
- 14GT8/7724, 14JG8 – Dual diode + high-μ triode for use as FM detector and AF amplifier
- 17EW8/HCC85 – Dual triode for use as VHF oscillator/mixer up to 200 MHz, Noval base; 6AQ8/ECC85, 9AQ8/PCC85 or UCC85 with a 17.5 V heater
- 19T8/HABC80 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war AM/FM radios; 5T8, 6T8, 6AK8/EABC80, 9AK8/PABC80 or 27AK8/UABC80 with an 18.9 V heater
- 40B2 – 20 to 60 V Barretter, Octal base, to stabilize against mains voltage fluctuations
- 50JY6 – Horizontal deflection beam power pentode
- 56R9 – Compactron AF triode + beam power pentode, separate heaters for triode (14 V) and pentode (42 V) for flexibility with the series string order
- 70A7, 70L7 – Half-wave rectifier + beam power pentode
More of these tubes are listed as equivalents under M-P H - 150 mA heater
300 mA series heater tubes
Most are series heater versions of respective 6-prefix tubes; used in TV receivers with series heater strings
- 4HK5 – VHF frame-grid, vari-μ triode; 2HK5, 3HK5 or 6HK5 with a 4.0 V heater
- 6AU7 – Dual medium-μ AF triode; 12AU7/ECC82 with a center-tapped 300 mA/6.3 V (series) resp. 600 mA/3.15 V (parallel) heater
- 6AX7 – Dual high-μ AF triode; 12AX7/ECC83 with a center-tapped 300 mA/6.3 V resp. 600 mA/3.15 V heater
- 6CN7 – Dual common cathode diode + triode for use as horizontal phase detector and reactance tube in TV receivers; 8CN7 with a center-tapped 300 mA/6.3 V resp. 600 mA/3.15 V heater
- 7AU7/XCC82 – 6AU7 Dual triode with a center-tapped 300 mA/7.0 V resp. 600 mA/3.5 V heater
- 42A1 (141 Ω), 49A1 (162 Ω), 55A1 (183 Ω), 80A1 (266 Ω), 86A1 (287 Ω), 92A1 (308 Ω) – Straight ballast resistors, Octal base, for use in areas with a stable power grid
- 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
- 50A2 (with tap for 2 pilot lamps), 50B2 (with tap for 1 pilot lamp) – 50 V Barretter, 4-pin base, to stabilize against mains voltage fluctuations
- 58HE7 – Compactron High-perveance horizontal deflection output booster/damper/efficiency diode + beam power pentode; 6HE7, 12HE7 or 38HE7 with a 58 V heater
More of these tubes are listed as equivalents under M-P P - 300 mA heater
450 mA series heater tubes
Most are series heater versions of respective 6-prefix tubes; used in TV receivers with series heater strings
- 2CW4 – Nuvistor High-μ VHF triode, 6CW4 with a 2.1 V heater
- 2EN5 – Dual diode
- 4BN6 – Gated-beam discriminator pentode, used in FM quadrature detectors; 3BN6, 6BN6, 12BN6 with a 4.2 V heater
- 4CB6 – Sharp-cutoff pentode
- 4DT6 – Quadrature detector pentode used in FM audio demodulators; 3DT6, 6DT6 with a 4.2 V heater
- 5HC7 – Compactron Dual dissimilar triode for use as sync clipper and AGC amplifier; 4HC7 with a 5.6 V heater
- 7KY6 – Sharp-cutoff frame-grid pentode with a 7.3 V heater for use as video output tube in TV receivers, Noval base[78]
- 8AC10 – Compactron Triple high-μ triode for use as NTSC chroma signal demodulator matrix in analog color TV receivers
- 8B10 – Compactron Dual diode + dual triode
- 8CG7/8FQ7 – Dual triode; 6CG7/6FQ7, 12FQ7 with an 8.4 V heater
- 8CN7 – Dual common cathode diode + triode for use as horizontal phase detector and reactance tube in TV receivers; 6CN7 with a center-tapped 225 mA/8.4 V (series) resp. 450 mA/4.2 V (parallel) heater
- 11DS5 – Beam power tetrode; 50B5 or 35B5 with an 11.2 V heater
- 13J10/13Z10 – Compactron Quadrature detector pentode + power pentode, used as FM audio demodulator and power stage; 6J10/6Z10, 10Z10 with a 13.2 V heater
- 38HE7, 38HK7 – Compactron High-perveance horizontal deflection output booster/damper/efficiency diode + beam power pentode
- 42KN6 – Compactron Horizontal deflection beam power pentode; 6KN6 with a 42 V heater
More of these tubes are listed as equivalents under M-P L - 450 mA heater
600 mA series heater tubes
Most are series heater versions of respective 6-prefix tubes; used in color TV receivers with series heater strings
- 2AF4 – UHF Medium-μ oscillator triode; 6AF4/EC94 with a 2.35 V heater
- 2BN4 – VHF triode
- 2CY5 – VHF sharp-cutoff tetrode
- 2EA5 – VHF sharp-cutoff tetrode
- 2EG4 – Nuvistor High-μ VHF triode, 1.7 volt heater
- 2ER5/XC95 – Vari-μ VHF triode; 4ER5/PC95 or 6ER5/EC95 with a 2.3 V heater
- 2ES5 – VHF triode
- 2EV5 – VHF sharp-cutoff tetrode
- 2FH5 – VHF triode
- 2FQ5 – VHF semiremote-cutoff triode
- 2FV6 – VHF sharp-cutoff tetrode
- 2FY5/XC97 – Frame-grid VHF triode; 4FY5/PC97 or 6FY5/EC97 with a 2.4 V heater
- 5J6 – Dual VHF triode; 6J6/ECC91 with a 4.7 V/600 mA controlled warm-up heater[79]
- 5T8 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war AM/FM radios; 6T8, 6AK8/EABC80, 9AK8/PABC80, 19T8/HABC80 or 27AK8/UABC80 with a 4.7 V heater
- 10DE7 – Dual dissimilar triode for use as vertical deflection oscillator and amplifier; 6DE7 or 13DE7 with a 9.7 V heater
- 30KD6 – Compactron Horizontal deflection beam power pentode; 6KD6 or 36KD6/40KD6 with a 30 V heater
More of these tubes are listed as equivalents under M-P X - 600 mA heater
Other tubes
- 13CW4 – Nuvistor High-μ VHF triode for use as a low-noise front end in standalone, semi-transistorized antenna boosters; 13.5 V/60 mA heater version of the 6CW4, later also used as a preamplifier in Neumann condenser microphones U-47 and U-48 after the production of the VF14M ceased[80]
- 20EZ7 – Dual high-μ AF triode, center-tapped 20 V/100 mA (series) resp. 10 V/200 mA (parallel) heater, Noval base; cf. 407A
- 26A6 – Remote-cutoff pentode with a 12-cell lead-acid battery heater
- 26A7GT – Dual low (26.5-50 V) anode voltage AF beam power pentode designed for both heater and anode to run directly off the standard avionics 28-volts DC bus, for use as a push–pull audio amplifier; cf. 13П1С, Shuguang 13P1P
- 26BK6, 26C6 – Dual diode + triode with a 12-cell lead-acid battery heater
- 26D6 – Heptode pentagrid with a 12-cell lead-acid battery heater
- 26E6WG – Avionics AF beam power pentode
- 26Z5W – Avionics dual 1.375 kV, 300 mA rectifier with separate cathodes for use as a voltage doubler
- 28D7W – Dual low (28-100 V) anode voltage AF beam power pentode designed for both heater and anode to run directly off the standard avionics 28-volts DC bus, shock resistant up to 350 g, for use 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
- 40A1, 50A1 – Barretters for use as cathode resistors of horizontal-deflection output tubes in early TV receivers to stabilize the picture width against mains voltage fluctuations
List of RMA professional tubes
Typecode explained above
- 1B23 – 20 kW, 400 to 1500 MHz Gas-filled, cold-cathode Transmit/Receive Tube (TR cell)
- 1B25 – 160 V Cold-cathode surge protector
- 1B41 – Gas-filled, cold-cathode 9.5 kV, 450 A spark gap
- 1B45 – Gas-filled, cold-cathode 14 kV, 450 A spark gap
- 1B46 (79...85 V), 1B47 (75...90 V), 1B64 (70 V) – 1...2 mA Voltage-regulator tubes, dual-contact bayonet candelabra mount
- 1B49 – Gas-filled, cold-cathode 12 kV, 450 A spark gap
- 1B59 – Cold-cathode Glow modulator tube, modulation up to 15 kHz, 2-pin Octal base
- 1C21 – Gas-filled, 25 mAavg, 100 mApeak, triode thyratron
- 1D21 – Strobotron Gas-filled, 50 mAavg, 5 Apeak, luminescent tetrode thyratron for use as a stroboscope lamp
- 1N23 – Silicon point contact diode used in early radar mixers
- 1N34 – Germanium point contact diode, still in production[81]
- 1P21 – 9-stage photomultiplier, spectral S4 response, 11-pin base
- 1P25 – Infrared image converter used in World War II night vision "sniperscopes"
- 1P29 – Gas-filled phototube, spectral S3 response, 4-pin base
- 1P39 – Vacuum phototube, spectral S4 response, 4-pin base
- 1S22 – 10 kV, 20 A Vacuum SPDT switch
- 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), Octal base[82]
- 2C21 – Separate cathodes dual RF triode, indirectly heated, low loss mica-filled phenolic resin ("Micanol")[13] 7-pin base, one grid on top cap
- 2C22 – Triode, indirectly heated, Octal base, grid and anode on separate top caps
- 2C36 – Rocket-type disk-seal UHF triode with an internal feedback circuit between cathode and anode, for use as UHF oscillator up to 1.75 GHz
- 2C37 – Rocket triode for use as SHF oscillator up to 3.3 GHz
- 2C39A – Oil can-type disk-seal UHF power triode with glass spacers up to 3 GHz, Panode = 100 W
- 2C39B – 2C39A with ceramic spacers
- 2C40 – Lighthouse-type disk-seal UHF power triode for continuous operation, Panode = 6.5 W at 3370 MHz
- 2C41 – Oil can UHF power triode for pulsed operation, 2200 Wpeak at 3 GHz
- 2C42 – Lighthouse UHF power triode for pulsed operation, 1750 Wpeak at 1050 MHz; improved 446
- 2C43 – Lighthouse UHF power triode, indirectly heated, up to 3.37 GHz, 6-pin base
- 2C46 – Lighthouse UHF power triode
- 2C50 – Separate cathodes dual triode, indirectly heated, Octal base, for use in servo amplifiers
- 2C51 – Separate cathodes dual shielded VHF triode, indirectly heated, Noval base
- 2C52 – Separate cathodes dual triode, indirectly heated, Octal base
- 2C53 – Indirectly heated, 8 kV triode, Octal base with anode on top cap
- 2D21/EN91 (CV797, Philips PL21, PL2D21) – 100 mAavg, 500 mApeak, 10 Asurge, Gas-filled, indirectly heated tetrode thyratron, negative starter voltage, Miniature 7-pin base, for relay and grid-controlled rectifier service, used in jukeboxes and computer equipment
- 2E22 – 53 W Power pentode, 5-pin base with anode on top cap
- 2E26 – Popular amateur 5.3 W VHF beam power tetrode up to 175 MHz, Octal base
- 2E30 – 10 W Directly heated beam power tetrode with deflection screens available on separate pin, Miniature 7-pin base
- 2E31 – Subminiature, directly heated, fully shielded sharp-cutoff RF/IF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 2E32 – Similar to 2E31, all-glass elliptical cross-section envelope with 5 short inline wire-ends
- 2E35 – 6 mW Subminiature directly heated power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 2E36 – Similar to 2E35, all-glass elliptical cross-section envelope with 5 short inline wire-ends
- 2E41 – Diode + pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 2E42 – Similar to 2E41, all-glass elliptical cross-section envelope with 5 short inline wire-ends
- 2F21 – Indirectly heated hexode monoscope, Indian Head test pattern, 6-pin base with dual top caps for #4 grid and anode
- 2G21 – Directly heated triode/heptode mixer, all-glass elliptical cross-section envelope with 7 short inline wire-ends
- 2G41 – Triode/heptode mixer, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 2G42 – Similar to type 2G41, all-glass elliptical cross-section envelope with 5 short inline wire-ends
- 2H21 – Phasitron, a magnetically controlled beam deflection phase modulator tube[83] similar to the 5593, used in early FM broadcast transmitters[84][85][86]
- 2J30 to 2J34 – 300 kW S-band Magnetrons
- 2J55 and 2J56 – 40 kW X-band Magnetrons for use as pulsed oscillator[87]
- 2K25 – 25 mW 8.5 to 9.66 GHz Reflex Klystron
- 2K50 – 15 mW 23.5 to 24.5 GHz Reflex Klystron
- 2P23 – Early Image Orthicon video camera tube
- 3B28 – 10 kV, 250 µAavg, 1 mApeak Xenon half-wave rectifier; ruggedized replacement for mercury-vapor type 866
- 3C22 – Disk-seal UHF power triode, Panode = 125 W with forced-air cooling, 1.4 GHz
- 3C23 – 1.5 Aavg, 6 Apeak, Mercury-vapor triode thyratron, 4-pin base with anode on top cap
- 3C33 – Common cathode dual power triode for use in burst- or phase-fired controllers, Septar 7-pin base
- 3C45 = 6130 – 45 mAavg, 1.5 ARMS, 35 Apeak, Half-indirectly heated hydrogen triode thyratron, 4-pin base with anode on top cap
- 3D21 – Indirectly heated beam power tetrode, Octal base with anode on top cap
- 3D22 – Gas-filled, 800 mAavg, 8 Apeak, tetrode thyratron, 7-pin base
- 3E29 – Dual beam power tetrode used in radar equipment, Septar 7-pin base with dual anode top cap; a pulse rated variant of the earlier 829B
- 4B32 – 10 kV, 1.25 Aavg, 5 Apeak Xenon half-wave rectifier
- 4D21 (6155, Eimac 4-125A) – 125 W Glass VHF beam power tetrode
- 4E27 – 125 W Glass radial-beam power pentode
- 4J31 to 4J35 – 1 MW S-band Magnetrons
- 4J42 – 40 kW Magnetron, 660 to 730 MHz[88]: 287ff
- 5B24 – Full-wave, mercury-vapor Tungar bulb, a low-voltage rectifier for charging 60-cell lead-acid batteries at 6 A, 2.5 V/24 A heater[89]
- 5C22 – Half-indirectly heated, hydrogen triode thyratron for use in radar modulators
- 5D22 (6156, Eimac 4-250A) – 250 W, 110 MHz Glass beam power tetrode
- 5J26 – 500 kW, 1.22 to 1.35 GHz S-band Magnetrons
- 6C21 – Power triode for use in hard tube pulser radar modulators
- 7C23 – 120 kW Power triode for high voltage pulse operation
- 8D21 – Internally water-cooled dual power tetrode used in early VHF TV transmitters
- 9C21 – 100 kW Water-cooled power triode, directly heated, 4-pin base with dual top caps for grid and anode
List of EIA professional tubes
Most of these are special quality versions of the equivalents given. Some manufacturers preceded the EIA number with a manufacturer's code, as explained above
5000s
- 5331, 5332, 5514 – Directly heated power triodes, 4-pin base with anode on top cap
- 5556 – Directly heated power triode, 4-pin base
- 5593 – Phasitron, a magnetically controlled beam deflection phase modulator tube[90] similar to the 2H21, used in early FM broadcast transmitters[84][85][86]
- 5608 – Dual power triode, designed for use with AC anode voltage and critical grid leak requirements
- 5651 – 86-volts, cold-cathode, glow-discharge voltage-regulator tube, Miniature 7-pin base
- 5654/E95F, CV4010, 408A – VHF/RF/IF Sharp-cutoff pentode, Miniature 7-pin base, common in vintage radar IF amplifiers; premium version of 6AK5/EF95/6Ж1П (↦6J1P)
- 5678/DF60 – Subminiature, directly heated, shielded RF pentode with a split suppressor grid, its halves tied to the positive resp. negative filament end, all-glass elliptical cross-section envelope with 5 long inline wire-ends
- 5691 – Special Red ruggedized long-life dual high-μ triode; industrial version of the 6SL7GT
- 5692 – Special Red ruggedized long-life dual medium-μ triode; industrial version of the 6SN7GT
- 5693 – Special Red ruggedized long-life sharp-cutoff pentode; industrial version of the 6SJ7
- 5704 – Subminiature diode, all-glass round cross-section envelope, but 4 long inline wire-ends
- 5727 – 650 V, 100 mAavg, 500 mApeak, 10 Asurge Indirectly heated tetrode thyratron, positive starter voltage, Miniature 7-pin base
- 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;[91] cf. 5738, 6090, 6091, 6170, 6324
- 5731 – Narrow-tolerance selected 955 Acorn triode for use in Radiosonde weather balloon transmitters
- 5734 – 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[92][93]
- 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;[94] cf. 5729, 6090, 6091, 6170, 6324
- 5749 – RF pentode; premium version of 6BA6/EF93, M-OV/GEC W727
- 5750 – Heptode pentagrid converter; premium version of 6BE6/EK90, M-OV/GEC X727
- 5751 – Low-voltage, low-noise avionics dual triode with separate cathodes
- 5814A – Dual triode, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant; industrial/computer-rated version of 12AU7/ECC82
- 5836, 6BL6 – Sutton tube, a Reflex Klystron used as a 250 mW CW microwave source, 1.6 to 6.5 GHz depending upon an external cavity. 4-pin peewee base with cavity contact rings and top cap
- 5837, 6BM6 – Sutton tube used as a 150 mW CW microwave source, 550 MHz to 3.8 GHz depending upon an external cavity. 4-pin peewee base with cavity contact rings and top cap
- 5845 – Directly heated, dual 300 V, 1 mA thermally-limited (=saturated) emission diode, center-tapped 5 V/435 mAmax uncoated tungsten filament, usable 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; cf. Tesla RA0007, YA1000
- 5876A – Glass pencil-type disk-seal UHF power triode up to 2 GHz
- 5930 – Ruggedized, directly heated power triode, 4-pin base
- 5962 – 700 V/2...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) – Dual triode, high zero-bias anode current, no cathode poisoning after prolonged periods in cut-off; industrial/computer-rated versions of 12AV7
- 5998, 6336A, 6394, 6520, 6528, 7802 – Dual power triodes, designed for series voltage regulator applications
6000s
- 6021/ECC70, 6112, 6690, 6832 – Subminiature, separate cathodes dual triode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- 6042 (25 V/150 mA heater), 6180 (6.3 V/600 mA heater) – Separate cathodes dual triodes, Octal base; derived from the 6SN7
- 6047 – Additron, a triple-control grid, split-anode tetrode for use as a single-bit digital full adder[95] (technically a hexode)
- 6057, M8137 – Dual high-μ triode; premium version of 12AX7/ECC83, M-OV/GEC B339
- 6059 – Low-microphonics pentode; premium version of 6BR7, 6J7
- 6060, M8162 – Dual high-μ triode; premium version of 12AT7/ECC81, M-OV/GEC B309
- 6064, M8083 – Sharp-cutoff RF pentode; premium version of 6AM6/EF91 = M-OV/GEC Z77
- 6067, M8136 – Dual medium-μ triode; premium version of 12AU7/ECC82, M-OV/GEC B329
- 6080 – Very-low impedance dual power triode, designed for series voltage regulator applications, now popular for output transformerless audio amplifiers; premium version of 6AS7G/ECC230
- 6082 – Ruggedized, indirectly heated power triode, Octal base
- 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;[96] 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;[97] cf. 5729, 5738, 6090, 6170, 6324
- 6146 – 60 MHz, 120 W AF/RF/VHF beam power pentode
- 6146B, 8298A – Improved version of 6146, 6146A and 8298
- 6170 and 6324 – 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;[98] cf. 5729, 5738, 6090, 6091
- 6173 – Pencil-type disk-seal UHF diode up to 3.3 GHz
- 6196 – Directly heated dual, compensating electrometer tetrode with space charge grids for use in the 2 branches of a differential-in, differential-out bridge circuit[99]
- 6218/E80T (CV5724) – Modulated, single-anode beam deflection tube for pulse generation up to 375 MHz, shock resistant up to 500 g[100][101][102][103]
- 6263 – Pencil-type disk-seal UHF power triode up to 500 MHz, Panode = 8 W
- 6351 – Secondary emission pentode for wideband RF amplifiers
- 6353 – 19.3 kV/25...1000 µA Corona voltage-regulator tube, Miniature 7-pin base with anode on top cap
- 6361 – Convectron, an inclinometer tube that senses tilt from the vertical by means of different gas convections around a 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
- 6386 – Dual vari-μ triode for use as VHF cascode amplifiers or in audio compressors
- 6391 – Subminiature low-microphonics pentode, 8-pin all-glass wire-ended
- 6441 – 650 V, 100 mAavg, 300 mAsurge Tacitron, 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;[104] cf. EC860, 20TC4, 30TC1
- 6462 – Magnetic pickup tube, a 1-axis beam deflection magnetometer 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[105]
- 6498 – Memotron, a storage tube[106]
- 6499 – Radechon, an early form of digital computer memory[107]
- 6533 – Subminiature low-microphonics triode, 8-pin all-glass wire-ended
- 6550 – 20 W AF beam power tetrode with a 35 watt anode, for high fidelity amplifiers
- 6550A – Improved 6550 with a 42 watt anode
- 6571 – Williams-type computer memory tube[108]
- 6577 – Typotron, a charactron for text mode video rendering in early computer monitors[109]
- 6694, 6957, 7412, 7536, 7633/ORP11, 8100, 8142, 8143, 8217, 8318, 8345, 8346, 8347, 8474, 8475, 8476, 8477, 8478, 8582 – CdS photoresistors (LDR)
- 6700 – 200 ns Decade counter Magnetron Beam Switching Tube, 6.3 V/300 mA heater[110]
- 6701 – Low-voltage 500 ns decade counter Magnetron Beam Switching Tube, 6.3 V/300 mA heater[111]
- 6702 (200 to 400 MHz), 6713 (0.15 to 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
- 6703 – 500 ns Decade counter Magnetron Beam Switching Tube, 6.3 V/300 mA heater
- 6704 – 100 ns Decade counter Magnetron Beam Switching Tube with internal spade load resistors, 6.3 V/300 mA heater
- 6710, 6711, 6712 (High current), 6714 (Low-voltage) – 2 MHz Decade counter Beam-X Switch, 6.3 V heater
- 6762 – Wamoscope ("Wave modulated oscilloscope"), a TWT/CRT combination used to directly visualize an incoming microwave signal by electron velocity-sorting[112]
- 6835, 7570, 7571 – Single-electron gun recording storage tube, an analog video frame 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[113][114][115]
- 6846 – Gas-filled, three-cathode, glow-transfer 1-bit binary counter or switching tube, Miniature 7-pin base[116]
- 6877, 7233 – Power triodes, designed for series voltage regulator applications
- 6900 – Dual power triode for pulse applications in missiles, avionics and industrial systems, Noval base
- 6922/E88CC – Dual triode used as RF cascode amplifier; industrial version of 6DJ8/ECC88
- 6973 (6CZ5) – Beam power pentode popular in some makes of 1960s era guitar amplifiers, though rarely implemented in modern times
7000s
- 7025 – Low-hum and noise version of 12AX7
- 7025A – Low-microphonics version of 7025
- 7027 – AF power pentode, improved 6L6 with a 25 watt anode and different pinout
- 7027A – Improved 7027 with a 35 watt anode
- 7034 = QEL1/150 = Eimac 4X150A – Forced-air cooled 150 W beam power tetrode
- 7077 – Miniature ceramic/metal disk-seal planar UHF triode
- 7105 – 6080 with a 12.6 volts heater
- 7189/6BQ5/EL84 – AF power pentode
- 7189A – Improved 7189
- 7199 – AF triode + AF pentode, Noval base; similar to 6U8
- 7229,[117] 7230,[118] 7231,[119] 7232,[120] 7439, 7440, 7441, 7595, 7596, 7597, 7598, 7599, 7600, 7602 – Krytrons, cold-cathode gas-filled trigger tubes with a primer electrode for use as a very high-speed, high-surge current switch[121] – second source to EG&G
- 7236 – Dual power triode for use as long-life power amplifier in computer applications
- 7241, 7242 – Triple-grid/cathode power triodes, designed for hi-rel series voltage regulator applications
- 7266 – Miniature ceramic/metal disk-seal planar UHF diode
- 7289 – 3 GHz, 40 W UHF planar power triode
- 7296 – Miniature ceramic/metal disk-seal planar VHF triode for use on PCBs
- 7308/E188CC – Premium version of 6922
- 7323, 7400 (top-viewing), 7401, 7979 – Small neon-filled cold-cathode thyratrons for use as a latching indicator, all-glass wire-ended; cf. 395A, МТХ-90
- 7360 – Beam deflection tube, used as balanced modulator/mixer up to 100 MHz[122][123][124]
- 7414 – 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[125]
- 7416 – Constant firing diode, a gas-filled cold-cathode switching diode with a very stable breakdown voltage over age and temperature, for use as a trigger in RC timing crcuits, Miniature 7-pin base
- 7430 – Flat-envelope variant of the 6AK5/EF95 sharp-cutoff pentode for use on PCBs in Radiosonde weather balloon transmitters
- 7462 – Miniature ceramic/metal disk-seal planar UHF triode; PCB variant of 7077
- 7486 – Miniature ceramic/metal disk-seal planar UHF triode
- 7548 – Secondary emission hexode for pulse generator and pulse amplifier applications
- 7551 (12-15V heater for mobile equipment), 7558 (6.3V heater for fixed equipment) – 175 MHz, 10 W Noval-base beam power pentode used for telephony, RF amplification, and more rarely AF amplification
- 7554 – Ceramic/metal Pencil-type disk-seal SHF power triode up to 5 GHz
- 7572, 7575, 7702 – Dual-electron gun recording storage tube, a realtime analog video frame 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[126][127][128]
- 7586 – First Nuvistor available on the market, medium-μ triode, 6.3 V/140 mA heater
- 7587 = 6Э12Н↦6E12N – Nuvistor Sharp-cutoff tetrode, 6.3 V/150 mA heater
- 7588 – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs
- 7591 – 19 W Beam power pentode found in many guitar amps made by Gibson and Ampeg; 6GM5 or 7868 with a 7-pin Octal base
- 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;[129] cf. XQ1200, XQ1340, ЭПЛ-1
- 7625 – Miniature ceramic/metal disk-seal planar AF triode for use on PCBs
- 7688, 7690 (Medium-μ), 7689 (high-μ) – Triple triodes
- 7699 – Dual tetrode for wideband push-pull amplifiers
- 7720 – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs
- 7733 – CRT cathode drive power pentode; premium version of 12BY7/EL180
- 7762 – Shock-proof avionics AF beam power pentode
- 7763 – Beam deflection tube, used as IF amplifier/limiter where a constant phase shift over a wide range of input signal amplitudes is required[130]
- 7768 – Miniature ceramic/metal disk-seal planar SHF triode up to 4 GHz
- 7846 – CdSe infrared (500...900 nm) photoresistor, all-glass with 2 wire-ends
- 7868 – 19 W Beam power pentode found in many of the once popular Challenger series PA amps made by Bogen Communications, also found in some guitar amplifiers made by Ampeg; 6GM5 or 7591 with a B9E Novar base
- 7895 – Improved 7586 Nuvistor with higher Gain (amplification factor) μ
8000s
- 8011 – Micropup-type UHF power triode up to 600 MHz
- 8032A (6883B, 8552 – 13.5V heater), 8298A (6146B – 6.3V heater) – 60 MHz, 120 W AF/RF/VHF beam power pentode
- 8056 – Low (12-50 V) anode voltage Nuvistor triode, 6.3 V/135 mA heater
- 8058 – Nuvistor triode with grid on envelope and an anode cap, for grounded-grid UHF circuits
- 8069 – 8 kV/23...1000 µA Corona voltage-regulator tube, cathode cylinder with anode on top cap
- 8081 – Miniature ceramic/metal disk-seal planar AF triode for use on PCBs
- 8082 – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs
- 8083 – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs
- 8089 – 1.6 kV/20...800 µA Corona voltage-regulator tube, all-glass with 2 wire-ends
- 8090 – 3.5 kV/50...1000 µA Corona voltage-regulator tube, Noval with anode on top cap
- 8091 – 4 kV/50...1000 µA Corona voltage-regulator tube, Noval with anode on top cap
- 8122 – Forced-air cooled, 300 W@470 MHz beam power tetrode
- 8203 – Nuvistor power triode up to 250 MHz
- 8256 – 3.5 kV/35...1900 µA Corona voltage-regulator tube, all-glass with 2 wire-ends
- 8257 – 1.2 kV/15...750 µA Corona voltage-regulator tube, all-glass with 2 wire-ends
- 8380 – Nuvistor power tetrode for use in sonobuoys, up to 80 MHz
- 8382 – Nuvistor power triode for use in sonobuoys, up to 175 MHz
- 8393 – Nuvistor medium-μ triode, used in Tektronix oscilloscopes; 7586 with a 13.5 V/60 mA heater
- 8414 – Low (26.5 V) anode voltage, sharp-cutoff, VHF/RF/IF, frame-grid pentode designed for both heater and 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. 28D7W
- 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
- 8441 – Nuvistor high-μ triode for use in sonobuoys
- 8456 – Nuvistor medium-μ triode for use in sonobuoys
- 8461 – 80 kV, 200 kW Water-cooled power triode with three 15 V/200 A (each) filaments for 3-phase operation in series regulator, or hard-tube modulator applications, considerable X-radiation
- 8469 – 400 V/5...400 µA Corona voltage-regulator tube, all-glass with 2 wire-ends
- 8506 – Miniature ceramic/metal disk-seal planar UHF triode
- 8514 – 1 kV/10...800 µA Corona voltage-regulator tube, 7-pin with anode on top cap
- 8515 – 1.6 kV/20...950 µA Corona voltage-regulator tube, 7-pin with anode on top cap
- 8525, 8526, 8527 – Nuvistor dual medium-μ triode
- 8549 – 70 kV, 500 kW Water-cooled power triode with a 7.6 V/1.9 kA filament, considerable X-radiation, can deliver 10-ms pulses of 60 MW at 6% duty factor
- 8569 (ИВ-29↦IV-29) – Vacuum fluorescent display, single pixel, top-view, for use as flip-flop status indicator in transistorized computers. All-glass wire-ended, 700 mV/35 mA filament; cf. 6977/DM160
- 8627 – Nuvistor power triode up to 1.2 GHz
- 8628 – Nuvistor high-μ AF triode for use in valve microphones and piezoelectric pickup preamplifiers up to 200 kHz
- 8808 – Nuvistor high-μ triode up to 1.2 GHz
- 8873 – 500 MHz, 200 W anode dissipation power triode
- 8874 – 500 MHz, 400 W anode dissipation power triode
- 8875 – 500 MHz, 300 W anode dissipation power triode
- 8877 = Eimac 3CX1500A7 – Ceramic, forced-air cooled, 1.5 kW power triode
- 8974 (Eimac X-2159) – 30 MHz, 1.5 MW Water-cooled tetrode used for very high-power broadcast and industrial service, two-section 18.5 V/650 A (each) filament
List of European Mullard–Philips tubes
Note: Typecode explained above. The part behind a slash ("/") is the RETMA/RMA/EIA equivalent.
A - 4 V heater
AAB
- AAB1 – Triple diode with common cathode, side-contact 8 base; EAB1 or PAB1 with a different heater
AB
- AB1 – Dual common cathode signal diode, 650 mA heater, European 5-pin base with one anode on top cap
- AB2 – AB1 with a side-contact 5 base; CB2 with a different heater
ABC
- ABC1 – Dual diode + triode, side-contact 8 base with triode grid on top cap; CBC1 with a 4 V/650 mA heater
ABF
- ABF1 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, side-contact 8 base with control grid on top cap
ABL
- ABL1 – Dual diode + 9-watts power pentode, side-contact 8 base with control grid on top cap; EBL1 with a 4 V/2.4 A heater
AC
- AC2 – Triode for use 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 – 3 mAavg, 300 mApeak, Argon-filled triode thyratron, 4 V/600 mA heater, side-contact 8 base with grid on top cap, for relaxation oscillators up to 50 kHz
- AC100 – Triode for use as AF amplifier or as oscillator together with an AH100 mixer; AC2 with a P5A German PTT 5-pin base
- AC101 – Triode for use as AF amplifier or as oscillator together with an AH100 mixer; AC2 with an O5A European 5-pin base
- AC102 – Triode, P7A German PTT 7-pin base with 2 unused pins
- AC104 – Triode, O5A European 5-pin base[131]
- AC701 – Subminiature AF triode, all-glass with 4 wire-ends with grid on top wire, for condenser microphone preamplifiers
- AC761 – Subminiature AF triode, all-glass with 4 wire-ends with grid on top wire, for microphone preamplifiers
ACH
- ACH1 – Triode/remote-cutoff hexode mixer, European 7-pin base with hexode control #1 grid on top cap; BCH1 with a 4 V/1 A heater
A D
- AD1 – Directly heated, 4.2 W power triode, side-contact 8 base, 4 V/950 mA filament
- AD1N – AD1 with a half-indirect 4 V/2 A heater
- AD100 – 1.7 W Power triode, P7A German PTT 7-pin base with 2 unused pins
- AD101 – 1.7 W Power triode, O5A European 5-pin base
- AD102 – 5.5 W Power triode, P7A German PTT 7-pin base with 2 unused pins
AF
- AF2 – Remote-cutoff pentode, 4 V/1.1 A heater, European 5-pin base with anode on top cap
- AF3 – Remote-cutoff pentode, side-contact 8 base with control grid on top cap; CF3 with a 4 V/650 mA heater
- AF7 – Sharp-cutoff pentode, side-contact 8 base with control grid on top cap; CF7, EF7 or VF7 with a 4 V/650 mA heater
- AF100 – Wideband, sharp-cutoff pentode
AH
- AH1 – Remote-cutoff hexode for use as mixer or RF gain control, side-contact 8 base with #1 grid on top cap; CH1 with a 4 V/650 mA heater
- AH100 – Remote-cutoff hexode for use as mixer or RF gain control, side-contact 8 base
AK
- AK1 – Remote-cutoff octode pentagrid converter, European 7-pin base with #4 grid on top cap, 4 V/650 mA heater
- AK2 – Remote-cutoff octode pentagrid converter, side-contact 8 base with #4 grid on top cap; CK1 with a 4 V/650 mA heater, similar to EK2
AL
- AL1 – 3.1 W AF power pentode, side-contact 8 base, 4 V/1.1 A heater
- AL2 – 3.8 W AF power pentode, side-contact 8 base with control grid on top cap, 4 V/1 A heater
- AL3 – AF power pentode, side-contact 8 base
- AL4 – AF power pentode, side-contact 8 base; EL3(N) with a 4 V/1.75 A heater
- AL5 – AF power pentode, side-contact 8 base; EL5 with a 4 V/2 A heater
- AL60 – Power pentode, M7A British 7-pin base with anode on top cap[132]
- AL860 – Directly heated, 3 W RF/AF power pentode, center-tapped 4.8 V/280 mA (series) resp. 2.4 V/560 mA (parallel) filament, Noval base
AM
- AM1 = Philips 4677 – Top-view, "Magic Cross"-type tuning indicator, side-contact 8 base; EM1 with a 4 V/300 mA heater
- AM2 (Philips 4697) – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 base; CM2 or EM2 with a different heater
AN
- AN1 = M-OV/GEC GT1C – -1300 to +650 Va, 300 mAavg, 2 Apeak, 15 Asurge, Gas-filled triode thyratron with negative control characteristic, 4 V/1.45 A heater, O5A European 5-pin base, for industrial control applications
AX
- AX1 = Philips 4652 – 500 VPIV, 125 mA Gas-filled, full-wave rectifier, European 4-pin base
- AX50 – 500 VPIV, 275 mA Gas-filled, full-wave rectifier, European 4-pin base
AZ
- AZ1 – 1.4 kV, 2×30 mA Full-wave rectifier, side-contact 8 base
- AZ2 – 1.4 kV, 2×80 mA Full-wave rectifier; Philips 1561 with a side-contact 8 base
- AZ3 – 1 kV, 2×60 mA Full-wave rectifier, side-contact 8 base
- AZ4 – 1.4 kV, 2×100 mA Full-wave rectifier, side-contact 8 base
- AZ11 – Full-wave rectifier, AZ1 with Y8A steel tube base
- AZ12 – Full-wave rectifier, AZ4 with Y8A steel tube base
- AZ21 – 120 mA Full-wave rectifier, B8G Loctal base
- AZ31 – Full-wave rectifier, AZ1 with 5-pin Octal base
- AZ32 – Full-wave rectifier, AZ2 with 5-pin Octal base
- AZ33 – 120 mA Full-wave rectifier, 4-pin Octal base
- AZ41 – 1.4 kV, 2×30 mA Full-wave rectifier, Rimlock base
- AZ50 – 1.4 kV, 2×125 mA Full-wave rectifier, European 4-pin base
B - 180 mA heater
BB
- BB1 – Shielded common cathode dual diode, CB2 with a 16 V heater and a European 5-pin base with one anode on top cap[133][134][135]
BCH
- BCH1 – Triode/remote-cutoff hexode mixer; ACH1 with a 24 V heater[134][135]
BL
- BL2 – Power pentode, CL2 with a 30 V heater and a European 5-pin base with the control grid on top cap[134][135]
C - 200 mA heater
Many "C" tubes had 13V/200mA heaters, so apart from 1930s European AC/DC radios, these were also used in 12-Volts car radios[3]: 6
C<none>
Barretters with a side-contact 8 base; the six free pins were used as jumpers to switch the anode supply circuit between 110V and 220V mains
- C1 – 80 to 200 V filament for 220V mains
- C2 – 35 to 100 V filament for 110V mains
- C3 – 100 to 200 V filament with a surge-limiting Urdox (UO2) power thermistor
- C4 – 55 to 105 V filament with an Urdox power thermistor
- C6 – 75 to 150 V filament with an Urdox power thermistor
- C8 – 80 to 200 V filament
- C9 – 35 to 100 V filament
- C10 – 35 to 100 V filament
- C12 – Both 35 to 100 V or 80 to 200 V center-tapped filament
CB
- CB1 – Common cathode dual diode, side-contact 5 base, 13 V heater
- CB2 – Common cathode dual diode, side-contact 5 base; AB2 with a 13 V heater
CBC
- CBC1 – Common cathode dual diode + triode, side-contact 8 base with triode grid on top cap; ABC1 with a 13 V heater
CBL
- CBL1 – Common cathode dual diode + power pentode, side-contact 8 base with control grid on top cap, 44 V heater
- CBL6 – Common cathode dual diode + power pentode, side-contact 8 base with control grid on top cap, 44 V heater
- CBL31 – Common cathode dual diode + power pentode; CBL1 with an Octal base
CC
- CC2 – Triode for use 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 heater
CCH
- CCH1 – Triode/remote-cutoff hexode mixer, side-contact 8 base with hexode control #1 grid on top cap, 20 V heater
- CCH2 – Triode/remote-cutoff hexode mixer, side-contact 8 base with hexode control #1 grid on top cap, 29 V heater
- CCH35 – Triode/remote-cutoff hexode mixer; ECH3 with an Octal base and a 7 V heater
CF
- CF1 – Sharp-cutoff pentode, side-contact 8 base with control grid on top cap, 13 V heater
- CF2 – Remote-cutoff pentode, side-contact 8 base with control grid on top cap, 13 V heater
- CF3 – Remote-cutoff pentode, side-contact 8 base with control grid on top cap; AF3 with a 13 V heater
- CF7 – Sharp-cutoff pentode, side-contact 8 base with control grid on top cap; AF7, EF7 or VF7 with a 13 V heater
- CF50 – Microphone preamplifier sharp-cutoff pentode, side-contact 8 base with control grid on top cap, 30 V heater
- CF51 – Microphone preamplifier sharp-cutoff pentode, side-contact 8 base with control grid on top cap
CH
- CH1 – Remote-cutoff hexode mixer, side-contact 8 base with #1 grid on top cap; AH1 with a 13 V heater
CK
- CK1 – Remote-cutoff octode pentagrid converter, side-contact 8 base; AK2 with a 13 V heater
- CK3 – Remote-cutoff beam octode pentagrid converter, side-contact 8 base; EK3 with a 19 V heater
CL
- CL1 – 5 Watts power pentode for anode voltages above 200 V, side-contact 8 base with control grid on top cap, 13 V heater
- CL2 – 8 Watts power pentode for anode voltages below 200 V; BL2 with a 24 V heater and a side-contact 8 base with control grid on top cap
- CL4 – 9 Watts power pentode, side-contact 8 base with control grid on top cap, 33 V heater
- CL6 – 5 Watts power pentode, side-contact 8 base with control grid on top cap, 35 V heater
- CL33 – AF power pentode, CL4 with an Octal base
CM
- CM2 – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 base; AM2 with a 6.3 V/200 mA heater, therefore marketed as C/EM2
CY
- CY1 – 250 V, 80 mA Half-wave rectifier, side-contact 8 base, 20 V heater
- CY2 – Dual[136] 250 V, 60 mA rectifier with separate cathodes, side-contact 8 base, 30 V heater, for use as voltage doubler
- CY31 – CY1 with an Octal base
- CY32 – CY2 with an Octal base
D - 1.4 V filament/heater
Note: D-type tubes except some rectifiers are directly heated
DA
- DA50 – Subminiature diode, 3-pin all-glass
- DA90/1A3 – Indirectly heated FM discriminator diode, Miniature 7-pin base, 1.4 V/150 mA heater
- DA101 – Diode, Miniature 7-pin base
DAC
- DAC1 – AM detector diode + AF triode, side-contact 8 base with control grid on top cap, 1.4 V/50 mA filament[137]
- DAC21 – AM detector diode + AF triode, Octal base, 1.4 V/25 mA filament between nonstandard pins 1 and 8
- DAC22 – AM detector diode + AF triode, B8G Loctal base
- DAC25 – AM detector diode + AF triode, B8G Loctal base
- DAC31 – AM detector diode + AF triode, Octal base
- DAC32/1H5GT – AM detector diode + AF triode, Octal base, 1.4 V/50 mA filament
- DAC41w – AM detector diode + AF triode[33]
DAF
- DAF1 – AM detector diode + AF pentode[138]
- DAF11 – AM detector diode + AF pentode, wide-range 0.9-1.5 V/50 mA filament, Y8A steel tube base with 1 unused pin
- DAF26/1LD5 – AM detector diode + AF pentode, B8G Loctal base
- DAF40 – AM detector diode + remote-cutoff RF/IF pentode, Rimlock base, 1.4 V/25 mA filament
- DAF41 – AM detector diode + AF pentode, Rimlock base, 1.4 V/25 mA filament
- DAF70 – Subminiature AM detector diode + AF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, 1.25 V/25 mA filament
- DAF91/1S5 – AM detector diode + AF pentode, Miniature 7-pin base, 1.4 V/50 mA filament
- DAF92/1U5 – AM detector diode + AF pentode, Miniature 7-pin base
- DAF96/1AH5 – AM detector diode + AF pentode, Miniature 7-pin base, 1.4 V/25 mA filament
- DAF191 – AM detector diode + AF pentode, Miniature 7-pin base, 1.4 V/50 mA filament
- DAF961 – AM detector diode + AF pentode, Miniature 7-pin base, 1.2 V/60 mA filament
DAH
- 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 (series) resp. 1.4 V/50 mA (parallel) filament, Octal base with control grid on top cap; cf. 6FS5, 6GU5, EF8, EF38
DBC
- DBC21 – Dual diode + triode, Octal base, 1.4 V/50 mA filament between nonstandard pins 1 and 8
- DBC31 – Dual diode + triode, Octal base[139]
DC
- DC11 – AF driver triode for DDD11, wide-range 0.9-1.5 V/25 mA filament, Y8A steel tube base with 3 unused pins
- DC25 – AF driver triode, B8G Loctal base, for DDD25
- DC41w – Driver triode[33]
- DC51 – Directly heated miniature AF triode, 1.5 V/70 mA filament, B4B 4-pin subminiature base, for use in hearing aids;[140] cf. KC50, KC51, Mullard DB1
- DC70/6375 – Subminiature UHF triode for walkie-talkies, all-glass round cross-section envelope, circular 8-pin/wire-ends base, 1.25 V/200 mA filament
- DC80/1E3/5882 – Triode for use as VHF amplifier or self-oscillating mixer in FM receivers, Noval base
- DC90 – Triode for use as VHF amplifier or self-oscillating mixer, Miniature 7-pin base, 1.4 V/50 mA filament
- DC96 – Triode for use as VHF amplifier or self-oscillating mixer, Miniature 7-pin base, 1.4 V/25 mA filament[135]
- DC703 – Subminiature UHF triode, all-glass round cross-section envelope, circular 5-pin/wire-ends base
- DC760 – Subminiature electrometer inverted triode for probes, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- DC761 – Subminiature UHF triode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- DC762 – Subminiature electrometer inverted triode for probes, 100 fA grid current, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- D1C (957) – Acorn UHF triode
- D2C (958) – Acorn UHF triode
DCC
- DCC90/3A5 – Dual triode, RF amplifier or oscillator, center-tapped 2.8 V/110 mA (series) resp. 1.4 V/220 mA (parallel) filament, Miniature 7-pin base
DCF
- DCF60/1V6 – Subminiature oscillator/mixer triode/pentode, all-glass elliptical cross-section envelope with 7 long inline wire-ends, 1.25 V/40 mA filament
DCH
- DCH1 – Triode/hexode mixer, European 7-pin base[141]
- DCH11 – Triode/remote-cutoff hexode mixer, Y8A steel tube base, wide-range 0.9-1.5 V/75 mA filament
- DCH21 – Triode/remote-cutoff hexode mixer, Octal base, filament between nonstandard pins 1 and 8
- DCH22 – Triode/remote-cutoff hexode mixer, B8G Loctal base
- DCH25 – Triode/remote-cutoff hexode mixer, B8G Loctal base
- DCH31 – Triode/remote-cutoff hexode mixer, Octal base[142]
- DCH41w – Triode/remote-cutoff hexode mixer[33]
DD
- DD51 – Directly heated miniature AF power triode, 1.5 V/70 mA filament, B4B 4-pin subminiature base, for use in hearing aids; cf. KD50, Mullard DB3
- DD960 – VHF power triode, center-tapped 2.4 V/100 mA (series) resp. 1.2 V/200 mA (parallel) filament, Miniature 7-pin base
DDD
- DDD11 – Dual AF power triode, wide-range 0.9-1.5 V/100 mA filament, Y8A steel tube base with 1 unused pin – preferred driver is DC11
- DDD25 – Dual AF power triode, B8G Loctal base – preferred driver is DC25
- DDD41w – Dual power triode[33]
DF
- DF1 – RF/IF pentode, side-contact 8 base with control grid on top cap[143]
- DF11 – Remote-cutoff RF/IF pentode, wide-range 0.9-1.5 V/100 mA filament, Y8A steel tube base with 2 unused pins
- DF21 – Sharp-cutoff RF/IF/AF pentode, Octal base, 1.4 V/25 mA filament between nonstandard pins 1 and 8
- DF22 – Remote-cutoff RF/IF pentode, Octal base, 1.4 V/50 mA filament between nonstandard pins 1 and 8
- DF23 – Remote-cutoff RF/IF pentode, B8G Loctal base
- DF25 – Remote-cutoff RF/IF pentode, B8G Loctal base
- DF26 – Sharp-cutoff RF/IF pentode, B8G Loctal base
- DF31 – Sharp-cutoff RF/IF/AF pentode, Octal base[144]
- DF32 – Sharp-cutoff RF/IF/AF pentode, Octal base[144]
- DF33/1N5GT – Remote-cutoff RF/IF pentode, Octal base, 1.4 V/50 mA filament[144]
- DF41w – Remote-cutoff RF/IF pentode[33]
- DF51 – Miniature, 1.5 V/70 mA half-indirectly heated, sharp-cutoff RF/IF pentode, B4B 4-pin subminiature base with anode on top cap;[145] cf. 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, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/50 mA filament
- DF61 – Subminiature shielded sharp-cutoff RF or mixer pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/25 mA filament
- DF62/1AD4 – Subminiature shielded sharp-cutoff RF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/100 mA filament, for use as RF/IF stage
- DF63 – Subminiature shielded remote-cutoff RF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/25 mA filament, for use as RF/IF stage
- DF64 – Subminiature AF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 0.625 V/10 mA filament, for use in hearing aids
- DF65 – Subminiature AF pentode, all-glass round cross-section envelope, circular 5-pin/wire-ends base, 0.625 V/13.3 mA filament, for use in hearing aids
- DF66 – Subminiature AF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 0.625 V/15 mA filament, for use in hearing aids
- DF67/6008 – DF65 with round cross-section envelope, but 5 inline wire-ends
- DF70 – Subminiature AF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, 0.625 V/25 mA filament, for use in hearing aids
- DF72 – Subminiature sharp-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use as RF/IF stage
- DF73 – Subminiature remote-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use as RF/IF stage
- DF91/1T4 – Remote-cutoff RF/IF pentode, Miniature 7-pin base, 1.4 V/50 mA filament
- DF92/1L4 – Sharp-cutoff RF/IF pentode, Miniature 7-pin base, 1.4 V/50 mA filament
- DF96/1AJ4 – Remote-cutoff RF/IF pentode, Miniature 7-pin base, 1.4 V/25 mA filament
- DF97/1AN5 – Remote-cutoff RF/IF/mixer pentode with the suppressor grid on a separate pin, Miniature 7-pin base, 1.4 V/25 mA filament
- DF161 – Subminiature AF pentode, all-glass wire-ended, for use in hearing aids
- DF167 – Subminiature AF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 0.625 V/13.3 mA filament, for use in hearing aids
- DF191 – RF pentode, Miniature 7-pin base, 1.4 V/50 mA filament
- DF650 = Raytheon CK538DX – Subminiature AF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, for use in hearing aids[146]
- DF651 = Raytheon CK549DX – Subminiature AF pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, for use in hearing aids
- DF668 – Subminiature RF pentode, all-glass elliptical cross-section envelope with 5 inline wire-ends, 1.25 V/100 mA filament; similar to DF62/1AD4
- DF669 – Subminiature RF/IF pentode, all-glass elliptical cross-section envelope with 5 inline wire-ends, 1.25 V/50 mA filament; similar to DF60/5678
- DF703 (5886) – Subminiature electrometer pentode, envelope has a moisture-repellent coating, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/10 mA filament, for probe amplifiers
- DF904/1U4/5910 – Sharp-cutoff SW/VHF pentode, Miniature 7-pin base
- DF906 – Sharp-cutoff SW/VHF pentode, Miniature 7-pin base
- DF961 – Sharp-cutoff SW/VHF pentode, Miniature 7-pin base, 1.2 V/60 mA filament
- D1F – D11F with a hand grip
- D2F – D12F with a hand grip
- D3F (959) – Acorn VHF pentode
- D11F – Acorn remote-cutoff RF/IF/AF pentode for portable transceivers, 1.4 V/100 mA filament
- D12F – Acorn RF/IF/AF pentode for portable transceivers, 1.4 V/240 mA filament
DFF
- DFF50 – Dual pentode, B8G Loctal base[147]
- DFF51 – Dual pentode, B8G Loctal base[147]
- DFF101 – Dual pentode, Miniature 7-pin base[147]
DK
- DK1 – Octode pentagrid converter, side-contact 8 base with #4 grid on top cap[148]
- DK21 – Remote-cutoff octode beam pentagrid converter, Octal base, 1.4 V/50 mA filament between nonstandard pins 1 and 8
- DK22 – Octode pentagrid converter, B8G Loctal base[149]
- DK25 – Remote-cutoff octode pentagrid converter, B8G Loctal base
- DK31 – Remote-cutoff octode pentagrid converter, Octal base[149]
- DK32/1A7GT – Remote-cutoff heptode pentagrid converter, Octal base with #4 grid on top cap, 1.4 V/50 mA filament
- DK40 – Remote-cutoff octode pentagrid converter, Rimlock base, 1.4 V/50 mA filament
- DK91/1R5 – Remote-cutoff heptode pentagrid converter, Miniature 7-pin base, 1.4 V/50 mA filament
- DK92/1AC6 – Heptode pentagrid converter, Miniature 7-pin base, 1.4 V/50 mA filament
- DK96/1AB6 – Heptode pentagrid converter, Miniature 7-pin base, 1.4 V/25 mA filament
- DK97 – Heptode pentagrid converter, Miniature 7-pin base, 1.4 V/25 mA filament
- DK192 – Heptode pentagrid converter, Miniature 7-pin base, 1.4 V/50 mA filament
- DK962 – Heptode pentagrid converter, Miniature 7-pin base, 1.2 V/60 mA filament
DL
- DL2 – Power pentode, side-contact 8 base[150]
- DL11 – 350 mW 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, 1.4 V/50 mA filament between nonstandard pins 1 and 8
- DL22 – Power pentode, B8G Loctal base[151]
- DL25 – Power pentode, B8G Loctal base
- DL26 – Power pentode, B8G Loctal base
- DL29/3D6 – 1.4 W VHF beam power pentode up to 50 MHz with a center-tapped 2.8 (series) resp. 1.4 V (parallel) filament, B8G Loctal base
- DL31/1A5 – Power pentode, Octal base[151]
- DL33/3Q5GT – 400 mW AF power pentode, center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Octal base
- DL35/1C5GT – 400 mW Power pentode, Octal base, 1.4 V/100 mA filament
- DL36/1Q5GT – Power pentode, Octal base[150]
- DL41 – 600 mW Power pentode, center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Rimlock base
- DL41w – Bowl Power pentode[33]
- DL51 – Miniature, 1.5 V/130 mA half-indirectly heated power pentode, B4B 4-pin subminiature base with anode on top cap
- DL64 – Subminiature AF power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, for use in hearing aids, UA = 15 V, UAmax = 45 V, 1.25 V/10 mA filament
- DL65 – Subminiature AF power pentode, all-glass round cross-section envelope, circular 5-pin/long wire-ends base, UA = 22.5 V, UAmax = 45 V, 1.25 V/13 mA filament, for use in hearing aids; DL67/6007 with a different pinout
- DL66 – Subminiature AF power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, for use in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/15 mA filament
- DL67/6007 – DL65 with round cross-section envelope, but 5 inline wire-ends
- DL68 – Subminiature AF power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, for use in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/25 mA filament
- DL69 – Subminiature power pentode with a split suppressor grid, its halves tied to the positive resp. negative filament end, all-glass elliptical cross-section envelope with 5 long inline wire-ends, UA = 90 V, 1.25 V/25 mA filament
- DL70 – Subminiature VHF power pentode up to 200 MHz, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use in walkie-talkies, UA = 150 V, 1.25 V/110 mA filament
- DL71 – Subminiature AF power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use in hearing aids, UA = 22.5 V, UAmax = 45 V, 1.25 V/25 mA filament
- DL72 – Subminiature AF power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use in hearing aids, UAmax = 45 V, 1.25 V/25 mA filament
- DL73 (CV2299) – Subminiature VHF power pentode up to 200 MHz, all-glass round cross-section envelope, circular 8-pin/wire-ends base, for use in walkie-talkies, UA = 150 V, 1.25 V/200 mA filament
- DL75 – Subminiature AF power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base[152]
- DL91/1S4 – 270 mW AF power pentode, 1.4 V/100 mA filament, Miniature 7-pin base
- DL92/3S4 – 270 mW AF power pentode with a center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Miniature 7-pin base
- DL93/3A4 – 700 mW RF/AF power pentode with a center-tapped 2.8 V/100 mA (series) resp. 1.4 V/200 mA (parallel) filament, Miniature 7-pin base
- DL94/3V4 – 270 mW AF power pentode with a center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Miniature 7-pin base
- DL95/3Q4 – 270 mW AF power pentode with a center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Miniature 7-pin base
- DL96/3C4 – 200 mW AF power pentode with a center-tapped 2.8 V/25 mA (series) resp. 1.4 V/50 mA (parallel) filament, Miniature 7-pin base
- DL97/3Y4 – Power pentode with a center-tapped filament, Miniature 7-pin base[153]
- DL98/3B4 – 1.25 W RF power pentode with a center-tapped 2.5 V/165 mA (series) resp. 1.25 V/330 mA (parallel) filament, up to 100 MHz, Miniature 7-pin base
- DL161 – Subminiature AF power pentode, all-glass wire-ended, for use in hearing aids
- DL167 – 1.8 mW Subminiature AF power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, 1.25 V/13.3 mA filament, for use in hearing aids
- DL192 – 150 mW AF power pentode with a center-tapped 2.8 V/50 mA (series) resp. 1.4 V/100 mA (parallel) filament, Miniature 7-pin base
- DL193 – 650 mW AF power pentode with a center-tapped 1.4 V/200 mA filament, Miniature 7-pin base
- DL620 – 110 mW Subminiature power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, UAmax = 90 V, 1.25 V/50 mA filament
- DL650 = Raytheon CK532DX – 45 mW Subminiature power pentode, all-glass elliptical cross-section envelope with 5 long inline wire-ends, UAmax = 30 V, 1.25 V/15 mA filament
- DL651 = Raytheon CK546DX – DL650 with a 1.25 V/10 mA filament
- DL761 (6397) – Subminiature RF power pentode, all-glass wire-ended
- DL907 – SW/VHF power pentode, Miniature 7-pin base
- DL962 – 150 mW AF power pentode with a center-tapped 2.4 V/60 mA (series) resp. 1.2 V/120 mA (parallel) filament, Miniature 7-pin base
- DL963 – RF/AF power pentode with a center-tapped 2.4 V/100 mA (series) resp. 1.2 V/200 mA (parallel) filament, Miniature 7-pin base
DLL
- DLL21 (Octal base, filament between 7 and nonstandard pins 1, 8), DLL25 (B8G Loctal base) – 1.5 W Dual AF power pentode, center-tapped 2.8 V/100 mA (series) resp. 1.4 V/200 mA (parallel) filament
- DLL31 – DLL21 with a different pinout
- DLL101 – Dual power pentode, Miniature 7-pin base
- DLL102 – Dual power pentode, Miniature 7-pin base
DM
- DM21 – Top-view, "Magic Eye"-type tuning indicator, Octal base, 1.4 V/25 mA filament
- DM70/1M3 – Side-view, subminiature band-and-dot-type tuning/level indicator, all-glass wire-ended
- DM71/1N3 – Side-view, subminiature band-and-dot-type tuning/level indicator, all-glass wire-ended
- DM160/6977 (ИВ-15↦IV-15) – First vacuum fluorescent display, single segment, side-view, for use as flip-flop status indicator in transistorized computers. All-glass wire-ended, 1 V/30 mA filament; cf. 8569
DY
- DY30/1B3GT = 1Ц7С↦1C7S – 30 kV CRT EHT rectifier, Octal base with anode on top cap
- DY51/1BG2 – Half-indirectly (filament internally tied to cathode sleeve) heated 15 kV portable-TV CRT EHT rectifier, all-glass, filament wires on one end, anode wire on the other
- DY70 – 10 kV CRT EHT rectifier, all-glass with 3 wire-ends, anode on top wire
- DY80/1X2A – 23 kV CRT EHT rectifier, Noval base
- DY86/1S2 = 1Ц21Б↦1C21B – Half-indirectly heated 18 kV CRT EHT rectifier, Noval base; EY86/6S2 or GY86 with a different heater
- DY87/1S2A – EY87/6S2A with a different heater; DY86/1S2 with a silicone-coated envelope to avoid flush-over in high-humidity and low atmospheric-pressure conditions
- DY802/1BQ2 – Half-indirectly heated 20 kV CRT EHT rectifier, Noval base, silicone-coated envelope; EY802 or GY802 with a different heater
- DY900 – Half-indirectly heated 16 kV CRT EHT rectifier, Miniature 7-pin base
E - 6.3 V heater
EA
- EA40 – 7 kV, 25 mA Diode, 4-pin Rimlock base
- EA41 – 150 V, 9 mA Diode, 4-pin Rimlock base
- EA50/2B35 – Diode for TV detectors, 3+1-pin all-glass subminiature with anode on top pin
- EA52/6923 – Instrumentation rectifier diode up to 1 GHz, Rocket-type disk-seal tube
- EA53 – Co-axial instrumentation rectifier diode up to 1 GHz, Rocket-type disk-seal tube
- EA71 – Diode, all-glass elliptical cross-section envelope with 5 inline wire-ends
- EA76 (6489) – Diode, all-glass round cross-section envelope, circular 5-pin/wire-ends base
- EA111 – Diode for time bases, Y8A steel tube base
- EA766 (5704) – Diode, all-glass round cross-section envelope, circular 5-pin/wire-ends base
- EA960 – 100 VPIV VHF Diode, Miniature 7-pin base
- EA961 – 2 kVPIV VHF Diode, Miniature 7-pin base
- EA962 – 100 VPIV VHF Diode with extremely small distance between cathode and anode for extended frequency range, Miniature 7-pin base
EAA
- EAA11 – Dual diode, 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 different heater; EB91 with a shorter envelope
- EAA171 – Dual diode, separate cathodes and separate heaters, gnome tube; UAA171 with a different heater
- EAA766 – Virtual dual diode for use in homing beacons
- E91AA/5726/6AL5W = EAA901S – Dual RF diode, Miniature 7-pin base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
EAB
- EAB1 – Triple diode with common cathode, side-contact 8 base; AAB1 or PAB1 with a different heater
EABC
- EABC80/6AK8 = M-OV/GEC DH719 (6T8, 6T8A) – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in post-war European AM/FM radios; 5T8, HABC80/19T8, PABC80/9AK8 or UABC80/27AK8 with a different heater
EAC
- EAC91 – Diode/triode UHF mixer, Miniature 7-pin base
EAF
- EAF21 – Diode + remote-cutoff RF/IF/AF pentode, B8G Loctal base; UAF21 with a different heater
- EAF41 – Diode + remote-cutoff RF/IF/AF pentode, Rimlock base; UAF41 with a different heater
- EAF42/6CT7 – Diode + remote-cutoff RF/IF/AF pentode, Rimlock base
- EAF801 – Diode + remote-cutoff RF/IF pentode, Noval base
EAM
- EAM86/6GX8 – Diode + side-view, horizontal band-type tuning/level indicator, Noval base - the diode is to rectify the audio signal when indicating a recording level or a modulation depth
EB
- EB1 – Common cathode dual diode, side-contact 5 base
- EB2 – Common cathode dual diode, side-contact 5 base[134]
- EB4 – Separate cathodes dual diode; EB11 or EB34 with a side-contact 8 base
- EB11 – Separate cathodes dual diode; EB4 or EB34 with a Y8A steel tube base
- EB34 – Separate cathodes dual diode; EB4 or EB11 with an Octal base
- EB40 – Common cathode dual diode, Rimlock base
- EB41 – Separate cathodes dual diode, Rimlock base; UB41 with a different heater
- EB91 – Separate cathodes dual diode, Miniature 7-pin base, for FM ratio detectors; EAA91/6AL5 with a longer envelope
EBC
- EBC1 – Dual diode + AF triode, side-contact 8 base with triode grid on top cap; ABC1 with a different heater
- EBC3 – Common cathode dual diode + AF triode, side-contact 8 base with triode grid on top cap
- EBC11 – Common cathode dual diode + AF triode, Y8A steel tube base
- EBC33/6Q7 – Common cathode dual diode + AF triode; EBC3 with an Octal base
- EBC41/6CV7 – Shielded common cathode dual diode + AF triode; UBC41 with a different heater; EBC81/6BD7A with a Rimlock base
- EBC80/6BD7 – Shielded dual diode + AF triode, Noval base
- EBC81/6BD7A – Shielded common cathode dual diode + AF triode; UBC81 with a different heater; EBC41 with a Noval base
- EBC90/6AT6 – Common cathode dual diode + high-μ AF triode for use in FM ratio detectors, triode μ = 70, Miniature 7-pin base; HBC90/12AT6 with a different heater
- EBC91/6AV6 – Common cathode dual diode + high-μ AF triode for use 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 different heater
EBF
- EBF1 (6B7) – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, side-contact 8 base with control grid on top cap[154]
- EBF2 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode with control grid on top cap; 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 different heater
- EBF15 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, Y8A steel tube base; UBF15 with a different heater
- EBF21 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, B8G Loctal base[155]
- EBF32 (6B8) – EBF2G with heater between standard pins 2 and 7
- 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, Noval base
- EBF81/6AD8 – Common cathode dual diode + remote-cutoff pentode, Noval base
- EBF83/6DR8 – Common cathode dual diode + low (6.3-50 V) anode voltage sharp-cutoff pentode for use as IF amplifier, detector and AGC diode in vehicle equipment, Noval base
- EBF89/6DC8/7125 – Common cathode dual diode + semiremote-cutoff RF/IF pentode, Noval base
- EBF171 – Dual diode + remote-cutoff RF/IF/AF pentode - the first gnome tube; a modified and repackaged EBF11; UBF171 with a different heater
- EBF175 – Common cathode dual diode + remote-cutoff RF/IF/AF pentode,[156] prototype only
EBL
- EBL1 – Dual diode + 9-watts power pentode; EBL21 or EBL31 with a side-contact 8 base; ABL1 with a different heater
- EBL21 = EBL71 – Dual diode + power pentode; EBL1 or EBL31 with a B8G Loctal base
- EBL31 – Dual diode + power pentode; EBL1 or EBL21 with an Octal base
EC
- EC2 – Triode for use as AF amplifier or as oscillator, side-contact 8 base; AC2 with a different heater
- EC21 – Triode, B8G Loctal base[157]
- EC31 – Triode, Octal base[158]
- EC40 – VHF Triode up to 500 MHz; EC80 with a B8A Rimlock base
- EC41 – UHF oscillator triode; EC81 with a B8A Rimlock base
- EC50 – Helium-filled triode thyratron for use as a horizontal sweep, sawtooth waveform generator in oscilloscopes, side-contact 8 base with anode on top cap
- EC52 – RF triode for use as an oscillator, B9G 9-pin Loctal base
- EC53 – VHF triode for use as an oscillator up to 600 MHz, 3-pin base with grid and anode on top pins
- EC54 – Triode, B9G 9-pin Loctal base[159]
- EC55/5861 = La Radiotechnique R243 – 3 GHz, 10 W Rocket-type disk-seal UHF triode
- EC56 – 4 GHz Lighthouse-type disk-seal microwave triode
- EC57 (EC157) – Lighthouse-type disk-seal microwave triode
- EC70/6K4/6778 – Subminiature UHF triode for use as an oscillator in the 500 MHz range, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EC71/5718 – Subminiature UHF triode up tp 1 GHz, for use as an oscillator in the 500 MHz range, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EC80/6Q4 – VHF Triode up to 500 MHz, Noval base
- EC81/6R4 – UHF oscillator triode, Noval base
- EC84/6AJ4 – High-μ triode, Noval base
- EC86/6CM4 – UHF triode, Noval base; PC86/4CM4 with a different heater
- EC88/6DL4 – UHF triode, Noval base; PC88/4DL4 with a different heater. This and the EC86 were often encountered in UHF TV tuners, the latter as a self oscillating mixer
- EC90/6C4 (6100) – 3.6 W Small-power VHF triode up to 150 MHz, Miniature 7-pin base; single ECC82/12AU7 system
- EC91/6AQ4 – VHF triode up to 250 MHz, Miniature 7-pin base
- EC92/6AB4 – VHF triode for FM receiver front ends, Miniature 7-pin base, single ECC81/12AT7 system; UC92/9AB4 with a different heater
- EC93/6BS4 – UHF Medium-μ oscillator triode, Miniature 7-pin base[160]
- EC94/6AF4 – UHF Medium-μ oscillator triode, Miniature 7-pin base
- EC95/6ER5 – Vari-μ VHF triode, Miniature 7-pin base; PC95/4ER5 or XC95/2ER5 with a different heater
- EC97/6FY5 – Frame-grid VHF triode, Miniature 7-pin base; PC97/4FY5 or XC97/2FY5 with a different heater
- EC98/6J4 = 6С2П↦6S2P – UHF triode, Miniature 7-pin base
- EC157/8108 – 4 GHz, 12.5 W Lighthouse-type disk-seal microwave triode
- EC158 – Low-voltage, 4 GHz, 30 W Lighthouse-type disk-seal microwave triode
- EC162 – RF power triode, Y8A steel tube base
- EC360 (Center-tapped heater), EC362 (anode on top cap) – Triodes, Octal base, for use in power supplies
- EC560 (2C40) – Lighthouse-type disk-seal microwave triode
- EC562 (2C39B) – Oil can-type disk-seal microwave triode
- EC760 (EC71/5718) – Subminiature VHF oscillator/mixer triode up to 500 MHz, all-glass round cross-section envelope, circular 7-pin/wire-ends base
- EC860 – 20 mAavg, 500 mApk Helium-filled grid-turn-off triode thyratron e.g. for relaxation oscillators up to 150 kHz, Noval base; cf. 6441, 20TC4, 30TC1
- EC866 – Low-noise UHF triode, Noval base
- EC900/6HA5 – Frame-grid vari-μ VHF triode, Miniature 7-pin base; LC900/3HA5, PC900/4HA5 or XC900/2HA5 with a different heater
- EC903 – RF/IF Triode, Miniature 7-pin base[161]
- EC1000/8254 – Triode for use as amplifier in probes, 8-pin all-glass wire-ended with grid on top wire, shock/vibration resistant
- EC1010 (6С53Н↦6S53N) – Nuvistor ceramic/metal UHF triode
- EC1030 – Indirectly heated UHF triode, all-glass round cross-section envelope with 8 circular, tinned, 38 mm long wire-ends, hot-standby resistant (no cathode interface/poisoning after prolonged periods in cut-off)
- EC1031 – EC1030 with 5.5 mm long, gold-plated pins for insertion into a special socket, no cathode poisoning after prolonged periods in cut-off
- EC8010/8556 – UHF triode for use as amplifier or oscillator up to 1 GHz, Noval base, shock/vibration resistant
- EC8020 – UHF triode, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E1C = Philips 4671 (955) – Acorn UHF triode
- E20C – RF triode for wideband cascode circuits, B8G Loctal base[135]
- E86C = EC806S – UHF triode up to 800 MHz, dual anode and cathode pins and triple grid pins for use as grounded-grid amplifier, Noval base with gold-plated pins, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E88C/8255 – UHF triode up to 1 GHz, quintuple grid pins for use as grounded-grid amplifier, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
ECC
- ECC31 – Common cathode dual AF power triode, Octal base[162]
- ECC32/6SN7 (6Н8С↦6N8S) – Separate cathodes dual AF triode, Octal base
- ECC33 – Separate cathodes dual high-μ triode for use as a flip-flop, Octal base
- ECC34 – Separate cathodes dual triode for use as a CRT vertical deflection power multivibrator, Octal base
- ECC35/6SL7 (6Н9С↦6N9S) – Separate cathodes dual high-μ AF triode, Octal base
- ECC40 – Separate cathodes dual AF triode, Rimlock base
- ECC70/6021 – Subminiature, separate cathodes dual VHF medium-μ triode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- ECC81/12AT7 = M-OV/GEC B309 (6060, 6201, M8162) – Dual high-μ triode with a center-tapped heater, for use as RF amplifier/mixer in VHF circuits, Noval base
- ECC82/12AU7 = M-OV/GEC B329 (6067, 6189, M8136) – Dual medium-μ triode with a center-tapped heater for use as AF amplifier, Noval base; XCC82/7AU7 with a different heater. Two EC90/6C4s in one envelope;[72] however, it is only specified as an audio frequency device
- ECC83/12AX7 = M-OV/GEC B339 (6Н2П↦6N2P, 6057, 6681, M8137) – Dual high-μ triode with a center-tapped heater for use as a high-gain AF amplifier, 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, Noval base; PCC84/7AN7 or UCC84 with a different heater
- ECC85/6AQ8 – Dual triode for use as VHF oscillator/mixer up to 200 MHz, Noval base; HCC85/17EW8, PCC85/9AQ8 or UCC85 with a different heater
- ECC86/6GM8 = 6Н27П↦6N27P – Dual low (6.3-25 V) anode voltage triode, Noval base, for use in VHF tuners in vehicle equipment
- ECC87 (E80CC/6085) – ECC40 with a Noval base, allowing for a heater center-tap[163]
- ECC88/6DJ8 = 6Н23П↦6N23P – Dual triode used as RF cascode amplifier in TV tuners and VHF receiver front ends, or as general-purpose instrumentation dual triode, Noval base; PCC88/7DJ8 with a different heater
- ECC89/6FC7 = 6Н24П↦6N24P – Dual triode used as RF cascode amplifier in TV tuners and VHF receiver front ends, or as general-purpose instrumentation dual triode, Noval base
- Notes:
- All ECC8x have separate cathodes
- ECC81, 82, 83 & 87 have the individual 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 12V types), which was useful in dual-system (6V and 12V) car radios
- 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
- Notes:
- ECC91/6J6 = 6H15П↦6N15P – Common cathode dual VHF triode up to 600 MHz, Miniature 7-pin base
- ECC92 – Common cathode dual triode for use as a flip-flop in computers, Miniature 7-pin base
- ECC99 – Separate cathodes dual RF triode, Noval[136] base
- ECC171 – Separate cathodes and separate heaters dual triode, 11-pin gnome tube with internal shield, prototype only; UCC171 with a different heater
- ECC180/6BQ7A (6Н1П↦6N1P) – Separate cathodes dual VHF triode for use as cascode amplifier, Noval base
- ECC186/7316 – Separate cathodes dual triode for use in digital computers, Noval base, no cathode interface/poisoning after prolonged periods in cut-off
- ECC189/6ES8 – Separate cathodes dual vari-μ VHF triode for use as cascode amplifier, Noval base; PCC189/7ES8, XCC189/4ES8 or YCC189/5ES8 with a different heater
- ECC230/6AS7G = 6Н13С↦6N13S (6080) – Separate cathodes dual low-μ power[136] triode for use as series regulator in DC power supplies, servo applications, or as a horizontal booster triode in TV monitors, Octal base
- ECC802 – Separate cathodes dual triode, Noval base
- ECC803 – Separate cathodes dual triode, Noval base
- ECC804/6GA8 – Separate cathodes dual triode, Noval base[164]
- ECC807 – Separate cathodes dual AF triode for high-gain preamplifiers, Noval base
- ECC808/6KX8 – Separate cathodes dual AF triode for use as record head output tube in tape recorders, Noval base
- ECC812 – Separate cathodes dual shielded triode for color TV chrominance outputs in SECAM TV receivers, Noval base
- ECC813 (6463) – Separate cathodes dual triode for computer circuits, heaters internally series-connected, with the midpoint on a separate pin, Noval base
- ECC832/12DW7/7247 – Dual dissimilar AF triode, a combination of one ECC83/12AX7 system for use as a high-gain amplifier and one ECC82/12AU7 system for use as a phase inverter or cathode follower, Noval base
- ECC863 – Separate cathodes dual triode with an internal screen between the sections
- ECC865 – Long-life version of the ECC85
- ECC960, ECC962 – Common cathode dual triode for use as a flip-flop in computers, Miniature 7-pin base
- ECC2000 – Separate cathodes dual VHF triode with neutralization screen, for use as cascode amplifier up to 300 MHz, Decal base with gold-plated pins, shock/vibration resistant
- ECC8100 – Separate cathodes dual VHF triode with neutralization screen ("Neutrode") connected to the heater, for use as cascode amplifier, Noval base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- E80CC/6085 – Separate cathodes dual triode for use as DC or AF amplifier, center-tapped 12.6 V/300 mA (series) resp. 6.3 V/600 mA (parallel) heater, Noval base, shock/vibration resistant
- E81CC/6201 = ECC801S = 12AT7WA (6060) – Separate cathodes dual triode for AF and RF amplifiers, mixers up to 300 MHz, oscillators or impulse circuits, center-tapped 12.6 V/150 mA (series) resp. 6.3 V/300 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant; premium version of ECC81/12AT7
- E82CC/6189 = ECC802S = 12AU7WA (6067) – Separate cathodes dual triode for use as amplifier or multivibrator, center-tapped 12.6 V/150 mA (series) resp. 6.3 V/300 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant; premium version of ECC82/12AU7
- E83CC/6681 = 12AX7WA (ECC803S/6057) – Separate cathodes low-microphonics dual triode, center-tapped 12.6 V/150 mA (series) resp. 6.3 V/300 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant; premium version of ECC83/12AX7
- E86CC/6463 – Separate cathodes dual triode for computer circuits, heaters internally series-connected, with the midpoint on a separate pin, Noval base
- E88CC/6922 – Separate cathodes dual triode, Noval base with gold-plated pins, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E90CC/5920 – Common cathode dual triode for use as a flip-flop in computers, Miniature 7-pin base, no cathode poisoning after prolonged periods in cut-off
- E92CC – Common cathode dual triode for use as a flip-flop in computers, Miniature 7-pin base, no cathode poisoning after prolonged periods in cut-off, not recommended where low hum or microphony or noise is critical
- E180CC/7062 – Separate cathodes dual triode for use as a flip-flop in computers, center-tapped 12.6 V/200 mA (series) resp. 6.3 V/400 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, not recommended where low hum or microphony or noise is critical
- E181CC/7118 – Separate cathodes dual triode for use in digital computers, center-tapped 12.6 V/200 mA (series) resp. 6.3 V/400 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, not recommended where low hum or microphony or noise is critical
- E182CC/7119 – Separate cathodes dual triode for use as a flip-flop in computers, center-tapped 12.6 V/320 mA (series) resp. 6.3 V/640 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, not recommended where low hum or microphony or noise is critical
- E188CC/7308 – Separate cathodes dual low-microphonics triode for use as RF/IF/AF amplifier, Noval base, shock/vibration resistant
- E283CC – Separate cathodes dual low-hum, low-microphonics triode for use as AF or instrumentation amplifier, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E288CC/8223 – Separate cathodes dual triode for use in wideband, low-noise IF, RF and cascode amplifiers, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
ECF
- ECF1 – AF Triode + remote-cutoff IF pentode, side-contact 8 base with pentode control grid on top cap
- ECF12 – Triode + sharp-cutoff pentode for use as RF amplifier and superregenerative FM detector, Y8A steel tube base; UCF12 with a different heater
- ECF80/6BL8 = 6Ф1П↦6F1P – VHF oscillator/mixer triode/pentode, Noval base; LCF80/6LN8, PCF80/9A8, UCF80 or XCF80/4BL8 with a different heater
- ECF82/6U8 – VHF oscillator/mixer triode/pentode, Noval base; PCF82/9U8A or XCF82/5U8 with a different heater
- ECF83 – Low-microphonics VHF oscillator/mixer triode/remote-cutoff pentode, Noval base, for vehicle equipment
- ECF86/6HG8 – VHF oscillator/mixer triode/pentode, Noval base; LCF86/5HG8, PCF86/7HG8, 8HG8 or XCF86/4HG8 with a different heater
- ECF174 – Triode + pentode, gnome tube, prototype only; UCF174 with a different heater
- ECF200/6X9 – Triode + sharp-cutoff pentode for use as IF amplifier in TV receivers, Decal base; LCF200/5X9 or PCF200/8X9 with a different heater
- ECF201/6U9 – Triode + remote-cutoff pentode for use as IF amplifier and sync sep in TV receivers, Decal base; LCF201/5U9 or PCF201/8U9 with a different heater
- ECF202/6AJ9 – Triode + sharp-cutoff pentode for use as SECAM chroma signal demodulators in analog color TV receivers, Decal base
- ECF801/6GJ7 – Frame-grid triode + remote-cutoff pentode for use as VHF mixer in TV receivers, Noval base; LCF801/5GJ7, PCF801/8GJ7 or XCF801/4GJ7 with a different heater
- ECF802/6JW8 – Triode + sharp-cutoff pentode for use as reactance and sinewave oscillator in TV receivers, Noval base; LCF802/6LX8, PCF802/9JW8 or 5JW8 with a different heater
- ECF803 – ECF801/6GJ7 with separate cathodes
- ECF804 – Triode + sharp-cutoff pentode for use as wideband amplifier, Noval base; PCF804 with a different heater
- ECF805/6GV7 – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers, Noval base; PCF805/7GV7 with a different heater
- ECF812 = EdiSwan 6FL2 – Triode + low-power semiremote-cutoff beam tetrode, Noval base;[165] PCF812 (=30FL2) with a different heater
- ECF8070 – Triode + pentode, no cathode interface/poisoning after prolonged periods in cut-off
- E80CF/7643 – Triode + pentode, separate cathodes, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
ECH
- ECH2 – Triode/remote-cutoff heptode mixer, side-contact 8 base[166]
- ECH3 – Triode/remote-cutoff hexode mixer, ECH33 with a side-contact 8 base
- ECH3G – ECH3 with an Octal base
- ECH4, ECH4K, ECH4N – Triode/remote-cutoff heptode mixer, ECH21 with a side-contact 8 base
- ECH4G – ECH4 with an Octal base
- ECH11 – Triode/remote-cutoff hexode mixer, Y8A steel tube base; VCH11 with a different heater
- ECH21 = ECH71 (M-OV/GEC X143) – Triode/remote-cutoff heptode mixer; ECH4 with a B8G Loctal base
- ECH33 = ECH3G
- ECH34 = ECH4G
- ECH35 (M-OV/GEC X147) – Triode/remote-cutoff hexode mixer, Octal base
- ECH41 – Triode/remote-cutoff hexode mixer, Rimlock base
- ECH42/6CU7 – Triode/remote-cutoff hexode mixer; ECH80/6AN7 with a Rimlock base; UCH42 with a different heater
- ECH43 – Triode/remote-cutoff hexode mixer, Rimlock base, low-microphonics version of ECH42; UCH43 with a different heater
- ECH80/6AN7 – Triode/remote-cutoff hexode mixer;[135] ECH42/6CU7 with a Noval base
- ECH81/6AJ8 = M-OV/GEC X719 = 6И1П↦6I1P – Triode/remote-cutoff heptode mixer, Noval base; XCH81/3AJ8 with a different heater
- ECH83/6DS8 – Low (6.3-25 V) anode voltage, triode/sharp-cutoff heptode mixer, Noval base, for use in vehicle equipment
- ECH84/6JX8 (6И3П↦6I3P) – Triode/sharp-cutoff heptode TV sync sep, Noval base
- ECH171 – Triode/remote-cutoff heptode mixer, gnome tube; UCH171 with a different heater
- ECH200/6V9 = 6И4П↦6I4P – Triode/sharp-cutoff heptode TV sync sep, Decal base; PCH200 with a different heater
- ECH8000 – Triode/remote-cutoff heptode mixer, Noval base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- E81CH – Triode/remote-cutoff heptode mixer, Noval base
ECL
- ECL11 – AF Triode + AF power tetrode, Y8A steel tube base
- ECL80/6AB8 – Triode + power pentode, Noval base
- ECL81 – Triode + power pentode; PCL81 with a different heater
- ECL82/6BM8 = 6Ф3П↦6F3P – AF Triode + AF power pentode; LCL82/11BM8, PCL82/16A8, UCL82/50BM8 or XCL82/8B8 with a different heater
- ECL83 – AF Triode + AF power pentode; PCL83 with a different heater
- ECL84/6DX8 = 6Ф4П↦6F4P – TV sync sep triode + CRT cathode drive power pentode; LCL84/10DX8, PCL84/15DQ8 or XCL84/8DX8 with a different heater
- ECL85/6GV8 = 6Ф5П↦6F5P – Triode + power pentode used in TV receivers for vertical timebase, generally as a multivibrator, with the pentode section doubling as one half of the multivibrator and the power output device; LCL85/10GV8, PCL85/18GV8 or XCL85/9GV8 with a different heater
- ECL86/6GW8 – AF Triode + AF power pentode, used for audio amplification in European TV receivers; PCL86/14GW8 with a different heater
- ECL113 – Triode + AF power pentode, Rimlock base
- ECL200 – Triode + CRT drive power pentode, Decal base; PCL200 with a different heater
- ECL802 – Triode + Power pentode for use as vertical oscillator and output tube in TV receivers, Noval base
- ECL805 – Triode + Power pentode with separate cathodes; PCL805 with a different heater, Noval base
ECLL
- ECLL800 – Triode + dual screened power pentode, for 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, Noval base[167]
ED
- ED100 – Power triode for use in telephone equipment, O5A European 5-pin base
- ED111 – 6 W VHF power triode up to 85 MHz, Rimlock base
- ED500/6ED4 – PD500/9ED4 with a different heater, Magnoval base, considerable X-radiation despite the envelope being fabricated from lead glass
- ED501 – 27 kV Color CRT EHT shunt stabilizer triode, Magnoval base
- ED8000 – Power triode for use in series-pass voltage regulators, Noval base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
EDD
- EDD11, EDD111 – Dual power triode, Y8A steel tube base
- EDD171 – Dual high-μ power triode, gnome tube, prototype only
EE
- EE1 = EEP1 = Philips 4696 – Single-ended secondary emission amplifier for use as a wideband amplifier and phase inverter, side-contact 8 base with control grid on top cap
- EE50 – Single-ended secondary emission amplifier, B9G 9-pin Loctal base, for use in TV receivers
EEL
- EEL71 – AF Tetrode + AF power pentode, B8G 8-pin Loctal base, for use as audion detector, AF preamplifier, AF power amplifier
- EEL171 – Remote-cutoff tetrode + 4-Watt power pentode, gnome tube; UEL171 with a different heater
EEP
- EEP1 = EE1 = Philips 4696
EF
- EF1 – Sharp-cutoff RF/IF pentode, side-contact 8 base with control grid on top cap[134]
- EF2 – Remote-cutoff RF/IF pentode, side-contact 8 base with control grid on top cap[134]
- EF3 – Remote-cutoff RF/IF pentode, side-contact 8 base with control grid on top cap[134]
- EF5 – Remote-cutoff pentode, side-contact 8 base with control grid on top cap
- EF6, EF6N – Sharp-cutoff AF pentode; 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;[134] AF7, CF7 or VF7 with a 6.3 V heater
- EF8 – Selektode, a remote-cutoff pentode with a beam-forming extra grid between control and screen grids, intended to reduce screen current and hence anode/screen grid distribution noise (technically a hexode), EF38 with a side-contact 8 base with control grid on top cap; cf. DAH50, 6FS5, 6GU5
- EF9 – Remote-cutoff RF/IF/AF pentode; EF22/7B7, EF39/6K7 or EF41/6CJ5 with a side-contact 8 base with control grid on top cap
- EF11 – Remote-cutoff pentode, Y8A steel tube base
- EF12, EF12K (Low microphonics), EF12spezial – Sharp-cutoff pentode, Y8A steel tube base
- EF13 – Remote-cutoff pentode, Y8A steel tube base
- EF14 – Sharp-cutoff pentode, Y8A steel tube base; UF14 and VF14 with a different heater
- EF15 – Remote-cutoff pentode, Y8A steel tube base; UF15 with a different heater
- EF21 – Remote-cutoff pentode, both 8- or 9-pin Loctal base[168]
- EF22/7B7 – Remote-cutoff RF/IF/AF pentode; EF9, EF39/6K7 and EF41/6CJ5 with a B8G Loctal base
- EF27 – Sharp-cutoff AF pentode, B8G Loctal base
- EF36 – Sharp-cutoff pentode for use as a tuned RF amplifier, a (second) detector, or an AF amplifier; EF6 with an Octal base with control grid on top cap
- EF37/6J7G – EF36 with low hum and microphonics
- EF38 – EF8 with an Octal base[135]
- EF39/6K7 – Remote-cutoff RF pentode for use as an IF amplifier or as a superheterodyne mixer (1st detector), also used in test equipment; EF4, EF22/7B7 or EF41/6CJ5 with an Octal base with control grid on top cap
- EF40 – Sharp-cutoff AF pentode, Rimlock base
- EF41/6CJ5 (Cossor 62VP) – Remote-cutoff RF/IF pentode; EF4, EF22/7B7 or EF39/6K7 with a Rimlock base
- EF42 – Sharp-cutoff RF pentode; EF52 with a Rimlock base
- EF43 – Remote-cutoff RF pentode, Rimlock base
- EF50, EF50N, EF53 – Remote-cutoff pentode for use in the IF stages of 1940s TV and radar receivers, B9G 9-pin Loctal base
- EF51 – Remote-cutoff pentode, B8G Loctal base
- EF52 – Sharp-cutoff RF pentode; EF42 with a B8G Loctal base
- EF54 – Sharp-cutoff RF pentode, B9G 9-pin Loctal base
- EF55 – Sharp-cutoff RF/video pentode, B9G 9-pin Loctal base
- EF59 – RF pentode, B9G 9-pin Loctal base
- EF70 – Subminiature sharp-cutoff pentode, suppressor grid available on separate wire and internally connected to a separate diode to prevent positive grid voltage, for use as a NAND gate in coincidence circuits, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF71/5899 – Subminiature remote-cutoff pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF72 – Subminiature sharp-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF73 – Subminiature sharp-cutoff pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF74 – Subminiature, low-microphonics pentode, 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 different heater
- EF81/6BH5 – Remote-cutoff RF/IF/Video pentode, Noval base
- EF83 – Remote-cutoff AF pentode, Noval base
- EF85/6BY7 = M-OV/GEC W719 – Remote-cutoff wideband RF pentode, Noval base; HF85 or XF85 with a different 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 or UF86 with a different heater
- EF89/6DA6 – Remote-cutoff VHF pentode, Noval base
- EF91/6AM6 = M-OV/GEC Z77 = Brimar 8D3 (6064, M8083) – Sharp-cutoff pentode, Miniature 7-pin base
- EF92/6CQ6 (M8161) – Remote-cutoff RF pentode, Miniature 7-pin base
- EF93/6BA6 = M-OV/GEC W727 = 6К4П↦6K4P (5749) – Remote-cutoff RF pentode, Miniature 7-pin base; HF93/12BA6 with a different heater
- EF94/6AU6 – Sharp-cutoff RF/IF/AF pentode, Miniature 7-pin base; HF94/12AU6 or XF94/3AU6 with a different heater
- EF95/6AK5 = 6Ж1П↦6J1P (5654, CV4010, 408A) – VHF/RF/IF Sharp-cutoff pentode, Miniature 7-pin base
- EF96/6AG5 = 6Ж3П↦6J3P – Sharp-cutoff RF pentode, Miniature 7-pin base
- EF97/6ES6 = 6К8П↦6K8P – Low (6.3-50 V) anode voltage, remote-cutoff RF/IF pentode, for use in vehicle equipment, Miniature 7-pin base
- EF98/6ET6 – Low (6.3-50 V) anode voltage, sharp-cutoff pentode, for use as oscillator or IF/AF amplifier in vehicle equipment, Miniature 7-pin base
- EF111 – Remote-cutoff pentode, Y8A steel tube base
- EF112 – Sharp-cutoff pentode, Y8A steel tube base
- EF172 – RF/IF/AF Pentode, gnome tube; UF172 with a different heater
- EF174 – Pentode, gnome tube; UF174 with a different heater
- EF175 – Remote-cutoff RF/IF pentode, gnome tube; UF175 with a different heater
- EF176 – VHF Pentode, gnome tube, prototype only; UF176 with a different heater
- EF177 – VHF Pentode, gnome tube, prototype only; UF177 with a different heater
- EF183/6EH7 = 6К13П↦6K13P – Frame-grid, remote-cutoff IF pentode for use in TV receivers; LF183/YF183/4EH7 or XF183/3EH7 with a different heater[169]
- EF184/6EJ7 = 6Ж51П↦6J51P – Frame-grid, sharp-cutoff IF pentode for use in TV receivers; LF184/YF184/4EJ7 or XF184/3EJ7 with a different heater[170]
- EF190/6CB6 – Remote-cutoff RF pentode for use in video IF circuits
- EF410 – RF/IF Pentode, Rimlock B8A base
- EF730/5636 – Subminiature dual-control, sharp-cutoff RF/IF pentode for use as a gated or gain-controlled amplifier, all-glass round cross-section envelope, circular 8-pin/wire-ends base; similar to 5784
- EF731 – Subminiature remote-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF732 – Subminiature sharp-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF734 – Subminiature sharp-cutoff RF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF761 – Subminiature remote-cutoff RF/IF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF762 – Subminiature sharp-cutoff RF/IF pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EF800 – Long-life sharp-cutoff RF/IF pentode
- EF802 – Long-life sharp-cutoff RF/IF pentode
- EF804 – Sharp-cutoff, low-hum, low-microphonics AF pentode
- EF812 – RF/IF Pentode[171]
- EF814 – RF/IF Pentode[172]
- EF816 – Dual-anode pentode for TV receiver sync sep service
- EF860 – Long-life sharp-cutoff RF pentode for use as preamplifier in telecomms wide-area receivers; IF860 with a 300 mA heater
- EF861 – Wideband pentode
- EF866 – AF pentode
- EF905 = E95F/6AK5W/5654
- EF804S – Ruggedized, long-life version of EF804
- EF805S – Long-life remote-cutoff RF/IF pentode
- EF806S/6267 – Ruggedized, long-life AF pentode
- EF5000 – Secondary emission wideband pentode, Magnoval base[136]
- EF8010 – Remote-cutoff RF/IF pentode, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- E1F = Philips 4672 (954) – Acorn UHF pentode
- E2F = Philips 4695 (956) – Acorn UHF pentode
- E3F – E13F with a hand grip
- E13F – Acorn remote-cutoff RF/IF/AF signal/power pentode for portable transceivers
- E80F/6084 – AF or electrometer pentode, gold-plated pins
- E83F/6689 – Long-life, wideband pentode for use in telephone equipment, gold-plated pins, long-life >10000h
- E85F (EF805S) – Remote-cutoff RF/IF Pentode
- E88F, E88FN – RF/IF Pentode, long-life >10000h
- E90F/6BH6/7693 – RF Pentode, Miniature 7-pin base, shock/vibration resistant
- E95F/6AK5W/5654 – VHF/RF/IF Sharp-cutoff pentode, Miniature 7-pin base, shock/vibration resistant
- E99F/6BJ6/7694 – Remote-cutoff RF pentode, Miniature 7-pin base, shock/vibration resistant
- E180F/6688 = 6Ж9П↦6J9P – Wideband pentode for use as amplifier in professional equipment
- E186F/7737 – Wideband, low-microphonics pentode for use as amplifier, shock/vibration resistant
- E280F/7722 – Wideband pentode for use as low-noise amplifier up to 300 MHz, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- E282F – Wideband pentode for use as amplifier up to 250 MHz, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E810F/7788 – Wideband pentode, gold-plated pins, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
EFF
- EFF50 – Dual VHF pentode, B9G 9-pin Loctal base[173]
- EFF51 – Dual VHF pentode up to 500 MHz, B9G 9-pin Loctal base
EFL
- EFL200/6Y9 = 6Р4П↦6R4P – Sync sep pentode + CRT cathode drive power pentode, Decal base; LFL200/11Y9 or PFL200/16Y9 with a different heater
EFM
- 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, 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, Y8A steel tube base
EFP
- EFP60 – Secondary emission wideband pentode for TV amplifiers, B9G 9-pin Loctal base
EH
- EH1 – Remote-cutoff hexode pentagrid converter, side-contact 8 base with control #1 grid on top cap, separate oscillator[134]
- EH2 – Remote-cutoff heptode pentagrid converter, side-contact 8 base with #4 grid on top cap, separate oscillator
- EH11 – Heptode; superseded by ECH11
- EH81 – Heptode for use as FM detector
- EH90/6CS6 – Dual-control heptode for use as gated amplifier or combined sync sep/clipper in TV receivers
- EH171 – Sharp-cutoff heptode, gnome tube, prototype only
- EH860 – Heptode; superseded in 1957 by EH90/6CS6
- EH900 – Dual-control switching heptode designed for high speed digital computers
- EH900S/5915 = EH960 – Dual-control switching heptode, designed for high speed digital computers, no cathode interface/poisoning after prolonged periods in cut-off
- E81H – Heptode for use as FM detector
- E91H/6687 – Dual-control heptode with a passivated #3 grid to reduce secondary emission, for use as a NAND gate in a coincidence circuit
EK
- EK1 – Octode pentagrid converter, side-contact 8 base with #4 grid on top cap[134]
- EK2 – Remote-cutoff octode pentagrid converter; EK32 with a side-contact 8 base with #4 grid on top cap; similar to AK2
- EK2G/GT – EK2 with an Octal base
- EK3 – Remote-cutoff beam octode pentagrid converter, side-contact 8 base with #4 grid on top cap; similar to AK2; CK3 with a different heater
- EK32 = EK2G/GT
- EK90/6BE6 = M-OV/GEC X727 = 6А2П↦6A2P (5750) – Heptode pentagrid converter; HK90/12BE6 with a different heater
EL
- EL1 – Power pentode, side-contact 8 base with control grid on top cap[134]
- EL2 – Power pentode; EL32 with a side-contact 8 base with control grid on top cap
- EL3, EL3N – Power pentode; EL11 or EL33 with a side-contact 8 base
- EL3G (6V6) – EL3(N) with an Octal base
- EL5 – Power pentode; AL5 with a different heater; EL35 with a side-contact 8 base
- EL6, EL6spezial – Power pentode; EL12(N) with a side-contact 8 base
- EL8 – Power pentode; EL13 with a side-contact 8 base
- EL11 – Power pentode; EL3(N) or EL33 with a Y8A steel tube base
- EL12, EL12N, EL12spezial – Power pentode; EL6 with a Y8A steel tube base
- EL13 – Power pentode; EL8 with a Y8A steel tube base
- EL20 – Power pentode, B8G Loctal base[174]
- EL21 – Power pentode, B8G Loctal base;[175] related to UL21/UL71; not related to EL71/5902
- EL22 – Power pentode, B8G Loctal base[174]
- EL30 – Power pentode, Octal base[176]
- EL31 – Power pentode, Octal base, very similar to EL38/6CN6
- EL32 – Power pentode; EL2 with an Octal base
- EL33 (6AG6G, 6M6G) – Power pentode; EL3(N) or EL11 with an Octal base
- EL34/6CA7 = 6П27С↦6P27S – Power pentode, Octal base
- EL35 – Power pentode; EL5 with an Octal base
- EL36/6CM5 = 6П31С↦6P31S – AF or CRT horizontal deflection output power pentode; EL12(N) with an Octal base; XL36/13CM5 with a different heater
- EL37 (6L6) – Power pentode, Octal base
- EL38/6CN6 – Power pentode, Octal base; PL38 with a different heater
- EL39 – Power pentode, Octal base[177]
- EL41/6CK5 = M-OV/GEC N150 – 3.9 W AF power pentode; EL80 with a Rimlock base
- EL42 = M-OV/GEC N151 – Power pentode; EL85 with a Rimlock base
- EL43 – Power pentode, Rimlock base[178]
- EL44 – Power pentode, Rimlock base; UL44 with a different heater
- EL50 = Philips 4654 – 80 W Power pentode, side-contact 8 base with anode on top cap
- EL51 – 140 W Power pentode, side-contact 8 base with anode on top cap
- EL53 – Power pentode, side-contact 8 base[179]
- EL54 – Power pentode, side-contact 8 base[180]
- EL60 – Power pentode; EL34 with a B9G 9-pin Loctal base
- EL61 – Power pentode, B9G 9-pin Loctal base
- EL70 – Subminiature power pentode, round cross-section envelope, circular 8-pin/wire-ends base
- EL71/5902 – Subminiature 4 W AF power pentode, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EL80/6M5 – 3.9 W AF power pentode; EL41 with a Noval base
- EL81/6CJ6 – CRT horizontal deflection or stabilized power supply series regulator pentode[181]
- EL82/6DY5 = 6П18П↦6P18P – CRT vertical deflection or AF power pentode
- EL83/6CK6 = 6П15П↦6P15P – CRT cathode drive power pentode
- EL84/6BQ5 = M-OV/GEC N709 = 6П14П↦6P14P – 6 W AF power pentode
- EL85/6BN5 – 6 W RF/AF power pentode up to 120 MHz, for use in mobile equipment; EL42 with a Noval base
- EL86/6CW5 = 6П33П↦6P33P – 5.3 W AF or CRT vertical deflection output power pentode; LL86/10CW5, PL84/15CW5[182][183] or XL86/8CW5 with a different heater
- EL88 – 2.6 W AF power pentode
- EL89 – 3.9 W AF power pentode
- EL90/6AQ5 = M-OV/GEC N727 (6П1П↦6P1P, 6005) – 4.5 W AF power pentode
- EL91/6AM5 (M8082) – 4 W AF power pentode
- EL95/6DL5 – 3 W AF power pentode
- EL112 – Radiation-cooled power pentode for 85W SW/VHF service, or for AF amplifiers; EL152 or EL401 with a Y8A steel tube base
- EL136/6FV5 – Horizontal-output power pentode for 110° deflection color TV, Octal base
- EL150 – Power pentode, Y8A steel tube base
- EL151 – 60-Watts AF power pentode, Y10A steel tube 10-pin base
- EL152 – Radiation-cooled power pentode for 85W SW/VHF service, or for AF amplifiers; EL112 or EL401 with a B10V glass 10-pin base with one big pin for the anode; FL152 with a different heater
- EL153 – Radiation-cooled power pentode for 70W SW/VHF service, B10V glass 10-pin base with one big pin for the anode
- EL156 – 50-Watts AF power pentode, Y10A steel tube 10-pin base
- EL171 – 4-Watts Power pentode, gnome tube; UL171 with a different heater
- EL172 – 8-Watts Power pentode, gnome tube
- EL173 – Power pentode, gnome tube, prototype only for TV receivers
- EL180/12BY7 – CRT cathode drive power pentode
- EL183 – CRT cathode drive power pentode
- EL300/6FN5 – CRT horizontal deflection power pentode, Octal base; PL300/35FN5 with a different heater
- EL360 – Power pentode for use in radar scanning, series regulators and pulse modulators, Octal base
- EL401 – Radiation-cooled power pentode for 85W SW/VHF service, or for AF amplifiers; EL112 or EL152 with a B8G Loctal base
- EL500/6GB5 = 6П36С↦6P36S – CRT horizontal deflection output beam power pentode, Magnoval base; LL500/18GB5, PL500/27GB5 or XL500/13GB5 with a different heater
- EL502 – CRT horizontal deflection output power pentode, Magnoval base
- EL503/8278, EL506 – AF power pentode, Magnoval base
- EL504 – CRT horizontal deflection output power pentode, Magnoval base; PL504 with a different heater
- EL505/6KG6 – CRT horizontal deflection output power pentode for color TV, Magnoval base; PL505/40KG6 with a different heater
- EL508/6KW6 – CRT vertical deflection output power pentode for color TV, Magnoval base; PL508/17KW6 with a different heater
- EL509/6KG6A = 6П45С↦6P45S – EL505/6KG6 with an increased max. anode dissipation, Magnoval base; LL509/26KG6A or PL509/40KG6A with a different heater
- EL511 – CRT horizontal deflection output power pentode, Magnoval base
- EL519 – CRT horizontal deflection output power pentode, Magnoval base; PL519 with a different heater
- EL520 – AF beam power tetrode, Magnoval base
- EL802/6LD6 – CRT cathode drive power pentode for color TV, Noval base; PL802 with a different heater
- EL803 – Wideband power pentode
- EL804 – Wideband power pentode
- EL805 – CRT vertical deflection output power pentode; PL805 with a different heater
- EL806 – CRT cathode drive power pentode
- EL820 – Power pentode[184]
- EL821/6CH6 (6132) – CRT cathode drive power pentode for use in high definition television equipment
- EL822 – CRT cathode drive power pentode
- EL844 – 9 W RF power pentode
- EL861 – Long-life 1 W RF power pentode for use as output amplifier in telecomms wide-area transmitters; IL861 with a different heater
- EL862 – Power pentode
- EL863 – Power pentode
- EL803S – Wideband power pentode
- EL3010 – 16.5 W Linear power pentode, center-tapped 12.6 V/1.1 A (series) resp. 6.3 V/2.2 A (parallel) heater, Octal base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- EL5000 – AF power pentode, Magnoval base
- EL5070/8608 – Frame-grid, wideband video power pentode, Magnoval base
- EL8000 – Power pentode, Noval base
- E55L/8233 – Wide-band power pentode for use as CRT vertical deflection electrode driver in oscilloscopes, Magnoval base
- E80L/6227 – 2.8 W AF power pentode, Noval base with gold-plated pins, shock/vibration resistant, long-life >10000h
- E81L/6686 – Long-life 1 W power pentode for use in telephone equipment, Noval base with gold-plated pins, long-life >10000h (no relationship to EL81)
- E84L/7320 – 6 W Power pentode for use in AF amplifiers and stabilized power supplies, Noval base, no cathode interface/poisoning after prolonged periods in cut-off, shock/vibration resistant
- E130L/7534 – Wideband power pentode, Octal base
- E235L/7751 – Wideband power pentode, Octal base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
- E236L – Wideband power pentode, Octal base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant
ELL
- ELL1 – Dual power pentode, side-contact 8 base
- ELL80/6HU8 – Dual AF power pentode, Noval base; PLL80/12HU8 with a different heater
EM
- EM1 (Philips 4678) – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 base
- EM2 – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 base; AM2 with a 6.3 V/200 mA heater, therefore marketed as C/EM2
- EM3 – Top-view, "Magic Eye"-type tuning indicator, side-contact 8 base[185]
- EM4, EM4N – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator; EM34 with a side-contact 8 base
- EM5 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, EM11 or EM35 with a side-contact 8 base
- EM11 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator; EM5 or EM35 with a Y8A steel tube base
- EM31 – Top-view, "Magic Eye"-type tuning indicator, Octal base[186]
- EM34/6CD7 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator; EM4(N) with an Octal base
- EM35 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator; EM5 or EM11 with an Octal base
- Note: Telefunken EM35s appear to have a different pin-out than examples from other manufacturers[187]
- EM71 – Top-view, fan-type tuning indicator with an unusual offset cathode,[188] B8G 8-pin Loctal base; HM71 with a different 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 for AM receivers, Noval B9A 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, Noval B9A base, mainly for stereo use in tape recorders
- EM84/6DH7/6FG6 = 6Е3П↦6Ye3P – Side-view, band-type tuning/level indicator, Noval B9A base
- EM84a – Improved EM84 with twice the sensitivity[189]
- EM85 – Side-view, fan-type tuning indicator; HM85 or UM85 with a different heater
- EM85E – Band-type drop-in replacement for EM85[190]
- EM87/6HU6 (CV10407) – Side-view, band-type tuning/level indicator, Noval B9A base
- EM171 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, gnome tube;[191] UM171 with a different heater
- EM800 – Side-view, bar graph-type tuning/level indicator, Noval B9A base
- EM840 – Side-view, band-type tuning/level indicator, Noval B9A base
- E82M – Side-view, rectangle-type dual-channel level indicator, two DC amplifier triodes control separate deflection rods before a 17 × 20 mm screen anode, Noval B9A base
EMM
- EMM801 – Side-view, dual, band-type indicator with brightness control, for voltage comparison, Noval B9A base
- EMM803 – Side-view, dual, band-type tuning indicator for FM-stereo receivers (field strength, 19kHz pilot present), Noval B9A base
EN
- EN31 – 10 mAavg, 750 mApeak, Helium-filled, indirectly heated triode thyratron for high-frequency timebases and control equipment, Octal base with anode cap
- EN32/6574 – 300 mAavg, 2 Apeak, 10 Asurge, Gas-filled, indirectly heated tetrode thyratron with negative control characteristic, for industrial control applications, Octal base
- EN70 – 20 mAavg, 100 mApeak, Subminiature, gas-filled, indirectly heated tetrode thyratron with negative control characteristic, all-glass round cross-section envelope, circular 8-pin/wire-ends base
- EN91/2D21 (CV797, Philips PL21, PL2D21) – 100 mAavg, 500 mApeak, 10 Asurge, Gas-filled, indirectly heated tetrode thyratron, negative starter voltage, Miniature 7-pin base, for relay and grid-controlled rectifier service
- EN92 (5696) – 25 mAavg, 100 mApeak, 2 Asurge, Gas-filled, indirectly heated tetrode thyratron, negative starter voltage, Miniature 7-pin base, for industrial control
EQ
- EQ40 – Nonode for FM quadrature detection, Rimlock base
- EQ80/6BE7 – Nonode for FM quadrature detection or as phase detector in TV flywheel sync circuits[192]
- EQ171 – Nonode, gnome tube, prototype only; UQ171 with a different heater
ES
- 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.[193][194][195][196] Y8A steel tube base with 2 unused pins, screen grid on top cap; compare US111
ET
- ET51 – Trochotron, an electron beam decade counter tube
- E1T/6370 – Trochotron with side-viewing, fluorescent-screen readout, Duodecal (12-pin) base
- E80T/6218 (CV5724) – Modulated, single-anode beam deflection tube for pulse generation up to 375 MHz, Noval base, shock resistant up to 500 g[101][100][102][103]
EW
EY
- EY1 – Half-indirectly heated CRT EHT rectifier; 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, 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 different heater
- EY81/6R3 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; PY81/17Z3 with a different heater
- EY82/6N3 – 850 V, 180 mA Half-wave rectifier; PY82/19Y3 with a different heater
- EY83 – 5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; PY83 with a different heater
- EY84/6374 – 2 kV, 150 mA Half-wave rectifier for operation at high altitudes
- EY86/6S2, EY806 – 24 kV, 800 µA Half-indirectly heated CRT EHT rectifier, anode on top cap; DY86/1S2 or GY86 with a different heater
- EY87/6S2A, EY807 – DY87/1S2A with a different heater; EY86 with a silicone-coated envelope to avoid flush-over in high-humidity and low atmospheric-pressure conditions
- EY88/6AL3 = 6Д20П↦6D20P – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; LY88/20AQ3, PY88/30AE3 or XY88/16AQ3 with a different heater
- EY91 – 250 V, 75 mA Half-wave rectifier, Miniature 7-pin base
- EY189 – Rectifier, Noval base
- EY500/6EC4 – 5.6 kV, 440 mA CRT horizontal deflection output booster/damper/efficiency diode for color TV, Magnoval base, cathode on top cap, guardian shield between filament and cathode to improve high voltage properties; PY500/42EC4 with a different 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 different heater
- EY3000, EY3000N – 800 V, 750 mA Half-wave rectifier, side-contact 8 base with anode on top cap
EYY
- EYY13 – Dual 1.55 kV, 250 mA rectifier with separate cathodes, Y8A steel tube base, for use as a voltage doubler
EZ
- EZ1 – 250 V, 50 mA Full-wave rectifier for 6V car radios, side-contact 8 base; FZ1 with a different heater
- EZ2 – 1 kV, 2×30 mA Full-wave rectifier, side-contact 8 base
- EZ3, EZ3N – 1.2 kV, 2×50 mA Full-wave rectifier, side-contact 8 base
- EZ4 – 1.2 kV, 2×88 mA Full-wave rectifier, side-contact 8 base
- EZ11 – 700 V, 2×30 mA Full-wave rectifier for vehicle equipment, Y8A steel tube base
- EZ12 – 1.4 kV, 2×50 mA Full-wave rectifier, Y8A steel tube base
- EZ22 – 1.3 kV, 2×50 mA Full-wave rectifier, B8G Loctal base
- EZ30/6CF4 – Full-wave rectifier, Octal base
- EZ35/6X5 = 6Ц5С↦6C5S – 925 V, 2×35 mA Full-wave rectifier, Octal base
- EZ40/6BT4 – 780 V, 2×45 mA Full-wave rectifier, Rimlock base; GZ40 with a different heater
- EZ41 – 700 V, 2×30 mA Full-wave rectifier, Rimlock base
- EZ80/6V4 – 1 kV, 2×45 mA Full-wave rectifier, Noval base
- EZ81/6CA4 – 1 kV, 2×450 mA Full-wave rectifier
- EZ82 – EZ80/6V4 with the diodes vertically stacked instead of side-by-side
- EZ90/6X4 = 6Ц4П↦6C4P – 925 V, 2×35 mA Full-wave rectifier, Miniature 7-pin base
- EZ91/6AV4 – 1 kV, 2×45 mA Full-wave rectifier, Miniature 7-pin base
- EZ150 – Dual 1.7 kV, 560 mA rectifier with separate cathodes, Y10A steel tube 10-pin base, for use as a voltage doubler
- EZ900/6063 – Full-wave rectifier, Miniature 7-pin base[197]
- E90Z/6063 – 925 V, 2×35 mA Full-wave rectifier, Miniature 7-pin base, shock/vibration resistant
F - 12.6 V heater
FDD
- FDD20 – Common cathode dual power triode, 12.6 V/350 mA heater, side-contact 8 base - available with two different pinouts;[198] similar to 53, 6A6, 6N7G
FL
- FL152 – EL152 with a different heater
FZ
- FZ1 – 250 V, 50 mA Full-wave rectifier for 12V car radios, side-contact 8 base; EZ1 with a different heater
G - 5.0 V heater or misc.
GA
- GA560 – Directly heated, thermally-limited (=saturated) emission, vacuum noise diode, 2.5 to 3.5 V/1.9 to 2.2 A uncoated, thorium-free tungsten filament, all-glass, 3-pin base
- GA8600 – Directly heated, thermally-limited emission diode, 1.9 V/1.55 A filament, all-glass, Noval base
GY
- GY11 – 2 kV, 100 mA Half-wave rectifier, 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 Half-indirectly heated CRT EHT rectifier for color TV, 3.15 V/400 mA heater, Magnoval base with anode on top cap
- GY521 – CRT EHT rectifier, Magnoval base with anode on top cap
- GY802 – Half-indirectly heated CRT EHT rectifier, silicone-coated envelope to avoid 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
GZ
These tubes all have a 5.0 V heater
- GZ30/5Z4G = 5Ц4С↦5C4S – 1.4 kV, 2×68 mA Full-wave rectifier, Octal base
- GZ31/5U4G = 5Ц3С↦5C3S – 1.55 kV, 2×675 mA Full-wave rectifier, 5-pin Octal base
- GZ32/5V4/5AQ4 – 1.4 kV, 2×125 mA Full-wave rectifier, Octal base
- GZ33 – 1.4 kV, 2×375 mA Full-wave rectifier, Octal base
- GZ34/5AR4 – 1.7 kV, 2×825 mA Full-wave rectifier, Octal base
- GZ37 – 1.6 kV, 2×125 mA Full-wave rectifier, Octal base
- GZ40 – 1 kV, 2×45 mA Full-wave rectifier, Rimlock base; EZ40 with a different heater
- GZ41 – 1.25 kV, 2×35 mA Full-wave rectifier, Rimlock base
H - 150 mA heater
HAA
- HAA91/12AL5 – Dual diode with separate cathodes, Miniature 7-pin base; EAA91/6AL5, UAA91 or XAA91/3AL5 with a different heater
HABC
- HABC80/19T8 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war AM/FM radios; 5T8, 6T8, EABC80/6AK8, PABC80/9AK8 or UABC80/27AK8 with a different heater
HBC
- HBC90/12AT6 – High-μ triode + common cathode dual diode, Miniature 7-pin base; EBC90/6AT6 with a different heater
- HBC91/12AV6 – High-μ AF triode + common cathode dual diode, for use in FM ratio detectors, Miniature 7-pin base; EBC91/6AV6 with a different heater
HCC
- HCC85/17EW8 – Dual triode for use as VHF mixer up to 200 MHz, Noval base; ECC85/6AQ8, PCC85/9AQ8 or UCC85 with a different heater
HCH
- HCH81/12AJ7 – Triode/remote-cutoff heptode mixer, Noval base; UCH81/19D8 with a different heater
HF
- HF85 – Remote-cutoff wideband RF pentode, Noval base; EF85/6BY7 or XF85 with a different heater
- HF93/12BA6 – Remote-cutoff pentode, Miniature 7-pin base; EF93/6BA6 with a different heater
- HF94/12AU6 – Sharp-cutoff RF/IF/AF pentode, Miniature 7-pin base; EF94/6AU6 or XF94/3AU6 with a different heater
HK
- HK90/12BE6 – Heptode pentagrid converter, Miniature 7-pin; EK90/6BE6 with a different heater
HL
- HL84 – AF power pentode, Noval base; UL84 with a different heater
- HL90/12AQ5 – AF power pentode, Miniature 7-pin; EL90 with a different heater
- HL92/50C5 – AF beam power pentode, Miniature 7-pin
- HL94/30A5 – AF power pentode, Miniature 7-pin
HM
- HM34 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator; EM34 with different heater ratings; UM4 with different base and heater ratings
- HM71 – Top-view, fan-type tuning indicator, B8G Loctal base; EM71 with a different heater
- HM85 – Side-view, fan-type tuning indicator, Noval base; EM85 or UM85 with a different heater
HY
- HY90/35W4 – 330 V, 100 mA Half-wave rectifier with a heater tap for a pilot lamp, Miniature 7-pin
I - 20 V heater
IF
- IF860 – Long-life sharp-cutoff RF pentode for use as preamplifier in telecomms wide-area receivers; EF860 with a 95 mA heater
IL
- IL861 – Long-life RF power pentode for use as output amplifier in telecomms wide-area transmitters; EL861 with a 120 mA heater
K - 2.0 V heater
KA
- KA560 (6357) – Gas-filled, directly heated noise diode for the 10 cm band, waveguide output, BA15d lamp base with anode on top cap
- KA561 (6356) – Gas-filled, directly heated noise diode for the 7.5 cm band, waveguide output, BA15d lamp base with anode on top cap
- KA562 (6358) – Gas-filled, directly heated noise diode for the 3 cm band, waveguide output, BA15d lamp base with anode on top cap
- KA563 (6359) – Gas-filled, directly heated noise diode for the 1.25 cm band, waveguide output, BA15d lamp base with anode on top cap
- K50A (6358) – Neon-filled, directly heated noise diode for the 3 cm band, waveguide output, BA15d lamp base with anode on top cap
- K51A – Neon-filled, directly heated noise diode for the 10 cm band, waveguide output, BA15d lamp base with anode on top cap
- K81A – Directly heated, thermally-limited (=saturated) emission, vacuum VHF noise diode, 2.5 Amax uncoated tungsten filament, Noval base
KB
- KB1 – Directly heated dual diode with common cathode, poor performance as an AM detector lead to the introduction of the KB2; see introduction
- KB2 – Indirectly heated dual diode with common cathode, side-contact 5 base
KBC
- KBC1 – Dual diode + triode, side-contact 8 base with triode grid on top cap
- KBC32 – Dual diode + triode, Octal base
KC
- KC1 – Triode, side-contact 8 base
- KC3 – Triode, side-contact 8 base
- KC4 – Triode, side-contact 8 base
- KC50 – Triode for use in hearing aids, B4B 4-pin subminiature base;[199] cf. M-OV/GEC H11, H12, Mullard DA1
- KC51 – Triode, B4B 4-pin subminiature base;[200] cf. DC51
KCF
- KCF30 – Triode + remote-cutoff pentode, oscillator/mixer, Octal base with control grid on top cap
KCH
- KCH1 – Triode/hexode mixer, side-contact 8 base with hexode control #1 grid on top cap
KD
- KD50 – Power triode for use in hearing aids, B4B 4-pin subminiature base;[201] cf. DD51, M-OV/GEC L11, L12, Mullard DA2, DA3
KDD
- KDD1 – 1.5 W Dual power triode, side-contact 8 base
KE
- KE50 – Tetrode for use in hearing aids, B4B 4-pin subminiature base with anode on top cap;[202] cf. DF51, M-OV/GEC S12, Mullard DAS1
KF
- KF1 – RF/IF Pentode, European 7-pin base with anode on top cap
- KF2 – Remote-cutoff RF/IF pentode, European 7-pin base with anode on top cap
- KF3 – Remote-cutoff RF/IF pentode, side-contact 8 base with control grid on top cap
- KF3G – KF3 with an Octal base
- KF4 – RF/IF Pentode, side-contact 8 base with control grid on top cap
- KF7 – RF/IF Pentode, side-contact 8 base with anode on top cap[134]
- KF8 – Remote-cutoff RF/IF pentode, side-contact 8 base with anode on top cap[134]
- KF35 – Remote-cutoff RF pentode, Octal base with control grid on top cap
KH
- KH1 – Hexode pentagrid converter, side-contact 8 base with #1 grid on top cap
KK
- KK1 – Octode pentagrid converter, side-contact 8 base with #4 grid on top cap[203]
- KK2 – Remote-cutoff octode pentagrid converter with #4 grid on top cap; KK32 with a side-contact 8 base
- KK2G – KK2 with an Octal base
- KK32 = KK2G
KL
- KL1 – Power pentode, O5A European 5-pin base
- KL2 – Power pentode, side-contact 8 base
- KL4 – Power pentode, side-contact 8 base
- KL4G – KL4 with an Octal base
- KL5 – Power pentode, side-contact 8 base
- KL35 – 340 mW Power pentode, Octal base
KLL
- KLL3 – Dual power pentode, side-contact 8 base[204]
- KLL32 – 1.2W Dual power pentode, Octal base
KY
- KY50/2L2 = EdiSwan U25 – CRT EHT rectifier, all-glass wire-ended
- KY80/2J2 = EdiSwan U26 – CRT EHT rectifier, Noval base
L - 450 mA heater
LC
- LC900/3HA5 – Frame-grid vari-μ VHF triode; EC900/6HA5, PC900/4HA5 or XC900/2HA5 with a different heater
LCF
- LCF80/6LN8 – VHF oscillator/mixer triode/pentode; ECF80/6BL8, PCF80/9A8, UCF80 or XCF80/4BL8 with a different heater[205]
- LCF86/5HG8 – VHF oscillator/mixer triode/pentode; ECF86/6HG8, PCF86/7HG8, 8HG8 or XCF86/4HG8 with a different heater[206]
- LCF200/5X9 – Triode + pentode for use as IF amplifier in TV receivers, Decal base; ECF200/6X9 or PCF200/8X9 with a different heater
- LCF201/5U9 – Triode + pentode for use as IF amplifier and sync sep in TV receivers, Decal base; ECF201/6U9 or PCF201/8U9 with a different heater[207]
- LCF801/5GJ7 – Frame-grid triode + sharp-cutoff pentode for use as VHF mixer in TV receivers, Noval base; ECF801/6GJ7, PCF801/8GJ7 or XCF801/4GJ7 with a different heater[208]
- LCF802/6LX8 – Medium-μ triode + sharp-cutoff pentode for use as reactance and sinewave oscillator in TV receivers, Noval base; ECF802/6JW8, PCF802/9JW8 or 5JW8 with a different heater[209]
LCL
- LCL82/11BM8 – AF triode + AF power pentode; ECL82/6BM8, PCL82/16A8, UCL82/50BM8 or XCL82/8B8 with a different heater
- LCL84/10DX8 – TV sync sep triode + sharp-cutoff CRT cathode drive power pentode; ECL84/6DX8, PCL84/15DQ8 or XCL84/8DX8 with a different heater[210]
- LCL85/10GV8 – Triode + power pentode used in TV receivers for vertical timebase, generally as a multivibrator, with the pentode section doubling as one half of the multivibrator and the power output device; ECL85/6GV8, PCL85/18GV8 or XCL85/9GV8 with an 11.6 V heater[211]
LF
- LF183/YF183/4EH7 – Frame-grid, remote-cutoff IF pentode for use in TV receivers; EF183/6EH7 or XF183/3EH7 with a different heater[169][212]
- LF184/YF184/4EJ7 – Frame-grid, sharp-cutoff IF pentode for use in TV receivers; EF184/6EJ7 or XF184/3EJ7 with a different heater[170][213]
LFL
- LFL200/11Y9 – Sync sep pentode + CRT cathode drive power pentode, Decal base; EFL200/6Y9 or PFL200/16Y9 with a different heater[214]
LL
- LL86/10CW5 – AF or CRT vertical deflection output power pentode; EL86/6CW5, PL84/15CW5[182][183] or XL86/8CW5 with a different heater
- LL500/18GB5 – CRT horizontal deflection beam power pentode, Magnoval base; EL500/6GB5, PL500/27GB5 or XL500/13GB5 with a different heater[215]
- LL509/26KG6A – EL509/6KG6A or PL509/40KG6A with a different heater
- LL521/21KQ6 – CRT horizontal deflection output power pentode, Magnoval base; PL521/29KQ6 with a different heater
LY
- LY88/20AQ3 – CRT horizontal deflection output booster/damper/efficiency diode; EY88/6AL3, PY88/30AE3 or XY88/16AQ3 with a different heater[216]
M - 1.9 V heater
Note: Marconi preceded the M-P designation with the letter M, as in MEBC3 for EBC3
MC
MF
N - 12.6 V heater
ND
- ND4 – 600 MHz, 10 W VHF power triode[222]
NF
- NF2 – Sharp-cutoff RF pentode;[223][218] AF7 or CF7 with a different heater; also produced by JRC in the then-axis power of Japan[224]
- NF3 – Remote-cutoff RF pentode;[225][218] CF2 with a different heater
- NF4 = RV12P4000 – RF pentode[226][218]
- NF6 = RV12P2000 – RF pentode[227][219] also produced by JRC in Japan[224]
O - No heater
Notes:
- The semiconductors had a different function letter scheme[31]
- 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.
- Philips sold a family of 150mA series heater tubes under this letter in South America: OBC1, OBC3/12SQ7GT, OBF2, OCH4, OH4/12A8GT, OF1/6S7G, OF5/12K7GT, OF9 and OM5, used in combination with RETMA types 35Z5 and 50L6[228]
OA
- OA5 – 100 V, 150 mA Germanium gold-bonded point-contact diode
- OA85 – 90 V, 50 mA Germanium point-contact diode
- OA127 – 19 V, 40 mA Silicon diode
- OA214 – 700 V, 500 mA Silicon diode
- OA262 – 200 V, 15 A Silicon diode
- OA1154Q – Quad germanium point-contact diode
- OA1182 – 80 V, 150 mA Germanium diode
OAP
- OAP12 – Germanium photodiode, all-glass wire-ended, black-tinted except top dome, max. sensitivity at λ = 1.55 µm
OAZ
- OAZ200 – 4.7 V, 420 mW Silicon zener diode
- OAZ292 – 9.1 V, 7 W Silicon zener diode
OC
- OC2 – Germanium PNP bipolar junction transistor, β > 20
- OC43 – 15 V, 50 mA Germanium PNP transistor, β: 50...200
- OC44 – 15 V, 5 mA Germanium PNP transistor, β: 100
- OC45 – 15 V, 5 mA Germanium PNP transistor, β: 50
- OC46 – 20 V, 100 mA Germanium PNP transistor, β: 20...80
- OC47 – 20 V, 100 mA Germanium PNP transistor, β: 50...200
- Note: 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[229]
- OC50 – 20 V, 1.5 mA Germanium PNP point-contact transistor, β: 2.1
- OC70 – 30 V, 10 mA Germanium PNP transistor, black-tinted all-glass wire-ended, β: 30
- OC71 – 30 V, 10 mA Germanium PNP transistor, black-tinted all-glass wire-ended, β: 47
- OC141 – 20 V, 400 mA Germanium NPN transistor, β: 150
- OC170 – 20 V, 10 mA Germanium NPN transistor, β: 100
- OC200 – 25 V, 50 mA Silicon NPN transistor, β: 15...60
- OC430 – 10 V, 50 mA Silicon PNP transistor, β: 10...20
- OC440 – 30 V, 50 mA Silicon PNP transistor, β: 10...20
- OC450 – 75 V, 50 mA Silicon PNP transistor, β: >10
- OC460 – 10 V, 50 mA Silicon PNP transistor, β: >20
- OC470 – 30 V, 50 mA Silicon PNP transistor, β: >20
- OC604 – 10 V, 50 mA Germanium PNP AF transistor, black-tinted all-glass wire-ended, β: 45
- OC604spez. – 15 V, 500 mA Germanium PNP AF power transistor, OC604 with improved internal heat transfer and a cooling fin
- OC703 – 80 V, 50 mA Silicon PNP transistor, β: 10...25
- OC800 – 50 V, 10 mA Silicon FET (Clevite-Intermetall), μ: 4.5, gm: 50 µ℧
OCP
- OCP70 – Germanium PNP phototransistor, OC70 without black tint, max. sensitivity at λ = 1.55 µm
- OCP71 – Germanium PNP phototransistor, OC71 without black tint, max. sensitivity at λ = 1.55 µm
OD
- OD650 – 60 V, 15 A, 45 W Germanium AF PNP power transistor, β: 80
- OD652 – 60 V, 30 A, 45 W Germanium AF PNP power transistor, β: 50
- OD750 – 100 V, 2 A, 150 W Silicon AF NPN power transistor, β: 30
- OD751 – 100 V, 5 A, 150 W Silicon AF NPN power transistor, β: 30
ORP
The RPY numbers are the equivalent under the later Pro Electron semiconductor designation system
- ORP10/7632 – InSb mid-infrared photoresistor, top window, 2-pin wire-ended, max. sensitivity at λ = 6 µm
- ORP11/7633 – CdS photoresistor (LDR), top window, 3-pin base, max. sensitivity at λ = 675 nm
- ORP12/LDR03 – CdS photoresistor, top window, 2-pin wire-ended, max. sensitivity at λ = 675 nm
- ORP13 – InSb mid-infrared photoresistor in a liquid nitrogen dewar, side window via mirror, max. sensitivity at λ = 4.5...5.4 µm
- ORP14/RPY14, ORP17 – CdS photoresistor, side window, 2-pin gold-plated wire-ended, max. sensitivity at λ = 675 nm
- ORP23 – CdS photoresistor, top window, 2-pin base, max. sensitivity at λ = 675 nm
- ORP30 – 350 Vmax CdS photoresistor, top window, 4-pin Octal base, max. sensitivity at λ = 675 nm
- ORP31 – 350 Vmax CdS photoresistor, top window, 4-pin Octal base
- ORP50 (300 Vmax), ORP52 (200 Vmax) – CdS photoresistor 45° tilt under dome, all-glass with 2 wire-ends, max. sensitivity at λ = 675 nm
- ORP60, ORP66 (top window), ORP61 (side window) – 350 Vmax CdS photoresistor, all-glass with 2 wire-ends, max. sensitivity at λ = 675 nm
- ORP62 (side window), ORP68, ORP69 (45° tilt) – 350 Vmax CdS photoresistor, all-glass with 2 wire-ends, max. sensitivity at λ = 675 nm
- ORP63 – 75 Vmax CdS photoresistor, side window, all-glass with 2 wire-ends, max. sensitivity at λ = 675 nm
- ORP80/RPY13 – Vactrol-type opto-isolator, a small 24 V/60 mA incandescent lamp surrounded by four 200 Vmax CdS photoresistors in a black-tinted glass envelope, Noval base[230]
- ORP90, ORP93, ORP94 – 350 Vmax CdS photoresistor, side window, Miniature 7-pin base, max. sensitivity at λ = 675 nm
OY
- OY2 – 100 V, 200 mA Germanium half-wave rectifier
- OY114 – 200 V, 1 A Germanium half-wave rectifier
- OY252 – 200 V, 500 mA Silicon half-wave rectifier
- OY5066 – 600 V, 10 A Silicon half-wave rectifier
- OY6047 – 700 V, 1 A Silicon half-wave rectifier
P - 300 mA heater
Note: Philips sold a family of 300mA series heater tubes under this letter in South America: PAB1, PBC3/6SQ7GT, PBF2/6B8G, PF9/6K7G, PH4/6A8G and PM5, used in combination with RETMA types 25L6 and 25Z6[228]
PAB
- PAB1 – Triple diode with common cathode, side-contact 8 base; AAB1 or EAB1 with a different heater
PABC
- PABC80/9AK8 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war European AM/FM radios and TV receivers; EABC80/6AK8, 5T8, 6T8, HABC80/19T8, UABC80/27AK8 or DH719 with a different heater
PC
- PC86/4CM4 – Frame-grid UHF triode; EC86/6CM4 with a different heater
- PC88/4DL4 – Frame-grid UHF triode; EC88/6DL4 with a different heater
- PC92 – RF Triode
- PC93 – Triode
- PC95/4ER5 – Vari-μ VHF triode; EC95/6ER5 or XC95/2ER5 with a different heater
- PC96 – Triode
- PC97/4FY5 – Frame-grid vari-μ VHF triode; EC97/6FY5 or XC97/2FY5 with a different heater
- PC900/4HA5 – Frame-grid vari-μ VHF triode; EC900/6HA5, LC900/3HA5 or XC900/2HA5 with a different heater
PCC
- PCC84/7AN7 – Dual triode for use as VHF cascode amplifier, Noval base; ECC84/6CW7 or UCC84 with a different heater
- PCC85/9AQ8 – Dual triode for use as VHF oscillator/mixer up to 200 MHz, Noval base; ECC85/6AQ8, HCC85/17EW8 or UCC85 with a different heater
- PCC88/7DJ8 – Dual frame-grid VHF triode for use as cascode amplifier; ECC88/6DJ8 with a different heater
- PCC89/7FC7 – Dual vari-μ frame-grid VHF triode for use as cascode amplifier up to 220 MHz
- PCC189/7ES8 – Dual vari-μ frame-grid VHF triode for cascode amplifier; ECC189/6ES8, XCC189/4ES8 or YCC189/5ES8 with a different heater
- PCC806 – Dual vari-μ frame-grid VHF triode for use as cascode amplifier[44]
PCE
- PCE82 – Triode + CRT cathode drive beam tetrode
- PCE800 = EdiSwan 30FL1 – Triode + low-power semiremote-cutoff beam tetrode, Noval base
PCF
- PCF80/9A8 = 9Ф8П↦9F8P – VHF oscillator/mixer triode/pentode; ECF80/6BL8, LCF80/6LN8, UCF80 or XCF80/4BL8 with a different heater
- PCF82/9U8A – ECF82/6U8 or XCF82/5U8 with a different heater
- PCF84 – Triode + pentode
- PCF86/7HG8 – VHF oscillator/mixer frame-grid triode/pentode; ECF86/6HG8, LCF86/5HG8, 8HG8 or XCF86/4HG8 with a different heater
- PCF87 = EdiSwan 30C17 – Frame-grid triode + remote-cutoff pentode for use as VHF mixer in TV receivers[231]
- PCF200/8X9 – Triode + pentode for use as IF amplifier in TV receivers, Decal base; ECF200/6X9 or LCF200/5X9 with a different heater
- PCF201/8U9 – Triode + pentode for use as IF amplifier and sync sep in TV receivers, Decal base; ECF201/6U9 or LCF201/5U9 with a different heater
- PCF800 (EdiSwan 30C15) – Frame-grid triode + pentode for use as VHF mixer in TV receivers
- PCF801/8GJ7 – Frame-grid triode + remote-cutoff pentode for use as VHF mixer in TV receivers, Noval base; ECF801/6GJ7, LCF801/5GJ7 or XCF801/4GJ7 with a different heater
- PCF802/9JW8 – Triode + pentode for use as reactance and sinewave oscillator in TV receivers, Noval base; ECF802/6JW8, LCF802/6LX8 or 5JW8 with a different heater
- PCF803 – PCF801/8GJ7 with separate cathodes
- PCF805/7GV7 – Frame-grid triode + remote-cutoff pentode for use as VHF mixer in TV receivers, Noval base; ECF805/6GV7 with a different heater
- PCF806 – Triode + sharp-cutoff frame-grid pentode for use as VHF mixer in TV receivers
- PCF808 – Triode + pentode for use as RF amplifier and scanning oscillator in TV receivers, Noval base[44]
- PCF810 – Triode + pentode
- PCF812 = EdiSwan 30FL2 – Triode + low-power semiremote-cutoff beam tetrode, Noval base;[165] ECF812 (=6FL2) with a different heater
PCH
- PCH200/9V9 – Triode/heptode, Decal base, for TV sync sep; ECH200/6V9 with a different heater
PCL
- PCL81 – ECL81 with a different heater
- PCL82/16A8 = 16Ф3П↦16F3P – AF triode + AF power pentode; ECL82/6BM8, LCL82/11BM8, UCL82/50BM8 or XCL82/8B8 with a different heater
- PCL83 – Triode + power pentode; ECL83 with a different heater
- PCL84/15DQ8 = 15Ф4П↦15F4P – TV sync sep triode + CRT cathode drive power pentode; ECL84/6DX8 or LCL84/10DX8 or XCL84/8DX8 with a different heater
- PCL85/18GV8 = 18Ф5П↦18F5P – Triode + power pentode used in TV receivers for vertical timebase, generally as a multivibrator, with the pentode section doubling as one half of the multivibrator and the power output device; ECL85/6GV8, LCL85/10GV8 or XCL85/9GV8 with a different heater
- PCL86/14GW8 – AF Triode + AF power pentode, used for audio amplification in European TV receivers; ECL86/6GW8 with a different heater
- PCL88 = EdiSwan 30PL14 – Triode + power pentode[232]
- PCL200 – Triode + CRT drive power pentode, Decal base; ECL200 with a different heater
- PCL501 – Triode + power pentode, Magnoval base
- PCL800 = EdiSwan 30PL13 – Triode + power pentode[233]
- PCL802 – Triode + power pentode
- PCL805 – Triode + power pentode; ECL805 with a different heater
PD
- 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 different heater
- PD510 – PD500 with a higher PbO content in the glass, improving the X-radiation screening,[67] and therefore should never be replaced by a PD500 in equipment designed for the PD510[234]
PF
- PF83 – Remote-cutoff AF pentode for use as a VCA in remotely controllable TV receivers
- PF86 – Sharp-cutoff AF pentode, also for use in Transitron circuits in TV receivers; EF86/6BK8/6CF8 or UF86 with a different heater
PFL
- PFL200/16Y9 – Sync sep pentode + CRT cathode drive power pentode, Decal base; EFL200/6Y9 or LFL200/11Y9 with a 17 V heater
PL
- PL11 – Power pentode, Y8A steel tube base
- PL33 – CRT vertical deflection or AF power pentode, Octal base
- PL36/25E5 – British high voltage high frequency switching pentode valve, Octal base with anode on top cap. Used in TV receivers for horizontal deflection output and/or EHT generation up to c1964. Last consumer electronics use DECCA series DR101, 202, 303, 404, 505, 606 monochrome receivers
- PL38 – CRT horizontal deflection output power pentode, Octal base; EL38/6CN6 with a different heater
- PL38M – PL38 with a metal particles spray-shielded envelope on a separate pin[235]
- PL81/21A6 – AF or CRT horizontal deflection output power pentode, Noval base
- PL81A – Similar to PL81 but optimised for portable television designs
- PL82/16A5 – AF or CRT vertical deflection output power pentode
- PL83/15A6 = M-OV/GEC N309 – CRT cathode drive power pentode
- PL84/15CW5 – AF or CRT vertical deflection output power pentode; EL86/6CW5,[182] LL86/10CW5 or XL86/8CW5[183] with a different heater
- PL95 – AF power pentode
- PL136/35FV5 – Color TV 110° horizontal deflection output power pentode, Octal base
- PL300/35FN5 – CRT horizontal deflection power pentode, Octal base; EL300/6FN5 with a different heater
- PL302 – CRT horizontal deflection beam power pentode, Octal base
- PL500/27GB5/28GB5 – CRT horizontal deflection beam power pentode, Magnoval base; EL500/6GB5, LL500/18GB5 or XL500/13GB5 with a different heater
- PL502 – CRT horizontal deflection output power pentode
- PL504 – CRT horizontal deflection output power pentode, replacement for PL500; EL504 with a different heater
- PL505/40KG6 – CRT horizontal deflection output power pentode for color TV; EL505/6KG6 with a different heater
- PL508/17KW6 – CRT vertical deflection output power pentode for color TV; EL508/6KW6 with a different heater
- PL509/40KG6A – PL505/40KG6 with an increased max. anode dissipation; EL509/6KG6A or LL509/26KG6A with a different heater
- PL511 – CRT horizontal deflection output power pentode
- PL519 – CRT horizontal deflection output power pentode; EL519 with a different heater
- PL521/29KQ6 – CRT horizontal deflection output power pentode, Magnoval base; LL521/21KQ6 with a different heater
- PL802 – CRT cathode drive output pentode for color TV, Noval base; EL802/6LD6 with a different heater
- PL805 – CRT vertical deflection output power pentode; EL805 with a different heater
- PL820 – CRT horizontal deflection output power pentode[235]
- PL841 – AF or CRT vertical deflection output power pentode
PLL
- PLL80/12HU8 – Dual AF power pentode, Noval base; ELL80/6HU8 with a different heater
PM
- PM84 – Side-view, band-type tuning/level indicator for use in TV receivers, Noval base; UM84/12FG6 with a different heater
PY
- PY31 – 1 kV, 125 mA Half-wave rectifier, Octal base
- PY32 – 700 V, 325 mA Half-wave rectifier, Octal base
- PY33 – 700 V, 325 mA Half-wave rectifier, Octal base
- PY71 – Half-wave rectifier, B8G Loctal base
- PY80/19X3 – CRT horizontal deflection output booster/damper/efficiency diode, Noval base; EY80 with a different heater
- PY81/17Z3 – 4.5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; EY81/6R3 with a different heater
- PY82/19Y3 – 700 V, 180 mA Half-wave rectifier; EY82/6N3 with a different heater
- PY83 – 5 kV, 150 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; EY83 with a different heater
- PY88/30AE3 – 6 kV, 220 mA CRT horizontal deflection output booster/damper/efficiency diode, cathode on top cap; EY88/6AL3, LY88/20AQ3 or XY88/16AQ3 with a different heater
- PY500/42EC4 – 5.6 kV, 440 mA CRT horizontal deflection output booster/damper/efficiency diode for color TV, Magnoval base, cathode on top cap, guardian shield between filament and cathode to improve high voltage properties; EY500/6EC4 with a different 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, Noval base with cathode on top cap
- PY801 – 5.5 kV, 175 mA CRT horizontal deflection output booster/damper/efficiency diode, Noval base with cathode on top cap[236]
PZ
- PZ30 – Dual 200 mA rectifier with separate cathodes, center-tapped 52 V/300 mA (series) resp. 26 V/600 mA (parallel) heater, Octal base, for use as a voltage doubler in TV receivers
Q - 2.4 V heater
QC
- QC100 – Low-microphonics triode[237]
QZ
- QZ100 – Full-wave rectifier[238]
Further types such as the QD100, QF100,[239] QH100, QLL100, QY100 were under development, but didn't get past the prototyping phase[240]
S - 1.9 V heater
SA
- SA100 – Instrumentation rectifier diode up to 3 GHz[241]
- SA101 – Instrumentation rectifier diode[242]
- SA102 – Instrumentation rectifier diode[243]
SD
SF
- SF1A – Sharp-cutoff RF pentode;[246] NF6 resp. RV12P2000 with a different heater
T - Custom heater
Note: Tungsram preceded the M-P designation with the letter T, as in TAD1 for AD1
TY
- TY86F – 7.4 V/77 mA heater version of the EY86 18-kV CRT EHT rectifier,[235] for use as a hotfix in early-production Ferguson Radio Corporation TV receivers 306T and 308T[247] where the horizontal-output transformer produced excessive heater voltage which destroyed the originally fitted EY86's
U - 100 mA heater
Notes:
- Ultron (MBLE)(fr, nl) preceded the M-P designation with the letter U, as in UAD1 for AD1
- Philips sold a family of 100mA series heater tubes under this letter in South America: UBC1, UBF2, UBL1, UCH4, UF8, UF9, UL1, UM4 and UY1[228]
U<none>
- 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
UAA
- UAA11 – Dual diode with separate cathodes, Y8A steel tube base
- UAA91 – Dual diode with separate cathodes, Miniature 7-pin base; EAA91/6AL5, HAA91/12AL5 or XAA91/3AL5 with a different heater
- UAA171 – Dual diode, separate cathodes and separate heaters, gnome tube; EAA171 with a different heater
UABC
- UABC80/27AK8 – Triple diode + high-μ triode on common cathode with two of the diodes, Noval base, triode μ = 70, used as AM detector/AVC rectifier/FM ratio detector/AF amplifier in series-heated post-war European AM/FM radios; EABC80/6AK8, 5T8, 6T8, HABC80/19T8, PABC80/9AK8 and DH719 with a different heater
UAF
- UAF21 – Diode + remote-cutoff RF/IF/AF pentode, B8G Loctal base; EAF21 with a different heater
- UAF41 – Diode + remote-cutoff RF/IF/AF pentode, Rimlock base; EAF41 with a different heater
- UAF42/12S7 – Diode + remote-cutoff RF/IF/AF pentode, Rimlock base
UB
- UB41 – Dual RF diode with separate cathodes, Rimlock base; EB41 with a different heater
UBC
- UBC41/14L7 – Shielded dual diode + AF triode; EBC41 with a different heater; UBC81 with a Rimlock base
- UBC81 – Shielded dual diode + AF triode; EBC81/6BD7A with a different heater; UBC41 with a Noval base
UBF
- UBF11 – Dual diode + remote-cutoff pentode, Y8A steel tube base; EBF11 with a different heater
- UBF15 – Dual diode + remote-cutoff pentode, Y8A steel tube base; EBF15 with a different heater
- UBF80/17C8 – Dual diode + remote-cutoff pentode
- UBF89 = EdiSwan 19FL8 – Dual diode + remote-cutoff pentode
- UBF171 – Dual diode + remote-cutoff RF/IF/AF pentode, gnome tube; EBF171 with a different heater
UBL
- UBL1 – Dual diode + power pentode, Octal base
- UBL3 – Dual diode + power pentode, side-contact 8 base
- UBL21 = UBL71 – Dual diode + power pentode, B8G Loctal base
UC
- UC92/9AB4 – VHF triode for FM receiver front ends, single ECC81/12AT7 system; EC92/6AB4 with a different heater
UCC
- UCC84 – Dual triode for use as VHF cascode amplifier, Noval base; ECC84/6CW7 or PCC84/7AN7 with a different heater
- UCC85 – Dual triode for use as VHF oscillator/mixer up to 200 MHz, Noval base; ECC85/6AQ8, HCC85/17EW8 or PCC85/9AQ8 with a different heater
- UCC171 – Separate cathodes and separate heaters dual triode, 11-pin gnome tube with internal shield, prototype only; ECC171 with a different heater
UCF
- UCF12 – Triode + sharp-cutoff pentode for use as RF amplifier and superregenerative FM detector, Y8A steel tube base; ECF12 with a different heater
- UCF80 – VHF oscillator/mixer triode/pentode; ECF80/6BL8, LCF80/6LN8, PCF80/9A8 or XCF80/4BL8 with a different heater
- UCF174 – Triode + pentode, gnome tube, prototype only; ECF174 with a different heater
UCH
- UCH4 – Triode/remote-cutoff heptode mixer; UCH5 or UCH21 with an Octal base
- UCH5 – UCH4 or UCH21 with a side-contact 8 base
- UCH11 – Triode/remote-cutoff hexode mixer, Y8A steel tube base
- UCH21 = UCH71 – UCH4 or UCH5 with a B8G Loctal base
- UCH41 – Triode/remote-cutoff hexode mixer, Rimlock base
- UCH42/14K7 – Triode/remote-cutoff hexode mixer, Rimlock base; ECH42 with a different heater
- UCH43 – Triode/remote-cutoff hexode mixer, Rimlock base, low-microphonics version of UCH42; ECH43 with a different heater
- UCH81/19D8 – Triode/remote-cutoff heptode mixer; HCH81 with a different heater
- UCH171 – Triode/remote-cutoff heptode mixer, gnome tube; ECH171 with a different heater
UCL
- UCL11 – Triode + power tetrode, Y8A steel tube base
- UCL81 – Triode + power pentode; PCL81 with a different heater
- UCL82/50BM8 – AF triode + AF power pentode; ECL82/6BM8, LCL82/11BM8, PCL82/16A8 or XCL82/8B8 with a different heater
- UCL83 – Triode + power pentode; PCL83 with a different heater
UEL
- UEL11 – Tetrode + power tetrode, Y8A steel tube base; VEL11 with a different heater
- UEL51 – Tetrode + power pentode, Y10A steel tube 10-pin base
- UEL71 – Tetrode + power pentode, B8G 8-pin Loctal base; EEL71 with a different heater
- UEL171 – Remote-cutoff tetrode + 4-Watt power pentode, gnome tube; EEL171 with a different heater
UF
- UF5 – Remote-cutoff pentode, side-contact 8 base
- UF6 – Pentode, side-contact 8 base
- UF9 – Remote-cutoff pentode, Octal base
- UF11 – Remote-cutoff pentode, Y8A steel tube base
- UF14 – Sharp-cutoff pentode, Y8A steel tube base; EF14 or VF14 with a different heater
- UF15 – Remote-cutoff pentode, Y8A steel tube base; EF15 with a different heater
- UF21 – Remote-cutoff pentode, B8G Loctal base
- UF41/12AC5 – Remote-cutoff RF pentode, Rimlock base; EF41 with a different heater
- UF42 – Wideband pentode, Rimlock base; EF42 with a different heater
- UF43 – Wideband, remote-cutoff pentode, Rimlock base; EF43 with a different heater
- UF80/19BX6 – Sharp-cutoff RF/IF/Video pentode, Noval base; XF80/3BX6, EF80/6BX6 or 12BX6 with a different heater
- UF85/19BY7 – Remote-cutoff RF pentode
- UF86 – EF86/6BK8/6CF8 or PF86 with a different heater
- UF89 – Remote-cutoff IF pentode
- UF172 – RF/IF/AF Pentode, gnome tube; EF172 with a different heater
- UF174 – Pentode, gnome tube; EF174 with a different heater
- UF175 – Remote-cutoff RF/IF pentode, gnome tube; EF175 with a different heater
- UF176 – VHF Pentode, gnome tube, prototype only; EF176 with a different heater
- UF177 – VHF Pentode, gnome tube, prototype only; EF177 with a different heater
UFM
- UFM11 – Remote-cutoff AF pentode + top-view, "Magic Eye"-type tuning indicator, Y8A steel tube base; EFM11 with a different heater
UH
- UH171 – Sharp-cutoff heptode, gnome tube, prototype only
UL
- UL2 – Power pentode, side-contact 8 base
- UL11 – Power pentode, Y8A steel tube base
- UL12 – Power pentode, Y8A steel tube base
- UL21 = UL71 – Power pentode, B8G Loctal base
- UL41/45A5 – AF power pentode, Rimlock base
- UL44 – Power pentode, Rimlock base; EL44 with a different heater
- UL46 – Power pentode, Rimlock base[248]
- UL84/45B5 – AF power pentode
- UL171 – 4-Watts Power pentode, gnome tube; EL171 with a different heater
ULL
- ULL80 – Dual AF power pentode; ELL80, PLL80 with a different heater
UM
- UM4 (10M2) – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, Octal base; UM34 with a different pinout
- UM11 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, Y8A steel tube base; EM11 with a different heater
- UM34 – UM4 with a different pinout; HM34 with a different heater
- UM35 = EdiSwan 10M2 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, Octal base
- UM80/19BR5 – Side-view, fan-type tuning indicator for AM receivers
- UM81 – Side-view, fan-type tuning indicator
- 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 B9A base; EM83 with a different heater
- UM84/12FG6 – Side-view, band-type tuning/level indicator; PM84 with a different heater
- UM85 – Side-view, fan-type tuning indicator, Noval base; EM85 or HM85 with a different heater
- UM171 – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, gnome tube;[249] EM171 with a different heater
UQ
- UQ80 – Nonode; EQ80/6BE7 with a different heater
- UQ171 – Nonode, gnome tube, prototype only; EQ171 with a different heater
US
- US111 – TV sync oscillator, a special relaxation oscillator pentode with the suppressor grid on a separate pin to act as a second control grid, Y8A steel tube base with 2 unused pins, screen grid on top cap; see ES111
UY
- UY1, UY1N – 700 V, 140 mA Half-wave rectifier, Octal base with filament between pins 1 and 5/8
- UY2 – Half-wave rectifier, side-contact 5 base
- UY3 – Half-wave rectifier, side-contact 8 base
- UY4 – Half-wave rectifier, side-contact 8 base
- UY11 – 700 V, 140 mA Half-wave rectifier, Y8A steel tube base
- UY21 – 700 V, 140 mA Half-wave rectifier, B8G Loctal base
- UY31 – Half-wave rectifier, Octal base
- UY41/31A3 – 700 V, 100 mA Half-wave rectifier, Rimlock base
- UY42 – 700 V, 100 mA Half-wave rectifier, Rimlock base
- UY82/55N3 – 700 V, 180 mA Half-wave rectifier
- UY85/38A3 – 700 V, 110 mA Half-wave rectifier
- UY89/31AV3 – 700 V, 100 mA Half-wave rectifier
- UY92 – 400 V, 70 mA Half-wave rectifier
V - 50 mA heater
Notes:
- Apart from AC/DC radios,[250] "V" tubes were also used in miniaturized equipment with only one single supply for both anode and heater.[80]
- VATEA (VÁkuum TEchnológiA) Rádiótechnikai és Villamossági Rt.-t. (VATEA Radio Technology and Electric Co. Ltd., Budapest, Hungary) preceded the M-P designation with the letter V, as in VEL5 for EL5.
VBF
- VBF11 – Dual diode + pentode, Y8A steel tube base; EBF11 with a 38 V heater[135]
VC
VCH
- VCH11 – Triode/hexode mixer, Y8A steel tube base, ECH11 with a 38 V heater[135]
VCL
- VCL11 – Triode + power tetrode, 90 V heater, Y8A steel tube base
VEL
- VEL11 – AF Tetrode + AF beam power tetrode, Y8A steel tube base with E-tetrode grid on top cap, UEL11 with a 90 V heater[135]
VF
- VF3 – Pentode, side-contact 8 base; AF3 with a 55 V heater[135]
- VF7 – Pentode, side-contact 8 base; AF7, CF7 or EF7 with a 55 V heater[135]
- VF14 – Sharp-cutoff pentode, Y8A steel tube base; EF14 or UF14 with a 55 V heater[135]
- VF14M – Selected VF14 in production until the end of the 1950s for use as a preamplifier in Neumann condenser microphones U-47 and U-48 where they were run at only half their rated heater power to reduce noise[80]
VL
- VL1 – 1.6 W AF Pentode, side-contact 8 base, CL1 with a 55 V[250] heater[135]
- VL4 – 4 W AF Pentode, side-contact 8 base, CL4 with a 110 V heater[135]
VY
- VY1 – 60 mA Half-wave rectifier, 55 V[250] heater, side-contact 8 base[135]
- VY2 – 250 V, 20 mA Half-wave rectifier, 30 V heater, side-contact 5 base
X - 600 mA heater
XAA
- XAA91/3AL5 – Dual diode with separate cathodes, Miniature 7-pin base; EAA91/6AL5, HAA91/12AL5 or UAA91 with a different heater
XC
- XC95/2ER5 – Vari-μ VHF triode; EC95/6ER5, PC95/4ER5 with a different heater
- XC97/2FY5 – Frame-grid VHF triode; EC97/6FY5 or PC97/4FY5 with a different heater
- XC900/2HA5 – Frame-grid vari-μ VHF triode; EC900/6HA5, LC900/3HA5 or PC900/4HA5 with a different heater
XCC
- XCC82/7AU7 – Dual triode; ECC82/12AU7 with a different heater
- XCC189/4ES8 – Dual VHF triode for use as cascode amplifier; ECC189/6ES8, PCC189/7ES8 or YCC189/5ES8 with a different heater
XCF
- XCF80/4BL8 – VHF oscillator/mixer triode/pentode; ECF80/6BL8, PCF80/9A8, LCF80/6LN8 or UCF80 with a different heater
- XCF82/5U8 – Triode + pentode; ECF82/6U8 or PCF82/9U8A with a different heater
- XCF801/4GJ7 – VHF oscillator/mixer triode/pentode, Noval base; ECF801/6GJ7, LCF801/5GJ7 or PCF801/8GJ7 with a different heater
XCH
- XCH81/3AJ8 – Triode/heptode mixer; ECH81/6AJ8 with a different heater
XCL
- XCL82/8B8 – AF triode + AF power pentode; ECL82/6BM8, LCL82/11BM8, PCL82/16A8 or UCL82/50BM8 with a different heater
- XCL84/8DX8 – TV sync sep triode + CRT cathode drive power pentode; ECL84/6DX8, LCL84/10DX8 or PCL84/15DQ8 with a different heater
- XCL85/9GV8 – Triode + power pentode for CRT vertical deflection output; ECL85/6GV8, LCL85/10GV8 or PCL85/18GV8 with a different heater
XF
- XF80/3BX6 – Sharp-cutoff RF/IF/Video pentode, Noval base; EF80/6BX6, 12BX6 or UF80/19BX6 with a different heater
- XF85 – Remote-cutoff wideband RF pentode, Noval base; EF85/6BY7 or HF85 with a different heater
- XF94/3AU6 – Sharp-cutoff RF/IF/AF pentode, Miniature 7-pin base; EF94/6AU6 or HF94/12AU6 with a different heater
- XF183/3EH7 – Frame-grid, remote-cutoff IF pentode for use in TV receivers; EF183/6EH7 or LF183/YF183/4EH7 with a different heater[169]
- XF184/3EJ7 – Frame-grid, sharp-cutoff IF pentode for use in TV receivers; EF184/6EJ7 or LF184/YF184/4EJ7 with a different heater[170]
XL
- XL36/13CM5 – AF or CRT horizontal deflection output power pentode; EL36/6CM5 with a different heater
- XL84 – Power pentode; EL84 with a different heater
- XL86/8CW5 – AF or CRT vertical deflection output power pentode; EL86/6CW5, LL86/10CW5 or PL84/15CW5[182][183] with a different heater
- XL500/13GB5 – CRT horizontal deflection beam power pentode, Magnoval base; EL500/6GB5, LL500/18GB5 or PL500/27GB5 with a different heater
XY
- XY88/16AQ3 – CRT horizontal deflection output booster/damper/efficiency diode; EY88/6AL3, LY88/20AQ3 or PY88/30AE3 with a different heater
Y - 450 mA heater
YCC
- YCC189/5ES8 – Dual VHF triode for use as cascode amplifier; ECC189/6ES8, PCC189/7ES8 or XCC189/4ES8 with a different heater[251]
YF
- YF183/LF183/4EH7 – Frame-grid, remote-cutoff IF pentode for use in TV receivers; EF183/6EH7 or XF183/3EH7 with a different heater[169][212]
- YF184/LF184/4EJ7 – Frame-grid, sharp-cutoff IF pentode for use in TV receivers; EF184/6EJ7 or XF184/3EJ7 with a different heater[170][213]
Z - Cold-cathode tube
Notes:
- Special-quality cold-cathode "Z" tubes had a different function letter scheme.
- See also the professional tubes under Z
ZA
- Z860A – 250 V Arc discharge tube for use as switching element in a high voltage pulse generator such as an electric fence energizer, Noval base
- Z861A – 450 V Arc discharge tube, Noval base
- Z862A – 650 V Arc discharge tube, Noval base
- Z960A – 75 V Cold-cathode surge protector for receiver front ends, Miniature 7-pin base
ZC
- 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
- Z303C – Neon-filled, 4 kHz bidirecional decade Counter Dekatron
- Z563C – Neon-filled 4 kHz bidirecional decade Counter Dekatron
- Z565C – 4 kHz Bidirecional decade Counter Dekatron
- Z573C – Neon-filled 4 kHz bidirecional decade Counter Dekatron with aux anodes for direct control of Nixie tubes
ZE
- 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
ZM
- ZM11 – Neon-filled digital indicator tube, 21 mm character height, top-viewing, showing a cross with a central dot and independent arms, for use in industrial control panels
- ZM13 – Neon-filled digital indicator tube, 21 mmCH, top-viewing, showing a vertical line and a circle with a small gap, for use in industrial control panels
- ZM13U – Neon-filled digital indicator tube, 21 mmCH, top-viewing, showing a vertical line and a circle, for use in industrial control panels
- ZM14 – Neon-filled digital indicator tube, 21 mmCH, top-viewing, showing a vertical line, a circle, a triangle and a three-winged star, for use in industrial control panels
- Z510M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5 mmCH, top-viewing, no decimal point
- Z520M = ZM1020
- Z521M = ZM1021
- Z522M = ZM1040
- Z550M = 8453 = ZM1050
- Z560M – Z5600M with a red contrast filter coating
- Z561M = ZM1021 – Z5610M with a red contrast filter coating
- Z565M – Gas-filled digital indicator tube with a dekatron-type readout; similar to GR10A, Z503M and ZM1050
- Z566M – Z5660M with a red contrast filter coating
- Z567M – Z5670M with a red contrast filter coating
- Z568M – Z5680M with a red contrast filter coating
- Z570M – Z5700M with a red contrast filter coating
- Z571M – Z5710M with a red contrast filter coating
- Z573M – Z5730M with a red contrast filter coating
- Z574M – Z5740M with a red contrast filter coating
- Z580M – Z5800M with a red contrast filter coating
- Z581M – Z5810M with a red contrast filter coating
- Z590M – Z5900M with a red contrast filter coating
- Z870M – Z8700M with a red contrast filter coating
- Z5200M = ZM1022
- Z5220M = ZM1042
- Z5600M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5 mmCH, top-viewing, no decimal point
- Z5610M – A V Ω + - ~ % W Neon-filled digital indicator tube, 15.5 mmCH top-viewing, for use in digital multimeters
- Z5660M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 30 mmCH, side-viewing, no decimal point
- Z5670M – + - ~ Neon-filled digital indicator tube, 18/30 mmCH side-viewing
- Z5680M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 50 mmCH side-viewing, no decimal point
- Z5700M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13 mmCH side-viewing, no decimal point
- Z5710M – + - ~ Neon-filled digital indicator tube, 10.5/13 mmCH side-viewing
- Z5730M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13 mmCH side-viewing, right decimal points
- Z5740M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13 mmCH side-viewing, left decimal points
- Z5800M – T G M k m µ n p Neon-filled digital indicator tube, 13 mmCH side-viewing
- Z5810M – A F H S V Ω Hz s Neon-filled digital indicator tube, 13 mmCH side-viewing, for use in digital multimeters
- Z5900M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 10 mmCH side-viewing, both left and right decimal points
- Z8700M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 10 mmCH side-viewing, no decimal point, 5 dual cathodes and separate odd/even anode compartments for biquinary multiplexing
Note: More Nixie tubes under professional - ZM and ETL examples
ZS
- Z502S – Neon-filled, 4 kHz max. decade Counter/Selector Dekatron
- Z504S = ZM1070 = 8433 – Neon-filled, 5 kHz max. decade Counter/Selector Dekatron
- Z505S = ZM1060 – Argon-filled, 50 kHz max. decade Counter/Selector Dekatron
- 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
ZT
- Z50T – Subminiature, 6 mAavg, 24 mApeak, Gas-filled, cold-cathode trigger triode, 1 starter, all-glass with 3 wire-ends, for use as switch in bang–bang controllers
- Z300T = PL1267 (0A4G) – 25 mAavg, 100 mApeak, Gas-filled, cold-cathode DC trigger triode, one starter, Octal base
- Z900T = 5823 – 25 mAavg, 100 mApeak, Gas-filled, cold-cathode AC trigger triode, one starter, Miniature 7-pin base
ZU
- Z0.7/10U – 700 V, 500 mAavg, 10 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage[136]
- Z0.7/100U – 700 V, 2 Aavg, 100 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage, for triggering ignitrons[136]
- Z1/100U – 1 kV, 2 Aavg, 100 Apeak, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage, for use in welding machines[136]
- Z70U = 7710 – Subminiature, 3 mAavg, 12 mApeak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a primer electrode, 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, one starter and a primer electrode, positive starter voltage, all-glass wire-ended, for use in Dekatron circuits up to 2...5 kHz
- Z701U – Subminiature, Gas-filled, cold-cathode trigger tetrode, all-glass wire-ended
- Z800U – 2.5 mAavg, 10 mApeak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a primer electrode, positive starter voltage, Noval base, for voltage control, sensitive relay circuits and timers
- Z801U – 2.5 mAavg, 10 mApeak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a primer electrode, negative starter voltage, Noval base, for use with Geiger-Müller tubes
- Z803U = 6779 (ZC1020) – 25 mAavg, 100 mApeak, Gas-filled, cold-cathode DC trigger tetrode, one starter and a primer electrode, positive starter voltage, Noval base, for voltage control, sensitive relay circuits and timers
- Z804U = 7713 – 5 mAavg, 25 mApeak, Gas-filled, cold-cathode AC trigger tetrode, one starter and a primer envelope coating, negative starter voltage, 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, one starter, two primers and separate cathode and anode shields on individual pins, positive starter voltage, Noval base, direct operation from a 200...250VAC mains grid, for relay drivers, timers, photoelectric controls, etc.
ZW
- Z70W = 7709 – 4 mA, Gas-filled, cold-cathode DC trigger pentode, two starters and a primer electrode, positive starter voltage, all-glass with 5 wire-ends, for use in bidirectional counters
- Z660W (Cerberus GR43) – 12 mAavg, 50 mApeak, Gas-filled, cold-cathode DC trigger pentode, two starters and a primer electrode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage, for use in bidirectional counters
- Z661W (ZC1010) – 8 mAavg, 50 mApeak, Gas-filled, cold-cathode AC trigger pentode, two starters and a primer electrode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage, for use in bidirectional counters
- Z700W – 4 mA, Gas-filled, cold-cathode DC trigger pentode, two starters and a primer electrode, positive starter voltage, all-glass with 5 wire-ends, for use in bidirectional counters
- Z806W – Gas-filled, cold-cathode trigger tetrode, one starter and dual primer, Noval base, used in elevator controls
- Z865W – 25 mAavg, 200 mApeak Gas-filled, cold-cathode AC/DC trigger tetrode, one starter and a primer electrode, low positive starter voltage for transistorized circuits, Noval base, envelope inside radioactively coated for a constant ignition voltage, for use as a relay driver
ZX
- Z860X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode DC trigger pentode, two starters, a primer electrode and an internal shield, positive starter voltage, Noval base, envelope inside radioactively coated for a constant ignition voltage, for use in counters
- Z861X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode AC trigger pentode, two starters, a primer electrode and an internal shield, positive starter voltage, Noval base, envelope inside radioactively coated for a constant ignition voltage, for use in counters
- Z863X – 40 mAavg, 200 mApeak, Gas-filled, cold-cathode DC trigger pentode, two starters, a primer electrode and an internal shield, negative starter voltage, Noval base, envelope inside radioactively coated for a constant ignition voltage, for use in counters
List of Pro Electron professional tubes
Note: Typecode explained above.
X - Electro-optical devices
XA
- XA1003 – Phototube, Caesium-on-oxidated-silver photocathode, spectral S1 response, all-glass with 2 wire-ends
XG
- XG2000 – Image converter for X-ray diagnostics
XL
- XL7900 – Vibrating-capacitor chopper front end for dosimeters, electrometers, pH meters etc., Magnoval base with gold-plated pins[136]
XM
- XM1000 – Nimo tube, directly heated cathode-ray 1-digit numeric display tube, decimal points on both sides, hence 12 stenciled electron guns, top-viewing, green, 15 mm high Futura Medium font, oval envelope for easy horizontal stacking, 14-pin base
XP
- XP1000 – 10-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal (14-pin) base
- XP1001 – 10-stage photomultiplier for gamma ray scintillation spectrometry, Sb-Cs cathode, Ag-Mg-O-Cs dynodes
- XP1002 – 10-stage photomultiplier, blue/green/yellow/orange-sensitive Sb-Na-K-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1003 – 10-stage photomultiplier with Silica window, UV/blue/green/yellow/orange-sensitive Sb-Na-K-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1004 – 10-stage photomultiplier with Silica window, UV/blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1005 – 10-stage Ag-O-Cs (800±100 nm) photomultiplier, IR/red-sensitive Ag-O-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1010 – 10-stage photomultiplier for r-ray and gamma ray scintillation spectrometry, selected 150AVP for low noise and resolution, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Duodecal (12-pin) base
- XP1011 – 10-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, shock/vibration-proof, Duodecal base
- XP1020 – 12-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, 100 Ω coaxial output, Duodecal (20-pin) base
- XP1021 – 12-stage photomultiplier, UV/blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, 50 Ω coaxial output, Duodecal base
- XP1023 – 12-stage photomultiplier with Silica window Sb-Cs cathode, Ag-Mg-O-Cs dynodes, UV/blue-sensitive, 50 Ω coaxial output, Duodecal base
- XP1030 – 10-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal (14-pin) base
- XP1031 – 10-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, for gamma ray scintillation spectrometry
- XP1032 – 10-stage photomultiplier with 3 mm Silica window, UV/blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1033 – 10-stage photomultiplier with 10 mm Silica window, UV/blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, Diheptal base
- XP1040 – 14-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, concave window, Duodecal base
- XP1110 – Photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes
- XP1111 – Photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, wire-ended
- XP1113 – 6-stage Photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes
- XP1114 – 4-stage Photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes
- XP1115 – Photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, wire-ended, shock/vibration-proof
- XP1116 – Photomultiplier, red-sensitive Ag-O-Cs cathode, Ag-Mg-O-Cs dynodes, shock/vibration-proof
- XP1117 – 9-stage photomultiplier, blue/green/yellow/orange-sensitive Sb-Na-K-Cs cathode, Ag-Mg-O-Cs dynodes
- XP1118 – Photomultiplier with Silica window, UV/blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes
- 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 10−5 mmHg (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
- XP1140 – 6-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, fast, Diheptal base
- XP1141 – 7-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, fast, Diheptal base
- XP1180 = 52AVP – 10-stage photomultiplier, blue-sensitive Sb-Cs cathode, Ag-Mg-O-Cs dynodes, fast, Diheptal base
- XP1240 – Photomultiplier
XQ
- XQ1010 – 1" Vidicon, resolution ≥600 TV lines
- XQ1020 (B/W), XQ1020L (luminance channel), XQ1020B (blue channel), XQ1020G (green channel), XQ1020R (red channel) – 30 mm (6⁄5 in) Color TV broadcast-grade Plumbicon, resolution ≥600 TV lines
- XQ1021/B/G/R – XQ1020 for industrial use
- XQ1022 (30mm), XQ1072 (1") – Plumbicon for use with an X-ray image intensifier in medical equipment
- XQ1023/L/R – 30mm Plumbicon, resolution ≥700 TV lines
- XQ1024/R – XQ1023 for industrial use
- XQ1025/L/R – XQ1023 with an IR reflection filter
- XQ1029R – Camera tube, red channel
- XQ1031 (industrial-grade), XQ1032 (commercial-grade) – 1" Vidicon, magnetic focusing and deflection, Sb2S3 target
- XQ1040, XQ1050 (for film scanning), XQ1042, XQ1052 (broadcast-grade), XQ1043, XQ1053 (industrial-grade), XQ1044, XQ1054 (commercial-grade) – 1" Vidicon
- XQ1070/L/B/G/R – 1" Color TV broadcast-grade Plumbicon, resolution ≥600 TV lines
- XQ1071/B/G/R – XQ1070 for industrial use
- XQ1073R – 1" Plumbicon, extended red response, resolution ≥750 TV lines
- XQ1073X – 1" Plumbicon, matched to X-ray image intensifiers with P20 phosphor
- XQ1074 – XQ1073 for industrial use
- XQ1075/R – XQ1073 with extended red response and an IR reflection filter
- XQ1076/R – XQ1075 for industrial use
- XQ1200 – Electron Bombarded Silicon Tube, a Vidicon with a silicon target; cf. 7610, XQ1340, ЭПЛ-1
- XQ1270 (≥400 TV lines), XQ1271 (≥550 TV lines), XQ1272 (≥500 TV lines) – ⅔" Commercial-grade Vidicon, Sb2S3 target, overall length 10.8 cm (4+1⁄4 in)
- XQ1274 – ⅔" Newvicon, magnetic focussing and deflection, ZnSe + CdZnTe target, for use in low-light security cameras, resolution ≥650 TV lines
- XQ1275 – ⅔" 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" Vidicon, magnetic focusing and deflection, precision electron gun, Sb2S3 target, fiber optic interface to X-ray image intensifiers with P11 or P20 phosphors and fiber optic output, for use in medical equipment
- XQ1290 – 1" Resistron camera tube, Sb2S3 target, for use with X-ray image intensifiers in medical equipment
- XQ1293 – Camera tube
- XQ1300 – Saticon camera tube
- XQ1340 – Electron Bombarded Silicon Tube, a low-light Vidicon with a silicon target;[252] cf. 7610, XQ1200, ЭПЛ-1
- XQ1371 – Resistron camera tube
- XQ1380 – XQ1274 with radiation resistant (anti-browning) faceplate
- XQ1381 – ⅔" 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) – ⅔" Plumbicon, low lag
- XQ1430B/G/R – Color TV broadcast-grade Plumbicon
- XQ1435B/G/R – Color TV broadcast-grade Plumbicon
- XQ1440, XQ1442, XQ1443, XQ1445 – 1" Newvicon, separate mesh, ZnSe + CdZnTe target
- XQ1500/L/B/G/R, XQ1503R (extended red response), XQ1505R (extended red response and IR filter) – 1" Color TV broadcast-grade Plumbicon
- XQ1560 – 1" Saticon camera tube
- XQ1565 – 1" 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" Plumbicon
- XQ1585 – 1" Saticon camera tube
- XQ1600 – ½" Commercial-grade Vidicon, separate mesh, electrostatic focusing and magnetic deflection
- XQ1601, XQ1602 (radiation-resistant) – ½" 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" Plumbicon
- XQ2172/X – 1" Plumbicon, wide dynamic range matched to X-ray image intensifiers with P20 phosphor, for use in digital radiography applications
- XQ2182 – 1" Plumbicon, wide dynamic range matched to digital radiography applications
- XQ2427/B/G/R (color TV broadcast-grade), XQ2428 (industrial-grade) – ⅔" 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" Plumbicon
- XQ3427/B/G/R – ⅔" Color TV broadcast-grade Plumbicon
- XQ3430B/G/R – Color TV broadcast-grade Plumbicon
- 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 – ⅔" Color TV broadcast-grade Plumbicon
- XQ3467/B/G/R – ⅔" Color TV broadcast-grade Plumbicon
- XQ3477B/G/R – Color TV broadcast-grade Plumbicon
- XQ3487/B/G/R – Color TV broadcast-grade Plumbicon
- XQ3550B/G/R – Color TV broadcast-grade Plumbicon
- XQ3555B/G/R – Color TV broadcast-grade Plumbicon
- XQ4187/B/G/R – ⅔" Color TV broadcast-grade Plumbicon
- XQ4502/A – 30mm/45mm Plumbicon, highest resolution, low lag, for use with X-ray image intensifiers in medical equipment
- XQ5002 – 2" Plumbicon, electrostsatic deflection for improved corner resolution, low output capacitance
- XQ7002 – 1" Plumbicon, low output capacitance
- XQ8002 – 1" Plumbicon camera tube
- XQ9002 – 1" Plumbicon camera tube
XR
- XR1000 – Monoscope, test pattern specified by suffix
XX
- XX1000 – 2-stage image intensifier
- XX1010 – Image intensifier
- XX1020 – Image intensifier
- XX1030 – Image intensifier
- XX1050 – 1-stage image intensifier with fiber optics, S25 photocathode, P20 phosphor
- XX1060 – 3-stage image intensifier with fiber optics, S25, P20, for use in night vision equipment[253]
- XX1066 – 1. Gen. 3-stage image intensifier, S25, P20[252]
- XX1140 – 1. Gen. 3-stage image intensifier
- XX1190 – 1. Gen. inverter, 1-stage image intensifier, S25, P20[252]
- XX1192 – 1. Gen. inverter, 1-stage image intensifier
- XX1200 – 1. Gen. inverter, 1-stage image intensifier, S25, P20[252]
- XX1211 – 1. Gen. 3-stage image intensifier, S25, P20[252]
- XX1270 – 1. Gen. inverter, 2-stage image intensifier
- XX1400 – 2. Gen. inverter, 1-stage image intensifier, S25, P20[252]
- XX1430 – 1. Gen. inverter, 1-stage image intensifier, S25, P20[252]
- XX1510 – 1. Gen. 3-stage image intensifier
- XX1610 – 2. Gen. image intensifier
- XX1800 – 2. Gen. proximity focused, 1-stage image intensifier
Y - Vacuum tubes
YA
- YA1000 – 5 kV, 5 mA Directly heated, thermally-limited (=saturated) emission diode, 4.3 V/325 mAmax uncoated tungsten filament, Noval base, for use as an RMS heating current-to-DC anode current converter in AC voltage/current stabilizer circuits;[254] cf. 5845, Tesla RA0007
YD
- YD1000 = Siemens RS2021W – 10 MHz, 45 kW, Water jacket-cooled RF power triode
- YD1001 = RS2021L – 10 MHz, 35 kW, Forced-air cooled RF power triode
- YD1012 – 10 MHz, 180 kW, Vapor-cooled RF power triode
- YD1130 – 30 MHz, 400 W, Forced-air cooled, linear RF/AF power triode
- YD1150 = 8728 (Forced-air cooled), YD1152 = 8730 (Water helix-cooled) – 160 MHz, 2.5 kW VHF power triode
- YD1160 = 8731 (Forced-air cooled), YD1161 = 8732 (Water jacket-cooled), YD1162 = 8733 (Water helix-cooled) – 120 MHz, 5 kW VHF power triode
- YD1170 = 8666 (Forced-air cooled), YD1171 (Water jacket-cooled), YD1172 = 8668 (Water helix-cooled) – 120 MHz, 10 kW VHF power triode
- YD1173 = 8734 – 50 MHz, 10 kW Forced-air cooled RF power triode
- YD1175 = 8952 – 120 MHz, 10 kW Forced-air cooled VHF power triode
- YD1177 = 8958 – 120 MHz, 15 kW Water helix-cooled VHF power triode
- YD1180 = 8801 – 100 MHz, 15 kW Forced-air cooled VHF power triode
- YD1182 = 8735 – 100 MHz, 20 kW Water jacket-cooled VHF power triode
- YD1192 = 8736 (Water jacket-cooled), YD1193 (Vapor-cooled) – 30 MHz, 40 kW RF power triode
- YD1195 = 8913 – 100 MHz, 30 kW Forced-air cooled VHF power triode
- YD1197 = 8937 – 100 MHz, 40 kW Water jacket-cooled VHF power triode
- YD1202 = 8752 (Water jacket-cooled), YD1203 (Vapor-cooled) – 30 MHz, 80 kW RF power triode
- YD1212 = 8680 (Water jacket-cooled), YD1213 (Vapor-cooled) – 30 MHz, 120 kW RF power triode
- YD1252 = RS2051V – 180 kW, Vapor-cooled modulator power triode
- YD1300, YD1301, YD1302 – 1 GHz, 300 W, Forced-air cooled UHF power triode
- YD1332 – 960 MHz, 1.8 kW, Forced-air cooled UHF power triode
- YD1333 – 960 MHz, 900 W, Forced-air cooled UHF power triode
- YD1334 – 1 GHz, 1.8 kW, Forced-air cooled UHF power triode
- YD1335 – 1 GHz, 1.9 kW, Forced-air cooled UHF power triode
- YD1336 – 1 GHz, 1.8 kW, Forced-air cooled UHF power triode
- YD1342 = 8918 – 30 MHz, 530 kW, Water-cooled RF power triode
- YD1352S = 8867 = Amperex DX334 – 5 MHz, 2 kW, 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
YG
- YG1000 – Directly heated electrometer tetrode with an oxide cathode and a space charge grid, grid current ≤600 fA, Magnoval base with input grid on top cap
YH
- YH1000 – 1.7 to 2.3 GHz (L band), 16 W Traveling-wave tube for use in point-to-point radio links
- YH1050 – 4.4 to 5.0 GHz (C band), 2 W Traveling-wave tube for use in point-to-point radio links
- YH1100 – 8.0 to 12.4 GHz (X band), 25 mW, Contact-cooled backward-wave oscillator[255]
- YH1110 – 5.8 to 8.5 GHz (C band), 15 W Traveling-wave tube for use in point-to-point radio links
- YH1120 – 5.8 to 8.5 GHz (C band), 10 W Traveling-wave tube for use in point-to-point radio links
- YH1131 – 11.7 to 12.7 GHz (Ku band), 10 W Traveling-wave tube
- YH1150 – 1.7 to 2.3 GHz (L band), 1 kW Traveling-wave tube for use in satellite ground stations/radar/troposcatter
- YH1160 – 3.6 to 4.2 GHz (S band), 14 W Traveling-wave tube for use in point-to-point radio links
- YH1181 – 4.4 to 5.0 GHz (C band), 1 kW Traveling-wave tube for use in satellite ground stations/radar/troposcatter
- YH1190 – 11.7 to 12.7 GHz (Ku band), 70 W Traveling-wave tube for use in satellite ground stations/radar/troposcatter
- YH1200 – 5.8 to 7.5 GHz (C band), 12 W Traveling-wave tube
- YH1210 – 470 to 860 MHz, 220 W Traveling-wave tube for use in UHF TV transposers
YJ
- YJ1000 – 9.19 to 9.32 GHz (X band), 2.5 kW Indirectly heated Magnetron for use as a pulsed oscillator
- YJ1420 – 2.43 to 2.47 GHz, 900 W Magnetron for use in domestic microwave ovens
- YJ1462 – 9.375 GHz (X band), 28 kW Indirectly heated coaxial Magnetron for use as a pulsed oscillator
YK
- YK1000 – 400 to 620 MHz (Band Ⅳ), 11 kW Water-cooled UHF permanent magnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1004 – 610 to 790 MHz (Band Ⅴ), 11 kW Water-cooled UHF permanent magnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1005 – 470 to 860 MHz, 11 kW Water-cooled UHF permanent magnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1010 – 67 to 74 GHz (V band), 130 mW Reflex Klystron
- YK1046 – 9.16 to 9.34 GHz (X band), 35 mW Reflex Klystron
- YK107x – 5.9 to 8.1 GHz (C band), 1.2 W Reflex Klystrons, contact-cooled variants of the YK114x
- YK1090 (Wire-ended), YK1091 (B3A 3-pin base) – 10.5 to 12.2 GHz (X band), 400 mW Reflex Klystrons
- YK1110 – 6 MWpeak, 2998±5 MHz Water-cooled, electromagnet-focused linear-beam, 3-cavity pulsed Klystron for use in linear particle accelerators
- YK114x (KS6/1000x, KS7/1000x) – 5.9 to 8.1 GHz (C band), 1.2 W Reflex Klystrons, forced-air cooled variants of the YK107x
- YK1151 – 470 to 860 MHz, 25 kW Forced-air cooled UHF permanent magnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1190 – 470 to 610 MHz, 40 kW Water-cooled UHF electromagnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1191 – 590 to 720 MHz, 40 kW Water-cooled UHF electromagnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1192 – 710 to 860 MHz, 40 kW Water-cooled UHF electromagnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1200 – 25 MWpeak, 2998±5 MHz Water-cooled, electromagnet-focused linear-beam, 5-cavity pulsed Klystron for use in linear particle accelerators
- YK1220 – 470 to 860 MHz, 15 kW Water-cooled UHF electromagnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1223 – YK1220 with a modulating anode
- YK1230 – 470 to 860 MHz, 25 kW Water-cooled UHF electromagnet-focused linear-beam, 4-cavity Klystron for use in TV transmitters
- YK1233 – YK1230 with a modulating anode
YL
- YL1000 = 8463 – 50 MHz, 12 W RF power pentode, 1.1 V/880 mA quickstart heater, B9A Noval base
- YL1020 = 8118 = QQZ03/20
- YL1030 = QQZ06/40
- YL1050 – 1215 MHz, 1.6 kW Forced-air cooled, coaxial, ceramic/metal UHF power tetrode, 3.8 V/20.5 A heater
- YL1060 = 7854 = QQE06/40
- YL1070 = 8117 (Center-tapped 12.6 resp. 6.3 V heater), YL1071 = 8116 (center-tapped 26.5 resp. 13.25 V heater) – 60 MHz, 100 W Dual linear RF power tetrode, B7A Septar base
- YL1080 = 8348 – 200 MHz, 5 W Dual VHF power tetrode, internally neutralized, 1.6 V/2.5 A quickstart heater, Noval base
- YL1120 = 8429 – 60 MHz, 4 kW Forced-air cooled, coaxial, ceramic/metal, linear RF power tetrode, 16 V/16.5 A heater
- YL1130 = 8408 – 200 MHz, 4 W Dual VHF power pentode, internally neutralized, 1.1 V/2.9 A quickstart heater, Noval base
- YL1150 = 8579 – 60 MHz, 75 W Linear RF beam power tetrode, center-tapped 12.6 resp. 6.3 V heater, Septar base
- YL1190 = 8580 – 500 MHz, 8 W Dual UHF power tetrode, internally neutralized, 1.1 V/4.2 A quickstart heater, B9D Magnoval base
- YL1200 = PE1/100
- YL1210 = 8457 – QQE03/12 with a center-tapped 12.6 resp. 6.3 V heater
- YL1220 = 8577 – QQE02/5 with a center-tapped 13.5 resp. 6.75 V heater
- YL1240 = 8458 – 200 MHz, 10 W Dual VHF power tetrode, internally neutralized, center-tapped 13.5 resp. 6.75 V heater, B9E Novar base
- YL1250 = 8505 – 250 MHz, 30 W VHF beam power tetrode, center-tapped 13.5 resp. 6.75 V heater, Magnoval base
- YL1270 = 8581 – 500 MHz, 18 W Dual UHF power tetrode, internally neutralized, 1.1 V/4 A quickstart heater, B8G Loctal base
- YL1290 – QE08/200 with a 19 V/1.4 A heater
- YL1310 = 8603 – 75 MHz, 30 W RF beam power tetrode, 1.2 V/4.2 A quickstart heater, Magnoval base
- YL1360 – QQE04/5 with a 13.5 V/280 mA heater
- YL1370 = 6146B (6.3 V/1.125 A heater), YL1371 (12.6 V/562 mA heater), YL1372 (26.5 V/300 mA heater) – 60 MHz, 35 W RF beam power tetrode, K8A Octal base
- YL1570 (RS1084CJ) – 250 MHz, 60 kW Water-cooled, coaxial, ceramic/metal, linear VHF power tetrode, 12.5 V/200 A heater
Z - Gas-filled tubes
Note: See also standard M-P tubes under Z
ZA
- ZA1000 – Neon-filled, coaxial, tritium-primed (half-life: 12.32 years), sputtered-molybdenum cold-cathode switching diode, meshed cylinder anode, all-glass wire-ended[256]
- ZA1001 – 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, large 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 for use as indicator tube in transistorized circuits, meshed cylinder anode, all-glass with 3 wire-ends
- ZA1004 – Neon-filled, coaxial, tritium-primed, sputtered-molybdenum cold-cathode switching diode, small difference between burning and ignition voltage, for use as indicator tube in transistorized circuits or as 86.4 V voltage-regulator tube, meshed cylinder anode, all-glass with 3 wire-ends
- ZA1005 – Neon-filled, coaxial, tritium-primed, sputtered-molybdenum cold-cathode switching diode for use like a DIAC in thyristor circuits, meshed cylinder anode, all-glass with 2 wire-ends
ZC
- ZC1010 (Z661W) – 8 mAavg, 50 mApeak, Gas-filled, cold-cathode AC trigger pentode, two starters and a primer electrode, positive starter voltage, all-glass with 5 wire-ends, envelope inside radioactively coated for a constant ignition voltage, for use in bidirectional counters
- ZC1030 – 4 mA, Gas-filled, cold-cathode trigger tetrode, one starter and a primer, positive starter voltage, all-glass with 4 wire-ends, for use in high-speed counting and switching circuits[257]: 719ff
- ZC1031 – 3 mA, Neon-filled, cold-cathode, luminescent trigger tetrode, one starter and a primer, 0.0018 ft-c (19.368 mlx) light output for use as self-displaying shift register cells in large-format, crawling-text dot-matrix displays, all-glass wire-ended[257]: 725ff
- ZC1040 – 25 mA, Gas-filled, cold-cathode AC trigger tetrode, one starter and a primer, positive starter voltage, Noval base
- ZC1050 – 2 mA, Gas-filled, cold-cathode, luminescent trigger tetrode, one starter and a primer, 300 mlm light output[258] for use as self-displaying shift register cells in large-format, crawling-text dot-matrix displays,[259] 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
ZM
- 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
- ZM1000R – ZM1000 with a red contrast filter coating
- ZM1001 – + - ~ X Y Z Neon-filled digital indicator tube, 14mmCH side-viewing, for use with ZM1000
- ZM1001R – ZM1001 with a red contrast filter coating, for use with ZM1000R
- ZM1002 – ns µs ms s Hz kHz MHz Neon-filled digital indicator tube, 13mmCH side viewing, for use with ZM1000 in digital frequency counters
- ZM1003 – 1 - + Neon-filled digital indicator tube, 14mmCH side-viewing, for use with ZM1000
- ZM1005 – 0 1 2 3 4 5 6 7 8 9 Long-life neon-filled digital indicator tube, 14mmCH side-viewing, left decimal point, multiplex-capable
- ZM1005R – ZM1005 with a red contrast filter coating
- ZM1006 – 1 2 3 4 5 6 Neon-filled digital indicator tube, side-viewing, left and right decimal point, for use in TV receivers
- ZM1008 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 14mmCH side-viewing
- ZM1010 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 14mmCH side-viewing, left decimal point
- ZM1012 – 0 1 2 3 4 5 6 7 8 Neon-filled digital indicator tube, 14mmCH side-viewing
- ZM1015 – 0 1 2 3 4 5 6 7 8 Neon-filled digital indicator tube, 14mmCH side-viewing
- ZM1020 = Z520M – ZM1022 with a red contrast filter coating
- ZM1021 = Z521M – ZM1023 with a red contrast filter coating, for use with ZM1020
- ZM1022 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH top-viewing, no decimal point
- ZM1023 – A V Ω % + - ~ Neon-filled digital indicator tube, 15.5mmCH top-viewing, for use with ZM1022 in digital multimeters
- ZM1024 – ZM1025 with a red contrast filter coating, for use with ZM1020
- ZM1025 – c/s Kc/s Mc/s µs ms ns s Neon-filled digital indicator tube, 15.5mmCH top-viewing, for use with ZM1022 in digital frequency counters
- ZM1030 – ZM1032 with a red contrast filter coating
- ZM1031 – ZM1031/01 without the ~
- ZM1031/01 – ZM1033/01 with a red contrast filter coating, for use with ZM1030
- ZM1032 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH side-viewing, no decimal point, 5 dual cathodes and separate odd/even anode compartments for biquinary multiplexing
- ZM1033/01 – + - ~ Neon-filled digital indicator tube, 15.5mmCH side-viewing, separate anode compartment for + , for use with ZM1032
- ZM1040 = Z522M – ZM1042 with a red contrast filter coating
- ZM1041 – ZM1043 with a red contrast filter coating, for use with ZM1040
- ZM1041S – ZM1043S with a red contrast filter coating, for use with ZM1040
- ZM1042 = Z5220M – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 30mmCH side-viewing, no decimal point
- ZM1043 – + - Neon-filled digital indicator tube, 30mmCH side-viewing, for use with ZM1042
- ZM1043S – Y X + W U Z - Neon-filled digital indicator tube, 30mmCH side-viewing, for use with ZM1042
- ZM1047 – ZM1049 with a red contrast filter coating, for use with ZM1040
- ZM1049 – T F S N Z Y G H M X Neon-filled digital indicator tube, side-viewing, for use with ZM1042 in numerical control systems
- ZM1050 = Z550M = 8453 – Neon-filled digital indicator tube, top-viewing, dekatron-type readout with common anode and common cathode, pulsating anode voltage, controlled by 5-volts sensitive starter electrodes, for transistorized circuits
- ZM1060 = Z505S – Argon-filled, 50 kHz decade Counter/Selector Dekatron
- ZM1070 = Z504S = 8433 – Neon-filled, 5 kHz decade Counter/Selector Dekatron
- ZM1080 – ZM1082 with a red contrast filter coating
- ZM1081 – ZM1083 with a red contrast filter coating, for use with ZM1080
- ZM1082 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 14mmCH side-viewing, no decimal point, probe electrode
- ZM1083 – + - ~ Neon-filled digital indicator tube, 14mmCH side-viewing, for use with ZM1082
- ZM1100 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH top-viewing
- ZM1120 – ZM1122 with a red contrast filter coating
- ZM1122 – 0 1 2 3 4 5 6 7 8 9 Miniature neon-filled digital indicator tube, 7.8mmCH top-viewing
- ZM1130 – ZM1132 with a red contrast filter coating
- ZM1131 – ZM1133 with a red contrast filter coating, for use with ZM1080
- ZM1132 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, side-viewing, left and right decimal point
- ZM1133 – + - ~ Neon-filled digital indicator tube, side-viewing, for use with ZM1132
- ZM1136L/R – ZM1138L/R with a red contrast filter coating
- ZM1137 – ZM1139 with a red contrast filter coating, for use with ZM1136L/R
- ZM1138L/R – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13mmCH side-viewing, left or right decimal points (specify)
- ZM1139 – + - ~ Ω Neon-filled digital indicator tube, 13mmCH side-viewing, for use with ZM1138 in digital multimeters
- ZM1162 – 0 1 2 3 4 5 6 7 8 9 Long-life neon-filled digital indicator tube, 15.5mmCH top-viewing, 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 digital indicator tube, 15.5mmCH side-viewing, no decimal point
- ZM1174 – ZM1175 with a red contrast filter coating
- ZM1175 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH side-viewing, 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, for use with ZM1180
- ZM1182 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 16mmCH top-viewing, no decimal point, semi-rectangular envelope for close horizontal stacking
- ZM1183 – + - ~ Ω Neon-filled digital indicator tube, top-viewing, 13mmCH for use with ZM1182 in digital multimeters
- ZM1184D – ZM1185D with a red contrast filter coating
- ZM1185A (GR1420) – 1 2 3 4 5 6 U K E R Neon-filled digital indicator tube, 16mmCH top-viewing
- ZM1185D (GR1430) – ∇ Δ Neon-filled digital indicator tube, 16mmCH top-viewing, for use in elevators
- ZM1185E (GR1472) – 0 1 2 3 4 5 - t kg + Neon-filled digital indicator tube, 16mmCH top-viewing
- 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
- ZM1210 – ZM1212 with a red contrast filter coating
- ZM1212 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 15.5mmCH side-viewing, 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 digital indicator tube, 40mmCH side-viewing
- 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
- ZM1240 – ZM1242 with a red contrast filter coating
- ZM1241 – ZM1243 with a red contrast filter coating, for use with ZM1240
- ZM1242 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 16mmCH side-viewing, right decimal point
- ZM1243 – + - ~ Ω Neon-filled digital indicator tube, 16mmCH side-viewing, for use with ZM1242 in digital multimeters
- 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 – ~ ⚫ Neon-filled digital indicator tube, 10mmCH side-viewing
- ZM1290 – ZM1292 with a red contrast filter coating
- ZM1292 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 10mmCH side-viewing
- ZM1330 – ZM1332 with a red contrast filter coating
- ZM1331 – ZM1333 with a red contrast filter coating, for use with ZM1330
- ZM1332 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13.1mmCH side-viewing, left and right decimal points, all-glass wire-ended
- ZM1333 – + - ~ Ω Neon-filled digital indicator tube, 13.1mmCH side-viewing, all-glass wire-ended, for use with ZM1332 in digital multimeters
- ZM1334 – ZM1336 with a red contrast filter coating
- ZM1335 – ZM1337 with a red contrast filter coating, for use with ZM1334
- ZM1336 – 0 1 2 3 4 5 6 7 8 9 Neon-filled digital indicator tube, 13.1mmCH side-viewing, left and right decimal points, multiplex-capable
- ZM1337 – + - ~ Ω Neon-filled digital indicator tube, 13.0mmCH side-viewing, right decimal point (!), all-glass wire-ended, red contrast filter coating, for use with ZM1336 in digital multimeters
- ZM1350 – Varisymbol, planar neon-filled digital 40mm × 27mm fourteen-segment display tube, right decimal point, separate underscore text cursor, keep-alive cathode, multiplex-capable, viewing angle 160°
- ZM1360 – ZM1350 with 60mm × 40mm characters
- ZM1370 – ZM1350 with 20mm × 13mm characters
- ZM1410 – ZM1412 with a red contrast filter coating
- ZM1412 – Neon-filled digital seven-segment display tube, 8.6mmCH side-viewing, right decimal point and left punctuation mark, all-glass wire-ended
- ZM1500 – Pandicon, multiplexed 12-digit, 7-segment display tube
- ZM1550 – Planar neon-filled digital two-digit seven-segment display tube, right decimal points
- ZM1551 – Planar neon-filled digital 1½-digit seven-segment display tube with + and - signs, right decimal points
Note: More Nixie tubes under standard - ZM and ETL examples
ZP
- ZP1000 – Boron trifluoride-filled, thermal neutrons proportional detector
- ZP1010 – Boron trifluoride-filled, thermal neutrons proportional detector
- ZP1020 – Boron trifluoride-filled, thermal neutrons proportional detector
- ZP1070 – Subminiature Geiger-Müller tube, all-glass wire-ended
- ZP1080 – Halogen-quenched Geiger-Müller tube, β and γ
- ZP1100 – Halogen-quenched Geiger-Müller tube, γ, wire-ended
- ZP1200, ZP1210, ZP1220 – Halogen-quenched Geiger-Müller tube, γ
- ZP1300, ZP1310 – Halogen-quenched Geiger-Müller tube, γ and high-energy (>500 keV) β
- ZP1320 – Halogen-quenched Geiger-Müller tube, γ and high-energy (>250 keV) β
- ZP1330 – Halogen-quenched Geiger-Müller tube, for use in damp and/or saline atmosphere, β and γ
- ZP1400 – Halogen-quenched Geiger-Müller tube, 9mm diameter mica window, β and γ
- ZP1410 – Halogen-quenched Geiger-Müller tube, 19.8mm diameter mica window, α, β, γ
- ZP1430 – Halogen-quenched Geiger-Müller tube, 27.8mm diameter mica window, α, β, γ
- ZP1431 – Halogen-quenched Geiger-Müller tube, 27.8mm diameter mica window, β, γ
- ZP1441 – Halogen-quenched Geiger-Müller tube, 19.8mm diameter mica window, α, β, γ, for use with ZP1700
- ZP1451 – Halogen-quenched Geiger-Müller tube, 27.8mm diameter mica window, α, β, γ, for use with ZP1700
- ZP1490 – Halogen-quenched Geiger-Müller tube, 28mm diameter mica window, low-level α, β and γ
- ZP1600 – Halogen-quenched Geiger-Müller tube, 19.8 mm diameter mica window, X-rays, 6.0 to 20 keV energy, 60 to 200 pm wavelength range
- ZP1610 – Side window, Xenon-filled organically quenched Geiger-Müller tube. 7 × 18 mm mica window, X-rays, 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 – Halogen-quenched Geiger-Müller tube for use at temperatures up to 200 °C, γ
- ZP1810 – Halogen-quenched Geiger-Müller tube for use at temperatures up to 200 °C, γ, low sensitivity, up to 40 mGy/h
- ZP1860 – Halogen-quenched Geiger-Müller tube, β and γ
ZT
- ZT1000 = 8270 – 21 kV, 10 A Mercury-vapor triode thyratron
- ZT1011 = XR1/1600A = 8063 – 1 kV, 1.6 kW Inert gas-filled triode thyratron with anode on top cap
ZX
- ZX1000 – 800 V, 1140 Apk, 13Aavg Ignitron
- ZX1051 – Water-cooled, 56 Aavg Ignitron
- ZX1052 – Water-cooled, 140 Aavg Ignitron
- ZX1053 – Water-cooled, 355 Aavg Ignitron
- ZX1060 – Water-cooled, 10 Aavg Ignitron
- ZX1061 – Water-cooled, 10 Aavg Ignitron
- ZX1062 – Water-cooled, 10 Aavg Ignitron
- ZX1063 – Water-cooled, 10 Aavg Ignitron
ZY
- ZY1000 (872B) – High voltage, half-wave mercury-vapor rectifier
- ZY1001 = 8008A – High voltage, half-wave mercury-vapor rectifier, 4-pin base with anode on top cap
- ZY1002 – High voltage, half-wave mercury-vapor rectifier, E40 Goliath Edison screw lamp base with anode on top cap
ZZ
- ZZ1000 = 8228 – 81 V Voltage-regulator tube, all-glass with 2 wire-ends
- ZZ1010 – 85 V Voltage-regulator tube
- ZZ1020 (Telefunken STV85-8) – 82 V Voltage-regulator tube with primer electrode, all-glass with 3 wire-ends
- ZZ1030 (STV500-0,1) – Quad 125 V Voltage-regulator tube, Noval base, used all series-connected to stabilize the dynode voltages of photomultipliers
- ZZ1031 – Quad Voltage-regulator tube, Noval base
- ZZ1040 (STV100-60Z) – 100 V Voltage-regulator tube with primer electrode
- ZZ1050 – 82 V Voltage-regulator tube, all-glass with 2 wire-ends
List of European transmitting tubes
Note: Typecode explained above.
B - Backward-wave amplifier
BA
- BA9/20 = 7635 – X-band, 20 mW, Forced-air cooled backward-wave oscillator
- BA16/10 = 7636 – Ku-band, 10 mW, Backward-wave oscillator
D - Rectifier incl. grid-controlled
DA
- DA04/5 – 400 V, 5 W Half-wave rectifier; triode TA04/5 without grid
- DA08/10 – 800 V, 10 W Half-wave rectifier; triode TA08/10 without grid
- DA1.5/75 – 1.5 kV, 75 W Half-wave rectifier; triode TA1.5/75 without grid
- DA12/24000 – 12 kV, 24 kW Water-cooled half-wave rectifier
DC
- DC1/50 – 1 kV, 2×37.5 mA Full-wave rectifier; DC1/60 with heater on 3-pin base and dual anode top cap
- DC1/60 – DC1/50 with heater and dual anode on 4-pin base
- DC2/200 – 2 kV, 2×50 mA Full-wave rectifier with dual anode top cap
DCG
- DCG1/125 – 1 kV, 125 mA Half-wave mercury-vapor rectifier with Edison screw lamp base and anode on top cap
- DCG4/1000G (866A) – Half-wave mercury-vapor rectifier
- DCG5/5000GB (872A) – Half-wave mercury-vapor rectifier
- DCG5/5000GS (8008A, ZY1001) – Half-wave mercury-vapor rectifier
- DCG6/18 (6693) – Half-wave mercury-vapor rectifier
- DCG9/20 (6508) – Half-wave mercury-vapor rectifier
- DCG12/30 (5870) – 12 kV, 2.5 A Grid-controlled, half-wave mercury-vapor rectifier with anode on top cap
DCX
- DCX4/1000 = 3B28 = STC 2G/402A – 4 kV, 1 kW Half-wave xenon rectifier with anode on top cap
- DCX4/5000 = 4B32 = STC 2G/472B – 4 kV, 5 kW Half-wave xenon rectifier with anode on top cap
DE
- DE2/200 – 2 kV, 2×50 mA Full-wave rectifier with dual anode top cap
J - Magnetron
JNT
- JNT1/500 – 1.22 to 1.35 GHz, 600 kW Forced-air cooled, external-magnet, mechanically tunable, pulsed L-band Magnetron
JP
- JP8/02B – 8.8 GHz, 25 W Forced-air cooled, pulsed Magnetron used in airborne X-band Doppler radar systems
- JP9/15 – 9.345 to 9.405 GHz, 15 kW Forced-air cooled Magnetron for pulsed service
JPG
- JPG9/01 – 9.15 to 9.60 GHz, 5 W Forced-air cooled, mechanically tunable Magnetron
JPT
- JPT9/01 – JPG9/01 with a different mechanical tuning arrangement
K - Klystron
KB
KS
- KS6/1000x, KS7/1000x (YK114x) – 5.9 to 8.1 GHz, 1.2 W Reflex Klystrons
- KS7/85 – 6.5 to 7.5 GHz, 85 mW Reflex Klystron
- KS9/20 = 723A/B (2K25) – 8.7 to 9.5 GHz, 20 mW Reflex Klystron
- KS9/30 (6975) – 8.5 to 9.6 GHz, 30 mW Reflex Klystron
- KS9/40 – 9.3 to 9.5 GHz, 40 mW Reflex Klystron
L - Traveling-wave tube
LA
- LA4/250 = 7637 – 3.6 to 4.2 GHz, 200 mW Forward-wave amplifier
- LA9/3 = 7638 – 7 to 11.5 GHz, 6 mW Forward-wave amplifier
- LA16/2 = 7639 – 11.5 to 18 GHz, 3 mW Forward-wave amplifier
LB
- LB4/8 – 3.8 to 4.2 GHz, 8 W Forward-wave amplifier
- LB6/12 – 6 GHz, 12 W Forward-wave amplifier
- LB6/25 – 5.9 to 6.5 GHz, 25 W Forward-wave amplifier
M - AF amplifier/modulator triode
MA
- MA4/500 – 4 kV, 500 W Radiation-cooled AF power triode
- MA4/600 – 4 kV, 600 W Radiation-cooled AF power triode
- MA6/300 – 6 kV, 300 W Radiation-cooled AF power triode
- MA10/200 – 10 kV, 200 W Radiation-cooled AF power triode
- MA10/1000 – 10 kV, 1 kW Radiation-cooled AF power triode
- MA12/15 = MA12/15000 (Water-cooled), MAL12/15 (Forced-air cooled) – 12 kV, 15 kW AF Power triode
MB
- MB1/50 – 1 kV, 50 W Radiation-cooled AF power triode
- MB2/200 – 2 kV, 200 W Radiation-cooled AF power triode
MC
- MC1/50 – 1 kV, 50 W Radiation-cooled AF power triode
- MC1/60 – 1 kV, 60 W Radiation-cooled AF power triode
- MC2/200 – 2 kV, 200 W Radiation-cooled AF power triode
- MC2,5/75 – 2.5 kV, 75 W Radiation-cooled AF power triode
MY
- MY3/275 – 3 kV, 275 W Radiation-cooled AF power triode
MZ
- MZ05/20 – 500 V, 20 W Radiation-cooled AF power triode
- MZ05/60 – 500 V, 60 W Radiation-cooled AF power triode
- MZ1/75 – 1 kV, 75 W Radiation-cooled AF power triode
- MZ1/100 – 1 kV, 100 W Radiation-cooled AF power triode
- MZ2/200 – 2 kV, 200 W Radiation-cooled AF power triode
- MZ2/250 – 2 kV, 250 W Radiation-cooled AF power triode
P - Pentode
PA
- PA12/15 – 15 kW Water-cooled shortwave power pentode
- PA12/20 – 20 kW Water-cooled power pentode made by Philips and used in the 1930s and 1940s
PAL
- PAL12/15 – Forced-air cooled variant of PAW12/15
PAW
- PAW12/15 – 15 kW Water-cooled shortwave power pentode
PB
- PB2/200 – 200 W Shortwave power pentode
- PB3/1000 – 1 kW Shortwave power pentode
PC
- PC03/3 – 3 W Shortwave power pentode
- PC3/1000 – 1 kW Shortwave power pentode
PE
- PE04/10 – 10 W Shortwave power pentode
- PE1/100 (6083, YL1200) – 100 W Shortwave power pentode
Q - Tetrode
QB
- QB2/75 – 75 W Beam power tetrode
- QB2/250 (813) – Beam power tetrode
- QB3/200 (8165, Eimac 4-65A) – Beam power tetrode, 5-pin Septar base with anode on top cap
- QB3/300 (6155, 4D21, Eimac 4-125A) – Beam power tetrode
- QB3.5/750 (6156, 5D22, Eimac 4-250A) – Beam power tetrode
- QB4/1100 (7527) – Beam power tetrode
- QB5/1750 (6179) – Beam power tetrode
- QB5/2000 – 2 kW Beam power tetrode
QBL
- QBL4/800 (Eimac 4X500A) – Forced-air cooled 800 W beam power tetrode
- QBL5/3500 (6076) – Forced-air cooled 3500 W beam power tetrode
QBW
- QBW5/3500 (6075) – Water-cooled 3500 W beam power tetrode
QC
- QC05/15 – 15 W Beam power tetrode
- QC05/35 (8042) – 35 W Beam power tetrode
QE
- QE04/10 – 10 W Beam power tetrode
- QE05/40 (6146) – 40 W Radiation-cooled beam power tetrode, popular amongst radio amateurs as a final RF amplifier
- QE06/50 (807) – 50 W Radiation-cooled beam power tetrode
- QE08/200 (7378) – 200 W Beam power tetrode
QEL
- QEL1/150 = 7034 = Eimac 4X150A – Forced-air cooled 150 W beam power tetrode
- QEL1/250 – Forced-air cooled 250 W beam power tetrode
QEP
- QEP20/18 – 18 W Beam power tetrode for use as a pulse modulator
QQC
- QQC03/14 (7983) – 14 W Dual beam power tetrode
- QQC04/15 (5895) – Dual beam power tetrode
QQE
- QQE02/5 (6939) – 5 W Dual beam power tetrode
- QQE03/12 (6360) – 12 W Dual beam power tetrode
- QQE03/20 (6252) – 20 W Dual beam power tetrode
- QQE04/5 (7377) – 5 W Dual beam power tetrode
- QQE04/20 (832A) – Dual beam power tetrode
- QQE06/40 (5894, YL1060) – 40 W dual beam power tetrode, internally neutralized, Septar base with dual anode top cap
QQV
- QQV02/6 – 6 W Dual beam power tetrode
- QQV03/20A – 20 W Radiation-cooled dual tetrode made by Mullard and used in the 1940s, 1950s and 1960s as a VHF frequency-doubling output stage with balanced output
- QQV07/50 – 50 W Dual beam power tetrode
QQZ
- QQZ03/20 (8118, YL1020) – 20 W Dual beam power tetrode
- QQZ06/40 (YL1030) – 40 W Dual beam power tetrode
QV
- QV04/7 – 7 W Beam power tetrode
- QV05/25 (807) – 25 W Radiation-cooled beam power tetrode made by Mullard
- QV2/250C – 250 W Beam power tetrode
QY
- QY3/65 – 65 W Beam power tetrode
- QY5/3000A – 3 kW Beam power tetrode
- QY5/3000W – Water-cooled variant of QY5-3000A
QYS
- QYS50/P40 – Pulsed 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
QZ
- QZ06/20 – 25 W VHF power tetrode up to 175 MHz
R - Telefunken legacy rectifier incl. grid-controlled
RG
- RG1000/3000 – 1 kV, 3 A Half-wave mercury-vapor rectifier with anode on top cap[260]
- RG4/1250 = EnglishElectricValve AH221 = M-O GU21 – Half-wave mercury-vapor rectifier, E40 Goliath Edison screw lamp base
RGQ
- RGQ7.5/0.6 – 7.5 kV, 600 mA Half-wave mercury-vapor rectifier with anode on top cap[261]
- RGQ20/5 – 20 kV, 5 A Half-wave mercury-vapor rectifier with anode on top cap
RGQZ
- RGQZ1.4/0.4 – 1.4 kV, 400 mA Full-wave mercury-vapor rectifier
RR
- RR3/1250 – 3.1 kV, 1.25 A Half-wave inert-gas filled rectifier with anode on top cap[260]
RSQ
- RSQ7.5/0.6 – 7.5 kV, 600 mA Grid-controlled, half-wave mercury-vapor rectifier with anode on top cap[261]
- RSQ15/40 – 15 kV, 40 A Grid-controlled, half-wave mercury-vapor rectifier with anode on top cap
RY
- RY12/100 – 12.5 kV, 100 mA Half-wave vacuum rectifier with anode on top cap[260]
T - RF amplifier/oscillator triode
TA
- TA04/5 – 400 V, 50 W Radiation-cooled power triode
- TA08/10 – 800 V, 100 W Radiation-cooled power triode
- TA1.5/75 – 1.5 kV, 75 W Radiation-cooled power triode
- TA4/2000K – 4 kV, 2 kW Forced-air cooled power triode made by Philips in the 1930s
- TA18/100000 – 18 kV, 100 kW Water-cooled power triode
TAL
- TAL12/10 – 12 kV, 10 kW Forced-air cooled power triode
- TAL12/20 – 12 kV, 20 kW Forced-air cooled power triode
- TAL12/35 – 12 kV, 35 kW Forced-air cooled power triode
TAW
- TAW12/10 – 12 kV, 10 kW Water-cooled power triode
- TAW12/20 – 12 kV, 20 kW Water-cooled power triode
- TAW12/35G – 12 kV, 35 kW Water-cooled power triode, 3-phase filaments
TB
- TB04/8 – Directly heated Doorknob VHF power triode up to 600 MHz
- TB2.5/400 (7986) – 2.5 kV, 300 W Radiation-cooled power triode
- TB3/750 (5867) – Radiation-cooled power triode
- TB4/1250 (5868) – Radiation-cooled power triode
- TB4/1500 (8078) – Radiation-cooled power triode
- TB5/2500 (7092) – 5 kV, 2.5 kW Radiation-cooled power triode
TBH
- TBH6/14 – 6 kV, 14 kW Water/helix-cooled power triode
- TBH6/6000 – 6 kV, 6 kW Water/helix-cooled power triode
- TBH7/8000 – 7 kV, 8 kW Water/helix-cooled power triode
- TBH7/9000 – 7 kV, 9 kW Water/helix-cooled power triode
- TBH12/25 – 12 kV, 25 kW Water/helix-cooled power triode
- TBH12/38 – 12 kV, 38 kW Water/helix-cooled power triode
TBL
- TBL2/300 (7004) – 2 kV, 300 W Forced-air cooled power triode
- TBL6/14 (7804) – Forced-air cooled power triode
- TBL6/4000 (7753) – Forced-air cooled power triode
- TBL6/6000 (5924) – Forced-air cooled power triode
- TBL7/8000 (6961) – Forced-air cooled power triode
- TBL12/25 (6618) – Forced-air cooled power triode
- TBL12/38 (7806) – Forced-air cooled power triode
- TBL12/100 (6078) – Forced-air cooled power triode
- TBL15/125 – 15 kV, 125 kW Forced-air cooled power triode; TBL12/100 with 3-phase filaments
TBW
- TBW6/14 (7805) – 6 kV, 14 kW Water-cooled power triode
- TBW6/6000 (5923) – Water-cooled power triode
- TBW7/8000 (6960) – Water-cooled power triode
- TBW12/25 (6617) – Water-cooled power triode
- TBW12/38 (7807) – Water-cooled power triode
- TBW12/100 (6077) – Water-cooled power triode
- TBW15/125 – 15 kV, 125 kW Water-cooled power triode; TBW12/100 with 3-phase filaments
TC
- TC03/5 – RF power triode up to 85 MHz, 5 W
- TC2/250 – RF power triode up to 20 MHz, 250 W
TD
- TD03/5 – Indirectly heated disk-seal UHF power triode up to 2 GHz
- TD03/10 – Indirectly heated disk-seal UHF power triode up to 2.8 W, 3.75 GHz
- TD03/10F – TD03/10 with internal feedback for use as an oscillator
- TD04/20 – Indirectly heated disk-seal UHF power triode up to 13.5 W, 1 GHz
- TD1/100C (2C39BA) – Indirectly heated, ceramic disk-seal UHF power triode up to 24 W, 3.5 GHz[262]
- TD2/400 – Directly heated, ceramic disk-seal UHF power triode up to 600 W, 900 MHz
- TD2/500 – Directly heated, ceramic disk-seal UHF power triode up to 500 W, 940 MHz
TE
- TE05/10 – RF power triode up to 150 MHz
TX
- TX12/12W – Water-cooled RF power triode
- TX12/20W – Water-cooled RF power triode
- TX10/4000 – Power triode, Silica envelope, 12 kV anode voltage, 4 kW anode dissipation, 1.6 A cathode current, gm: 4.5 mS, for use as self-excited high-power oscillator in induction heating equipment
TY
- TY2/125 – 135 W VHF power triode up to 200 MHz
- TY12/50A – Forced-air cooled 45 kW RF power triode up to 30 MHz
- TY12/50W – Water-cooled 50 kW RF power triode up to 30 MHz
TYS
- TYS2/250 – Power triode, Silica envelope, 2.5 kV anode voltage, 250 W anode dissipation
- TYS4/500 – Power triode, Silica envelope
- TYS5/1000 – Power triode, Silica envelope
- TYS5/2000 – Power triode, Silica envelope
- TYS5/3000 – Power triode, Silica envelope, 6 kV anode voltage, 950 °C anode temperature at 3.5 kW anode dissipation, 2.8 A cathode current, gm: 15 mS. Used in RF generators for induction hardening
X - Thyratron
XG
- XG1/2500 – 1 kV, 2.5 A Mercury-vapor triode thyratron with anode on top cap
- XG2/6400 – 2.5 kV, 6.4 A Mercury-vapor triode thyratron with anode on top cap
XGQ
- XGQ2/6400 – 2 kV, 6.4 A Mercury-vapor tetrode thyratron with anode and #1 grid top caps
XH
- XH3/045 (3C45) – 3 kV, 45 mA Hydrogen triode thyratron with anode on top cap
- XH8/100 (4C45) – 8 kV, 100 mA Hydrogen triode thyratron with anode on top cap
XR
- XR1/1600 (5545) – 1 kV, 1.6 A Inert gas-filled triode thyratron with anode on top cap
- XR1/1600A = ZT1011 = 8063 – Improved XR1/1600
- XR1/3200A = 7981 – 1.5 kV, 3.2 A Inert gas-filled triode thyratron with anode on top cap
- XR1/6400 – 1 kV, 6.4 A Inert gas-filled triode thyratron with anode on top cap
List of other tubes since c. 1935
1
- 131QP55 (blue-green, very short persistence), 131QP56 (blue-violet, very short) – CRT-type flying-spot scanners for use in a telecine
- 175HQ – Ultra high reliability pentode for use in long-haul submarine communications cable repeaters[263]
1600s
- 1602 – Directly heated low-microphonics AF power triode, 7.5 V filament, 12 watts of AF operating in Class-A, 15 watts of low RF operating in Class-C; similar to type 10
- 1603 – Indirectly heated low-microphonics, noise, and hum, AF pentode, 6.3 V/300 mA heater, UX6 base; similar to types 57, 6C6, 6D6 and 6U7
- 1608 – Directly heated power triode giving 20 watts at up to 45 MHz, 2.5 V/2.5 A filament, UX4 base; similar to type 801
- 1609 – Directly heated low-microphonics AF pentode, 1.1 V/250 mA filament, UY5 base
- 1610 – Directly heated pentode specially designed for use as a crystal oscillator, 2.5 V/1.75 A filament, American 5-pin base
- 1611 – Power pentode for use in maritime, automatic SOS transmitters; 6F6 with tightened specs
- 1612 – Heptode pentagrid converter, both control grids #1 and #3 are sharp-cutoff; low-microphonics version of type 6L7
- 1613 – 17.5 W Indirectly heated RF power pentode, 6.3 V/700 mA heater, Octal base
- 1614 – 21 W Indirectly heated RF beam power tetrode, 6.3 V/900 mA heater, Octal base
- 1616 – 6.5 kV, 130 mA Half-wave rectifier, UX4 base with anode on top cap
- 1619 – RF Beam power tetrode, 2.5 V/2 A filament, Octal base, common in World War II battle tank transmitters; similar to type 6L6 but directly heated
- 1620 – Indirectly heated low-microphonics AF pentode, 6.3 V/300 mA heater, Octal base; very similar to type 6J7
- 1621 – 8.3 W Indirectly heated AF power pentode, 6.3 V/700 mA heater, Octal base; long-life version of the 6F6
- 1622 – 13.8 W Indirectly heated AF beam power tetrode, 6.3 V/900 mA heater, Octal base; long-life version of the 6L6
- 1623 – 25 W Directly heated power triode, 6.3 V/2.5 A filament, UX4 base; similar to type 809
- 1624 (2.5 V/2 A heater), 1625 (12.6 V/450 mA heater) – Beam power tetrode; very similar to type 807, but with different heaters
- 1625 – Indirectly heated RF beam power tetrode, 12.6 V/450 mA heater, low loss mica-filled phenolic resin ("Micanol")[13] Octal base with anode on top cap; very similar to type 807
- 1626 – RF power triode; very similar to type 6J5 but with a 12.6 V/250 mA heater
- 1629 – Tuning indicator tube with DC amplifier triode unit; 6E5 with an Octal base and a 12.6 V/150 mA heater
- 1630 – Indirectly heated, orbital-beam, secondary-emission, 12-pin Jumbo Acorn-type UHF hexode, 6.3 V/300 mA heater
- 1631 – 16 W Indirectly heated AF beam power tetrode, 6.3 V/450 mA heater; 6L6 with tightened specs
- 1632 – 5.5 W Indirectly heated AF beam power tetrode, 12.6 V/600 mA heater; 25L6 with tightened specs
- 1633 – Separate cathodes dual triode, Octal base, used in World War II aircraft; 6SN7 with a 25 V/150 mA heater
- 1634 – Common cathode dual triode; 12SC7 with tightened specs
- 1635 – Indirectly heated, 10.4 W common cathode dual AF power triode, 6.3 V/600 mA heater, Octal base
- 1636 – Secondary emission UHF beam deflection tube, used as a balanced mixer up to 600 MHz[264]
- 1640 = 6405 – Gas-filled, low-microphonics phototube, caesium-coated cathode with spectral S1 response (red/infrared, maximum sensitivity at 800 nm), 4-pin base, for industrial applications such as electronic bottle/ampoule inspection equipment
- 1642 = 2C21 – Separate cathodes dual RF triode, "Micanol" 7-pin base, one grid on top cap
- 1644 – Dual power pentode; 12L8GT with tightened specs
- 1650 – High-altitude version of the 955 Acorn-type triode
- 1654 – 7 kV, 1 mA Half-wave rectifier, Miniature 7-pin base with anode on top cap
- 1680 – Dual-control heptode for use as a NAND gate in a coincidence circuit in IBM computers; 6BE6/EK90 with a sharp-cutoff #3 grid
- 1699 – Indirectly heated hexode monoscope, 6-pin base with dual top caps for #4 grid and anode; 2F21 with a customer-supplied test pattern
2
- 20TC4, 30TC1 – Tacitron; cf. 6441, EC860
- 24B1 – Trigatron
- 24B9 – Trigatron
- 29C1 – 100 V, 3 mA Directly heated, thermally-limited (=saturated) emission diode, 4 V/800 mAmax uncoated tungsten filament, for use as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits; cf. 5845, YA1000
200s
Notes:
- For the Cossor 200-series see above
- Second sourced by STC as 4200s
- See also under List of other tubes c. 1925–35
- 203A – 100 W, Directly heated RF power triode, 4-pin base[265]
- 204A – 250 W, Directly heated RF power triode, 3-pin base, anode on top cap[266]
- 205D/E/F – 14 W, Directly heated AF or modulator power triode, 4.5 V/1.6 A filament, 4-pin base[267]
- 207 – 10 kW, Water-cooled, directly heated RF power triode[268]
- 211/B/C/D – 100 W, Directly heated AF or modulator power triode now favored by audiophiles, Jumbo 4-pin base[269]
- 212D (200 W), 212E (275 W) – Directly heated RF power triode, 4-pin base[270]
- 217C – Directly heated half-wave vacuum rectifier
- 220B – 10 kW, Water-cooled, directly heated AF/modulator power triode[271] (not to be confused with the Cossor 220B dual power triode)
- 228A – 5 kW, Water-cooled, directly heated RF/AF power triode[272]
- 231D, 257A (control grid on top cap) – Directly heated AF triode, 3.1 V/60 mA filament, 4-pin base[273]
- 232B/C – 25 kW, Water-cooled, directly heated RF power triode[274]
- 236A – 20 kW, Water-cooled, directly heated RF power triode[275]
- 240A/B – 10 kW, Water-cooled, directly heated RF power triode[276] (not to be confused with the Cossor 240B dual power triode)
- 241B – 275 W, Directly heated RF/AF/modulator power triode, 3-pin base, anode on top cap[277]
- 242A/B/C – 85 W, Directly heated AF/modulator power triode, 4-pin base[278]
- 244A, 247A – Indirectly heated, low-power AF triode, 2 V/1.6 A heater, 5-pin base[279]
- 245A – Indirectly heated RF/AF tetrode, 2 V/1.6 A heater, 5-pin base, control grid on top cap[280]
- 246A – Directly heated RF/AF tetrode, 3.3 V/100 mA filament, 4-pin base, control grid on top cap[281]
- 250TH (High-μ), 250TL (Low-μ) – 250 W, Directly heated AF/modulator power triode, 4-pin base, anode on top cap[282]
- 251A – 1 kW, Directly heated AF/modulator power triode, special wall mount construction[283]
- 252A – Directly heated AF power triode, 4-pin base[284]
- 254A/B – 20 W, Directly heated RF power triode, 4-pin base, anode on top cap[285]
- 256A – 325 V, 75 mA Argon thyratron, 5-pin base[286]
- 259A/B (Sharp-cutoff), 283A (Remote-cutoff) – Indirectly heated RF/AF tetrode, 2 V/1 A heater, 5-pin base, control grid on top cap[287]
- 260A – 100 W Directly heated RF power tetrode, 4-pin base, control grid and anode on lateral and top wires[288]
- 261A – 125 W, Directly heated AF/modulator power triode, 4-pin base[289]
- 262A/B (4-pin base), 347B (Octal base) – Indirectly heated AF power triode, control grid on top cap[290]
- 264A/B/C – Directly heated low-microphonics AF triode, 1.5 V/300 mA filament, 4-pin base[291]
- 267B (2-pin base), 319A (4-pin base) – Directly heated half-wave vacuum rectifiers, anode on top cap[292]
- 268A – 25 W, Directly heated power triode, 4-pin base, anode on top cap[293]
- 269A – 275 V, 20 mA Argon thyratron, 4-pin base[294]
- 270A – 350 W, Directly heated AF/RF power triode, 4-pin base, anode on top cap[295]
- 271A – Directly heated AF power triode, 5-pin base[296]
- 272A – Indirectly heated, low-power AF triode, 10 V/320 mA heater, 5-pin base[297]
- 275A – 17 W, Directly heated AF power triode, 4-pin base[298]
- 276A – 125 W, Directly heated AF/RF power triode, 4-pin base[299]
- 277A – 350 V, 500 mA Argon thyratron, 5-pin base[300]
- 278A – 800 W Directly heated RF power tetrode, special wall mount construction[301]
- 279A (Western Electric, Machlett Labs), 379A (ML) – 1.2 kW, Directly heated AF/RF power triode, special wall mount construction[302]
- 281A – Directly heated moderate-power AF tetrode with a space charge grid, 5 V/1.6 A filament, 5-pin base[303]
- 282A – 70 W Directly heated RF power tetrode, 4-pin base, anode on top cap[304]
- 284A/D – 85 W, Directly heated RF/AF/modulator power triode, 4-pin base[305]
- 285A – Low-power AF pentode, 2 V/1 A heater, 5-pin base[306]
- 286A – Remote-cutoff IF/AF pentode, 6-pin base, control grid on top cap[307]
- 287A – 1.5 A Mercury-vapor Thyratron[308]
- 293A – AF Power pentode, 10 V/320 mA heater, 6-pin base[309] (not to be confused with the 293 Triple-Twin)
- 295A – 100 W, Directly heated AF/RF power triode, 4-pin base[310] (not to be confused with the 295 Triple-Twin)
- 297A – 250 V, 10 mA Argon thyratron, 4-pin base[311]
- 298A/B – 100 kW, Water-cooled, directly heated power triode[312]
3
300s
Second sourced by STC as 4300s
- 300A – 40 W Directly heated AF power triode, 5 V/1.2 A filament, 4-pin base[313]
- 300B – 36 W version of the 300A, 4-pin base with the lateral bayonet pin rotated by 45° [314] so it could replace the 205A
- 301A – 1.8 kV, 1 A Full-wave Mercury-vapor rectifier, 4-pin base[315]
- 303A – Indirectly heated dual diode + triode, 6-pin base[316]
- 304B – 50 W, 300 MHz Directly heated VHF power triode, 4-pin base, anode and grid on top wires[317]
- 305A – 60 W, 50 MHz Directly heated VHF power tetrode, 4-pin base, anode and both grids on top wires[318]
- 306A – 15 W Directly heated RF/AF power pentode, 4-pin base, suppressor grid internally tied to filament center-tap, control grid on top cap[319]
- 307A – 15 W Directly heated RF/AF power pentode, 5-pin base, anode on top cap[320]
- 308B – 250 W Directly heated AF power triode, 14 V/6 A filament, 4-pin base[321]
- 309A – Remote-cutoff IF/AF pentode, 5-pin base, control grid on top cap[322]
- 310B – Sharp-cutoff RF/AF pentode, 10 V/320 mA heater