(PDF) (PDF) (PDF)Forked from here, with bold letters in section titles from here, and some 1950's Mullard-Philips and RMA-designated semiconductors from here.
Colored all intra-article wikilinks green - resulting in this reference wikitext
Content changes from there:
====[[Philips]] systems====In 1923, Philips introduced their ''Miniwatt'' brand to indicate [[Hot cathode|''Dull Emitter'']] tubes<ref name="PhilipsHistoryTo1935">{{cite web |url=https://nvhrbiblio.nl/biblio/boek/Stewart%20-%20Illustrated%20history%20of%20Philips%20radio%20valves%20to%201935.pdf |title=Illustrated history of Philips radio valves to 1935 |author=Stewart, Fin |year=1995 |access-date=15 May 2022}}</ref>=====Standard tubes 1925–34=====[[Philips]]:<ref name="PhilipsHistoryTo1935" />*'''1DZ''' = '''A''' – Directly heated triode, 4 V/250 mA filament, European candelabra bases on both ends, both argon-filled and high-vacuum version available at the time, named after [[Hanso Idzerda]]*'''B''' – Directly heated triode, 2 V/500 mA filament, both argon-filled and high-vacuum version available*'''BⅥ''' = '''B6''' (since 1925) – Directly heated [[Tetrode#Space charge grid tube|space charge grid]] tetrode, 1.7 V/150 mA filament; superseded by A241*'''C''' – Directly heated triode, 4 V/500 mA filament, both argon-filled ('''CⅠ''') and high-vacuum ('''CⅡ''') version available*'''DⅠ''' = '''D1''' (Gas-filled), '''DⅡ''' = '''D2''' (High-vacuum) – Directly heated triode, 3.5 V/500 mA filament, used in 1920s [[Tuned radio frequency receiver|TRF]] and [[Regenerative circuit|regenerative]] radios*'''DⅢ''' = '''D3''' – '''DⅡ''' with a 3.0 V/500 mA filament, designed as an equivalent to the Telefunken RE11*'''DⅣ''' = '''D4''' (Gas-filled), '''DⅤ''' = '''D5''' (High-vacuum) – Directly heated triode, 3.5 V/500 mA filament, short-pin UV-style base for use in American equipment*'''F''' = '''ZⅠ''' – Directly heated power triode, 3.8 V/1.4 A filament, derived from the '''E''' tube*'''Q''' = '''DⅥ''' = '''D6''' – Directly heated space charge grid tetrode, 3.5 V/500 mA filament*'''18503''' = [[#ZP|{{color|Green|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*'''EF59''' – RF pentode, B9G 9-pin Loctal base*'''ZP1200''', '''ZP1210''', '''ZP1220''' – Halogen-quenched Geiger-Müller tube, γ*'''ZP1300''', '''ZP1310''' – Halogen-quenched Geiger-Müller tube, γ and high-energy (>500 [[Electronvolt|keV]]) β*'''ZP1320''' – Halogen-quenched Geiger-Müller tube, γ and high-energy (>250 keV) β*'''ZP1410''' – Halogen-quenched Geiger-Müller tube, 19.8mm diameter mica window, [[Alpha particle|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:*'''LM''' – ''Octalox'' (=Loctal) base, metal envelope:*'''LT''' – ''Octalox'' base, glass tubular envelope====={{anchor|PhilipsNumeral}}Numeral system=====Philips also used a numeral-only system for special tubes:*'''1000''' to '''1899''' – Rectifier:*'''1700'''s – [[Rectifier#Plasma type|Gas-discharge]] or [[Mercury-arc valve|mercury-vapor]] rectifier:*'''1800'''s – High-vacuum rectifier*'''1900'''s – [[Iron–hydrogen resistor|Barretter]]*'''3500'''s – [[Phototube]] or [[Photomultiplier tube|photomultiplier]]*'''4000'''s – Misc.*'''18000''' to '''18099''' – [[Repeater#Telephone repeater|Telephone repeater]] triode or pentode*'''18100'''s – [[Image intensifier]] or [[X-ray image intensifier|image converter]]*'''18500'''s – [[Gaseous ionization detector|Radiation detector tube]] ([[Geiger–Müller tube|Geiger-Müller counter tube]] or [[Proportional counter|proportional counter tube]])*'''20610''' to '''28216''' – [[X-ray tube]]*'''55000''' to '''55399''' – Microwave tube*'''55800'''s – [[Video camera tube]]*'''56000'''s – Misc.{{anchor|PhilipsNumeralEx}}'''Examples:'''*'''1927''' (40 to 120 V filament for 110VDC mains), '''1928''' (80 to 240 V filament for 220VDC mains) – Barretters for use with [[#180mADC|{{color|Green|180mADC}}]] tube sets<ref name="PhilipsFeH" />*'''3520''' – Early photomultiplier, 3-stage, [[Caesium]]-on-[[silver oxide|oxidated-silver]] [[photocathode]], spectral S1 response, side-contact 8 base*'''4000'''s – [[#4000Philips|{{color|Green|See below}}]]*'''56001''' – Directly heated, 300 V, 400 µA [[Thermionic emission|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 [[True RMS converter|RMS heating current-to-DC anode current converter]]; cf. 5845, Tesla RA0007, YA1000*'''{{Visible anchor|56006}}''' – ''Omegatron'' [[Mass spectrometry|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 angular velocity depending on the ion mass. An electrode inside the cavity floods it with RF energy 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<ref>[https://frank.pocnet.net/sheets/009/5/56006.pdf 56006 data sheet] • [http://lampes-et-tubes.info/sp/sp091.php?l=e on Lampes-et-tubes]</ref>*'''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 [[Cavity magnetron|Magnetron]], driving the tube into cut-off with a sensitivity of -2 mA/[[Gauss (unit)|G]] (-20 mA/[[Tesla (unit)|mT]]), Octal base<ref>[http://lampes-et-tubes.info/sp/2B23.pdf 2B23 data sheet] • [http://lampes-et-tubes.info/sp/sp025.php?l=e on Lampes-et-tubes]</ref>:*'''EBF2G''', '''EBF2G/GT''' – EBF2 with an Octal base, heater between nonstandard pins 1 and 8*'''EBF32''' (6B8) – EBF2G with heater between standard pins 2 and 7*'''EBF35''' – EBF2G with different cathode, g3 and shield connections on pins 2 and 7:*'''ECH3G''' – ECH3 with an Octal base:*'''ECH4G''' – ECH4 with an Octal base*'''ECH33''' = ECH3G*'''ECH34''' = ECH4G:*'''EK2G''' – EK2 with an Octal base*'''EK32''' = EK2G:*'''KF3G''' – KF3 with an Octal base:*'''KK2G''' – KK2 with an Octal base*'''KK32''' = KK2G:*'''KL4G''' – KL4 with an Octal base[[Philips]]:*'''820B''' – Water-cooled RF power triode, 11 V/34 A filament<ref name="SylvaniaTT1934">{{cite web |url=http://www.tubecollectors.org/archives/sylvania1934.pdf |publisher=[[Sylvania Electric Products|Hygrade Sylvania]] |title=Sylvania Transmitting Tubes |year=1934 |access-date=27 December 2021}}</ref>*'''863''' – Water-cooled RF power triode, 11 V/52 A filament<ref name="SylvaniaTT1934" />*'''867''' – 1 kV, 600 mA Grid-controlled, half-wave mercury-vapor rectifier<ref name="SylvaniaTT1934" />*'''873''' – 1 kV, 2.5 A Grid-controlled, half-wave mercury-vapor rectifier<ref name="SylvaniaTT1934" />*'''PL5''' – 1.5 kV, 3.5 A<sub>avg</sub>, 100 A<sub>peak</sub> ''Sendytron'',<sup>([[:de:Senditron|de]])</sup> a Mercury-vapor thyratron with an auxiliary anode and capacitive ignition by an isolated control rod dipping into the cathode pool<ref>{{cite web |url=https://frank.pocnet.net/sheets/030/p/PL5.pdf |title=PL5 data sheet |date=10 October 1954 |publisher=[[Philips]] |access-date=16 December 2021}}</ref><ref>{{cite web |url=http://electron-tubes.info/iz/SENDITRON.pdf |title=The construction of a gas-discharge tube |access-date=16 December 2021}}</ref>*'''PL10''' – 400 V, 100 mA<sub>avg</sub>, 4 A<sub>peak</sub> Mercury-vapor thyratron with external capacitive ignition[[Sylvania Electric Products|Sylvania]]:*'''SY1301(A)''' – ''Omegatron'' [[Mass spectrometry|Mass spectrometer]] tube, [[Pyrex|Nonex glass]] envelope;<ref>[https://frank.pocnet.net/sheets/168/s/SY1301.pdf SY1301 data sheet]</ref> see Philips [[#56006|{{color|Green|56006}}]]*'''РМО-4С''' ⟼ '''RMO-4S''' – ''Omegatron'' [[Mass spectrometry|Mass spectrometer]] tube;<ref>[http://lampes-et-tubes.info/sp/RMO-4S.pdf Омегатронная лампа типа РМО-4С data sheet] • on [http://lampes-et-tubes.info/sp/sp092.php?l=e Lampes-et-tubes]</ref> see Philips [[#56006|{{color|Green|56006}}]]:*'''1–9''' – Sequentially assigned, comprising most base types popular in 1934–37:::*P8A Side-contact 8 (near-exclusive since 1937):*'''10–19''' – Y8A ''Steel tube'' 8-pin (introduced in 1937)::—Before 1942:::*K8A Octal with filament between pins 1 and 8 {{small|(DAC21, DBC21, DCH21, DF21, DF22, DK21, DL21, DLL21, DM21)}}:*'''30–39''' – K8A [[Tube socket#Octal|Octal]] with filament/heater between standard pins 2 and 7::—Before 1947:*'''2C21''' – Separate cathodes dual RF triode, indirectly heated, [[Dielectric loss|low loss]] [[mica]]-filled [[Phenol formaldehyde resin|phenolic resin]] ("Micanol")<ref name="Micanol" /> 7-pin base, one grid on top cap*'''2C50''' – Separate cathodes dual triode, indirectly heated, Octal base, for use in [[Servomechanism|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 top cap*'''3C33''' – Common cathode dual power triode for use in [[Zero crossing control|burst-]] or [[Phase-fired controller|phase-fired]] controllers, ''Septar'' 7-pin base*'''3C45''' = '''6130''' – 45 mAavg, 1.5 A[[Root mean square|RMS]], 35 Apeak, Half-indirectly heated hydrogen triode thyratron, 4-pin base with anode top cap*'''E91AA/5726/6AL5W''' = '''EAA901S''' – RF Dual diode, Miniature 7-pin base, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''EC1000/8254''' – Triode for use as amplifier in [[Test probe|probes]], 8-pin all-glass pigtailed with grid on top wire, shock/vibration resistant*'''EC1030''' – Indirectly heated UHF triode, all-glass round cross-section body with 8 circular, tinned, 38 mm long wires, [[Hot spare#Hot standby operation of vacuum tubes|''hot-standby'']] resistant (no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|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*'''E86C''' = '''EC806S''' – UHF triode up to 800 MHz, dual anode and cathode pins and triple grid pins for use as [[Valve RF amplifier#Grounded grid amplifier|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*'''ECC2000''' – VHF separate cathodes, dual triode with neutralization screen, for use as cascode amplifier up to 300 MHz, Decal base with gold-plated pins, shock/vibration resistant*'''ECC8100''' – VHF separate cathodes, dual triode with neutralization screen ("''Neutrode''") connected to the heater, for use as cascode amplifier, Noval base, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|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''' = '''12AT7WA''' – 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*'''E82CC/6189''' = '''12AU7WA''' – Separate cathodes, dual triode for use as amplifier or multivibrator, center-tapped 12.6 V/300 mA (series) resp. 6.3 V/600 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant; premium version of ECC82/12AU7*'''E83CC/6681''' – Separate cathodes, low-microphonics dual triode, center-tapped 12.6 V/300 mA (series) resp. 6.3 V/600 mA (parallel) heater, Noval base, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant*'''E88CC/6922''' – Separate cathodes, dual triode, Noval base with gold-plated pins, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant*'''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, low-microphonics, dual triode for use as RF/IF/AF amplifier, Noval base, shock/vibration resistant*'''E283CC''' – Separate cathodes, low-hum, low-microphonics, dual triode for use as [[Valve audio amplifier|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*'''ECF8070''' – Triode + pentode, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]]*'''E80CF/7643''' – Triode + pentode, separate cathodes, no cathode poisoning after prolonged periods in cut-off, shock/vibration resistant*'''ECH8000''' – Triode/remote-cutoff heptode mixer, Noval base, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''ED8000''' – Power triode for use in series-pass voltage regulators, Noval base, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''EF8010''' – Remote-cutoff RF/IF pentode, no [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''E83F/6689''' – Long-life, wideband pentode for use in telephone equipment, gold-plated pins, long-life >10000h*'''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*'''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 [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|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*'''EH81''' – Heptode for use as FM detector*'''E81H''' – Heptode for use as FM detector*'''EH90/6CS6''' – Dual-control heptode for use as gated amplifier or combined sync sep/clipper in TV receivers*'''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 [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''EL5070/8608''' – Frame-grid, wideband video power pentode, Magnoval base*'''E80L/6227'''[[File:E80L pentode.jpg|100 px|thumb|right|E80L]] – 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 [[Hot cathode#Failure modes|cathode interface/poisoning]] after prolonged periods in [[Cut-off (electronics)#Tubes|cut-off]], shock/vibration resistant*'''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*'''E90Z/6063''' – Full-wave rectifier, Miniature 7-pin base, shock/vibration resistant*'''1634''' – Common cathode dual triode; 12SC7 with tightened specs*'''1642''' = '''2C21''' – Separate cathodes dual RF triode, "Micanol" 7-pin base, one grid on top cap===={{anchor|OEMW}}'''MW'''====[[Philips]]:*'''MW6-2''' ([[Black and white|B/W]] TV), '''MG6-2''', '''MU6-2''', '''MY6-2''' (Color TV), '''MV6-5''' (radar) – 55 mm (2") [[Rear-projection television|Rear-projection CRTs]], 25 kV anode voltage, magnetic deflection and focusing, V5A side-contact 5 base* [http://rca.vobj.org/ RCA Engineer archive]The RPY numbers are the equivalent under the later [[Pro Electron#Frequently used first letters in European active devices|''Pro Electron'' semiconductor designation system]]*'''D''' – Vacuum, mercury-vapor or xenon [[rectifier]] including grid-controlled types*'''M''' – AF Power triode for use as amplifier or [[Radio transmitter design#Plate AM modulators|modulator]]*'''P''' – Power pentode*'''Q''' – Power tetrode*'''R''' – Vacuum, mercury-vapor or inert-gas rectifier*'''T''' – RF Power triode for use as amplifier or oscillator*'''X''' – Hydrogen, mercury-vapor or inert-gas [[thyratron]]:—'''Reflex Klystrons:''' Output power in mW*'''ES''', '''ESA''', '''ESV''', '''ESW''' – Power triode*'''ESG''' – Power tetrode*'''ESU''', '''U''' – Half-wave high-vacuum or gas-filled rectifier*'''ES75''' ([[Gain (electronics)|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*'''Q''' – Special quality tube*'''12X4''' – Full-wave rectifier, Miniature 7-pin base; 6X4/EZ90 with a different heater*'''PCC806''' – Dual vari-μ frame-grid VHF triode for use as cascode amplifier<ref name="MazdaEdiSwan1970" />*'''PCF808''' – Frame-grid triode + pentode for use as RF amplifier and scanning oscillator in TV receivers, Noval base<ref name="MazdaEdiSwan1970" />*'''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*'''MC2,5/75''' – 2.5 kV, 75 W Radiation-cooled AF power triode*'''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*'''MZ2/250''' – 2 kV, 250 W Radiation-cooled AF power triode:*[[Second source]]d by STC as [[#4000STC|{{color|Green|4200s}}]][[Second source]]d by STC as [[#4000STC|{{color|Green|4300s}}]]*'''323A/B''' – 1.25 kV, 1.5 A Argon/Mercury-vapor thyratron, 5-pin base;<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/323B_WE_Datasheet.pdf |publisher=[[Western Electric]] |title=323B Vacuum Tube |year=1962 |access-date=12 June 2021}}</ref><ref name="WE287A_323A_354A_355A" />*'''355A''' – 4 A Argon/Mercury-vapor Thyratron<ref name="WE287A_323A_354A_355A" />*'''378A''' – 30 kV, 200 mA Directly heated half-wave rectifier, center-tapped filament, 4-pin base;<ref name="WE371A_378A" /> see 371A[[Edison and Swan Electric Light Company|Mazda/EdiSwan]] 4-volts AC, indirectly heated ("Mains Operated") receiver tubes with mostly [[#Cossor system|{{color|Green|Cossor}}]] and [[#Mullard designations before 1934|{{color|Green|Mullard}}]] function codes:*Radio Bygones, February/March 1991: Geoff Arnold: Radio Valves and Tubes - 1: [https://nzvrshome.files.wordpress.com/2019/07/valve-numbering-and-equivalents-radio-bygones.pdf Numbering Systems] ([https://rubli.net/valve_data/HTML/VALVENUM.HTM html])Besides their "4000" system with incorporated [[Western Electric]] 3-digit type numbers, [[Standard Telephones and Cables|STC]] used the following system:<ref>{{cite web |url=https://frank.pocnet.net/sheets/144/suppinfo/STC_1947_Standard_Valves.pdf |publisher=[[Standard Telephones and Cables|STC]] |title=STC Standard Valves |date=September 1947 |pages=36ff. |access-date=10 October 2021}}</ref>*A digit: 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''' – Flying leads:*'''J''' – Disk-seal tube:*'''K''' – Miniature baseFor '''examples''' [[#4000STC|{{color|Green|see below}}]]Besides [[#RETMA standard tubes system|{{color|Green|RETMA}}]], [[#EIA professional tubes system|{{color|Green|EIA}}]] and [[#Mullard–Philips system|{{color|Green|Mullard–Philips}}]] systems, Brimar ("'''''Bri'''tish '''M'''anufactured '''A'''merican '''R'''adio''" [tubes]) used the following system:<ref name="DecoderLinks" />*'''C4''' – 55 to 105 V filament with an ''Urdox'' power thermistor*'''C6''' – 75 to 150 V filament with an ''Urdox'' power thermistor*'''U30''' – 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*'''MA4/500''' – 4 kV, 500 W Radiation-cooled AF power triode*'''4060''' – Directly heated, [[electrometer]] ''Dual Plate'' (filament sandwiched between grid and anode)<ref>[https://www.radiomuseum.org/forum/dual_plate_triodes_a_review.html Dual Plate triodes on radiomuseum]</ref> planar triode, grid current ≤10 fA, 3-pin base with grid on top cap*'''4066''' – Directly heated electrometer tetrode, grid 2 current ≤2.5 fA, 5-pin all-glass pigtailed*'''4067''' – Directly heated electrometer pentode, grid 1 current ≤25 pA, inline 5-pin all-glass pigtailed, for use in [[pH meter]] probes*'''4068''' – Directly heated electrometer pentode, grid 1 current ≤3 fA, 5-pin all-glass pigtailed*'''4069''' – Directly heated electrometer triode, controlled logarithmic relationship between 3 pA...3 nA positive grid current and anode current, 5-pin all-glass pigtailed, for probe amplifiers*'''4357''' – 85 to 100 V, 10 to 40 mA Neon-filled voltage-regulator tube, European 4-pin base*'''4687''' – 85 to 100 V, 10 to 40 mA Neon-filled voltage-regulator tube, side-contact 8 base*'''4445''' – ''SpectraPlex'' [[Video camera tube#Vidicon|Vidicon]] for use in single-tube color video cameras, target overlaid with fine vertical yellow (=white - blue), and diagonal cyan (=white - red) [[dichroic filter]] stripes each separated by unfiltered stripes of equal width. The [[NTSC]]-format scanning beam sweeps over the alternately filtered and unfiltered stripes of the target, producing a normal baseband luminance (Y) signal plus a 5 MHz carrier amplitude-modulated with the "luminance - blue" (Y-B) [[YCbCr|component]] plus a 5 MHz × sin 45° = 3.58 MHz "luminance - red" (Y-R) carrier.<ref>[http://www.r-type.org/articles/art-244.htm Single Tube Colour Cameras]. I. R. Sinclair, Television, June 1973</ref><ref>The Saticon Camera Tube. David K. Matthewson, Television, May 1984 - [https://worldradiohistory.com/hd2/IDX-UK/Technology/Technology-All-Eras/Archive-Practical-Television-IDX/80s/Television-Servicing-UK-1984-05-OCR-Page-0027.pdf page 27], [https://worldradiohistory.com/hd2/IDX-UK/Technology/Technology-All-Eras/Archive-Practical-Television-IDX/80s/Television-Servicing-UK-1984-05-OCR-Page-0028.pdf page 28]</ref> The two carriers are demodulated and the [[RGB color model|RGB]] colors then calculated as {{Nowrap|R{{=}}Y-(Y-R)}}, {{Nowrap|G{{=}}Y-R-B}} and {{Nowrap|B{{=}}Y-(Y-B)}}*'''4470''' – [[Image intensifier]] + [[Video camera tube#Image orthicon|Image Orthicon]] combination*'''4471''', '''4472''' – 931 9-stage [[Photomultiplier tube|photomultipliers]] with controlled sensitivity above 580 nm*'''4473''' – 1P21 9-stage photomultiplier with controlled sensitivity above 580 nm*'''150AV''' – Vacuum photometric cell, blue sensitive*'''150CV''' – Vacuum photometric cell, Red/IR sensitive*'''150UV''' – Vacuum photometric cell, Blue/UV sensitive*'''155UG''' – Gas-filled, cold-cathode, UV sensitive [[Flame supervision device|flame detector tube]], direct operation from 220VAC mains, Noval base with only 4 pins<ref>{{cite web |url=http://lampes-et-tubes.info/pc/155UG.pdf |publisher=Valvo |title=155UG data sheet |date=November 1966 |language=de |access-date=23 August 2021}} • [http://lampes-et-tubes.info/pc/pc022.php?l=e on Lampes-et-tubes]</ref>*'''2B6''' – ''[[Triple-twin|Triple-Twin]]'' AF signal + ''zero bias'' power triode, internally connected as a cathode follower like today's [[Darlington transistor]]s; cf. 295, 6B5, 6N6*'''6AC5-G''' – ''Zero bias'' high-μ power triode designed for operation with positive grid bias up to +13 V supplied from a [[Amplifier#Common terminal|cathode follower]] driver triode such as 76, 6J5, 6P5, or half a 6AE7; cf. 295, 2B6, 6B5, 6N6 ''[[Triple-twin|Triple-Twin]]'' [[Darlington transistor|Darlington]] triodes*'''6AE7-GT''' – Dual triode with a common, single anode, for use as a cathode follower driver for two ''zero bias'' power triodes such as 6AC5; cf. 295, 2B6, 6B5, 6N6 ''Triple-Twin'' Darlington triodes*'''6B5''' – ''[[Triple-twin|Triple-Twin]]'' AF signal + ''zero bias'' power triode, internally connected as a cathode follower like today's [[Darlington transistor]]s; cf. 295, 2B6, 6N6*'''6BC5''' – Semiremote-cutoff RF pentode up to 400 MHz*'''6BR7''' – Low-[[microphonics]] AF pentode*'''6CE5''' – Semiremote-cutoff RF pentode*'''6SR7''' – Dual diode + triode*'''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*'''12SF7GT''' – Diode + pentode*'''50X6''' (Loctal base), '''50Y7GT''' (Octal base, heater tap for a pilot light) – Separate cathodes dual rectifier for use as a [[voltage doubler]]*'''1B25''' – 160 V [[Surge protector#Gas discharge tube (GDT)|Cold-cathode surge protector]]*'''1B46''' (79...85 V), '''1B47''' (75...90 V), '''1B64''' (70 V) – 1...2 mA [[Voltage-regulator tube]]s, dual-contact [[Lightbulb socket#Bayonet styles|bayonet candelabra]] mount*'''1B59''' – Cold-cathode ''Glow modulator tube'', modulation up to 15 kHz, 2-pin Octal base===='''XG'''====*'''XG1/2500''' – 1 kV, 2.5 A Mercury-vapor triode [[thyratron]] with anode top cap*'''XG2/6400''' – 2.5 kV, 6.4 A Mercury-vapor triode thyratron with anode top cap===='''XH'''====*'''XH3/045''' (3C45) – 3 kV, 45 mA Hydrogen triode thyratron with anode top cap*'''XH8/100''' (4C45) – 8 kV, 100 mA Hydrogen triode thyratron with anode top cap*'''293A''' – AF Power pentode, 10 V/320 mA heater, 6-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/293A.pdf |title=293A Vacuum tube |publisher=[[Western Electric]] |access-date=11 June 2021}}</ref> (not to be confused with the [[#Directly AC-heated power tubes|{{color|Green|293 ''Triple-Twin''}}]])*'''295A''' – 125 W, Directly heated AF/RF power triode, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/295A.pdf |title=295A Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=12 June 2021}}</ref> (not to be confused with the 295 ''Triple-Twin'')[[Philips]], [[Mullard]]:*'''4606''' – Directly heated triode, 4.5 V/1 A filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4607''' – Directly heated triode, 2.1 V/1 A filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4609''' – Directly heated triode, 4.2 V/250 mA filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4613''' – Directly heated power triode, 4 V/1 A filament, 4-pin base*'''4614''' – Indirectly heated power triode, 4 V/1 A heater, 5-pin base*'''4617''' – Directly heated triode, 4 V/250 mA filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4624''' – Directly heated power triode, 7.2 V/1.1 A filament, 4-pin base*'''4630''' – Directly heated triode, 4.2 V/250 mA filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4631''' – Directly heated triode, 2 V/250 mA filament, 4-pin bayonet base, for use as preamplifier in telephone equipment*'''4641''' – Directly heated power triode, 4 V/2.1 A filament, 4-pin base*'''4657''' – Indirectly heated, shielded AF triode, 4 V/1 A heater, 5-pin base*'''4662''' – Neon-filled bar graph indicator, a glass tube with a short anode, a keep-alive anode and a long wire cathode that glows partially, the glow length is proportional to the tube current; cf. [[#OET|{{color|Green|GEC TuneOn}}]], ИН-9*'''4683''' – Directly heated power triode, 4 V/950 mA filament, side-contact 8 base[[RCA]]:*'''4028''' – Ceramic/metal ''pencil''-type disk-[[Cermet#Ceramic-to-metal joints and seals|seal]] UHF power triode for pulsed operation up to 1 kW*'''4037A''' – [[Triode#Lighthouse tubes|''Lighthouse''-type]] disk-seal UHF power triode for continuous operation, P<sub>anode</sub> = 6.25 W up to 2 GHz, replaces 2C40A*'''4055''' – Ceramic/metal ''pencil''-type disk-seal SHF power triode for pulsed operation up to 1.3 kW*'''4058''' – Ceramic/metal ''pencil''-type disk-seal SHF power triode for pulsed operation up to 800 W*'''4060''', '''4061''' – Cased-in ceramic/metal ''pencil''-type disk-seal UHF power triode for pulsed operation up to 500 W*'''4068''' – Cased-in ceramic/metal ''pencil''-type disk-seal UHF power triode for pulsed operation up to 500 W*'''4070''', '''4071''' – Cased-in ceramic/metal ''pencil''-type disk-seal UHF power triode for pulsed operation up to 600 W*'''4072''' – Cased-in ceramic/metal ''pencil''-type disk-seal UHF power triode for pulsed operation up to 500 W*'''4449A''' – Image converter for use as a high-speed [[Shutter (photography)|high-speed shutter]] in photography, S11-type [[photocathode]], P11 blue, short-persistence [[phosphor]]*'''4486''' – 7NP4 [[CRT projector|projection CRT]] with a fitted HV cable*'''4583''' (Sulfide [[phosphor]], blue), '''4584''' (Silicate, green), '''4585''' (Rare earth, red) – 7" Projection CRT set, 80 kV anode voltage, considerable [[X-ray tube#Hazards of X-ray production from vacuum tubes|X-radiation]], magnetic deflection, for use with [[Cassegrain reflector#Schmidt-Cassegrain|Schmidt optics]]*'''4600A''' – 3.5 kV, 1.75 kW Beam power tetrode for voltage regulator applications *'''4604''' – 60 MHz, 90 W RF Beam power tetrode, filament warm-up time less than a second, for use in mobile and emergency transmitters where the [[Push-to-talk|push-to-talk button]] also controls the heater supply*'''4616''' (275kW pulsed 600MHz), '''4618''' (1.35kW CW 600MHz), '''4621''' (17kW pulsed 1.215GHz), '''4622''' ('''7649''', 4.5kW pulsed 1.215GHz), '''4624''' (300W CW 890MHz), '''4626''' (1.5kW), '''4628''' (10kW), '''4630''' (7.5kW), '''4631''' (80W CW 400MHz), '''4632''' (2.3kW CW 890MHz), '''4634''' (600W), '''4635''' (2.5kW CW 400MHz), '''4636''' (300W CW 890MHz), '''4637''' (340W CW 400MHz), '''4638''' (1.5kW), '''4647''' (500W pulsed 1GHz), '''4648''' (1kW pulsed 1GHz), '''4651''' (1kW CW 400MHz), '''4652/8042''' (90W CW 60MHz), '''4661''' (1.5kW CW 400MHz), '''4662''' (300W CW 470MHz) – Beam power tetrodes*'''4617''' – 425 MHz, 8 MW Water cooled, pulsed RF power triode, 1.5 V/1.8 kA filament*'''4620''' – 857B Mercury-vapor rectifier with a shielded filament to protect it against arc-back*'''4654/5762''' – 216 MHz, 6.35 kW VHF power triode*'''4820''' – 5" Projection CRT, 45 kV anode voltage, considerable X-radiation, magnetic deflection, P45 white, medium-persistence [[phosphor]], for use with Schmidt optics[[Standard Telephones and Cables]]:*'''4011B''' – 30 W Directly heated power triode, 8 V/1.6 A filament, 4-pin bayonet base*'''4015A''' = STC '''3D/150G''' – 1.5 kW Directly heated power triode, 11 V/41 A filament, cable connections*'''4016A''', '''4016B''' (grid on opposite side) – 33 MHz, 400 W Directly heated power triode, 14 V/18 A filament, base and lateral stud connections*'''4019A''' (4-pin bayonet base), '''4019B''' (British 4-pin base) – 290 mW Directly heated power triode, 4 V/250 mA filament*'''4020A''' (4-pin bayonet base), '''4020B''' (British 4-pin base), '''4020C''' (British 4-pin base with grid on top cap) – Directly heated triode, 2 V/250 mA filament*'''4021A/B/C''' – 250 mW Directly heated power triode, 4 V/250 mA filament*'''4022A/AR/B''' – 160 mW Directly heated power triode, 4 V/250 mA filament*'''4033A''' (British 5-pin base), '''4033AF''' (qualified for use in [[Aircraft station|standard aircraft radio]]), '''4033B''' (American 5-pin base), '''4033L''' = STC '''3B/252B''' – 2 MHz, 25 W Indirectly heated power triode, 6 V/1.4 A heater*'''4043A/C''' ('''3B/351A''', American 4-pin base), '''4043B/D''' ('''3B/351B''', British 4-pin base) – 2 MHz, 35 W Directly heated power triode, 7.5 V/1.2 A filament, versions C and D with reduced grid emission*'''4056A/B''' (STC '''3B/352A''') – 35 W Directly heated power triode, 6 V/1.9 A filament, 4-pin base*'''4060A''' – 10 MHz, 200 W Directly heated power triode, 12.5 V/6 A filament*'''4062A''' – 15 MHz, 75 W Directly heated power triode, 12 V/1.85 A filament, 4-pin base*'''4074A''' = STC '''33A/138A''' – 100 MHz, 5 W each, Indirectly heated dual power triode, 6.3 V/800 mA heater, 7-pin base with anodes on top caps*'''4094A''' = STC '''3B/851A''' – 6 MHz, 85 W Directly heated power triode, 10 V/3.25 A filament, 4-pin base*'''4097A''' – 2 MHz, 35 W Directly heated power triode, 6 V/1.1 A filament, 4-pin base*'''4101D/E/G''' (Western Electric '''101D/F/J/L/M''') – 285 mW Directly heated power triode, 4.5 V/1 A filament, 4-pin bayonet base*'''4102D/E/G''' (WE '''102D/E/F/G/L''') – Directly heated triode, 2 V/970 mA filament, 4-pin bayonet base*'''4104D/E/G''' (WE '''104D''') – 300 mW Directly heated power triode, 4.4 V/970 mA filament, 4-pin bayonet base*'''4205E''' = WE '''205E''', '''M4205E''' (reduced anode and grid secondary emission) – 15 MHz, 15 W Directly heated power triode, 4.5 V/1.6 A filament, 4-pin bayonet base with offset pin*'''4211D''' = WE '''211D''', '''4211E''' (1 µH [[Choke (electronics)|chokes]] in grid and anode leads to prevent VHF oscillation) – 65 W Directly heated power triode, 10 V/3 A filament, 4-pin bayonet base; replaced by 4242A*'''4212D''' = WE '''212D''' (200 W Oxidized nickel anode), '''4212E''' = STC '''3C/270A''' (275 W molybdenum anode) – 1.5 MHz Directly heated power triode, 14 V/6 A filament, 4-pin base*'''4215A''' = WE '''215A''' – Directly heated miniature AF/IF/detector triode, 1.1 V/250 mA filament, ''Peanut'' 4-stub base*'''4242A''' = WE '''242A''' = STC '''3B/850A''' – 6 MHz, 85 W Directly heated power triode, 10 V/3.25 A filament, 4-pin bayonet base; 4211D with a molybdenum anode*'''4251A''' = WE '''251A''', '''4251AX''' – 30 MHz, 1 kW Directly heated power triode, 10 V/16 A filament, stud connections*'''4264A''' = WE '''264A''' = STC '''3A/135A''' – Directly heated triode, 1.5 V/300 mA filament, 4-pin base*'''4270A''' = WE '''270A''' = STC '''3C/350E''' – 7.5 MHz, 350 W Directly heated power triode, 10 V/9.75 A filament, 3-pin base with anode on top stud*'''4275A''' = WE '''275A''' = STC '''3B/170A''' – 17 W Directly heated power triode, 5 V/1.2 A filament, 4-pin base*'''4279A''' = WE '''279A''' – 20 MHz, 1.2 kW Directly heated power triode, 10 V/21 A filament, stud connections*'''4300A''' = WE '''300A''' = STC '''3B/400A''' – 40 W Directly heated power triode, 5 V/1.2 A filament, 4-pin base*'''4304B''' = WE '''304B''' ('''3B/504B''', American 4-pin base), '''4304BB''' (British 4-pin base) – 100 MHz, 50 W Directly heated power triode, 7.5 V/3.25 A filament, anode and grid on top stud*'''4307A''' = WE '''307A''' – 40 MHz, 15 W Directly heated power pentode, 5.5 V/1 A filament; remotely similar to the indirectly heated [[807 (vacuum tube)|807]] beam power tetrode. Both types have an ST-16 envelope with an anode top cap and a U5A American 5-pin base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:SY4307A|class=noviewer|alt=]]*'''4308B''' = WE '''308B''' – 1.5 MHz, 250 W Directly heated power triode, 14 V/6 A filament, 4-pin base*'''4316A''' = WE '''316A''' – 600 MHz, 30 W Directly heated [[Acorn tube|''Doorknob''-type]] UHF power triode, 2 V/3.65 A filament*'''4356A''' = WE '''356A''' = STC '''3B/505E''' – 100 MHz, 50 W Directly heated power triode, center-tapped 5 V/5 A filament, 4-pin base with anode on top stud*'''291''' (12.6 V/300 mA heater/filament), '''293''' (6.3 V/600 mA heater/filament), '''295''' (2.5 V/4 A heater/filament) – ''[[Triple-twin|Triple-Twin]]'' indirectly heated AF signal triode + half-indirectly heated ''zero bias'' power triode, internally connected as a cathode follower like today's [[Darlington transistor]]s; cf. 2B6, 6B5, 6N6 (not to be confused with the 293A resp. 295A):*[[Diode]], vacuum or gas-discharge or mercury-arc [[rectifier]]:*''Glow modulator tube'', a linear gas-discharge light source for rotating-drum [[FAX]] receivers, [[Optical sound|film soundtrack]] recording, etc.:*[[Voltage-regulator tube]]:*[[Gaseous ionization detector|Radiation counter]] ([[Geiger–Müller tube|Geiger-Müller]]) tube:*[[Spark gap]], [[Electric arc|arc-discharge]] tubeOptional preceding letter(s):*'''DE''' – [[Hot cathode|''Dull Emitter'']] tube<ref name="Stokes70Years" />{{rp|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 [[#MOMP|{{color|Green|Marconi tube with an M-P designation}}]]*'''V''' – Vari-μ = remote-cutoff tube*'''T''' – ([[Thyratron|Gas/vapor-filled]]) triode*'''U''' – Gas/vapor-discharge or vacuum [[rectifier]]—'''Radiation detectors'''::One or more letters::*'''А''' ⟼ '''A''' – [[Alpha particle|α rays]]:*'''Б''' ⟼ '''B''' – [[Beta particle|β rays]]:*'''Г''' ⟼ '''G''' – [[Gamma ray|γ rays]]:*'''Р''' ⟼ '''R''' – [[X-ray]]s*No [[getter]] to minimize internal [[Leakage (electronics)|leakage currents]] via getter material condensed on the inside walls of [[electrometer]] tubes*'''1K125CA''' – 1.25 W 3.7 to 4.4 GHz, waveguide output [[Sutton tube|Reflex Klystron]]*Gold-plated grid wires to prevent [[secondary emission]]*'''205D/E/F''' – 14 W, Directly heated AF or modulator power triode, 4.5 V/1.6 A filament, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/205D.pdf |title=205D Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=14 June 2021}}<!-- http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/205D_WE_Datasheet.pdf --> • {{cite web |url=https://frank.pocnet.net/sheets/136/2/205E.pdf |title=205E Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/205E.pdf |title=205E Vacuum tube |publisher=[[Western Electric]] |date=1 February 1933 |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/205F.pdf |title=205F Vacuum tube |publisher=[[Western Electric]] |date=January 1950 |access-date=20 June 2021}}</ref>*'''211/B/C/D''' – 260 W, Directly heated AF or modulator power triode now favored by audiophiles, Jumbo 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/049/2/211.pdf |title=211 Power triode |publisher=[[RCA]] |date=1 May 1950 |access-date=12 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/084/h/HF120.pdf |title=HF120/211B Transmitting Tube |publisher=[[Amperex Electronic|Amperex]] |date=April 1948 |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/111/2/211C.pdf |title=HF130/211C Transmitting Tube |publisher=Amperex |access-date=20 June 2021}} •{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/211D.pdf |title=211D Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''212D/E''' – 250 W, Directly heated RF transmitter power triode, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/212D.pdf |title=212D Vacuum tube |publisher=[[Western Electric]] |date=1 May 1933 |access-date=20 June 2021}} • {{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/212E_WE_Datasheet.pdf |title=212E Vacuum tube |publisher=[[Western Electric]] |access-date=12 June 2021}}</ref>*'''231D''', '''257A''' (control grid on top cap) – Directly heated AF triode, 3.1 V/60 mA filament, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/231D.pdf |title=231D Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/257A.pdf |title=257A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''240A/B''' – 10 kW, Water-cooled, directly heated RF transmitter power triode<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/240a(34).pdf |title=240A Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=21 June 2021}} • {{cite web |url=http://www.tubecollectors.org/we/archives/240b(36).pdf |title=240B Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=21 June 2021}}</ref>*'''241B''' – 275 W, Directly heated RF/AF/modulator power triode, 3-pin base, anode on top cap<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/241B.pdf |title=241B Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/026/2/241B.pdf |title=ML-241B Description & Ratings |publisher=[[Machlett Laboratories]] |date=August 1950 |access-date=12 June 2021}}</ref>*'''242A/B/C''' – Directly heated AF/modulator power triode, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/242A.pdf |title=242A Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=12 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/136/2/242B.pdf |title=242B Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/242C.pdf |title=242C Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''244A''', '''247A''' – Indirectly heated, low-power AF triode, 2 V/1.6 A heater, 5-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/244A.pdf |title=244A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=http://www.tubecollectors.org/we/archives/247a.pdf |title=247A Vacuum tube |publisher=Western Electric |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/136/2/247A.pdf |title=247A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''245A''' – Indirectly heated RF/AF tetrode, 2 V/1.6 A heater, 5-pin base, control grid on top cap<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/245A.pdf |title=245A Electron Tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''246A''' – Directly heated RF/AF tetrode, 3.3 V/100 mA filament, 4-pin base, control grid on top cap<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/246A.pdf |title=246A Electron Tube |publisher=[[Western Electric]] |date=1 May 1933 |access-date=20 June 2021}}</ref>*'''251A''' – 600 W, Directly heated AF/modulator power triode, special wall mount construction<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/251A.pdf |title=251A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''252A''' – Directly heated AF power triode, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/252A.pdf |title=252A Vacuum tube |publisher=[[Western Electric]] |access-date=12 June 2021}}</ref>*'''256A''' – 325 V, 75 mA Argon thyratron, 5-pin base;<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/256A.pdf |publisher=[[Western Electric]] |title=256A Vacuum Tube |access-date=20 June 2021}}</ref>*'''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<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/259A.pdf |title=259A Vacuum Tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/136/2/259B.pdf |title=259B Vacuum Tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/136/2/283A.pdf |title=283A Vacuum Tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''260A''' – 100 W Directly heated RF power tetrode, 4-pin base, control grid and anode on lateral and top wires<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/260a(36).pdf |title=260A Vacuum tube |publisher=[[Western Electric]] |access-date=21 June 2021}}</ref>*'''262A/B''' (4-pin base), '''347B''' (Octal base) – Indirectly heated AF power triode, control grid on top cap<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/262A.pdf |title=262A Vacuum tube |publisher=[[Western Electric]] |access-date=12 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/262B.pdf |title=262B and 347B Vacuum tubes |publisher=[[Western Electric]] |access-date=12 June 2021}}</ref>*'''264A/B/C''' – Directly heated low-microphonics AF triode, 1.5 V/300 mA filament, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/264B.pdf |title=264A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/136/2/264B.pdf |title=264B Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/264C.pdf |title=264C Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''267B''' (2-pin base), '''319A''' (4-pin base) – Directly heated half-wave vacuum rectifiers, anode on top cap<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/267B.pdf |title=267B and 319A Vacuum tubes |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''269A''' – 275 V, 20 mA Argon thyratron, 4-pin base;<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/269A.pdf |publisher=[[Western Electric]] |title=269A Vacuum Tube |access-date=20 June 2021}}</ref>*'''271A''' – Directly heated AF power triode, 5-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/271A.pdf |title=271A Vacuum tube |publisher=[[Western Electric]] |access-date=12 June 2021}}</ref>*'''272A''' – Indirectly heated, low-power AF triode, 10 V/430 mA heater, 5-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/272A.pdf |title=272A Vacuum tube |publisher=Western Electric |access-date=20 June 2021}}</ref>*'''277A''' – 350 V, 500 mA Argon thyratron, 5-pin base;<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/277A.pdf |publisher=[[Western Electric]] |title=277A Vacuum Tube |access-date=20 June 2021}}</ref>*'''278A''' – 800 W Directly heated RF power tetrode, special wall mount construction<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/278a(37).pdf |title=278A Vacuum tube |publisher=[[Western Electric]] |access-date=21 June 2021}}</ref>*'''281A''' – Directly heated moderate-power AF tetrode with a [[Tetrode#Space charge grid tube|space charge grid]], 5 V/1.6 A filament, 5-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/281A.pdf |publisher=[[Western Electric]] |title=281A Vacuum Tube |access-date=20 June 2021}}</ref>*'''282A''' – 70 W Directly heated RF power tetrode, 4-pin base, anode on top cap<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/282A.pdf |title=282A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''284A''' – 85 W, Directly heated RF/AF/modulator power triode, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/284A.pdf |title=284A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}} • {{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/284D.pdf |title=284D Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>*'''285A''' – Low-power AF pentode, 2 V/1 A heater, 5-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/285A.pdf |title=285A Vacuum tube |publisher=[[Western Electric]] |access-date=11 June 2021}}</ref>*'''286A''' – Remote-cutoff IF/AF pentode, 6-pin base, grid 1 on top cap<ref>{{cite web |url=https://frank.pocnet.net/sheets/136/2/286A.pdf |title=286A Vacuum tube |publisher=[[Western Electric]] |access-date=12 June 2021}}</ref>*'''287A''' – 1.5 A, Mercury-vapor [[Thyratron]]<ref name="WE287A_323A_354A_355A">{{cite web |url=https://frank.pocnet.net/sheets/080/2/287A.pdf |title=287A, 323A, 354A, 355A Vacuum tubes |publisher=[[Western Electric]] |year=1941 |access-date=12 June 2021}}</ref>*'''297A''' – 250 V, 10 mA Argon thyratron, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/297A.pdf |publisher=[[Western Electric]] |title=297A Vacuum Tube |access-date=20 June 2021}}</ref>*'''301A''' – 1.8 kV, 1 A Full-wave [[Mercury-arc valve|Mercury-vapor rectifier]], 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/301A.pdf |title=301A Vacuum tube |publisher=[[Western Electric]] |access-date=19 June 2021}}</ref>*'''308B''' – 250 W Directly heated AF power triode, 14 V/6 A filament, 4-pin base<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/308b(36).pdf |publisher=[[Western Electric]] |title=308B Vacuum Tube |year=1936 |access-date=5 June 2021}}</ref>*'''310B''' – Sharp-cutoff RF/AF pentode, 10 V/320 mA heater<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/310B_WE_Datasheet.pdf |title=310B Electron tube |publisher=[[Western Electric]] |date=February 1956 |access-date=11 June 2021}}</ref>*'''311A/B''' – Sharp-cutoff RF/AF pentode<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/311A_WE_Datasheet.pdf |title=311A Electron tube |publisher=[[Western Electric]] |date=May 1948 |access-date=11 June 2021}} • {{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/311B_WE_Datasheet.pdf |title=311B Electron tube |publisher=[[Western Electric]] |date=October 1960 |access-date=11 June 2021}}</ref>*'''312A''' – 50 W Directly heated RF/AF power pentode, center-tapped 10 V/3.8 A filament, 6-pin base, anode on top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/312a(37).pdf |publisher=[[Western Electric]] |title=312A Vacuum Tube |year=1937 |access-date=5 June 2021}}</ref>*'''313A''' – Gas-filled, cold-dual-cathode trigger tube, 4-pin base, usable as thyratron, as voltage regulator or as rectifier<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/313A_WE_Datasheet.pdf |title=313A Vacuum tube |publisher=[[Western Electric]] |year=1936 |access-date=11 June 2021}}</ref>*'''314A''' – 300 V, 2.5 A Full-wave Mercury-vapor rectifier, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/314A.pdf |title=314A Vacuum tube |publisher=[[Western Electric]] |access-date=19 June 2021}}</ref>*'''315A''' – 12.5 kV, 2 A Half-wave Mercury-vapor rectifier<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/315A.pdf |title=315A Vacuum tube |publisher=[[Western Electric]] |access-date=19 June 2021}}</ref>*'''322A''' (Western Electric), '''332A''' (WE, grid 3 internally tied to filament center tap) – 125 W Directly heated RF/AF power pentode, 5-pin base, anode on top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/322a(39).pdf |publisher=[[Western Electric]] |title=322A Vacuum Tube |year=1939 |access-date=5 June 2021}}</ref>*'''328A''' – 310A with a 7.5 V/425 mA heater<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/328A_1937_WE_Datasheet.pdf |title=328A Electron tube |publisher=[[Western Electric]] |year=1937 |access-date=11 June 2021}}</ref>*'''329A''' (Western Electric) – Sharp-cutoff RF/AF pentode<ref name="WE311A_329A" />*'''331A''' – 125 W, 30 MHz Directly heated RF/AF power triode, 10 V/3.25 A filament, 4-pin base, anode on top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/331a(39).pdf |publisher=[[Western Electric]] |title=331A Vacuum Tube |year=1939 |access-date=5 June 2021}}</ref>*'''333A''' – Gas-filled cold-cathode trigger triode, one starter electrode, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/333A_WE_Datasheet.pdf |title=333A Electron tube |publisher=[[Western Electric]] |date=December 1947 |access-date=11 June 2021}}</ref>*'''336A''' – 12 W Indirectly heated AF power pentode, 6-pin base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/336A_WE_Datasheet.pdf |title=336A Pentode |publisher=[[Western Electric]] |date=January 1948 |access-date=11 June 2021}}</ref>*'''337A''' – Remote-cutoff RF/AF pentode<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/337A_WE_Datasheet.pdf |title=337A Electron tube |publisher=[[Western Electric]] |date=March 1951 |access-date=11 June 2021}}</ref>*'''338A''' – 325 V, 100 mA Argon/Mercury-vapor thyratron, 5-pin base;<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/338A.pdf |publisher=[[Western Electric]] |title=338B Vacuum Tube |year=1962 |access-date=19 June 2021}}</ref>*'''340A''' – 25 kW, 4 MHz Water-cooled, directly heated power triode<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/340a(39).pdf |publisher=[[Western Electric]] |title=340A Vacuum Tube |year=1939 |access-date=5 June 2021}}</ref>*'''345A''' (5-pin base), '''351A''' (6-pin base) – Directly heated full-wave vacuum rectifiers<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/345A.pdf |title=345A/351A Vacuum tubes |publisher=[[Western Electric]] |access-date=19 June 2021}}</ref>*'''346B/C''' – Gas-filled cold-cathode trigger triode, one starter electrode, below {{cvt|5|uCi|kBq|lk=on}} of [[Krypton-85|<sup>85</sup>Kr]] keep-alive ([[half-life]]: 10.756 years), 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/084/3/346B.pdf |publisher=[[Western Electric]] |title=346B Electron tube |date=April 1956 |access-date=12 June 2021}}<!-- http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/346B_WE_Datasheet.pdf --> • {{cite web |url=https://frank.pocnet.net/sheets/084/3/346C.pdf |publisher=Western Electric |title=346C Electron tube |year=1962 |access-date=12 June 2021}}<!-- http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/346C_WE_Datasheet.pdf --></ref>*'''347A''' – Indirectly heated low-microphonics, low-noise, low-hum AF triode, 6.3 V/500 mA heater, Octal base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/347A_WE_Datasheet.pdf |title=347A Triode |publisher=[[Western Electric]] |date=November 1947 |access-date=11 June 2021}}</ref>*'''349A''' – 12 W Indirectly heated AF power pentode, Octal base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/349A_WE_Datasheet.pdf |title=349A Pentode |publisher=[[Western Electric]] |date=January 1948 |access-date=11 June 2021}}</ref>*'''350B''' – 27 W Indirectly heated AF beam power tetrode, 6.3 V/1.6 A heater<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/350B_WE_Datasheet.pdf |title=350B Tetrode |publisher=[[Western Electric]] |date=March 1949 |access-date=11 June 2021}}</ref>*'''352A''' – Indirectly heated dual diode + triode, 6-pin base with triode grid on top cap<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/352A_WE_Datasheet.pdf |title=352A Vacuum Tube |publisher=[[Western Electric]] |year=1939 |access-date=11 June 2021}}</ref>*'''353A''' – Gas-filled cold-cathode trigger triode, split starter electrode, <5 µCi of <sup>85</sup>Kr keep-alive, 4-pin base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/353A_WE_Datasheet.pdf |title=353A Electron Tube |publisher=[[Western Electric]] |year=1962 |access-date=11 June 2021}}</ref>*'''356A''' (Western Electric) – 50 W, 100 MHz Directly heated RF/AF power triode, 5 V/5 A filament, 4-pin base, anode on top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/356a.pdf |publisher=[[Western Electric]] |title=356A Vacuum Tube |year=1939 |access-date=14 June 2021}}</ref>*'''358A''' – Gas-filled cold-cathode visual indicator, <5 µCi of <sup>85</sup>Kr keep-alive, 2 flying leads, for use in telephone circuits<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/358A_WE_Datasheet.pdf |title=358A Electron Tube |publisher=[[Western Electric]] |year=1962 |access-date=11 June 2021}}</ref>*'''359A''' – Gas-filled cold-cathode trigger triode, one starter electrode, <5 µCi of <sup>85</sup>Kr keep-alive, 3 flying leads<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/359A_WE_Datasheet.pdf |title=359A Electron tube data sheet |publisher=[[Western Electric]] |year=1962 |access-date=11 June 2021}}</ref>*'''363A''' – 350 W, 85 MHz Directly heated VHF power pentode, center-tapped 10 V/10 A filament, 6-pin base, anode on top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/363a(41).pdf |publisher=[[Western Electric]] |title=363A Vacuum Tube |year=1941 |access-date=5 June 2021}}</ref>*'''364A''' – 50 W, 150 MHz Directly heated VHF power triode, center-tapped 5 V/5 A filament, 5-pin base, anode on two top caps<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/364a(41).pdf |publisher=[[Western Electric]] |title=364A Vacuum Tube |year=1941 |access-date=5 June 2021}}</ref>*'''372A''' – Gas-filled cold-cathode trigger triode, one starter electrode, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/372A_WE_Datasheet.pdf |title=372A Electron tube data sheet |publisher=[[Western Electric]] |date=December 1947 |access-date=11 June 2021}}</ref>*'''373A''' – Directly heated sharp-cutoff RF/AF pentode, 2 V/250 mA filament, Octal base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/373A_WE_Datasheet.pdf |title=373A Pentode |publisher=[[Western Electric]] |date=November 1949 |access-date=11 June 2021}}</ref>*'''374A''' – 4.8 W Directly heated power pentode, 3 V/530 mA filament, Octal base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/374A_WE_Datasheet.pdf |title=374A Pentode |publisher=[[Western Electric]] |date=November 1949 |access-date=11 June 2021}}</ref>*'''375A''' – 6 W Indirectly heated low (48-130 V) anode voltage AF beam power tetrode, 20 V/320 mA heater<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/375A.pdf |title=375A Vacuum Tube |publisher=[[Western Electric]] |date=May 1950 |access-date=19 June 2021}}</ref>*'''384A''' (Flying leads), '''385A''' (Octal base) – Indirectly heated ''Mushroom'' or ''Little Doorknob'' UHF pentode<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/384A_385A_WE_Datasheet.pdf |title=384A Electron Tube |publisher=[[Western Electric]] |year=1941 |access-date=11 June 2021}}</ref>*'''394A''' – 1.25 kV, 640 mA Argon/Mercury-vapor thyratron, Octal base;<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/394A.pdf |title=394A Electron Tube |publisher=[[Western Electric]] |date=October 1962 |access-date=19 June 2021}}</ref>*'''405A''' – Gas-filled cold-cathode trigger triode, one starter anode, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/405A_WE_Datasheet.pdf |title=405A Cold cathode |publisher=[[Western Electric]] |date=January 1950 |access-date=12 June 2021}}</ref>*'''409A''' = '''6AS6''' – Pentode with a fine-pitched suppressor grid which could serve as a second control grid. Used in radar ''[[phantastron]]'' circuits<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/409A_WE_Datasheet.pdf |title=6AS6/409A Electron Tube |publisher=[[Western Electric]] |date=May 1948 |access-date=12 June 2021}}</ref>*'''410A''' – 1.5 kV, 8 A Mercury-vapor thyratron<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/410A_WE_Datasheet.pdf |title=410A Electron Tube |publisher=[[Western Electric]] |date=October 1962 |access-date=12 June 2021}}</ref>*'''411A''' (Western Electric) – Gas-filled cold-cathode trigger triode, one starter anode, one starter cathode, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/411A_WE_Datasheet.pdf |title=405A Cold cathode |publisher=[[Western Electric]] |date=January 1950 |access-date=12 June 2021}}</ref>*'''412A''' – Full-wave rectifier, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/412A_WE_Datasheet.pdf |title=412A Electron Tube |publisher=[[Western Electric]] |date=January 1949 |access-date=12 June 2021}}</ref>*'''413A''' – Gas-filled cold-cathode trigger triode, no starter electrode, [[Radium bromide|RaBr<sub>2</sub>]] keep-alive, 2-pin base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/413A_WE_Datasheet.pdf |title=413A Electron Tube |publisher=[[Western Electric]] |date=April 1956 |access-date=12 June 2021}}</ref>*'''414A''' – Pentode, Miniature 7-pin base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/414A_WE_Datasheet.pdf |title=414A Electron Tube |publisher=[[Western Electric]] |date=May 1949 |access-date=12 June 2021}}</ref>*'''415A''' – UHF Pentode, Miniature 7-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/415A.pdf |title=415A Miniature UHF Pentode |publisher=[[Western Electric]] |date=April 1949 |access-date=19 June 2021}}</ref>*'''420A''' – High-mu dual triode with a center-tapped 12.6/6.3 V heater, Noval base, for use as DC amplifier<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/420A_WE_Datasheet.pdf |title=420A Electron Tube |publisher=[[Western Electric]] |date=June 1962 |access-date=12 June 2021}}</ref>*'''421A''' = '''5998''' – Dual power triodes, designed for series voltage regulator applications<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/421A_WE_Datasheet.pdf |title=421A Electron Tube |publisher=[[Western Electric]] |date=October 1953 |access-date=12 June 2021}}</ref>*'''422A''' – Full-wave rectifier, Octal base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/422A_WE_Datasheet.pdf |title=412A Electron Tube |publisher=[[Western Electric]] |date=October 1952 |access-date=12 June 2021}}</ref>*'''425A''' – Gas-filled cold-cathode trigger triode, one starter anode, one starter cathode, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/425A_WE_Datasheet.pdf |title=425A Cold cathode |publisher=[[Western Electric]] |date=June 1962 |access-date=12 June 2021}}</ref>*'''426A''' – Gas-filled cold-cathode trigger triode, one starter electrode, <5 µCi of <sup>85</sup>Kr keep-alive, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/426A_WE_Datasheet.pdf |title=426A Cold cathode |publisher=[[Western Electric]] |date=January 1962 |access-date=12 June 2021}}</ref>*'''429A''' – 12 W Indirectly heated AF beam power tetrode, 20 V/140 mA heater<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/429A_WE_Datasheet.pdf |title=429A Electron Tube |publisher=[[Western Electric]] |date=February 1961 |access-date=11 June 2021}}</ref>*'''432A''' – 100 V, 4 to 8 mA Voltage-regulator tube with a keep-alive (primer) electrode, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/432A_WE_Datasheet.pdf |title=432A Electron Tube |publisher=[[Western Electric]] |date=October 1950 |access-date=12 June 2021}}</ref>*'''435A''' (Input), '''436A''' (Intermediate), '''437A''' (Output) – Tetrodes<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/435A_WE_Datasheet.pdf |title=435A Electron Tube |publisher=[[Western Electric]] |date=June 1954 |access-date=12 June 2021}} • {{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/436A_WE_Datasheet.pdf |title=436A Electron Tube |publisher=[[Western Electric]] |date=May 1963 |access-date=12 June 2021}} • {{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/437A_WE_Datasheet.pdf |title=437A Electron Tube |publisher=[[Western Electric]] |date=October 1955 |access-date=12 June 2021}}</ref>*'''436A''' – RF tetrode<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/436A.pdf |title=436A Electron Tube |publisher=[[Western Electric]] |date=May 1963 |access-date=19 June 2021}}</ref>*'''439A''' – 1 kHz max., gas-filled, cold-cathode, 10-stage ''[[Dekatron|stepping tube]]''<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/439A.pdf |title=439A Electron Tube |publisher=[[Western Electric]] |date=June 1957 |access-date=19 June 2021}}</ref>*'''440A''' – Directly heated triode<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/440A_WE_Datasheet.pdf |title=440A Electron Tube |publisher=[[Western Electric]] |date=January 1962 |access-date=12 June 2021}}</ref>*'''441''' (General Electric) – Vacuum phototube, S4 spectral response, 4-pin base<ref>{{cite web |url=https://frank.pocnet.net/sheets/141/g/GL441.pdf |title=GL-441 Phototube |publisher=[[General Electric]] |date=April 1945 |access-date=12 June 2021}}</ref>*'''442A''' – Directly heated power triode<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/442A_WE_Datasheet.pdf |title=442A Electron Tube |publisher=[[Western Electric]] |date=March 1962 |access-date=19 January 2016}}</ref>*'''443A''' – Gas-filled cold-cathode trigger triode, one starter electrode, <5 µCi of <sup>85</sup>Kr keep-alive, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/443A_WE_Datasheet.pdf |title=443A Cold cathode |publisher=[[Western Electric]] |date=January 1962 |access-date=12 June 2021}}</ref>*'''444A''' – 6 GHz, 5 kW [[Traveling-wave tube]]<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/444A_WE_Datasheet.pdf |publisher=[[Western Electric]] |title=444A Electron tube |date=August 1960 |access-date=12 June 2021}}</ref>*'''446A''' (Western Electric) – 81 V, 5 to 40 mA Voltage regulator tube with a keep-alive (primer) electrode, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/446A_WE_Datasheet.pdf |title=446A Electron Tube |publisher=[[Western Electric]] |date=June 1963 |access-date=12 June 2021}}</ref>*'''447A''' – Gas-filled cold-cathode voltage regulator or visual trouble indicator tube, <5 µCi of <sup>85</sup>Kr keep-alive, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/447A_WE_Datasheet.pdf |title=447A Electron Tube |publisher=[[Western Electric]] |year=1962 |access-date=11 June 2021}}</ref>*'''448A''', '''448B''' ([[Aquadag]] coated), '''454A''' (shortened anode pin) – Tetrodes<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/448B_WE_Datasheet.pdf |title=448A, 448B, 454A Electron Tube |publisher=[[Western Electric]] |date=Sptember 1961 |access-date=12 June 2021}}</ref>*'''451A''' (Western Electric) – Gas-filled cold-cathode trigger triode, one starter anode, one starter cathode, <5 µCi of <sup>85</sup>Kr keep-alive, flying leads with lugs<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/451A_WE_Datasheet.pdf |title=425A Cold cathode |publisher=[[Western Electric]] |date=June 1962 |access-date=12 June 2021}}</ref>*'''453A''' – 83 V, 4 to 6 mA Voltage regulator tube, Noval base<ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/453A_WE_Datasheet.pdf |title=446A Electron Tube |publisher=[[Western Electric]] |date=June 1963 |access-date=12 June 2021}}</ref>*'''782''' – ''Sterilamp'', an early inert-gas/mercury-vapor [[germicidal lamp]]<ref>{{cite web |url=http://www.tubecollectors.org/west/archives/sterilamp.pdf |publisher=[[Westinghouse Electric (1886)|Westinghouse Electric]], Bloomfield, New Jersey, USA |title=WL-782 Sterilamp |date=August 1936 |access-date=5 June 2021}}</ref> for use e.g. inside hospital air ducts*'''785''' – Germicidal [[X-ray|''Lenard ray tube'']]<ref name="Lenardray785" />:*'''849H''' – 849 with the grid on the top cap of a lateral glass arm, extending the maximum frequency (without derating) to 30 MHz<ref>{{cite web |url=http://www.tubecollectors.org/amperex/archives/849ah.pdf |title=849A-H transmitting tube |publisher=[[Amperex Electronic|Amperex Electronic Corporation]], Brooklyn, New York, NY, USA |access-date=5 June 2021}}</ref>*'''216A''' – Directly heated amplifier/oscillator triode, 5 to 6 V/1 A filament, 4-pin base<ref>{{cite web |url=http://westernelectric.sectorlink.org/static/library/specifications/tubes/216A.pdf |title=216A Vacuum tube |publisher=[[Western Electric]] |access-date=20 June 2021}}</ref>:*'''2KD''' – [[Inductive output tube|''Klystrode'']]*'''2KDX15LA''' (15 kW, 470 to 600 MHz), '''2KDX15LF''' (15 kW, 600 to 860 MHz), '''2KDX40LA''', '''2KDX40LF''' (40 kW) – Forced-air cooled, electromagnet-focused Klystrodes<ref>{{cite web |url=http://www.tubecollectors.org/eimac/archives/2kdx15la(89).pdf |title=Eimac 2KDX15LA, 2KDX15LF technical data |publisher=[[Varian Associates|Varian]]/[[Eimac]] |date=March 1989 |access-date=28 May 2021}}</ref><ref>{{cite web |url=http://www.tubecollectors.org/eimac/archives/2kdx40la(90).pdf |title=Eimac 2KDX40LA, 2KDX40LF technical data |publisher=[[Varian Associates|Varian]]/[[Eimac]] |date=September 1990 |access-date=28 May 2021}}</ref>*'''2KDW60LA''', '''2KDW60LF''' – Water cooled, 60 kW, electromagnet-focused Klystrode<ref>{{cite web |url=http://www.tubecollectors.org/eimac/archives/2kdw60la(89).pdf |title=Eimac 2KDW60LA, 2KDW60LF technical data |publisher=[[Varian Associates|Varian]]/[[Eimac]] |date=March 1989 |access-date=28 May 2021}}</ref>:::'''Note:''' [[Gain (electronics)|Gain (amplification factor) '''μ''']] = [[Transconductance|Mutual conductance '''g<sub>m</sub>''']] × Anode resistance '''R<sub>a</sub>'''{{anchor|PhilipsBases}}From 1924 to 1939, Philips printed a basing code on [[commons:Category:Vacuum tube boxes|tube cartons]] and price lists, but not on the tubes themselves.<ref name="Stokes70Years" />{{rp|228}} Socket designations such as {{Nowrap|"A-type"}} or {{Nowrap|"P-base"}} refer to this code, which was later (1950s) expanded to a [[#Bases|{{color|Green|<BasingCode><PinCount><Variant> format}}]]:*'''A''' – 4-pin Continental European base, originally Franco-British*'''B''' – 4-pin [[Telefunken]] base (1920s);<ref name="PhilipsBuizen1927" />{{rp|16f}} later 6-pin Continental European base (1930s)<ref name="PhilipsMiniwatt1938" />{{rp|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 [[Radiotechnique|''Radiola'']] base (1920s); later 7-pin Medium American base (1930s)*'''F''' – 4-stub American [[#With a 3.3 Volts DC filament|{{color|Green|UV-199}}]]-type base*'''G''' – 4-pin American base (UX)*'''H''' – 3-pin Continental European base*'''J''' – 6-pin American base*'''K''' – Octal base*'''L''' – 5-pin Special base<ref name="PhilipsMiniwattComparisonList1939">{{cite web |url=https://frank.pocnet.net/other/Philips/PMCPBFV1939.pdf |title=Philips Miniwatt Comparative Pocketbook For Valves 1939 |edition=6 |date=January 1939 |access-date=7 April 2021}}</ref>{{rp|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<ref name="PhilipsMiniwattComparisonList1939" />{{rp|91}}*'''R''' – 9-pin British base<ref name="PhilipsMiniwattComparisonList1939" />{{rp|91}}*'''S''' – 4-pin Subminiature [[hearing aid]] base<ref name="PhilipsMiniwattComparisonList1939" />{{rp|91}}*'''T''' – 9-pin all-glass Continental European base*'''U''' – 6-pin Special base<ref name="PhilipsMiniwattComparisonList1939" />{{rp|90}}*'''V''' – Side-contact 5 base*'''W''' – 4-pin Special base<ref name="PhilipsMiniwattComparisonList1939" />{{rp|91}}*'''X''' – ''[[Acorn tube]]''*'''Y''' – 8-pin Continental European base, originally German ''steel tubes'' {{H:title|also known as|aka}} "German Metal Octal"On cartons and tube lists, this basing code was followed by a number giving the maximum envelope diameter in mm:*'''AD1N''' – AD1 with a half-indirect 4 V/2 A heater*'''215A''' (Western Electric) = '''4215A''' (STC/Brimar) – Directly heated miniature AF/IF/detector triode, 1 V/250 mA filament, ''Peanut'' 4-stub bayonet base*'''703A''' (WE, Tung-Sol) – 20 W Directly heated ''Doorknob'' UHF power triode up to 1.5 GHz, 1.15 V/4.5 A filament;<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/703a.pdf |publisher=[[Western Electric]] |title=703A Technical information |access-date=28 May 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/127/7/703A.pdf |publisher=[[Tung-Sol]] |title=703A data sheet |date=15 December 1943 |access-date=3 March 2021}}<!-- http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/703A-TS_Datasheet.pdf --></ref> 368AS with tightened [[Cut-off (electronics)#Tubes|cut-off]] specs*'''705A''' (WE, GE, Raytheon, Tung-Sol) = '''8021''' (378A) – 30 kV, 100 mA Half-wave [[High voltage|EHT]] rectifier with electrodes supported directly from the hard glass envelope, no internal insulators, 5 V/5 A filament, B4A 4-pin base with anode top cap<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/705a(44).pdf |publisher=[[Western Electric]] |title=705A Technical information |date=27 January 1944 |access-date=27 May 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/127/7/705A.pdf |publisher=[[Tung-Sol]] |title=705A data sheet |date=15 December 1943 |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/re/re085.php?l=e Lampes-et-tubes]</ref>*'''708A''' (WE, Tung-Sol) – ''Flying saucer tube'', a directly heated SHF power triode, [[Gain (electronics)|μ]]=10, grid connected to the flanged steel body, 1.7 V/1.85 A filament, used as [[Valve RF amplifier#Grounded grid amplifier|grounded-grid]] RF amplifier or mixer in 1...3 GHz radar receivers<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/708a.pdf |publisher=[[Western Electric]] |title=708A Technical information |access-date=28 May 2021}} • on [http://www.r-type.org/exhib/acl0048.htm r-type.org] • on [https://www.radiomuseum.org/tubes/tube_708a.html radiomuseum.org] • on [http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/708A/708A.pdf edelpro]</ref>*'''710A''' (WE) = '''8011''' – ''[[Micropup]]'' UHF power triode<ref>{{cite web |url=http://www.tubecollectors.org/we/archives/710a.pdf |publisher=[[Western Electric]] |title=710A Technical information |access-date=28 May 2021}}</ref>*'''715B/C''' (WE, Raytheon) (5D21) – 60 W Hard pulse modulator tetrode, U<sub>Amax</sub> = 15 kV, half-indirect 26 V/2.1 A heater, B4A 4-pin base with anode top cap<ref name="bstj26-4-818" /><ref>{{cite web |url=http://www.tubecollectors.org/we/archives/715b.pdf |publisher=[[Western Electric]] |title=715B Technical information |date=13 November 1943 |access-date=28 May 2021}} • {{cite web |url=https://frank.pocnet.net/sheets/049/7/715C.pdf |publisher=[[RCA]] |title=715C data sheet |access-date=3 March 2021}}</ref>*'''716A''' (WE) – Thyratron; superseded by 722A*'''[[WD-11]]''', '''WD-12''' (UV4 base), '''WX-12''' (UX4 base) – Directly heated amplifier/detector triodes, 1.1 V/250 mA filament*'''V99''' = '''UV-199''' – Directly heated low-mu amplifier/detector triode, 3.3 V/60 mA filament; '''X99''' with a 4-stub bayonet base and a different pinout*'''4J42''' – 40 kW Magnetron, 660 to 730 MHz<ref name="bstj25-2-167">{{cite web |url=https://archive.org/details/bstj25-2-167 |title=The Magnetron as a Generator of Centimeter Waves |series=The [[Bell System]] technical journal |date=April 1946 |author1=Fisk, J.B. |author2=Hagstrum, H.D. |author3=Hartman, P.L. |access-date=18 April 2021}}</ref>{{rp|287ff}}*'''7NP4''' ({{cvt|60|ft|m|0}} projection distance), '''7WP4''' ({{cvt|80|ft|m|0}} projection distance) – 7" Theatric [[CRT projector|projection CRTs]], 75 kV anode voltage, considerable [[X-ray tube#Hazards of X-ray production from vacuum tubes|X-radiation]], magnetic deflection, P4 white, medium-persistence, cast a {{cvt|20|×|15|ft|m|1}} image*'''12L8GT''' – Common cathode dual power pentode, Octal base, for use as a parallel-connected or push-pull output stage*'''12SC7''' – High-mu dual triode, 12.6 V/150 mA heater, for use as AF amplifier or phase inverter*'''EL862''' – Power pentode*'''EL863''' – Power pentode*'''XQ1010''' – 1" ''[[Video camera tube#Vidicon|Vidicon]]'', resolution ≥600 TV lines*'''XQ1020''' ([[Black and white|B/W]]), '''XQ1020L''' (luminance channel), '''XQ1020B''' (blue channel), '''XQ1020G''' (green channel), '''XQ1020R''' (red channel) – {{cvt|6⁄5|in|mm|0|order=flip}} Color TV broadcast-grade ''[[Video camera tube#Plumbicon (1963)|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, [[Antimony trisulfide|Sb<sub>2</sub>S<sub>3</sub>]] target*'''XQ1040''', '''XQ1050''' (for [[telecine|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*'''XQ1270''' (≥400 TV lines), '''XQ1271''' (≥550 TV lines), '''XQ1272''' (≥500 TV lines) – ⅔" Commercial-grade ''Vidicon'', Sb<sub>2</sub>S<sub>3</sub> target, overall length {{cvt|4+1⁄4|in|cm|1|order=flip}}*'''XQ1274''' – ⅔" ''[[Video camera tube#Newvicon (1973)|Newvicon]]'', magnetic focussing and deflection, [[Zinc selenide|ZnSe]] + [[Cadmium zinc telluride|CdZnTe]] target, for use in low-light security cameras, resolution ≥650 TV lines*'''XQ1275''' – ⅔" ''Newvicon'' camera tube*'''XQ1285''' – 1" ''Vidicon'', magnetic focusing and deflection, precision electron gun, Sb<sub>2</sub>S<sub>3</sub> 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, Sb<sub>2</sub>S<sub>3</sub> target, for use with X-ray image intensifiers in medical equipment*'''XQ1340''' – ''Electron Bombarded Silicon Tube'', a low-light ''Vidicon'' with a silicon target<ref name="AEG_EBSi">{{cite web |url=https://frank.pocnet.net/other/AEG-Telefunken/AEG-Telefunken_ImageIntensifierTubes_more.pdf |title=Image Intensifier Tubes, Infrared Image Converter, EBSi-Camera Tube |publisher=[[AEG]]-[[Telefunken]] |access-date=2 April 2021}}</ref>*'''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, [[Gamma correction|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''*'''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*'''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<ref name="Mullard_NightVision">{{cite web |url=https://frank.pocnet.net/other/Mullard/Mullard_NightVision_XX1500_1980.pdf |title=Mullard Night Vision |publisher=[[Mullard]] |access-date=2 April 2021}}</ref>*'''XX1066''' – 1. Gen. 3-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''XX1190''' – 1. Gen. inverter, 1-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''XX1200''' – 1. Gen. inverter, 1-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''XX1211''' – 1. Gen. 3-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''XX1400''' – 2. Gen. inverter, 1-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''XX1430''' – 1. Gen. inverter, 1-stage image intensifier, S25, P20<ref name="AEG_EBSi" />*'''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*'''1611''' – Power pentode for use in maritime, automatic {{Overline|[[SOS]]}} [[Ship's emergency transmitter|transmitters]]; 6F6 with tightened specs*'''1613''' – 17.6 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*'''1625''' – Indirectly heated RF beam power tetrode, 12.6 V/450 mA heater, [[Dielectric loss|low loss]] [[mica]]-filled [[Phenol formaldehyde resin|phenolic resin]] ("Micanol")<ref name="Micanol" /> Octal base with anode on top cap; very similar to type 807*'''1629''' – [[Magic eye tube|Tuning indicator]] tube with DC amplifier triode unit; 6E5 with an Octal base and a 12.6 V/150 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 cathode dual triode, Octal base, used in World War II aircraft; 6SN7 with a 25 V/150 mA heater*'''1634''' – 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*'''1640''' = '''6405''' – Gas-filled, low-microphonics [[phototube]], [[Photocathode|caesium-coated cathode]] with spectral S1 response (red/infrared, maximum sensitivity at 800 nm), 4-pin base, for industrial applications such as [[Bottling line|electronic bottle/ampoule inspection equipment]]*'''1644''' – Dual power pentode; 12L8GT with tightened specs*'''1654''' – 7 kV, 1 mA Half-wave rectifier, Miniature 7-pin base with anode on top cap*'''1699''' – Indirectly heated hexode [[monoscope]], 6-pin base with dual top caps for #4 grid and anode; 2F21 with a customer-supplied [[Test card|test pattern]]*'''711A''' (WE) – "Oscillator (British)" <ref name="MIL-HDBK-213A" />{{rp|179}}*'''712A''' (WE) – Reflex Klystron, superseded by 707A<ref name="MIL-HDBK-213A" />{{rp|179}}*'''812A''' – Directly heated RF power triode, 6.3 V/4 A filament, giving 100 W up to 30 MHz and 55 W at 100 MHz*'''816''' – [[Mercury-arc valve|Mercury-vapor rectifier]], 7.5 kV anode voltage, 125 mA anode current, 2.5 V/2 A filament*'''826''' – Directly heated RF power triode, center-tapped 7.5 V/4 A filament, giving 22 W at 250 MHz*'''827R''' – Forced-air cooled, directly heated beam power tetrode giving 400 W up to 110 MHz, 7.5 V/25 A filament*'''828''' – 70 W Directly heated VHF beam power tetrode, 10 V/3.25 A filament, low loss mica-filled phenolic resin ("Micanol") 5-pin base, anode on top cap*'''832''' – Indirectly heated dual VHF beam power tetrode, center-tapped 12.6 V/800 mA heater*'''835''' – Directly heated power triode; 211 with a reduced grid-to-anode capacitance*'''846''' – 2.5 kW Water-cooled RF power triode, 11 V/51 A filament*'''858''' – 15 kW Water-cooled RF power triode, 22 V/52 A filament*'''859''' – 20 kW Water-cooled RF power triode, 22 V/71 A filament*'''868''' – Gas-filled [[phototube]], [[Photocathode|caesium-coated cathode]] with spectral S1 response (red/infrared, maximum sensitivity at 800 nm), 4-pin base*'''869''' – Mercury-vapor rectifier with a peak inverse voltage of 20 kV and peak anode current of 10 A, average anode current 2.5 A, forward drop 17 V, 5 V/19 A heater*'''870B''' – Forced-air cooled mercury-vapor rectifier with a peak inverse voltage of 16 kV and peak anode current of 450 A, average anode current 75 A, 5 V/65 A heater<ref name="RCAtx1942">[https://frank.pocnet.net/other/RCA/RCA_Guide_for_Transmitting_Tubes_1942.pdf RCA Guide for Transmitting Tubes (July 1942, 172MB)]</ref>{{rp|43}}*'''878''' – [[Cathode-ray tube|CRT]] [[High voltage|EHT]] rectifier with a peak inverse voltage of 20 kV and average anode current of 5 mA, 2.5 V/5 A heater, 4-pin base with anode top cap*'''880''' – 20 kW Water and forced-air cooled RF power triode, 12.6 V/320 A filament*'''881''' – Mercury-vapor rectifier with a peak inverse voltage of 15 kV and peak anode current of 15 A, average anode current 5 A, forward drop 20 V, 5 V/9.5 A heater*'''887''' ([[Gain (electronics)|μ]]=10), '''888''' (μ=30) – 800 W, 225 MHz Water-cooled RF power triode, 11 V/24 A filament<ref name="RCAtx1942" />{{rp|42}}*'''889''' (Water-cooled), '''889R''' (Air radiator) – 5 kW RF Power triode, 11 V/125 A filament*'''891''' (5 kW, Water-cooled), '''891R''' (Air radiator), '''892''' (7.5 kW, Water-cooled), '''892R''' (Air radiator) – RF Power triode, center-tapped 22 V/60 A filament for e.g. two-phase operation*'''899A''' – 20 kW Water-cooled RF power triode, 14.5 V/180 A filament*'''D''' – ''Bialkali'' [[potassium]]-antimony-caesium cathode, spectral response from UV to red:'''DU''' – "D" with a [[Fused quartz|Silica]] window for UV detection*'''SBU''' – [[Solar-blind technology|''Solar-blind'']] caesium-[[telluride (chemistry)|telluride]] cathode, spectral response from [[Ultraviolet#Subtypes|UV-B to Vacuum UV]], peak sensitivity 235 nm (UV-C), Silica window:'''TU''' – "T" with a Silica window for UV detection*'''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*'''14BCP22''' – 14" (36 cm) Color CRT, 50° × 70° magnetic deflection, P22 [[RGB color model|RGB]], medium-persistence*'''6J10/6Z10''' – Compactron [[Detector (radio)#Quadrature detector|Quadrature detector]] pentode + power pentode, used as FM audio demodulator and power stage; cf. 6BN6, 6DT6, nonode*'''4BN6''' – ''Gated-beam discriminator'' pentode, used in [[Detector (radio)#Quadrature detector|FM quadrature detector]]s; 3BN6, 6BN6, 12BN6 with a different heater*'''4DT6''' – Quadrature detector pentode used in FM audio demodulators; 3DT6, 6DT6 with a different heater*'''13J10/13Z10''' – ''Compactron'' [[Detector (radio)#Quadrature detector|Quadrature detector]] pentode + power pentode, used as FM audio demodulator and power stage; 6J10/6Z10, 10Z10 with a different heater*'''EA41''' – 150 V, 9 mA Diode, 4-pin Rimlock base*'''EA71''' – Diode, all-glass elliptical cross-section body, flat 5-pin base*'''ECC813''' (6463) – Separate cathodes, dual triode for computer circuits, heaters internally series-connected, with the midpoint on a separate pin, Noval base*'''ECC863''' – Separate cathodes, dual triode with an internal screen between the sections*'''ECF803''' – ECF801/6GJ7 with separate cathodes*'''EL61''' – Power pentode, B9G 9-pin Loctal base*'''ORP23''' – CdS photoresistor, top window, 2-pin base, max. sensitivity at λ = 675 nm*'''ORP80/RPY13''' – [[Resistive opto-isolator|''Vactrol''-type opto-isolator]], a small 24 V/60 mA incandescent lamp surrounded by four 200 V<sub>max</sub> CdS photoresistors in a black-tinted glass envelope, Noval base<ref>RPY13 etc. [https://nfor.nl/images/uploaded/201801201838195a638c9bc0c9a.jpg short form data]</ref>*'''300A''' – 40 W Directly heated AF power triode, 5 V/1.2 A filament, 4-pin base*'''[[300B]]''' – 36 W version of the 300A, 4-pin base with the lateral bayonet pin rotated by 45° <ref>{{cite web |url=http://www.tubecollectors.org/we/archives/300a(39).pdf |publisher=[[Western Electric]] |title=300A and 300B Vacuum Tubes |year=1939 |access-date=5 June 2021}}</ref> so it could replace the 205A [[File:Commons-logo.svg|16x16px|link=:Commons:Category:300B|class=noviewer|alt=]]*'''CK1362''' – Controlled-persistence 10" [[Cathode-ray tube|CRT]] with a blue-fluorescence, infrared-stimulable [[phosphor]] capable of storing electron beam energy and later release it in the form of yellow-green phosphorescence when irradiated with IR in the 1 µm range*'''OME1199E2''' (27cm, 10"),<ref name=T_CSF_Image>{{cite web |url=https://frank.pocnet.net/other/ThomsonCSF/ThomsonCSF_TubesEtDispositifsAImage_2_1977.pdf |title=''Image and Display Tubes 1977'' part 2 (193MB) |publisher=[[Thomson-CSF]] |access-date=12 March 2021}}</ref>{{rp|216ff}} '''OME1269E21''' (40cm, 16")<ref name=T_CSF_Image />{{rp|220ff}} – ''[[Penetron]]''-type red-to-green limited-[[gamut]] CRT*'''SC2795''', '''SC3863''' (3", 7.6cm), '''SC3144''', '''SC3154''' (9", 23cm) – [[Cathode-ray tube|CRT]]s with an unphosphored front glass but with fine wires embedded in it for use as [[Printer (computing)#Liquid ink electrostatic printers|electrostatic print head]]s; the wires would pass the electron beam current through the glass onto a sheet of paper where the desired content was therefore deposited as an electrical charge pattern. The paper was then passed near a pool of liquid ink with the opposite charge. The charged areas of the paper attract the ink and thus form the image; cf. CK1366, CK1367, CK1368, CK1369*'''SC3304''' (3"), '''SC3507''', '''SC3800''', '''SC3876''' (10", 25cm), '''SC3850''' (5", 13cm) – CRTs with a fiberoptic faceplate for use as [[Black and white|B/W]] photoprinter heads, P11 blue, short-persistence [[phosphor]]*'''SC3093''' – 3" [[Character generator]] [[monoscope]] for [[text mode]] video rendering in [[Video display terminal#Early VDUs|early computer monitors]] and electrostatic printers, with a 2×2" (5×5cm) square target having letters, digits and symbols patterned on it in a customer-supplied 8×8 array. An electron beam selects and scans a character, both by appropriate electrostatic deflection, and generates an [[Luma (video)|analog video signal]]; cf. 4560, CK1414, TH9503*'''SC3185''' (21", 53cm, P4 white), '''SC3369''' (16", 41cm, P7 blue/yellow, short/long-persistence), '''SC3821''' (7", 18cm, P14 purple/orange, medium/long), '''SC3875''' (19", 48cm, P14) – ''Character Writing Tube'', CRTs with both magnetic deflection for character positioning, and electrostatic deflection for character writing from SC3093 output*'''SC4876''' (21"), '''SC4899''' (8", 20cm) – ''[[Penetron]]''-type red-to-white limited-[[gamut]] CRTs*'''TH8102E20''' (24cm, 9"),<ref name=T_CSF_Image /> '''TH8104E21''' (54cm, 21")<ref name=T_CSF_Image />{{rp|165ff}} – ''[[Penetron]]''-type red-to-green limited-[[gamut]] CRT*'''MT7A''', '''MT7B''' – 12 kV, 600 W Radiation-cooled power triodes with a [[molybdenum]] anode, 15 V/10 A filament,<ref name="MarconiSaga">{{cite book |last1=Jessop |first1=George R. |last2=Vyse |first2=Barry |year=2000 |title=The Saga of Marconi Osram Valve |publisher=Vyse Books Ltd., Pinner, Middlesex, UK |isbn=0-9539127-0-1}} In: {{cite magazine |url=https://www.bvws.org.uk/publications/bulletins/pdf/BVWS_Bulletin_24_4.pdf |title=Extracts, part 1 |publisher=The British Vintage Wireless Society |magazine=BVWS Bulletin |volume=24 |issue=4 |pages=12ff |access-date=1 May 2017}} • {{cite magazine |url=https://www.bvws.org.uk/publications/bulletins/pdf/BVWS_Bulletin_25_1.pdf |title=Extracts, part 2 |magazine=BVWS Bulletin |volume=25 |issue=1 |pages=9ff |access-date=6 February 2021}} • {{cite magazine |url=https://www.bvws.org.uk/publications/bulletins/pdf/BVWS_Bulletin_25_3.pdf |title=Extracts, part 3 |magazine=BVWS Bulletin |volume=25 |issue=3 |pages=18ff |access-date=6 February 2021}}</ref>*'''ИН-9''' ⟼ '''IN-9''' – Neon-filled bar graph indicator, a glass tube with a short anode and a long wire cathode that glows partially; the glow length is proportional to the tube current; cf. [[#OET|{{color|Green|GEC TuneOn}}]]*'''ИН-13''' ⟼ '''IN-13''' – ИН-9 with a starter cathode and a segmented indicating cathode<ref>{{cite web |url=http://lampes-et-tubes.info/cd/IN-13a.pdf |title=ИН-13 data sheet |language=ru |access-date=14 February 2021}} on [http://lampes-et-tubes.info/cd/cd003.php?l=e lampes-et-tubes.info]</ref>Ballast tubes/resistors and barretters were designated the following subset:*<Voltage>'''A1''' to <Voltage>'''Z1''' – No filament tap, no jumper*<Voltage>'''A2''' – Filament tap for two pilot lights*<Voltage>'''B2''' – Filament tap for one pilot light*'''1D2''', '''1E2''' – With a jumper to unpower the device when the ballast is pulled from its socket;[[Cathode-ray tube|Monochrome CRTs:]]*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 [[oscilloscope]]s, [[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*'''4DP1''', '''4DP2''', '''4DP7''', '''4DP11''' – Dual-beam 4" CRT for use in oscilloscopes, electrostatic deflections*'''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*'''8CP1''', '''8CP2''', '''8CP4''', '''8CP5''' (blue, very short), '''8CP7''', '''8CP11''' – 8" (20 cm) CRT for use in oscilloscopes, electrostatic deflection*'''30BP4''' – 30" (76 cm) CRT used in 1950s premium television receivers, 90° magnetic deflection, P4 white, medium-persistence*'''12AD6''' – Low (10.0-15.9 V) anode voltage sharp-cutoff heptode [[pentagrid converter]]*'''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*'''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 version of 6J7/EF37 with suppressor plates connected 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*'''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 [[Electrical grid#Voltage|stable power grid]]*'''42A2''', '''49A2''', '''55A2''', '''80A2''', '''86A2''', '''92A2''' – Straight ballast resistors with tap for 2 pilot lights*'''42B2''', '''49B2''', '''55B2''', '''80B2''', '''86B2''', '''92B2''' – Straight ballast resistors with tap for 1 pilot light*'''59''' – 3 W Power pentode, 2.5 V/2 A heater, UX7 based. Three modes of operation available::#Standard pentode circuit for use as single-tube [[Power amplifier classes#Class A|Class-A]] audio driver:#Grids 2 and 3 tied to anode (triode strap) for use as single-tube Class-A audio driver:#Grids 1 and 2 connected together, Grid 3 tied to anode for use as push-pull Class-B output*'''89''' – 3.4 W Power pentode, 6.3 V/400 mA heater, UX6 based. Three modes of operation available::#Standard pentode circuit for use as single-tube [[Power amplifier classes#Class A|Class-A]] audio driver:#Grids 2 and 3 tied to anode (triode strap) for use as single-tube Class-A audio driver:#Grids 1 and 2 connected together, Grid 3 tied to anode for use as push-pull Class-B output[[Burroughs Corporation|Burroughs]] Neon-filled planar [[Dekatron|glow-transfer]] [[Plasma display#History|plasma bar graph displays]]:*'''BG08220-K''' – 120-Segment circular with five cathode strings plus a Reset cathode, 1-in-5 major/minor [[Graduation (instrument)|graduation]], for use e.g. in [[Direction finding|direction-finding]] equipment*'''10ЛО105А''' ⟼ '''10LO105A''' – [[Traveling-wave tube|TWT]]/[[Cathode-ray tube|CRT]] combination;<ref>{{cite web |url=http://lampes-et-tubes.info/cr/10LO105A.pdf |title=10ЛО105А data sheet |language=ru |access-date=14 February 2021}} on [http://lampes-et-tubes.info/cr/cr168.php?l=e lampes-et-tubes.info]</ref> cf. 6762 ''Wamoscope''*'''22ЛО1А''' ⟼ '''22LO1A''' – 5-Beam CRT<ref>{{cite web |url=http://lampes-et-tubes.info/cr/cr062f.jpg |title=22ЛО1А data sheet |language=ru |access-date=14 February 2021}} on [http://lampes-et-tubes.info/cr/cr062.php?l=e lampes-et-tubes.info]</ref>*'''ИГТ1-203Р''', '''ИГТ2-203Р''', '''ИГТ3-203Р''' ⟼ '''IGT1-203R''' (1-in-5 Major/minor [[Graduation (instrument)|graduation]]), '''IGT2-203R''' (flat graduation), '''IGT3-203R''' (1-in-10 arced graduation) – Neon-filled, planar, 203-segment linear [[Dekatron|glow-transfer]] [[Plasma display#History|plasma bar graph displays]] with five cathode strings<ref>{{cite web |url=http://lampes-et-tubes.info/cd/IGT1-203R_b.pdf |title=ИГТ1-203Р data sheet |language=ru |access-date=14 February 2021}} on [http://lampes-et-tubes.info/cd/cd155.php?l=e lampes-et-tubes.info]</ref>*'''<none>''' or '''R''' – Resistive element ([[Electrical ballast#Self-variable resistors|ballast tube]]/[[Iron-hydrogen resistor|barretter]])::*B9D Magnoval {{small|(E55L)}}::—Before the 1950s:::*'''162''' – Y8A ''Steel tube'' 8-pin {{small|(EC162)}}:*'''Microwave tubes:''' Output power <1W; signal device for use as intermediate amplifier or [[RF front end|low-noise receiver front end]]:*'''Microwave tubes:''' Output power ≥1W; power device for use in transmitters:—'''Klystrons:''' Output power in W*'''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—Microwave tubes:*'''HKR''' – [[Sutton tube|Reflex Klystron]]*'''HMD''' – [[Continuous wave|CW]] [[Cavity magnetron|Magnetron]]*'''HMI''' – Pulse Magnetron*'''HRO''' – [[Backward-wave oscillator]]*'''HSE''' – [[Duplexer|TR cell]]*'''HSS''' – ATR cell*'''HT''' – Triode*'''HTG''' – Triode oscillator*'''HWE''' – Signal [[traveling-wave tube]]*'''HWL''' – Power traveling-wave tubeThen a sequentially assigned number, the first one or two digits of which give the frequency in GHz.*'''RA0007A''' (Octal base), '''RA0007B''' (Noval base) – 600 V, 700 µA Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, 1.4 V/3.5 A<sub>max</sub> uncoated tungsten filament, usable as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, or as an [[True RMS converter|RMS heating current-to-DC anode current converter]], or as a [[Noise generator|noise diode]]; cf. 5845, YA1000 [[File:Commons-logo.svg|16x16px|link=:Commons:Category:RA0007A|class=noviewer|alt=]]===Other systems===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 ([[#List of other letter tubes|{{color|Green|examples}}]]), who sometimes derived a letter prefix from the behavior of devices considered to be exceptional:Other systems grew into informal standards adopted by many manufacturers for their special-purpose/special-quality tubes:*'''[[#700s|{{color|Green|700s}}]]''' – Mainly [[Western Electric]]*'''[[#800s|{{color|Green|800s}}]]''' – Mainly [[RCA]]:*Low 800s – Mainly transmitter output types:*High 800s – Mainly (gas-filled) rectifiers and [[thyratron]]s*'''[[#900s|{{color|Green|900s}}]]''' – Mainly RCA:*Low 900s – Mainly phototubes and photomultipliers:*High 900s – Mainly [[Acorn tube]]s*'''[[#1600s|{{color|Green|1600s}}]]''' – Mainly RCA*'''[[#9000s|{{color|Green|9000s}}]]''' – Mainly RCA VHF/UHF tubes*'''HY''' – [[CBS#Conglomerate|CBS]]/Hytron (Salem, Massachusetts, USA)*'''KU''' – ITT/Kuthe Laboratories (Newark, New Jersey, USA)*'''NL''' – Eimac/National Electronics, Inc. (Geneva, Illinois, USA)*'''1D3''' – [[Control grid#Effects of grid position|Low-mu]] UHF triode, all-glass round cross-section body, circular 8-pin/pigtails base;[[Electrical ballast#Self-variable resistors|Ballast tubes]]*'''4A1''' – 300 mA filament*'''7E5''' – Medium-mu RF triode*'''7F8''' – Medium-mu VHF triode, used as FM RF amplifier and converter*'''5845''' – Directly heated, dual 300 V, 1 mA [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, center-tapped 5 V/435 mA<sub>max</sub> uncoated tungsten filament, usable as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits, or as an [[True RMS converter|RMS heating current-to-DC anode current converter]], or as a [[Noise generator|noise diode]]; cf. Tesla RA0007, YA1000*'''7296''' – Miniature ceramic/metal disk-seal planar UHF triode for use on [[Printed circuit board|PCB]]s*'''7486''' – Miniature ceramic/metal disk-seal planar UHF triode*'''7588''' – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs*'''7625''' – Miniature ceramic/metal disk-seal planar AF triode for use on PCBs*'''7720''' – Miniature ceramic/metal disk-seal planar UHF triode for use on PCBs*'''8081''' – Miniature ceramic/metal disk-[[Cermet#Ceramic-to-metal joints and seals|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'''[[Iron–hydrogen resistor|Barretters]]''' with a side-contact 8 baseThe six free pins were used as [[Jumper (computing)|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 [[Inrush current limiter|surge-limiting]] [[Uranium dioxide|''Urdox'' (UO<sub>2</sub>)]] power [[thermistor]]*'''C8''' – 80 to 200 V filament*'''C9''' – 35 to 100 V filament*'''C10''' – 35 to 100 V filament*'''C12''' – 80 to 200 V filament*'''DC703''' – Subminiature UHF triode, all-glass round cross-section body, circular 5-pin/pigtails base*'''DL650''' = Raytheon '''CK532DX''' – 45 mW Subminiature power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, U<sub>Amax</sub> = 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 pigtailed*'''DLL21''' (Octal base), '''DLL25''' (B8G Loctal base) – 1.5 W Dual AF power pentode, center-tapped, 2.8 V/100 mA (series) or 1.4 V/200 mA (parallel) filament*'''DLL31''' – DLL21 with a different pinout*'''EC162''' – RF power triode, Y8A ''steel tube'' base*'''EC866''' – Low-noise UHF triode, Noval base*'''EF861''' – Wideband pentode*'''EF866''' – AF pentode*'''EF905''' = E95F/6AK5W/5654*'''E91H/6687''' – Dual-control heptode with a [[Passivation (chemistry)|passivated]] third grid to reduce [[Secondary emission#Undesirable effects - the tetrode|secondary emission]], for use as a [[NAND gate]] in a [[coincidence circuit]]*'''GA560''' – Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]], vacuum [[Noise generator|noise diode]], 2.5 to 3,5 V/1.9 to 2.2 A uncoated, thorium-free tungsten filament, all-glass, 3-pin base*'''K81A''' – Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]], vacuum VHF noise diode, 2.5 A<sub>max</sub> uncoated tungsten filament, Noval base;[[Iron–hydrogen resistor|Barretters]]*'''YA1000''' – 5 kV, 5 mA Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, 4.3 V/325 mA<sub>max</sub> uncoated tungsten filament, Noval base, for use as an [[True RMS converter|RMS heating current-to-DC anode current converter]] in AC voltage/current stabilizer circuits;<ref>{{cite book |author=<!--Staff writer(s); no by-line.--> |title=Wechselspannungs- und Wechselstrom-Stabilisierungsschaltungen mit der Diode YA1000 |pages=189–195 |series=Telefunken Laborbuch |volume=IV |language=de |publisher=AEG-Telefunken |location=Ulm |year=1967}} ([https://www.radiomuseum.org/images/tubeenvdiag_klein/ya_1000_sch.png principal circuit])</ref> cf. 5845, Tesla RA0007*'''29C1''' – 100 V, 3 mA Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, 4 V/800 mA<sub>max</sub> uncoated tungsten filament, for use as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits; cf. 5845, YA1000*'''217C''' – Directly heated half-wave vacuum rectifier*'''279A''', '''379A''' – 1.75 kW, Directly heated AF/RF power triode*'''303A''' – Indirectly heated dual diode + triode, 6-pin base*'''304B''' – 50 W, 300 MHz Directly heated VHF power triode, 4-pin base, anode and grid on top wires*'''305A''' – 60 W, 50 MHz Directly heated VHF power tetrode, 4-pin base, anode and both grids on top wires*'''306A''' – 15 W Directly heated RF/AF power pentode, 4-pin base, grid 3 internally tied to filament center-tap, grid 1 on top cap*'''307A''' – 15 W Directly heated RF/AF power pentode, 5-pin base, anode on top cap*'''309A''' – Remote-cutoff IF/AF pentode, 5-pin base, grid 1 on top cap*'''319A''' – See 267B*'''327A''' (2 A Half-wave), '''328''' (1.3 A Full-wave), '''367''' (6 A Full-wave) – Argon-filled ''[[Rectifier#Tungar|Tungar bulb]]'', a low-voltage rectifier for charging 12V lead-acid batteries*'''342A''' – 25 kW, 4 MHz Water-cooled, directly heated power triode*'''343A''' – 10 kW, 4 MHz Water-cooled, directly heated power triode*'''344H''' = '''8111''' – 3.35 to 3.65 GHz, 1.5 kW [[Traveling-wave tube]]*'''348A''' (grid 1 on top cap), '''349A''' – Pentode, 7-pin base*'''354''' (Philips) – 2 A Half-wave argon-filled ''Tungar bulb'' for charging 8V lead-acid batteries*'''354A''' (Western Electric) – 1.5 kV, 4 A Argon/Mercury-vapor thyratron, 5-pin base;<ref name="WE287A_323A_354A_355A" /><ref>{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/!5-Numbers-100--999/354A_WE_Datasheet.pdf |title=354A Electron Tube |publisher=[[Western Electric]] |date=October 1962 |access-date=11 June 2021}}</ref>*'''356A''' (880, 5771, 7085) – 22.5 kW, 25 MHz Water-cooled, directly heated power triode*'''357B''' – 400 W, 100 MHz Forced-air cooled, directly heated power triode*'''371B''' – 25 kV, 300 mA Directly heated half-wave rectifier, Jumbo 4-pin base*'''376B''' = '''5589''' – Gas-filled cold-cathode trigger triode, one starter electrode, 6-pin base*'''393A''' – 1.25 kV, 1.5 A Argon/Mercury-vapor thyratron*'''396A''' = '''2C51''' – Dual shielded triode, indirectly heated, Noval base*'''398A''' = '''5603''' – 8 W Directly heated power pentode, Octal base*'''400''' – 100 V, 25 mA Half-wave rectifier, 4-pin base, designed for studies of emission and the influence of magnetic fields*'''401A''' = '''5590''' – Pentode, Miniature 7-pin base*'''403B''' = '''5591''' – UHF pentode, Miniature 7-pin base*'''404A''' = '''5847''' – 120 MHz Wide band frame-grid pentode, Noval base*'''407A''' (2C51, 5670) – Dual medium-mu VHF triode, center-tapped 40 V/50 mA resp. 20 V/100 mA heater, Noval base; cf. 20EZ7*'''408A''' – Sharp-cutoff pentode, Miniature 7-pin base*'''411''' – 150 kV ([[Transformer oil|in oil]]) resp. 100 kV (in air), 300 mA<sub>peak</sub> Half-wave rectifier, 4-pin base*'''417A''' – Medium-mu triode, Noval base*'''418A''' – IF/Video tetrode*'''423A''' – 100 V, 4 to 8 mA [[Voltage-regulator tube]], Noval base*'''427A''' = '''6141''' – 100 V, 5 to 40 mA Voltage-regulator tube with a keep-alive (primer) electrode, Noval base*'''430A''' – Gas-filled cold-cathode trigger triode, one starter electrode, [[Radium bromide|RaBr<sub>2</sub>]] keep-alive, 4-pin base*'''502A''' – 600 V, 100 mA Thyratron*'''530''' – 75 kW Water-cooled, directly heated pulsed power triode*'''531''' – 50 kV, 390 mA Forced-air cooled, directly heated, half-wave vacuum rectifier*'''543''', '''558''', '''576A''', '''577''', '''578''', '''582''', '''583''', '''593''' – Directly heated half-wave vacuum rectifiers*'''546''' – 500 V, 20 mA Thyratron, Miniature 7-pin base*'''561''' – 33 kV, 1.25 A Directly heated vacuum rectifier, 4-pin Superjumbo base with anode top cap*'''572B''' (811A) – 225 W Directly heated RF power triode, 6.3 V/4 A filament*'''575A''' (4-pin Jumbo base), '''673''' (4-pin Superjumbo base) – 15 kV, 1.5 A [[Mercury-arc valve|Mercury-vapor rectifier]]s*'''596''' – Directly heated full-wave vacuum rectifier===='''600'''s====*'''604''' = '''7014''' (4-pin Superjumbo base), '''604L''' = '''7015''' ([[Lug (electrical connector)|Lug/spade connectors]]) – 900 V, 2.5 A Full-wave Argon/Mercury-vapor rectifier*'''606''' = '''7016''' (4-pin Superjumbo base), '''606L''' = '''7017''' (Lugs) – 900 V, 6.4 A Full-wave Argon/Mercury-vapor rectifier*'''615''' = '''7018''' – 2 kV, 2.5 A Half-wave Argon/Mercury-vapor rectifier*'''627''' – 1.25 kV, 640 mA Argon/Mercury-vapor thyratron, 4-pin Superjumbo base with anode top cap*'''629''' – 350 V, 40 mA Argon/Mercury-vapor thyratron, 5-pin base*'''632B''' – 1.5 kV, 2.5 A Mercury-vapor thyratron, 4-pin base with anode top cap and control grid side cap*'''635''' = '''7019''' (4-pin Superjumbo base), '''635L''' = '''7020''' (Lugs) – 1 kV, 6.4 A Half-wave Argon/Mercury-vapor rectifier with anode top cap*'''672''' – 2.5 kV, 2.5 A Argon/Mercury-vapor thyratron, 4-pin Superjumbo base with anode top cap*'''673''' – 10 kV, 1.75 A Half-wave Mercury-vapor rectifier, 4-pin Superjumbo base with anode top cap*'''676''' – 2.5 kV, 6.4 A Mercury-vapor thyratron, 4-pin Superjumbo base with anode top cap*'''677''' – 10 kV, 4 A Mercury-vapor thyratron, 4-pin Superjumbo base with anode top cap*'''678''' – 10 kV, 1.6 A Mercury-vapor thyratron, 4-pin base with anode top cap[[Western Electric]] types 700 to 732 were among 1940's most advanced technologies, and highly classified at the time<ref>{{cite web |url=http://www.hts-homepage.de/WesternElectric/WEsternElectric700.html |title=Western Electric 700er-Serie |language=de |access-date=7 January 2021}}</ref><ref name="MIL-HDBK-213A">{{IA|MIL-HDBK-213A|MIL-HDBK-213A}}</ref>{{rp|178-181}}<ref name="WesternElectricGeneral">[https://static1.squarespace.com/static/5f0983034219c6086e8100ac/t/5f456b4a7d659c36684d762e/1598384980530/Tubes+General.pdf Western Electric General September 10, 1946]</ref>{{rp|1038-1040}}*'''700A/B/C/D''' (WE) – Pulsed [[L band|L-band]] [[Cavity magnetron|Magnetron]], superseded by 4J42<ref name="bstj25-2-167" />{{rp|271ff}}<ref>[https://www.radiomuseum.org/tubes/tube_700a.html 700A on radiomuseum]</ref>*'''701A''' (WE) – 100 W Indirectly heated, hard pulse modulator tetrode<ref name="bstj26-4-818">{{cite web |url=http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/docs_pdf/bstj26-4-818.pdf |series=The [[Bell System]] technical journal |title=High-Vacuum Oxide-Cathode Pulse Modulator Tubes |author=C. E. Fay |access-date=11 April 2021 |url-status=live |archive-url=https://archive.org/details/bstj26-4-818 |archive-date=2013-01-19}}</ref>*'''702A''' (WE, Sylvania) – Three-element [[Duplexer|TR/ATR cell]]<ref>{{cite web |url=http://lampes-et-tubes.info/mwtr/702A.pdf |publisher=[[Western Electric]] |title=702A Technical information |access-date=3 March 2012}} • on [http://lampes-et-tubes.info/mwtr/mw015.php?l=e Lampes-et-tubes]</ref><ref name="bstj25-1-48">{{cite web |url=http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/Overview/docs/bstj25-1-48.pdf |series=The [[Bell System]] technical journal |title=The Gas-Discharge Transmit-Receive switch |author1=A. L. Samuel |author2=J. W. Clark |author3=W. W. Mumford |access-date=11 April 2021 |url-status=live |archive-url=https://archive.org/details/bstj25-1-48 |archive-date=2013-01-19}}</ref>*'''704A''' (WE) – 1.5 kV, 10 mA UHF diode, half-indirect 4.5 V/500 mA heater, ''Peanut'' 3-wire all-glass pigtailed, anode on top wire<ref>[http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/704A/704A.pdf 704A on edelpro]</ref>*'''706AY/GY''' (WE, Westinghouse) – 25 kW, 2.914-3.1 GHz Pulsed [[S band|S-band]] Magnetron;<ref>[http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/706A/706A.pdf 706 on edelpro]</ref> modernized 700*'''707A''' (WE) = '''QK26''' (Raytheon) – 2.5 to 3.75 GHz, 75 mW External cavity tuned S-band [[Sutton tube|Reflex Klystron]]<ref>{{cite web |url=http://lampes-et-tubes.info/mwkl/707A.pdf |publisher=[[Western Electric]] |title=707A Technical information |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwkl/mw007.php?l=e Lampes-et-tubes]</ref>*'''709A''' (WE) – TR/ATR cell<ref name="bstj25-1-48" />*'''710''' (RCA) = '''6011''' – 1.5 kV, 2.5 A Gas/Mercury-vapor [[thyratron]]<ref>{{cite web |url=https://frank.pocnet.net/sheets/049/7/710.pdf |publisher=[[RCA]] |title=710 data sheet |access-date=3 March 2021}}</ref>*'''713A''' (WE) – Indirectly heated ''Mushroom'' or ''Little Doorknob'' UHF pentode, [[Bakelite]] Octal base, 6.3 V/175 mA heater<ref name="713_717">{{cite web |url=https://frank.pocnet.net/sheets/127/7/713A.pdf |publisher=[[Tung-Sol]] |title=713A, 717A data sheet |access-date=3 March 2021}}</ref>, for use as a [[RF front end|low-noise front end]] in radar receivers; replaced by 6AK5/EF95*'''714''' (National Electronics, RCA) = '''7021''' – 1.25 kV, 1 A Argon/Mercury-vapor thyratron, 4-pin base with anode top cap<ref>{{cite web |url=https://frank.pocnet.net/sheets/201/7/7021.pdf |publisher=Eimac/National Electronics |title=714/7021 data sheet |access-date=3 March 2021}}</ref><ref>{{cite web |url=https://frank.pocnet.net/sheets/049/7/714.pdf |publisher=[[RCA]] |title=714/7021 data sheet |access-date=3 March 2021}}</ref>*'''714AY''' (WE) – S-band Magnetron;<ref>[http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/714A/714AY.pdf 714A on edelpro]</ref> further modernized 700*'''716''' (RCA) = '''6855''' – 1.25 kV, 1 A Gas/Mercury-vapor thyratron<ref>{{cite web |url=https://frank.pocnet.net/sheets/049/7/716.pdf |publisher=[[RCA]] |title=716/6855 data sheet |access-date=3 March 2021}}</ref>*'''717A''' (WE, Raytheon) (CV3594, VT269) – 713A with metal shield and a a [[Dielectric loss|low loss]] [[mica]]-filled [[Phenol formaldehyde resin|phenolic resin]] ("Micanol") Octal base;<ref>{{cite web |url=http://lampes-et-tubes.info/tt/717A(WE).pdf |publisher=[[Western Electric]] |title=717A Technical information |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/tt/tt318.php?l=e Lampes-et-tubes]</ref><ref name="713_717" /> replaced by 6AK5/EF95*'''718AY/EY''' (WE, Westinghouse) – S-band Magnetron; further modernization of the 700-type Magnetrons*'''719A''' (WE) – 25 kV, 500 mA Half-wave EHT 10A-pulse rectifier, half-indirect 7 V/7 A heater, B4A 4-pin base with anode top cap,<ref>[http://lampes-et-tubes.info/re/re278.php?l=e 719A on Lampes-et-tubes]</ref> used as a [[Clipper (electronics)|clipper]] in radar applications , not recommended as rectifier*'''720AY-EY''' (WE) – S-band Magnetron;<ref>[https://www.radiomuseum.org/tubes/tube_720.html 720AY on radiomuseum]</ref> AY variant replaced by 4J45; BY replaced by 4J46; CY replaced by 4J47*'''721A/B''' (WE, Raytheon, Sylvania) – TR/ATR cell<ref name="bstj25-1-48" /><ref>{{cite web |url=http://lampes-et-tubes.info/mwtr/721A.pdf |publisher=[[Western Electric]] |title=721A Technical information |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwtr/mw008.php?l=e Lampes-et-tubes]</ref>*'''722A''' (WE, [[Continental Electronics|Continental]]) – 2.5 kV, 640 mA Directly heated mercury-vapor thyratron, oxide-coated 3.6 V/8 A filament;<ref>[https://www.radiomuseum.org/tubes/tube_722a.html 722A on radiomuseum]</ref> similar to 287A*'''723A/B''' (WE, [[Kentucky Electrical Lamp Company|Ken-Rad]]) = '''2K25''' = '''KS9/20''' – 8.5 to 9.66 GHz, 20 mW [[X band|X-band]] Reflex Klystron<ref>{{cite web |url=http://lampes-et-tubes.info/mwkl/723A_B.pdf |publisher=[[Western Electric]] |title=723A/B Technical information |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwkl/mw002.php?l=e Lampes-et-tubes]</ref> used as [[local oscillator]]*'''724A/B''' (WE, Sylvania) – TR/ATR cell<ref name="bstj25-1-48" /><ref>{{cite web |url=http://lampes-et-tubes.info/mwtr/724B.pdf |publisher=[[Western Electric]] |title=724B Technical information |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwtr/mw010.php?l=e Lampes-et-tubes]</ref>*'''725A''' (WE, Raytheon) = '''2J21''' (Westinghouse) – 50 kW/180 W Pulsed X-band Magnetron<ref>{{cite web |url=http://lampes-et-tubes.info/mwma/725-A.pdf |publisher=[[Raytheon Technologies|Raytheon]] |title=725-A data sheet |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwma/mw118.php?l=e Lampes-et-tubes] • on [http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/725A/725A.pdf edelpro]</ref><ref name="2J48-51_2J55-56_4J50_4J52_4J78_725A_730A" />*'''726A/B/C''' (WE) – 2.883 to 3.173 GHz, 100 mW S-band Reflex Klystron,<ref>{{cite web |url=http://lampes-et-tubes.info/mwkl/726B.pdf |title=726B data sheet |access-date=3 March 2021}} • on [http://lampes-et-tubes.info/mwkl/mw005.php?l=e Lampes-et-tubes]</ref> variants differ in frequency only*'''727A''' (WE) – 140 V, 13 mA [[Cold cathode|Cold-cathode]] triode thyratron, all-glass pigtailed, used for relay service;<ref>[https://www.radiomuseum.org/tubes/tube_727a.html 727A on radiomuseum]</ref> replaced by 395A*'''728AY/GY''' (WE) – L-band Magnetron;<ref>[http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/728DY/728AY%20to%20JY.pdf 728 on edelpro]</ref> replaced by 4J51*'''729A''' (WE) = '''1B23''' – TR/ATR cell<ref>[https://www.radiomuseum.org/tubes/tube_729a.html 729A on radiomuseum]</ref>*'''730A''' (WE) – X-band Magnetron<ref name="2J48-51_2J55-56_4J50_4J52_4J78_725A_730A" /><ref>730A on [http://lampes-et-tubes.info/mwma/mw106.php?l=e Lampes-et-tubes] • on [http://www.ase-museoedelpro.org/Museo_Edelpro/Catalogo/tubes/records_nw/730A/730A.pdf edelpro]</ref>*'''731A''' (WE) = 6AK5/EF95 – IF pentode<ref>[https://www.radiomuseum.org/tubes/tube_731a.html 731A on radiomuseum]</ref>*'''732A''' (WE) = '''3B24''' – Half-wave EHT rectifier<ref>[https://www.radiomuseum.org/tubes/tube_732a.html 732A on radiomuseum]</ref>*'''740L''' = '''7022''' – 1.5 kV, 4 A Argon/Mercury-vapor thyratron, Lug connectors and anode top cap*'''760''' = '''6858''' (4-pin Superjumbo base), '''760L''' = '''7023''' (Lugs) – 1.5 kV, 6.4 A Gas/Mercury-vapor thyratron with anode top cap*'''787''' – ''Pliotron Demonstrator'', an educational, directly heated planar triode with a [[phosphor]]ized anode<ref>{{cite web |url=http://www.tubecollectors.org/west/archives/wl787.pdf |publisher=[[Westinghouse Electric (1886)|Westinghouse Electric]], Bloomfield, New Jersey, USA |title=Westinghouse demonstration tube type WL-787 |date=June 1936 |access-date=1 January 2021}}</ref>*'''879''' = '''2X2''' – [[Cathode-ray tube|CRT]] [[High voltage|EHT]] rectifier with a peak inverse voltage of 12.5 kV and peak anode current of 100 mA, 2.5 V/1.75 A heater, UX4 American 4-pin base==={{anchor|OEF}}'''F'''======={{anchor|OEFP}}'''FP'''====[[General Electric]]:*'''FP400''' – Educational, directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, uncoated tungsten filament up to 2600 K (bright emitter); similar to the Ferranti GRD7*'''GE10''' – 500 V, 650 µA Directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, 1.8 V/330 mA<sub>max</sub> uncoated tungsten filament, for use as a heating current-controlled, variable series resistor in voltage/current stabilizer circuits. It has two shorted pins that can be used to disable the circuit if the tube is removed from its socket; cf. 5845, YA1000*'''GRD7''' – Educational, directly heated, [[Thermionic emission|thermally-limited (=''saturated'') emission]] diode, uncoated tungsten filament, guard rings to ensure a homogeneous anode/cathode field; similar to the General Electric FP400#* 5 V originally for a three-cell lead-acid battery with a variable filament resistor ([[#With a 5 Volts DC filament|{{color|Green|examples}}]]); later became a standard for indirectly AC-heated full-wave rectifiers ([[#5 volt heater/filament tubes|{{color|Green|examples}}]])*'''70B1''' – Voltage reference tube, all-glass pigtailed*'''N77''' = '''6AM5/EL91''', '''N78''' = '''6BJ5''' – Power pentodes, Miniature 7-pin base*'''6702''' (200 to 400 MHz), '''6713''' (0.15 to 30 MHz) – [[Trochotron|''Beam-X Switch'']] modified for use as a [[Noise generator|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*'''7323''', '''7400''' (top-viewing), '''7401''', '''7979''' – Small neon-filled cold-cathode thyratrons for use as a latching indicator, all-glass pigtaled; cf. 395A, МТХ-90*'''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-glas pigtails, up to {{cvt|80000|ft|km|lk=on}} altitude; cf. 28D7W*'''8461''' – 80 kV, 200 kW Water-cooled power triode with three 15 V/200 A (each) filaments for [[Three-phase electric power|3-phase]] operation in series regulator, or hard-tube modulator applications, considerable [[X-ray tube#Hazards of X-ray production from vacuum tubes|X-radiation]]*'''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 (electronics)|flip-flop]] status indicator in transistorized computers. All-glass pigtailed, 700 mV/35 mA filament; cf. 6977/DM160*'''YD1352S''' = '''8867''' = Amperex '''DX334''' – 5 MHz, 3 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*'''YH1200''' – 5.8 to 7.5 GHz, 12 W C-band Traveling-wave tube*'''YH1210''' – 220 W Traveling-wave tube for use in UHF TV [[Broadcast relay station|transposers]] between 470 and 860 MHz*'''YL1000''' = '''8463''' – 50 MHz, 12 W RF power pentode, B9A Noval base, 1.1 V/880 mA quickstart heater*'''YL1050''' – 1215 MHz, 1.6 kW Forced-air cooled, coaxial, ceramic/metal UHF power tetrode, 3.8 V/20.5 A heater*'''YL1080''' = '''8348''' – 200 MHz, 5 W Dual VHF power tetrode, Noval base, internally neutralized, 1.6 V/2.5 A quickstart heater*'''YL1070''' = '''8117''' (Center-tapped 12.6/6.3 V heater), '''YL1071''' = '''8116''' (center-tapped 26.5/13.25 V heater) – 60 MHz, 100 W Dual linear RF power tetrode, B7A Septar 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, Noval base, internally neutralized, 1.1 V/2.9 A quickstart heater*'''YL1150''' = '''8579''' – 60 MHz, 75 W Linear RF beam power tetrode, Septar base, center-tapped 12.6/6.3 V heater*'''YL1190''' = '''8580''' – 500 MHz, 8 W Dual UHF power tetrode, B9D Magnoval base, internally neutralized, 1.1 V/4.2 A quickstart heater*'''YL1210''' = '''8457''' – [[#QQE03/12|{{color|Green|QQE03/12}}]] with a center-tapped 12.6/6.3 V heater*'''YL1220''' = '''8577''' – [[#QQE02/5|{{color|Green|QQE02/5}}]] with a center-tapped 13.5/6.75 V heater*'''YL1240''' = '''8458''' – 200 MHz, 10 W Dual VHF power tetrode, B9E Novar base, internally neutralized, center-tapped 13.5/6.75 V heater*'''YL1250''' = '''8505''' – 250 MHz, 30 W VHF beam power tetrode, Magnoval base, center-tapped 13.5/6.75 V heater*'''YL1270''' = '''8581''' – 500 MHz, 18 W Dual UHF power tetrode, B8G Loctal base, internally neutralized, 1.1 V/4 A quickstart heater*'''YL1290''' – [[#QE08/200|{{color|Green|QE08/200}}]] with a 19 V/1.4 A heater*'''YL1310''' = '''8603''' – 75 MHz, 30 W RF beam power tetrode, Magnoval base, 1.2 V/4.2 A quickstart heater*'''YL1360''' – [[#QQE04/5|{{color|Green|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*'''ZT1011''' = '''XR1/1600A''' = '''8063''' – 1 kV, 1.6 kW Inert gas-filled triode thyratron with anode top cap===='''JNT'''====*'''JNT1/500''' – 1.22 to 1.35 GHz, 600 kW Forced-air cooled, external-magnet, mechanically tunable, pulsed L-band [[Cavity magnetron|Magnetron]]*'''JP8/02B''' – 8.8 GHz, 25 W Forced-air cooled, pulsed Magnetron used in airborne X-band [[Pulse-Doppler radar|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*'''JPT9/01''' – JPG9/01 with a different mechanical tuning arrangement:*'''XR1/1600A''' = '''ZT1011''' = '''8063''' – Improved XR1/1600*'''20TC4''', '''30TC1''' – ''Tacitron''; cf. 6441, EC860*'''395A''' – Small neon-filled cold-cathode thyratron for use as a latching single-dot indicator, top-viewing, radioactive keep-alive, all-glass pigtaled; cf. 7323, 7400, 7401, 7979, МТХ-90*'''874''' – 90 V, 10 to 50 mA [[Voltage-regulator tube]], UX4 4-pin base*'''876''' (1.7 A), '''886''' (2.05 A) – 40 to 60 V [[Iron-hydrogen resistor|Barretter]]s, E39 ''Mogul'' [[Edison screw]] lamp basePowered by a [[Vacuum tube battery|storage battery]] ("B+" anode), and one 1.5 volt [[dry cell]] with a [[rheostat]] ("A" filament)Powered by a storage battery (anode), and one 2 volt [[lead–acid battery|lead-acid cell]] (filament)Powered by a storage battery (anode), and two lead-acid cells (filament)Powered by a storage battery (anode), and three lead-acid cells (cheap 6 volt vehicle crank battery) with a rheostat (filament)*'''15''' – Sharp-cutoff pentode, 2 V/220 mA heater, designed for [[Autodyne|Autodyne circuits]] requiring a separate (=indirectly heated) cathode, used in [[Antique radio#Farm radios|farm radios]]*'''48''' – Power tetrode, 30 V/400 mA heater, designed for use on 115-volt DC mains systems, popular in 32-volt farm radios where two parallel or push-pull-connected 48s can deliver a modest audio power with anode and screen voltages as low as 28 volt; cf. 28D7WUsed with a small, wirewound potentiometer across the floating heater supply with its slider tied to signal ground, to cancel out [[mains hum]]*'''10''' – 12 W Power triode, 7.5 V/1.25 A filament; early versions numbered '''UX-210''' or '''CX-310'''*'''26''' – Medium-mu triode, 1.5 V/1.05 A filament, used in early AC radio receivers manufactured in the late 1920s as an RF or AF amplifier, but not as a detector or power output tube; early versions numbered '''UX-226''' or '''CX-326'''*'''45''' – 2 W Power triode, 2.5 V/1.5 A filament; early versions numbered '''UX-245''' or '''CX-345'''*'''46''' – 1.25 W Dual-grid power triode, 2.5 V/1.75 A filament - Grids 1 and 2 connected together for use as push-pull [[Power amplifier classes#Class B|Class-B]] outputs, or Grid 2 tied to anode for use as single-tube Class-A audio driver (technically a tetrode)*'''47''' – 2.7 W Power pentode, 2.5 V/1.75 A filament; early versions numbered '''RCA-247''' or '''C-347'''*'''50''' – 4.6 W Power triode, 7.5 V/1.25 A filament, V/ mA filament; early versions numbered '''UX-250''' or '''CX-350'''*'''71-A''' – 790 mW Power triode, 5 V/250 mA filament – this number listed in tube manuals after 1930 for replacements purposes; also referred to as '''171-A'''. Many early versions numbered as '''UX-171-A''' or '''CX-371-A'''#* However, most [[Valve RF amplifier|RF power tubes]] are directly heated, so for the abovementioned reason, the heater voltage must be much smaller than the signal voltage on the 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 [[Three-phase electric power|3-phase]] heater to reduce [[Mains hum|hum]].:*'''6K''' – 6-cavity Klystron:*'''7K''' – 7-cavity Klystron:*'''P''' – [[Airband#Other bands|225 to 390 MHz]]:*'''L''' – 390 to 1550 MHz:*'''S''' – 1.55 to 3.9 GHz:*'''C''' – 3.9 to 6.2 GHz:*'''X''' – 6.2 to 10.9 GHz:*'''K''' – [[K band (IEEE)|10.9 to 36 GHz]]:*'''Q''' – [[Q band|36 to 46 GHz]]:*'''V''' – [[V band|46 to 56 GHz]]*'''3-200A3 = 592''' – 150 MHz, 200 W Glass power triode with anode top cap*'''3-400Z/8163''' – 110 MHz, 400 W Glass power triode with anode top cap*'''3-1000Z/8164''' – 110 MHz, 1 kW Glass power triode with anode top cap*'''3CPN10A5/7815''' (contact-cooled), '''3CPX100A5/7815R''' (forced-air-cooled) – 3 GHz, 10 W<sub>avg</sub>, 2 kW<sub>peak</sub> Ceramic UHF pulse power triode*'''3CW5000A1/8240''', '''3CW5000F1/8241''' (with flexible leads for grid and filament) – 5 kW Ceramic/metal power triode, water-cooled*'''3CW50000C/8350''' – 30 MHz, 50 kW Ceramic/metal power triode, water-cooled*'''3CX1000A7/8283''' – 220 MHz, 1 kW Ceramic/metal power triode*'''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*'''4-400C/6775''' – 110 MHz, 400 W Glass radial-beam power tetrode*'''4CPX250K/8590''' – 500 MHz, 250 W<sub>avg</sub>, 17.5 kW<sub>peak</sub> 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*'''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''' (6.0 V heater), '''4CX350F/8322''' (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*'''4CM300000G''' – 50 MHz, 300 kW Ceramic tetrode, water/vapor cooled, for use in broadcast transmitters*'''5K50CB''' – [[Ethylene glycol#Coolant and heat-transfer agent|Ethylene glycol]]-cooled, 4.4 to 5.0 GHz, 10 kW electromagnet-focused linear-beam, 5-cavity Klystron for use in C-band [[Tropospheric scatter|troposcatter systems]]*'''5K70SH''' – Forced-air and water-cooled, [[ISM radio band|2450 MHz]], 30 kW, electromagnet-focused linear-beam, 5-cavity Klystron for use in [[Dielectric heating|industrial heating applications]]*'''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 kW<sub>avg</sub>, 3 MW<sub>peak</sub>, 7-cavity pulsed Klystron<ref>{{cite web |url=https://frank.pocnet.net/other/Eimac/Eimac_ShortformCatalogue_1964.pdf |title=Eimac Shortform Catalogue |publisher=[[Eimac|Eitel McCullough]] |year=1964 |access-date=7 December 2020}}</ref>{{rp|9}}Eimac also maintained an internal prototype numbering system consisting of the letter X followed by 3 or 4 digits, such as "X-2159".Then a delimiter:* '''/''' (slash) – Philips device (used throughout this list)* '''-''' (dash) – Mullard device{{anchor|MOMP}}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, MEBC3, MEF5, MEF6, MEF9, MKBC1, MUBC41, MUCH42, MUF9, MUF41, MUL41, MUM4, MUY41====One-volt [[Electrical ballast#Self-variable resistors|ballast tubes]]====Used to adapt the above 2 volt DC filament tubes to 2-cell dry batteries*'''1A1''' – 490 mA filament*'''1C1''' – 745 mA filament*'''1D1''' – 240 mA filament*'''1F1''' – 720 mA filament*'''1D2''', '''1G1''' – 420 mA filament*'''1E2''', '''1S1''', '''1W1''' – 660 mA filament*'''1J1''' – 620 mA filament*'''1K1''' – 550 mA filament*'''1R1''', '''1Y1''' – 540 mA filament*'''1T1''', '''1V1''' – 560 mA filament*'''1U1''' – 740 mA filament*'''1Z1''' – 900 mA filament*'''40B2''' – 20 to 60 V [[Iron-hydrogen resistor|Barretter]], Octal base, to stabilize against mains voltage fluctuations*'''50A2''' (with tap for 2 pilot lights), '''50B2''' (with tap for 1 pilot light) – 50 V Barretter, 4-pin base, to stabilize against mains voltage fluctuations*'''40A1''', '''50A1''' – [[Iron-hydrogen resistor|Barretters]] for use as [[Cathode bias|cathode resistors]] of horizontal-deflection output tubes in early TV receivers to stabilize the picture width against mains voltage fluctuations*'''[[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*'''EC560''' (2C40) – ''Lighthouse''-type ''disk-seal'' microwave triode*'''EC562''' (2C39B) – ''Lighthouse''-type ''disk-seal'' microwave triode'''Note:''' [[#MOMP|{{color|Green|Marconi}}]] preceded the M-P designation with the letter '''M''', as in MEBC3 for EBC3*'''PL841''' – AF or CRT vertical deflection output power pentode*'''YH1000''' – 1.7 to 2.3 GHz, 16 W [[Traveling-wave tube]] for use in L-band [[Microwave transmission#Microwave radio relay|point-to-point radio links]]*'''YH1050''' – 4.4 to 5.0 GHz, 2 W Traveling-wave tube for use in C-band point-to-point radio links*'''YH1110''' – 5.8 to 8.5 GHz, 15 W Traveling-wave tube for use in C-band point-to-point radio links*'''YH1120''' – 5.8 to 8.5 GHz, 10 W Traveling-wave tube for use in C-band point-to-point radio links*'''YH1131''' – 11.7 to 12.7 GHz, 10 W K<sub>u</sub>-band Traveling-wave tube*'''YH1150''' – 1.7 to 2.3 GHz, 1 kW Traveling-wave tube for use in L-band satellite ground stations/radar/[[Tropospheric scatter|troposcatter]]*'''YH1160''' – 3.6 to 4.2 GHz, 14 W C-band Traveling-wave tube*'''YH1181''' – 4.4 to 5.0 GHz, 1 kW Traveling-wave tube for use in C-band satellite ground stations/radar/troposcatter*'''YH1190''' – 11.7 to 12.7 GHz, 70 W Traveling-wave tube for use in K<sub>u</sub>-band satellite ground stations/radar/troposcatter*'''YK1010''' – 67 to 74 GHz, 130 mW V-band [[Sutton tube|Reflex Klystron]]*'''YK107x''' – 5.9 to 8.1 GHz, 1.2 W C-band Reflex Klystrons, contact-cooled variants of the YK114x*'''YK1090''' (flying leads), '''YK1091''' (B3A 3-pin base) – 10.5 to 12.2 GHz, 400 mW X-band Reflex Klystrons*'''YK1110''' – Water-cooled 6 MW<sub>peak</sub>, 2998±5 MHz, electromagnet-focused linear-beam, 3-cavity pulsed Klystron for use in [[linear particle accelerator]]s*'''YK114x''' (KS6/1000x, KS7/1000x) – 5.9 to 8.1 GHz, 1.2 W C-band Reflex Klystrons, forced-air cooled variants of the YK107x*'''YK1200''' – Water-cooled 25 MW<sub>peak</sub>, 2998±5 MHz, electromagnet-focused linear-beam, 5-cavity pulsed Klystron for use in linear particle accelerators*'''YK1223''' – YK1220 with a modulating anode*'''YK1233''' – YK1230 with a modulating anode*'''KS6/1000x''', '''KS7/1000x''' (YK114x) – 5.9 to 8.1 GHz, 1.2 W Reflex Klystrons*'''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*'''LA4/250''' = '''7637''' – 3.6 to 4.2 GHz, 200 mW ''[[Traveling-wave tube|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''*'''RG4/1250''' = EnglishElectricValve '''AH221''' = M-O '''GU21''' – Half-wave mercury-vapor rectifier, E40 ''Goliath'' [[Edison screw]] lamp base===='''RR'''====*'''RR3/1250''' – 3.1 kV, 1.25 A Half-wave inert-gas filled rectifier with anode top cap===='''RY'''====*'''RY12/100''' – 12.5 kV, 100 mA Half-wave vacuum rectifier with anode top cap*'''TAW12/35G''' – 12 kV, 35 kW Water-cooled power triode, 3-phase filaments*'''TBL15/125''' – 15 kV, 125 kW Forced-air cooled power triode; TBL12/100 with 3-phase filaments*'''TBW15/125''' – 15 kV, 125 kW Water-cooled power triode; TBW12/100 with 3-phase filaments*'''893''' – 20 kW Water-cooled power triode with 3 independent 10 V/61 A (each) filaments for [[Three-phase electric power|3-phase]] operation in broadcast/industrial applications*'''898''' – 50 kW Water-cooled power triode for broadcast/industrial applications; improved variant of 862 with 3 independent 33 V/70 A (each) filaments for 3-phase operation*'''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*An initial digit denoting the number of electrodes, or [[Microwave cavity|cavitiy resonators]] when followed by the letter K::*'''1K''' – [[Sutton tube|Reflex Klystron]]:*'''2K''' – 2-cavity [[Klystron]]:*'''3K''' – 3-cavity Klystron:*'''4K''' – 4-cavity Klystron:*'''5K''' – 5-cavity Klystron*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 [[Power amplifier classes#Class C|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:*'''M''' – ''Multiphase''-cooled (water/vapor), or has a modulating anode (Klystrons only):—Klystrons/Klystrodes only::*'''CA''', '''CH''' – [[C band (IEEE)|C band]], coaxial output:*'''CB''', '''CG''', '''CK''', '''CL''', '''CS''' – C band, [[waveguide]] output:*'''LA''' – [[Band IV|UHF low]] (analog TV broadcast <600 MHz):*'''LF''', '''LK''', '''LQ''', '''LR''' – [[Band V|UHF high]] (analog TV broadcast >600 MHz):*'''LT''', '''LX''' – [[L band]]:*'''SH''', '''SI''', '''SJ''' – [[S band]]:*'''XA''' – [[X band]], coaxial output:*'''XD''', '''XF''', '''XG''', '''XK''', '''XN''', '''XS''' – X band, waveguide output*'''5KM300SI''' – Forced-air and water-cooled, 2.1 to 2.4 GHz, 100 kW, electromagnet linear-beam 5-cavity Klystron for use in ''[[Unified S-band]]'' ground transmitters of [[History of the Deep Space Network|spacecraft communications systems]]*'''GT1''' – Mercury vapor-filled, 1 kV, 300 mA<sub>avg</sub>, 500 mA<sub>RMS</sub>, 1 A<sub>peak</sub> thyratron, 4 V/1.3 A heater, O5A European 5-pin base:*'''GT1A''' – Argon-filled, 300 V, 200 mA<sub>avg</sub>, 300 mA<sub>RMS</sub>, 600 mA<sub>peak</sub> version of GT1:*'''GT1C''' = '''AN1''' – Argon-filled, 500 V, 300 mA<sub>avg</sub>, 500 mA<sub>RMS</sub>, 1 A<sub>peak</sub> version extensively used in the [[Colossus computer]]*'''MKT4''' – 3.2 W Beam power tetrode, 4 V/1 A heater, British 5 or 7-pin base*'''MU12''' = EdiSwan '''UU4''' (350 V), '''MU14''' = '''UU5''' = Mullard '''IW4-500''' (500 V) – Indirectly heated full-wave rectifier, 4 V/2.5 A heater, British 4-pin base*'''6L31''' = 6AQ5/EL90 – Power pentode, 6.3 V/450 mA heater, Miniature 7-pin base*'''7462''' – Miniature all-ceramic disk-seal UHF triode; PCB variant of 7077*'''AN1''' = M-OV '''GT1C''' – -1300 to +650 V<sub>a</sub>, 300 mA<sub>avg</sub>, 2 A<sub>peak</sub>, 15 A<sub>surge</sub>, Gas-filled triode thyratron with negative control characteristic, 4 V/1.45 A heater, O5A European 5-pin base, for industrial control applicationsThe Chinese 广州曙光无线电厂 ([[Guangzhou]] {{Visible anchor|Shuguang}} Radio Factory) did the reverse, adapting the GOST system (below) to Latin letters for some of their tubes.;<ref>[https://frank.pocnet.net/sheets/095/suppinfo/095.pdf Shuguang 1973 Tube Manual] (in Chinese);</ref>*'''5T8''' – [[Control grid#Effects of grid position|High-mu]] triode + triple diode (two on common cathode with triode, one with independent cathode), Noval base, used as an AF amplifier, AM detector and FM ratio detector in series-heated post-war AM/FM radios; [[#6T8|{{color|Green|6T8}}]], [[#6AK8|{{color|Green|6AK8}}]]/[[#EABC80|{{color|Green|EABC80}}]], 9AK8/PABC80, 19T8/HABC80 or 27AK8/UABC80 with a different heater===='''AAB'''====*'''AAB1''' – Triple diode with common cathode, side-contact 8 base; EAB1 or PAB1 with a different heater===='''ABF'''====*'''ABF1''' – Common cathode dual diode + remote-cutoff RF/IF/AF pentode, side-contact 8 base with control grid on top cap*'''AC102''' – Triode, P7A German PTT 7-pin base with 2 unused pins*[[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'''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===='''PAB'''====*'''PAB1''' – Triple diode with common cathode, side-contact 8 base; AAB1 or EAB1 with a different heater*'''PCE800''' = EdiSwan '''30FL1''' – Triode + low-power semiremote-cutoff beam tetrode, Noval base*[[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*'''6А2П''' ⟼ '''6A2P''' = '''6BE6/EK90''' = Shuguang '''6A2''' – Heptode [[pentagrid converter]]*'''6А7П''' ⟼ '''6A7P''' = '''6SA7''' = Shuguang '''6A7P''' – Heptode pentagrid converter*'''6Б8С''' ⟼ '''6B8S''' = (6B8, EBF32, Shuguang 6B8P) – Dual diode + remote-cutoff pentode*'''6Ж1П''' ⟼ '''6J1P''' = '''[[6AK5]]/EF95''' = Shuguang '''6J1''' – Sharp-cutoff pentode*'''6Ж4П''' ⟼ '''6J4P''' = '''6AU6/EF94''' = Shuguang '''6J4''' – Sharp-cutoff pentode*'''6Ж23П''' ⟼ '''6J23P''' (6BK8/6CF8/EF86) – Sharp-cutoff pentode*'''6П27C''' ⟼ '''6P27S''' ([[6CA7]]/EL34) – AF power pentode;{{Visible anchor|Designation systems}}:;{{Visible anchor|Drawings}}:*RCA: [http://www.tubebooks.org/tubedata/hb-3/General/Outlines-Glass_Tubes.pdf Glass] • [http://www.tubebooks.org/tubedata/hb-3/General/Outlines-Metal_Tubes.pdf Metal] • [http://www.tubebooks.org/tubedata/hb-3/General/Bases_Top_Caps-7_Pins.pdf Top caps, 3~7-Pin] • [http://www.tubebooks.org/tubedata/hb-3/General/Bases_8-9%20Pins.pdf 8/9-Pin] • [http://www.tubebooks.org/tubedata/HB-3/General/Bases_10_Pins.pdf 10+ Pin]*KyteLabs: [https://www.qsl.net/dl7avf/roehren/sockel1.html list] • [https://www.qsl.net/dl7avf/roehren/bilder.html drawings]<!-- Also http://www.dl7avf.info/charts/roehren/sockel1.html and http://www.dl7avf.info/charts/roehren/bilder.html -->*[http://www.tubedata.org/bases.html Frank Philipse's]*[https://www.qsl.net/dl7avf/roehren/ KyteLabs InfoBase]:*'''PE''' – Trigger pentode, two starter electrodes and a keep-alive (primer) electrode for ion availability:*'''A''' to '''F''' – British 4-pin, K8A Octal, B12A Duodecal [[Phenol formaldehyde resin|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 tubes with wire ends*An optional suffix::*'''/M''' – Trochotron with magnetic shielding:*'''R''' – Shock/vibration-resistant:*'''/S''' – Tested to military specs*'''FC13''' – FC4 with a '''13''' V/200 mA heater and a side-contact 8 base:*'''FC13C''' – FC13 with a British 7-pin base*'''6AN7/ECH80''' – Remote-cutoff [[Pentagrid converter#Hexode|triode/hexode mixer]]; 6CU7/ECH42 with a Noval base*'''6386''' – Dual variable-mu triode for use as VHF cascode amplifiers or in [[Dynamic range compression|audio compressors]]*'''8428''' (2.4 kilowatts), '''8455''' (4 kilowatts) – High pulse power, grid-controlled [[Secondary emission#Special amplifying tubes|electron multiplier]] tubes with a flanged metal envelope and an SO-239 [[UHF connector|UHF output connector]]*'''ECH42/6CU7''' – Remote-cutoff triode/hexode mixer; ECH80/6AN7 with a Rimlock base; UCH42 with a different heater*'''ECH80/6AN7''' – Remote-cutoff triode/hexode mixer;;<ref name="RöTaTa1974" /> ECH42/6CU7 with a Noval base*'''EL21''' – Power pentode, B8G Loctal base;<ref>[https://www.radiomuseum.org/tubes/tube_el21.html EL21 on radiomuseum.org]</ref> related to UL21/UL71; not related to EL71/5902*'''PL302''' – CRT horizontal deflection beam power pentode, Octal base*'''H11''', '''H12''' – Directly heated miniature AF triodes, 2 V/60 mA filament, for use in [[hearing aid]]s; cf. KC50, KC51, Mullard DA1*'''L11''', '''L12''' – Directly heated, miniature AF power triodes, 2 V/60 mA filament, for use in hearing aids; cf. KD50, Mullard DA2, DA3*'''S12''' – Directly heated miniature AF tetrode, 2 V/60 mA filament, for use in hearing aids; cf. KE50, Mullard DAS1*'''DA1''' (2 V/50 mA filament), '''DB1''' (1.5 V/70 mA filament) – Directly heated miniature AF triodes for use in [[hearing aid|'''D'''eaf '''A'''ids]]; cf. DC51, KC50, KC51, Marconi-Osram 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, Marconi-Osram L11, L12*'''DAS1''' (2 V/60 mA filament), '''DBS1''' (1.5 V/70 mA filament) – Directly heated miniature AF tetrode for use in hearing aids; cf. DF51, KE50, Marconi-Osram S12*'''GRS251''' – Radiation-cooled 25 kV/300 mA rectifier*'''DC51''' – Directly heated miniature AF triode, 1.5 V/70 mA filament, for use in [[hearing aid]]s;<ref>[https://www.radiomuseum.org/tubes/tube_dc51.html DC51 on radiomuseum.org]</ref> cf. KC50, KC51, Mullard DB1*'''DD51''' – Directly heated miniature AF power triode, 1.5 V/70 mA filament, for use in hearing aids; cf. KD50, Mullard DB3*'''DF51''' – Miniature, 1.5 V/70 mA half-indirectly heated, sharp-cutoff RF/IF pentode;<ref>[https://frank.pocnet.net/short/054/1/145.pdf DF51 vademecum data]</ref> cf. KE50*'''DL51''' – Miniature, 1.5 V/130 mA half-indirectly heated power pentode*'''EC360''' (Center-tapped heater), '''EC362''' (anode on top cap) – Triodes, Octal base, for use in power supplies:*'''EF12K''' – Low-microphonics version of the EF12*'''KC50''' – Triode for use in [[hearing aid]]s, 4-pin base;<ref>[https://www.radiomuseum.org/tubes/tube_kc50.html KC50 on radiomuseum.org]</ref> cf. Marconi-Osram H11, H12, Mullard DA1*'''KC51''' – Triode, 4-pin base;<ref>[https://www.radiomuseum.org/tubes/tube_kc51.html KC51 on radiomuseum.org]</ref> cf. DC51===='''KD'''====*'''KD50''' – Power triode for use in hearing aids, 4-pin base;<ref>[https://www.radiomuseum.org/tubes/tube_kd50.html KD50 on radiomuseum.org]</ref> cf. DD51, Marconi-Osram L11, L12, Mullard DA2, DA3===='''KE'''====*'''KE50''' – Tetrode for use in hearing aids, 4-pin base with anode on top cap;<ref>[https://www.radiomuseum.org/tubes/tube_ke50.html KE50 on radiomuseum.org]</ref> cf. DF51, Marconi-Osram S12, Mullard DAS1==='''Q''' - 2.4 V heater======='''QC'''====*'''QC100''' – Low-microphonics triode<ref>[https://www.radiomuseum.org/tubes/tube_qc100.html QC100 on radiomuseum.org]</ref>===='''QZ'''====*'''QZ100''' – Full-wave rectifier<ref>[https://www.radiomuseum.org/tubes/tube_qz100.html QZ100 on radiomuseum.org]</ref>Further types such as the QD100, QF100,<ref>[https://www.radiomuseum.org/tubes/tube_qf100.html QF100 on radiomuseum.org]</ref> QH100, QLL100, QY100 were under development, but didn't get past the prototyping phase<ref>{{cite web |url=http://www.hts-homepage.de/Wehrmacht/Gemeinschaft/WMGemein.html |title=Behördenröhren (Government tubes) |language=de |access-date=19 July 2020}}</ref>*'''Z71U''' = '''7711''' – Subminiature, 7 mA<sub>avg</sub>, 12 mA<sub>peak</sub>, Gas-filled, cold-cathode DC trigger tetrode, two starters, positive starter voltage, 4-pin all-glass pigtailed, low impedance at audio frequencies for use in a [[Crossbar switch|telephone exchange]]This part dates back to the joint valve code key ({{lang-de|[[Wiktionary:Röhre|Röhren]]-[[Wiktionary:Gemeinschaft|Gemeinschaft]]s[[Wiktionary:Schlüssel|schlüssel]]}}) negotiated between Philips and Telefunken in 1933–34. Like the North American system the first symbol describes the heater voltage, in this case a Roman letter rather than a number. Further Roman 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.<ref name="PhilipsMiniwatt1962">{{cite web |url=http://www.radiomanual.info/schemi/Surplus_Handbooks/Miniwatt_technical_data_7th_Philips_1962.pdf |title=Miniwatt Technical Data |edition=7 |publisher="Miniwatt" Electronics Division of Philips Electrical Industries Pty. Limited, 20 Herbert Street, Artarmon, N,S,W., Australia |year=1962 |access-date=27 June 2020}}</ref>The first (1888) incarnation of ''[[La Compagnie des Lampes]]'' produced the [[#O1915|{{color|Green|'''TM''' tube}}]] since 1915 and defined one of the first French systems;<ref name="DecoderLinks" /><ref>{{cite web |url=http://paillard.claude.free.fr/lampes1.pdf |title=Les lampes |language=fr |access-date=1 May 2017}}</ref> not to be confused with Compagnie des Lampes (1921, "French Mazda", see [[#FrenchMazda|{{color|Green|below}}]]). This system was also used by the British {{H:title|The Electrical Trading Assoc., Ltd, Aldwych House, Aldwych, London|ETA}}<ref>[http://www.r-type.org/ephemera/ephe008.htm ''Electrical Trading Association''] on r-type.org</ref>— [[Thyratron]]s:*'''2A4''' – Directly heated triode thyratron, 2.5 V/2.5 A heater, 7-pin base*'''2B4''' = '''885''' – Indirectly heated triode thyratron used in [[DuMont Laboratories|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 baseThese 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*'''3B5GT''' – AF beam power pentode, Octal base*'''3B7''' – 1.4 W Dual VHF power triode up to 125 MHz, Loctal base*'''3E5''' – 200 mW AF beam power pentode, Miniature 7-pin base*'''3LF4''' – 330 mW AF beam power pentode, Loctal base;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 filament, so it can also be wired for 2.5 V'''Note:''' 6-prefix tubes with center-tapped heaters are listed under ''[[#300 mA series heater tubes|{{color|Green|300 mA series heater tubes}}]]''*'''6AU7''' – AF, Medium-[[Control grid#Grid variations|mu]] dual triode; 12AU7/ECC82 with a different, but also center-tapped heater that can be wired for 300 mA/6.3 V or 600 mA/3.15 V*'''6AX7''' – AF, High-mu dual triode; 12AX7/ECC83 with a different, but also center-tapped heater that can be wired for 300 mA/6.3 V or 600 mA/3.15 V*'''6CN7''' – Dual common cathode diode + triode for use az horizontal phase detector and reactance tube in TV receivers; 8CN7 with a different, but also center-tapped heater that can be wired for 300 mA/6.3 V or 600 mA/3.15 V*'''6FA7''' – Diode + sharp-cutoff dual-anode tetrode for use as frequency divider or complex-wave generator, 6.3 V/300 mA heater, Noval base*'''6FS5''', '''6GU5''' – Sharp-cutoff, ''Shadow-Grid'' beam pentode with a beam-forming extra grid between control and screen grids, intended to reduce screen current and hence anode/screen grid distribution [[Noise (electronics)|noise]] (technically a hexode), Miniature 7-pin base; cf. DAH50, EF8, EF38*'''7AU7/XCC82''' – 6AU7 Dual triode iwith a 300 mA/7.0 V resp. 600 mA/3.5 V heater*'''8CN7''' – Dual common cathode diode + triode for use as horizontal phase detector and reactance tube in TV receivers; 6CN7 with a different, but also center-tapped heater that can be wired for 225 mA/8.4 V or 450 mA/4.2 V====For fixed/mobile equipment====Many of these tubes have a 150 mA heater and so were popular in [[All American Five|AA5 radio receivers]]; some have 300, 450 or 600 mA heaters for use in TV receivers— '''with a center-tapped heater''', used in:{{ordered list|type=lower-roman|Dual-system (6V and 12V) [[Vehicle audio|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, UX7 base, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater. Mostly used in pre-war car radios*'''12AD7''' – Dual high-mu triode, center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater, Noval base*'''[[12AT7]]/ECC81''', 6060, B309, M8162 – High-[[Control grid#Grid variations|mu]] dual 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<ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" /> [[File:Commons-logo.svg|16x16px|link=:Commons:Category:12AT7/ECC81|class=noviewer|alt=]]*'''[[12AU7]]/ECC82''', 6067, B329, M8136 – Medium-mu dual triode with a center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater.<ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" /> Two 6C4/EC90s in one envelope;<ref name="Brimar12AU7">{{cite web |url=https://frank.pocnet.net/sheets/184/1/12AU7.pdf |publisher=[[Standard Telephones and Cables|STC]] |title= 12AU7 data sheet |date=August 1950 |access-date=1 May 2017}}</ref> however, it is only specified as an audio frequency device. Commonly used in audio applications and TV receivers [[File:Commons-logo.svg|16x16px|link=:Commons:Category:12AU7/ECC82|class=noviewer|alt=]]*'''12AV7''', 5965 – Medium-mu dual triode with a center-tapped 12.6 V/225 mA resp. 6.3 V/450 mA heater. Principally designed for VHF amplifier/mixer operation.<ref>https://frank.pocnet.net/sheets/127/1/12AV7.pdf</ref>*'''[[12AX7]]/ECC83''', 6057, B327, M8137 – High-mu dual 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<ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" /> [[File:Commons-logo.svg|16x16px|link=:Commons:Category:12AX7/ECC83|class=noviewer|alt=]]*'''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<ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" />*'''12AZ7''' – Medium-mu dual 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<ref>https://frank.pocnet.net/sheets/127/1/12AZ7.pdf</ref><ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" />*'''12B4A''' – Low-mu triode with a center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base<ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" />*'''12BH7''' – Medium-mu dual triode with a center-tapped heater 12.6 V/300 mA resp. 6.3 V/600 mA heater<ref>https://frank.pocnet.net/sheets/049/1/12BH7A.pdf</ref><ref name="RCA_12AB5_12AE10_12AT7/ECC81_12AU7A/ECC82_12AX7A/ECC83_12AY7_12AZ7A_12B4A_12BH7A" />*[[12BV7|'''12BV7''', '''12BY7/EL180''', '''12DQ7''']] – [[Cathode-ray tube|CRT]] cathode drive power pentodes with a center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater<ref>[https://frank.pocnet.net/sheets/191/1/12BY7A.pdf 12BV7, 12BY7/EL180, 12DQ7 data sheet]</ref>*'''12BZ7''' – Dual high-mu triode for use as sync separator and amplifier, center-tapped 12.6 V/300 mA resp. 6.3 V/600 mA heater, Noval base*'''12DF5''' – Separate cathodes dual rectifier, center-tapped 12.6 V/450 mA resp. 6.3 V/900 mA heater, Noval base*'''12DF7''' – Dual triode, low-microphonics version of 12AX7, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base*'''12DM7''' – Dual high-mu 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-mu AF triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 mA heater, Noval base*'''12DW7/ECC832''', '''7247''' – Dual dissimilar audio 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*'''12U7''' – Dual medium-mu triode, center-tapped 12.6 V/150 mA resp. 6.3 V/300 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*'''12AE7''' – Low (12.6-16 V) anode voltage dissimilar (medium-mu and low-mu) 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-mu triode + power tetrode with a [[Tetrode#Space charge grid tube|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 + low (12.6-16 V) anode voltage, dissimilar dual triode, 12.6 V/450 mA heater, Noval base*'''12DY8''' – Low (12.6-16 V) anode voltage medium-mu 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-mu triode + semiremote-cutoff pentode, 12.6 V/225 mA heater, Noval base*'''12EG6''' – Low (12.6-30 V) anode voltage heptode pentagrid converter, both 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-mu 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-mu 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. 13П1П, 13П1С*'''12SW7''' – Dual diode + low (26.5-250 V) anode voltage triode, 12.6 V/150 mA heater, Octal base*'''12SX7GT''' – Low (26.5-300 V) anode voltage dual 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 baseThese 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 [[Phonograph#Piezoelectric (crystal/ceramic) cartridges|phonographs]] and ''Three-way portable'' (AC or DC mains, or batteries) radio receivers*'''20EZ7''' – Dual high-mu AF triode, center-tapped 20 V/100 mA resp. 10 V/200 mA heater, Noval base*'''KY50/2L2''' = '''U25''' (EdiSwan) – [[Cathode-ray tube|CRT]] [[High voltage|EHT]] rectifier, all-glass pigtailed*'''KT2''' – 1 W Beam tetrode, British 5-pin base, 2 V/200 mA filament*'''KT21''' – 1.25 W Beam tetrode, British 5-pin base, 2 V/300 mA filament*'''KT32''' (25L6, 25L6G, 25L6GT, 25W6GT) – 7.5 W Beam tetrode, Octal base, 26 V/300 mA heater for use in AC/DC radio receivers with series heater strings*'''KT33''' (25A6GT) – 5 W Beam 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 tetrode, Octal base, 26 V/300 mA heater for use in AC/DC radio receivers with series heater strings*'''KT41''' – 8.6 W Beam tetrode, British 7-pin base, 4 V/2 A heater*'''KT55''' – 25 W Beam 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 tetrode, Octal base, 6.3 V/950 mA heater*'''KT63''' (6F6, 6F6G, 6F6GT) – 6 W Beam tetrode, Octal base, 6.3 V/700 mA heater*'''[[KT66]]''' ([[6L6|6L6GC]]) – 7.25 W Beam tetrode, Octal base, 6.3 V/1.27 A heater [[File:Commons-logo.svg|16x16px|link=:Commons:Category:KT66|class=noviewer|alt=]]*'''KT67''' – 25 W RF beam tetrode, B9G 9-pin Loctal base, 6.3 V/1.5 A heater*'''KT71''' (50L6GT)– 5 W Beam tetrode, Octal base, 48 V/160 mA heater for use in AC/DC radio receivers with series heater strings*'''KT77''' ([[EL34|6CA7/EL34]]) – 30 W Beam tetrode, Octal base, 6.3 V/1.4 A heater*'''KT81''' – KT61 with a Loctal base*'''[[KT88]]''' = '''6550A''' = '''CV5220''' (12E13, 7D11) – AF beam power tube, two tubes are capable of providing 100 W output, [[Amplifier#Class AB|Class-AB<sub>1</sub>]], Octal base, 6.3 V/1.6 A heater [[File:Commons-logo.svg|16x16px|link=:Commons:Category:KT88|class=noviewer|alt=]]*'''KTZ41''' – Sharp-cutoff RF/IF beam tetrode, British 7-pin base with control grid on top cap, 4 V/1.5 A heater*'''EBC80/6BD7''' – Shielded dual diode + triode, Noval base*'''EBF81/6AD8''' – Common cathode dual diode + remote-cutoff pentode, Noval base*'''EF81/6BH5''' – Remote-cutoff RF/IF/Video pentode, Noval base*'''EF190/6CB6''' – Remote-cutoff RF pentode for use in video IF circuits*'''EY189/6AL3''' – Half-wave rectifier, Noval basepl:Cokół (lampy) tube base gallery, added a tube envelope gallery, specified bases*'''4-65A''' (''8165'') – 65 W Glass [[beam tetrode]], 5-pin ''Septar'' base with anode top cap:*'''10–19''' – Y8A ''steel tube''::*'''60–64''' – B9G 9-pin Loctal:*'''500–529''' – B9D Magnoval or B9E Novar; Pro Electron-issued:*'''ГД''' ⟼ '''GD''' – [[Longwave]] tube ({{lang-ru|[[Wiktionary:длинный|'''Д'''линный]] |links=no}}) "Long"):*'''ГК''' ⟼ '''GK''' – [[Shortwave radio|Shortwave]] tube (≤30 MHz; {{lang-ru|[[Wiktionary:короткий|'''К'''ороткий]] |links=no}}) "Short"):*'''ГУ''' ⟼ '''GU''' – VHF tube (≤300 MHz; {{lang-ru|[[Wiktionary:ультра-|'''У'''льтра]]коро́ткий |links=no}}) "Ultra-short" [wave tube]):*'''ГС''' ⟼ '''GS''' – [[Microwave]] tube (>300 MHz; {{lang-ru|[[Wiktionary:сверх-|'''С'''верх]][[Wiktionary:высоко|высоко]][[Wiktionary:частотный|частотный]] |links=no}}):*'''ГП''' ⟼ '''GP''' – Power tube for use in shunt or series-pass voltage regulators:*'''ГР''' ⟼ '''GR''' – [[Mercury-arc valve|Mercury-vapor rectifier]] ({{lang-ru|[[Wiktionary:ртуть|'''Р'''туть]] |links=no}}) "Mercury"):*'''ГШ''', '''ГШП''' ⟼ '''GSha''', '''GShaP''' – [[Noise generator|Noise diode]] ({{lang-ru|[[Wiktionary:шум|'''Ш'''ум]] |links=no}}) "Noise"):*'''ЛИ''' ⟼ '''LI''' – [[Video camera tube]] or [[monoscope]] ({{lang-ru|[[Wiktionary:изобразить|'''И'''зобразить]] |links=no}}) "to picture"):*'''ЛК''' ⟼ '''LK''' – CRT for TV with magnetic deflection ({{lang-ru|'''К'''инеско́п |links=no}}), meaning "[[:ru:Кинескоп|picture tube]]", not "[[Kinescope]]"):*'''ЛН''' ⟼ '''LN''' – [[Storage tube]] ({{lang-ru|[[Wiktionary:накопить|'''Н'''акопить]] |links=no}}) "to stockpile"):*'''ЛНС''' ⟼ '''LNS''' – [[Charactron|Typotron]] ({{lang-ru|[[Wiktionary:символ|'''С'''имвол]]; Знакопечатающая запоминающая трубка |links=no}}) "Symbol/Character/Glyph"; "Typographic memory tube"):*'''ЛП''' ⟼ '''LP''' – [[Trochotron]] ({{lang-ru|электронно-лучевой [[Wiktionary:переключатель|'''п'''ереключатель]] |links=no}}) "Electron beam switch"):*'''ТХ''', '''ТХИ''', '''МТХ''' ⟼ '''TH''', '''THI''', '''MTH''' – Gas-filled, cold-cathode thyratron ({{lang-ru|[[Wiktionary:холодный|'''Х'''олодный]]|links=no}} "Cold")*'''1U6''' – 1L6 with a 1.4 V/25 mA filament*'''2E5''' – Top-view, "Magic Eye"-type [[Magic eye tube|tuning indicator]]; '''2G5''' with with a sharp-cutoff driver triode; '''6E5''' with a different heater*'''2G5''' – Top-view, "Magic Eye"-type tuning indicator; '''2E5''' with with a remote-cutoff driver triode; '''6G5/6U5''' with a different heater*'''6A6''' – Dual Power Triode, used as a [[Amplifier#Class A|Class-A]] audio driver or a [[Amplifier#Class B|Class-B]] audio output. ''Septar'' base. 6.3 volt heater version of type '''53''' which had a 2.5 volt heater. Octal version – '''6N7'''*'''6AB5/6N5''' – Top-view, "Magic Eye"-type [[Magic eye tube|tuning indicator]] with with a sharp-cutoff driver triode*'''6AD6-G''' and '''6AF6-G''' – Top-view, driverless "Magic Eye"-type tuning indicators...*'''6AL7-GT''' – Top-view, driverless, triple (independently controllable) bar graph-type tuning/level indicator used in many early AM/FM Hi-Fi radios*'''6E5''' – Top-view, "Magic Eye"-type tuning indicator, UX6 base; '''6G5/6U5''' with a sharp-cutoff driver triode; '''2E5''' with a different heater*'''6G5/6U5''' – Top-view, "Magic Eye"-type tuning indicator, UX6 base; '''6E5''' with a remote-cutoff driver triode; '''2G5''' with a different heater:*'''6G5G/6U5G''' – 6G5/6U5 with an Octal base*'''6GM5''' – 19 W Beam power pentode; 7591 or 7868 with a noval base*'''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*'''6ME5''' – Top-view, "Magic Eye"-type tuning indicator, Miniature 7-pin base B7G*'''6N5''' – See '''6AB5/6N5'''*'''6Q5-G''' = '''884''' – Triode gas [[thyratron]] used in [[DuMont Laboratories|DuMont]] oscilloscopes as a sweep generator; 2B4 = 885 with a 6.3 V/600 mA heater and an Octal base*'''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*'''6U5''' – See '''6G5/6U5'''*'''7591''' – 19 W Beam power pentode; 6GM5 or 7868 with a 7-pin Octal base. Found in many guitar amps made by [[Gibson Guitar Corporation|Gibson]] and [[Ampeg]] [[File:Commons-logo.svg|16x16px|link=:Commons:Category:7591A (vacuum tube)|class=noviewer|alt=]]*'''7868''' – 19 W Beam power pentode; 6GM5 or 7591 with a Novar (Magnoval) base. Found in many of the once popular ''Challenger'' series ''PA'' amps made by Bogen Communications, also found in some guitar amplifiers made by Ampeg*'''ACH1''' – Remote-cutoff [[Pentagrid converter#Hexode|triode/hexode mixer]], European ''Hexode'' 7-pin base with hexode control grid 1 on top cap; BCH1 with a 4 V/1 A heater*'''AZ11''' – Full-wave rectifier, AZ1 with Y8A ''steel tube'' base*'''AZ12''' – Full-wave rectifier, AZ4 with Y8A ''steel tube'' base*'''DCH22''' – Remote-cutoff triode/hexode mixer, B8G Loctal base*'''DF23''' – Remote-cutoff RF/IF pentode, B8G Loctal base*'''DL26''' – Power pentode, B8G Loctal base*'''EB1''' – Dual diode, side-contact 5 base*'''EB2''' – Dual diode, side-contact 5 base<ref name="TFKtubes" />*'''EB11''' – Dual diode with separate cathodes; EB4 or EB34 with a Y8A ''steel tube'' base*'''EB34''' – Dual diode with separate cathodes; EB4 or EB11 with an Octal base*'''EC53''' – VHF triode for use as an oscillator up to 600 MHz, 3-pin base with grid and anode on top caps*'''EK2''' – Remote-cutoff octode pentagrid converter with g4 on top cap; similar to AK2; EK32 with a side-contact 8 base*'''EK3''' – Remote-cutoff beam octode pentagrid converter, side-contact 8 base with g4 on top cap; similar to AK2; CK3 with a different heater*'''EM800''' – Side-view, bar graph-type tuning/level indicator, noval B9A base===='''FDD'''====*'''FDD20''' – Common cathode dual power triode, 12.6 V/350 mA heater, side-contact 8 base - available with two different pinouts;<ref>[https://frank.pocnet.net/short/052/3/372.pdf FDD20 vademecum data], [http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Trioden/FDD20/FDD20_Sockel_Codex_1.gif pinouts]</ref> similar to 53, 6A6, 6N7G===='''PCE'''====*'''PCE82''' – Triode - CRT drive beam tetrode*'''VY2''' – 250 V, 20 mA Half-wave rectifier, 30 V heater, side-contact 5 base*'''QB3/200''' (4-65A, 8165) – Beam tetrode, 5-pin ''Septar'' base with anode top cap*'''829''' – An indirectly heated dual VHF beam power tetrode. Two 6.3 volt heaters sharing a common tap, ''Septar'' base with dual anode top cap*'''884''' = '''6Q5-G''' ([[DuMont Laboratories|DuMont]]) – An indirectly heated triode [[thyratron]]; 885 with a 6.3 V/600 mA heater and an Octal base. Once commonly used as a horizontal sweep sawtooth generator in oscilloscopes*'''885''' = '''2B4''' (DuMont) – 884 with a 2.5 V/1.4 A heater and an American 5-Pin (UY) base*'''6С33С''' ⟼ '''6S33S''' – Power triode for use in series-pass voltage regulators, ''Septar'' base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:6S33S|class=noviewer|alt=]]*'''ГИ-7Б''' ⟼ '''GI-7B''' – Forced-air cooled, half-indirectly heated impulse triode up to 3.3 GHz*'''ГИ-70Б''' ⟼ '''GI-70B''' – ГИ-7Б without heat sink, for use with other cooling methods*'''ГМ-70''' ⟼ '''GM-70''' – 125 W Modulator triode*'''ГС-31Б''' ⟼ '''GS-31B''' – Half-indirectly heated UHF transmitter triode, 360 mW@500 MHz, 180 mW@1 GHz*'''ГС-37''' ⟼ '''GS-37''' – Half-indirectly heated ceramic/metal SHF [[frequency multiplier]] triode up to 8 GHz*'''ГУ-29''' ⟼ '''GU-29''' – Indirectly heated, dual VHF beam power tetrode*'''ГУ-78Б''' ⟼ '''GU-78B''' – Linear VHF transmitter tetrode up to 250 MHz*'''3S4/DL92''' – 270 mW AF power pentode, Miniature 7-pin base, 2.8 V/50 mA (series) or 1.4 V/100 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 [[File:Commons-logo.svg|16x16px|link=:Commons:Category:3S4T|class=noviewer|alt=]]*'''AB1''' – Dual common cathode signal diode, 650 mA heater, 5-pin base*'''AB2''' – AB1 with a side-contact 5 base; CB2 with a different heater*'''ABC1''' – Dual diode + triode, side-contact 8 base, CBC1 with a 4 V/650 mA heater*'''ABL1''' – Dual diode + 9-watts power pentode, EBL1 with a 4 V/2.4 A heater*'''AC2''' – Triode for use as AF amplifier or as oscillator together with an AH1 mixer; side-contact 8 base, EC2 with a 4 V/650 mA heater*'''AC50/4686''' – 3 mA<sub>avg</sub>, 300 mA<sub>peak</sub>, Argon-filled triode [[thyratron]], side-contact 8 base with grid on top cap, for [[relaxation oscillator]]s up to 50 kHz; 4 V/600 mA heater*'''AD1''' – ''Directly'' heated, 4.2 W power triode, side-contact 8 base, 4 V/950 mA filament*'''AF2''' – Remote-cutoff pentode, 4 V/1.1 A heater*'''{{Visible anchor|AF3}}''' – Remote-cutoff pentode, side-contact 8 base, CF3 with a 4 V/650 mA heater*'''{{Visible anchor|AF7}}''' – Sharp-cutoff pentode, side-contact 8 base, 4 V/650 mA heater*'''AH1''' – Remote-cutoff hexode for use as mixer or RF gain control, side-contact 8 base, CH1 with a 4 V/650 mA heater*'''AH100''' – Remote-cutoff hexode for use as mixer or RF gain control*'''AK1''' – Octode [[pentagrid converter]], UX7 base, 4 V/650 mA heater*'''AK2''' – Octode pentagrid converter, side-contact 8 base, CK1 with a 4 V/650 mA heater; similar to EK2*'''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, 4 V/1 A heater*'''AL4''' – AF power pentode, EL3N with a 4 V/1.75 A heater*'''AL5''' – AF power pentode, [[#EL5|{{color|Green|EL5}}]] with a 4 V/2 A heater*'''AL860''' – ''Directly'' heated, 3 W RF/AF power pentode, noval base; center-tapped, 4.8 V/280 mA (series) or 2.4 V/560 mA (parallel) filament*'''AM1''' – Top-view, "Magic Cross"-type [[Magic eye tube|tuning indicator]], side-contact 8 base, EM1 with a 4 V/300 mA heater*'''AZ1''' – 100 mA Full-wave rectifier, side-contact 8 base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:AZ1 (vacuum tube)|class=noviewer|alt=]]*'''AZ2''' – 160 mA Full-wave rectifier, side-contact 8 base*'''AZ3''' – 120 mA Full-wave rectifier, side-contact 8 base*'''AZ4''' – 200 mA Full-wave rectifier, side-contact 8 base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:AZ4 (vacuum tube)|class=noviewer|alt=]]*'''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*'''CBC1''' – Common cathode dual diode + triode, side-contact 8 base, ABC1 with a 13 V heater*'''CBL1''' – Common cathode dual diode + power pentode, side-contact 8 base, 44 V heater*'''CBL6''' – Common cathode dual diode + power pentode, side-contact 8 base, 44 V heater*'''CBL31''' – Common cathode dual diode + power pentode, CBL1 with an Octal base*'''CC2''' – Triode for use as AF amplifier or as oscillator together with an CH1 mixer; side-contact 8 base, AC2 with a 13 V heater*'''CCH1''' – [[Pentagrid converter#Hexode|Triode/hexode mixer]], side-contact 8 base, 20 V heater*'''CCH35''' – Triode/hexode mixer, ECH3 with an Octal base and a 7 V heater*'''CF3''' – Remote-cutoff pentode, side-contact 8 base, [[#AF3|{{color|Green|AF3}}]] with a 13 V heater*'''CF7''' – Sharp-cutoff pentode, side-contact 8 base, [[#AF7|{{color|Green|AF7}}]] with a 13 V heater*'''CF50''' – [[Microphone preamplifier]] sharp-cutoff pentode, side-contact 8 base with control grid on top cap, 30 V heater*'''CH1''' – Remote-cutoff hexode mixer, side-contact 8 base, AH1 with a 13 V heater*'''CK1''' – Octode [[pentagrid converter]], side-contact 8 base, AK2 with a 13 V heater*'''CK3''' – Beam octode pentagrid converter, side-contact 8 base, EK3 with a 19 V heater*'''CL1''' – 5 Watts power pentode for anode voltages above 200 V, side-contact 8 base, 13 V heater*'''CL2''' – 8 Watts power pentode for anode voltages below 200 V, side-contact 8 base, BL2 with a 24 V heater*'''CL4''' – 9 Watts power pentode, side-contact 8 base, 33 V heater*'''CL6''' – 5 Watts power pentode, side-contact 8 base, 35 V heater*'''CY1''' – 250 V, 80 mA Half-wave rectifier, side-contact 8 base, 20 V heater*'''CY2''' – Separate cathodes dual<ref name="DesigConflict">This tube's designation is inconsistent with the scheme</ref> 250 V, 60 mA rectifier, side-contact 8 base, 30 V heater, for use as half-wave rectifier or as [[voltage doubler]]*'''DA90''' – Indirectly heated FM detector diode, Miniature 7-pin base, 1.4 V/150 mA heater*'''DAC21''' – AM detector diode + AF triode, Octal base, 1.4 V/25 mA filament*'''DAC32''' – AM detector diode + AF triode, Octal base, 1.4 V/50 mA filament*'''DAF11''' – AM detector diode + AF pentode, wide-range 0.9-1.5 V/50 mA filament, German 5+3-pin ''steel tube'' base with 1 unused pin*'''DAF40''' – AM detector diode + 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 body, circular 8-pin/pigtails base, 1.25 V/25 mA filament*'''DAF91/1S5''' – AM detector diode + AF pentode, Miniature 7-pin base, 1.4 V/50 mA filament [[File:Commons-logo.svg|16x16px|link=:Commons:Category:1S5T|class=noviewer|alt=]]*'''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*'''DAH50''' – Diode + low (15-25 V) anode voltage pentode with extra beam-forming rods and a [[Tetrode#Space charge grid tube|space charge grid]] between cathode and control grid (technically a heptode); center-tapped, 2.8 V/25 mA (series) or 1.4 V/50 mA (parallel) filament; cf. 6FS5, 6GU5, EF8, EF38*'''DBC21''' – Dual diode + triode, 1.4 V/50 mA filament*'''{{Visible anchor|DC11}}''' – AF driver triode for [[#DDD11|{{color|Green|DDD11}}]], wide-range 0.9-1.5 V/25 mA filament, German 5+3-pin ''steel tube'' base with 3 unused pins*'''DC70/6375''' – Subminiature UHF triode for [[walkie-talkie]]s, all-glass round cross-section body, circular 8-pin/pigtails base, 1.25 V/200 mA filament*'''DC90''' – Triode, FM receiver oscillator/mixer/amplifier, Miniature 7-pin base, 1.4 V/50 mA filament*'''DC96''' – Triode, FM receiver oscillator/mixer/amplifier, Miniature 7-pin base, 1.4 V/25 mA filament<ref name="RöTaTa1974" />*'''DCC90''' – Dual triode, RF amplifier or oscillator, Miniature 7-pin base; center-tapped, 2.8 V/110 mA (series) or 1.4 V/220 mA (parallel) filament*'''DCF60/1V6''' – Triode + pentode, oscillator/mixer, all-glass flat 7-pin pigtailed, 1.25 V/40 mA filament*'''DD960''' – VHF power triode, Miniature 7-pin base; center-tapped, 2.4 V/100 mA (series) or 1.2 V/200 mA (parallel) filament*'''{{Visible anchor|DDD11}}''' – Dual AF power triode, wide-range 0.9-1.5 V/100 mA filament, German 5+3-pin ''steel tube'' base with 1 unused pin – preferred driver is [[#DC11|{{color|Green|DC11}}]]*'''DF11''' – Remote-cutoff RF/IF pentode, wide-range 0.9-1.5 V/100 mA filament, German 5+3-pin ''steel tube'' base with 2 unused pins*'''DF21''' – Sharp-cutoff RF/IF/AF pentode, Octal base, 1.4 V/25 mA filament*'''DF22''' – Remote-cutoff RF/IF pentode, Octal base, 1.4 V/50 mA filament*'''DF33''' – Remote-cutoff RF/IF pentode, Octal base, 1.4 V/50 mA filament<ref name="Vade176" />*'''DF60/5678''' – Subminiature sharp-cutoff RF/IF/AF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 1.25 V/50 mA filament*'''DF61''' – Subminiature sharp-cutoff RF or mixer pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 1.25 V/25 mA filament*'''DF62/1AD4''' – Subminiature sharp-cutoff RF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 1.25 V/100 mA filament, for use as RF/IF stage*'''DF63''' – Subminiature remote-cutoff RF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 1.25 V/25 mA filament, for use as RF/IF stage*'''DF64''' – Subminiature AF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 0.625 V/10 mA filament, for use in [[hearing aid]]s*'''DF65''' – Subminiature AF pentode, all-glass round cross-section body, circular 5-pin/pigtails base, 0.625 V/13.3 mA filament, for use in hearing aids*'''DF66''' – Subminiature AF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 0.625 V/15 mA filament, for use in hearing aids*'''DF67/6008''' – DF65 with round cross-section body, but flat 5-pin base*'''DF70''' – Subminiature AF pentode, all-glass round cross-section body, circular 8-pin/pigtails base, 0.625 V/25 mA filament, for use in hearing aids*'''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/mixer pentode, Miniature 7-pin base, 1.4 V/25 mA filament*'''DF97/1AN5''' – Remote-cutoff RF/IF pentode, Miniature 7-pin base, 1.4 V/25 mA filament*'''DF167''' – Subminiature AF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 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*'''DF668''' – Subminiature RF pentode, all-glass elliptical cross-section body, flat 5-pin base, 1.25 V/100 mA filament, similar to 1AD4*'''DF669''' – Subminiature RF/IF pentode, all-glass elliptical cross-section body, flat 5-pin base, 1.25 V/50 mA filament, similar to 5678*'''DF703''' (CK5886) – Subminiature [[electrometer]] pentode, envelope has a moisture-repellent coating, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 1.25 V/10 mA filament, for probe amplifiers*'''DF961''' – Sharp-cutoff SW/VHF pentode, Miniature 7-pin base, 1.2 V/60 mA filament*'''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*'''DK21''' – Octode beam pentagrid converter, 1.4 V/50 mA filament*'''DK32/1A7''' – Heptode pentagrid converter, 1.4 V/50 mA filament*'''DK40''' – Octode pentagrid converter, 1.4 V/50 mA filament*'''DK91/1R5''' – 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*'''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*'''DL11''' – 350 mW AF power pentode, wide-range 0.9-1.5 V/50 mA filament, German 5+3-pin ''steel tube'' base with 2 unused pins*'''DL21''' – 700 mW AF power pentode, Octal base, 1.4 V/50 mA filament*'''DL33/3Q5GT''' – 400 mW AF power pentode with a center-tapped, 2.8 V/50 mA (series) or 1.4 V/100 mA (parallel) filament*'''DL41''' – 600 mW Power pentode; center-tapped, 2.8 V/50 mA (series) or 1.4 V/100 mA (parallel) filament*'''DL64''' – Subminiature AF power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, for use in [[hearing aid]]s, U<sub>A</sub> = 15 V, U<sub>Amax</sub> = 45 V, 1.25 V/10 mA filament*'''DL65''' – Subminiature AF power pentode, all-glass round cross-section body, circular 5-pin/long pigtails base, for use in hearing aids, DL67/6007 with a different pinout, U<sub>A</sub> = 22.5 V, U<sub>Amax</sub> = 45 V, 1.25 V/13 mA filament*'''DL66''' – Subminiature AF power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, for use in hearing aids, U<sub>A</sub> = 22.5 V, U<sub>Amax</sub> = 45 V, 1.25 V/15 mA filament*'''DL67/6007''' – DL65 with round cross-section body, but flat 5-pin base*'''DL68''' – Subminiature AF power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, for use in hearing aids, U<sub>A</sub> = 22.5 V, U<sub>Amax</sub> = 45 V, 1.25 V/25 mA filament*'''DL69''' – Subminiature power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, U<sub>A</sub> = 90 V, 1.25 V/25 mA filament*'''DL70''' – Subminiature VHF power pentode up to 200 MHz, all-glass round cross-section body, circular 8-pin/pigtails base, for use in [[walkie-talkie]]s, U<sub>A</sub> = 150 V, 1.25 V/110 mA filament*'''DL71''' – Subminiature AF power pentode, all-glass round cross-section body, circular 8-pin/pigtails base, for use in hearing aids, U<sub>A</sub> = 22.5 V, U<sub>Amax</sub> = 45 V, 1.25 V/25 mA filament*'''DL72''' – Subminiature AF power pentode, all-glass round cross-section body, circular 8-pin/pigtails base, for use in hearing aids, U<sub>Amax</sub> = 45 V, 1.25 V/25 mA filament*'''DL73''' (CV2299) – Subminiature VHF power pentode up to 200 MHz, all-glass round cross-section body, circular 8-pin/pigtails base, for use in walkie-talkies, U<sub>A</sub> = 150 V, 1.25 V/200 mA filament*'''DL92/3S4''' – 270 mW AF power pentode with a center-tapped, 2.8 V/50 mA (series) or 1.4 V/100 mA (parallel) filament, Miniature 7-pin base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:3S4T|class=noviewer|alt=]]*'''DL93/3A4''' – 1.2 W RF/AF power pentode with a center-tapped, 2.8 V/100 mA (series) or 1.4 V/200 mA (parallel) filament, Miniature 7-pin base*'''DL94/3V4''' – 1.3 W AF power pentode with a center-tapped, 2.8 V/50 mA (series) or 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) or 1.4 V/100 mA (parallel) filament, Miniature 7-pin base*'''DL96/3C4''' – 440 mW AF power pentode with a center-tapped, 2.8 V/25 mA (series) or 1.4 V/50 mA (parallel) filament, Miniature 7-pin base*'''DL97/3Y4''' – Power pentode with a center-tapped filament, Miniature 7-pin base<ref>[https://www.radiomuseum.org/tubes/tube_dl97.html DL97/3Y4 on radiomuseum.org]</ref>*'''DL98/3B4''' – 1.25 W RF power pentode with a center-tapped, 2.5 V/165 mA (series) or 1.25 V/330 mA (parallel) filament, up to 100 MHz, Miniature 7-pin base*'''DL167''' – 1.8 mW Subminiature AF power pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, 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) or 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 body, flat 5-pin base, long pigtails, U<sub>Amax</sub> = 90 V, 1.25 V/50 mA filament*'''DL962''' – 150 mW AF power pentode with a center-tapped, 2.4 V/60 mA (series) or 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) or 1.2 V/200 mA (parallel) filament, Miniature 7-pin base*'''DM21''' – Top-view, "Magic Eye"-type [[Magic eye tube|tuning indicator]], 1.4 V/25 mA filament*'''DM160/6977''' (ИВ-15↦IV-15) – First [[vacuum fluorescent display]], single segment, side-view, for use as [[Flip-flop (electronics)|flip-flop]] status indicator in [[Wiktionary:transistorized|transistorized]] computers. All-glass pigtailed, 1 V/30 mA filament*'''EBL1''' – Dual diode + 9-watts power pentode, EBL21 or EBL31 with a side-contact 8 base, ABL1 with a different heater*'''ECH2''' – Triode/heptode mixer, side-contact 8 base<ref>[https://frank.pocnet.net/short/054/3/328.pdf ECH2 vademecum data]</ref>*'''ECH3''' – [[Pentagrid converter#Hexode|Triode/hexode mixer]], ECH33 with a side-contact 8 base*'''ECH4''', '''ECH4K''', '''ECH4N''' – Triode/heptode mixer, ECH21 with a side-contact 8 base*'''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 (electronics)|noise]] (technically a hexode), EF38 with a side-contact 8 base*'''EL2''' – Power pentode, EL32 with a side-contact 8 base, control grid on top cap*'''EL3''', '''EL3N''' – Power pentode, EL11 or EL33 with a side-contact 8 base*'''EM1''' (''4678'') – Top-view, "Magic Eye"-type [[Magic eye tube|tuning indicator]], side-contact 8 base*'''EM4''', '''EM4N''' – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, EM34 with a side-contact 8 base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:EM4 (vacuum tube)|class=noviewer|alt=]]*'''EM5''' – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator, EM11 or EM35 with a side-contact 8 base*'''[[25L6]]''' – Beam power pentode, 12L6 or 50L6 with a different heater; besides AA5, also popular for high-speed [[Logic gate|gating]], or as a relay or a [[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 [[Hot cathode#Failure modes|cathode poisoning]] after prolonged periods in [[Cut-off (electronics)|cut-off]], the [[#EIA professional tubes system|{{color|Green|EIA}}]]-type 6046 was derived from it, which didn't suffer from this problem [[File:Commons-logo.svg|16x16px|link=:Commons:Category:25L6|class=noviewer|alt=]]::For '''examples''' [[#O - No heater|{{color|Green|see below under '''O'''}}]]. This part lived on in the later [[Pro Electron#Semiconductor diodes and transistors|''Pro Electron'' semiconductor designation system]]*'''6FL2''' = '''ECF812''' – Triode + low-power beam tetrode, noval base, 30FL2 (=PCF812) with a different heater*'''10M2''' = '''UM35''' (UM4) – Dual-sensitivity, top-view, "Magic Eye"-type tuning indicator*'''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*'''U26''' = '''2J2/KY80''' – [[Cathode-ray tube|CRT]] [[High voltage|EHT]] rectifier, noval base*'''GT1C''' – Argon-filled, 500 V/300 mA thyratron extensively used in the [[Colossus computer]], 4 V/1.3 A heater, 5-pin base*'''N309''' = '''15A6/PL83''' – CRT cathode drive power pentode*'''1S5/DAF91''' – Diode + sharp-[[Cut-off (electronics)|cutoff]] pentode Class-A amplifier, used as detector and first AF stage in battery radio receivers. Anode voltage in the 67...90 volt range, 50 mA filament:*'''1S5-SF''' = '''1S5T''' = '''1AR5''' – 1S5/DAF91 with a 25 mA filament [[File:Commons-logo.svg|16x16px|link=:Commons:Category:1S5T|class=noviewer|alt=]]*'''6441''' – ... cf. EC860*'''EC860''' – ... cf. 6441*'''ELL80/6HU8''' – Dual AF power pentode, Noval base, PLL80/12HU8 with a different heater*'''KY80/2J2''' = '''U26''' (EdiSwan) – [[Cathode-ray tube|CRT]] [[High voltage|EHT]] rectifier, noval base*'''PLL80/12HU8''' – Dual AF power pentode, ELL80/6HU8 with a different heater*'''ULL80''' – Dual AF power pentode; ELL80, PLL80 with a different heater===='''MC'''====*'''MC1/50''' – 1 kV, 50 W Radiation-cooled triode*'''MC1/60''' – 1 kV, 60 W Radiation-cooled triode*'''MC2/200''' – 2 kV, 200 W Radiation-cooled 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===='''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*'''ACT9''' – 800 W (convection) or 1100 W (forced) '''A'''ir '''c'''ooled '''t'''ransmitting triode up to 15 MHz, with derating up to 80 MHz; 16 V/22 A heater*'''TT21''' = '''7623''' (6.3 V/1.6 A heater), '''TT22''' = '''7624''' (12.6 V/800 mA heater) – 37.5 W AF/RF beam power tetrode up to 30 MHz, derived from [[KT88]]http://www.frank.mif.pg.gda.pl/ got wiped. Trying https://frank.pocnet.net/=={{anchor|NT1910}}List of tubes used in 1910s radio receivers== to =={{anchor|O1915}}List of other tubes before c. 1925====List of other tubes before c. 1925===={{anchor|NT1920}}List of tubes used in 1920s and 1930s radio receivers== to =={{anchor|O1925}}List of other tubes c. 1925–35{{anchor|List of tubes used in 1920s and 1930s radio receivers}}====List of other letter tubes== and ==List of other number tubes== into ==List of other tubes since c. 1935=====Lettered Loctal tubes used in [[Philco]] radios=== into ==List of other tubes since c. 1935==For the earliest tubes, this letter was optionally followed by a sequentially assigned, single digit ([[#O1915|{{color|Green|examples}}]]); later tubes were assigned numbers according to the following scheme:*'''1C8''' – Heptode [[pentagrid converter]], all-glass round cross-section body and circular 8-pin/pigtails base*'''1E8''' – Heptode pentagrid converter, all-glass round cross-section body, circular 8-pin/pigtails base*'''1A7GT/DK32''' – Heptode [[pentagrid converter]], re-engineered version of types '''1A6''' and '''1D7-G''', designed for use in portable AC/DC/Dry-cell battery radios introduced in 1938. Has 1.4 V/50 mA filament*'''1B7-GT''' – Heptode pentagrid converter, re-engineered version of types '''1C6''' and '''1C7-G''', designed for use in dry-cell battery radios with shortwave bands. Has 1.4 V/100 mA filament*'''[[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 Electronics|Zenith]] [[Trans-Oceanic]] [[shortwave radio]], 50 mA filament*'''1LB6''' – Heptode pentagrid converter for battery-operated radios*'''1R5/DK91''' – Heptode pentagrid converter, anode voltage in the 45...90 volt range*'''1A6''' – Heptode [[pentagrid converter]] 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*'''1C6''' – Heptode pentagrid converter; '''1A6''', with double the heater power and double the frequency range*'''2A7''' – Heptode [[pentagrid converter]] (Except for heater, electronically identical to types '''6A7''', '''6A8''' and '''12A8''')*'''6A7''' and '''6A8''' (''PH4'', ''X63'') – Heptode [[pentagrid converter]], based on type '''2A7''', which had a 2.5 volt heater. 6A7 has a UX7 base with top cap connection for [[control grid]] (grid 4). 6A8 is octal version with top cap connection for control grid. Loctal version: type '''7B8'''*'''6BE6/EK90''', 5750, X727 – Heptode [[pentagrid converter]] (Often encountered in car radios)*'''6D8-G''' – Heptode [[pentagrid converter]]; similar to type '''6A8'''. Octal base with top cap. Has 150 mA heater. Used in pre-war 6-volt [[Antique radio#Farm radios|farm radios]]*'''6L7''' – Heptode [[pentagrid converter]] often used in console radios of the late 1930s. Similar in structure to pentode-triode pentagrid converters '''6SA7''' and '''6BE6''', except that a separate oscillator – usually type '''6C5''' – is required. Also, grid 1 is remote-cutoff control grid, grid 3 is oscillator input grid. (In types 6SA7 and 6BE6, grid 1 is the internal oscillator grid, grid 3 is the control grid) 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)*'''6SA7''' – First heptode [[pentagrid converter]]. Octal type. Miniature version: '''6BE6'''*'''6SB7Y''' (Octal base), '''6BA7''' and '''12BA7''' (Noval base) – VHF heptode pentagrids, 1946*'''7B8''' – Heptode [[pentagrid converter]], Loctal version of types '''6A7''' and '''6A8'''*'''7Q7''' – Heptode pentagrid converter; similar to type '''6SA7'''*'''12SA7''' – Heptode pentagrid converter (Octal version of '''12BE6/HK90''')*'''14B8''' – Heptode [[pentagrid converter]], Loctal version of type '''12A8'''*'''14Q7''' – Heptode pentagrid converter; similar to type '''12SA7'''*'''1612''' – Heptode [[pentagrid converter]]; low-microphonics version of type '''6L7'''. Both control grids (1 and 3) are sharp-cutoff===={{anchor|OEESR}}'''ESR'''===={{H:title|Elektronische Steuerapparate AG, Bad Ragaz, Canton of St. Gallen, Switzerland; now a GmbH and a member of the PILZ GmbH & Co. KG group|Elesta}}:([[:de:Ionisationsrauchmelder#Geschichte|de]])*'''ESR2''' – Gas-filled, [[cold cathode]] ''Trigger pentode'' (two starter electrodes and a primer electrode) + two [[Voltage-regulator tube|voltage references]], for use in precision timers<ref name="ESR2">{{cite web |url=http://lampes-et-tubes.info/rs/ESR2.pdf |title=Tube relais, avec stabilisateurs incorporés |language=fr |publisher=Elesta |access-date=21 January 2020}}</ref>*'''PBG12205''' = '''BG12205''' ([[Burroughs Corporation|Burroughs]])<ref>[http://lampes-et-tubes.info/cd/BG12205-2.pdf 201-element dual linear bar graph display]</ref> – Neon-filled, planar, dual 201-segment linear glow-transfer bar graph display tube with five cathode strings, for use in VU meters etc.[[Philips]] (Typecode explained [[#Philips system before 1934|{{color|Green|above}}]]):*'''B2''' – Directly heated triode, 1.7 V/150 mA filament*'''B6''' – Directly heated tetrode, 1.7 V/150 mA filament*'''D1''' – Directly heated, gas-filled triode, 3.5 V/500 mA filament, used in 1920s [[Tuned radio frequency receiver|TRF]] and [[Regenerative circuit|regenerative]] radios*'''D2''' – Directly heated triode, 3.5 V/500 mA filament*'''D3''' – Directly heated triode, 3.0 V/500 mA filament*'''D4''' – Directly heated, gas-filled tetrode, 3.5 V/500 mA filament*'''D5''' – Directly heated triode, 3.5 V/500 mA filament*'''D6''' – Directly heated triode, 3.5 V/500 mA filament*'''E''' – Directly heated triode, 4 V/700 mA filament, derived from the French '''TM''' tubehttp://www.mif.pg.gda.pl/homepages/frank/ reflinks to http://www.frank.mif.pg.gda.pl/*'''6F22''' (6267, EF86/6BK8/6CF8) – Low-noise AF pentode, 9-pin noval base*'''[[6BK8]]/6CF8/EF86''', Z729 – Audio Pentode used in [[microphone preamplifier]]s and audiophile equipment [[File:Commons-logo.svg|16x16px|link=:Commons:Category:EF86|class=noviewer|alt=]]*'''EC8010/8556''' – UHF triode for use as amplifier or oscillator up to 1 GHz*'''ECC82/[[12AU7]]''' (''6067, M8136, B329'') – Medium-mu dual triode with a center-tapped heater for use as AF amplifier, noval base, identical to XCC82/7AU7 except for heater ratings. Two EC90/6C4s in one envelope;<ref name="Brimar12AU7" /> however, it is only specified as an audio frequency device [[File:Commons-logo.svg|16x16px|link=:Commons:Category:12AU7/ECC82|class=noviewer|alt=]]*'''ECF801/6GJ7''' – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers, noval base, identical to LCF801/5GJ7, PCF801/8GJ7 and XCF801/4GJ7 except for heater ratings*'''ECF805/6GV7''' – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers, noval base, PCF805/7GV7 with a different heater*'''ECF812''' = '''6FL2''' (EdiSwan) – Triode + low-power beam tetrode, noval base,<ref name="xCF812">[http://www.mif.pg.gda.pl/homepages/frank/sheets/084/e/ECF812.pdf E/PCF812 data sheet]</ref> PCF812 with a different heater*'''EF80/6BX6''' (''Z152'') – Sharp-cutoff RF/IF/Video pentode, noval base, identical to XF80/3BX6, 12BX6 and UF80/19BX6 except for heater ratings [[File:Commons-logo.svg|16x16px|link=:Commons:Category:EF80|class=noviewer|alt=]]*'''[[EF86]]/6BK8/6CF8''' (''6267, Z729'') – AF Pentode, also for use in ''[[Dynatron oscillator|Transitron]]'' circuits in TV receivers. Identical to PF86 and UF86 except for heater ratings, noval base [[File:Commons-logo.svg|16x16px|link=:Commons:Category:EF86|class=noviewer|alt=]]*'''EF806S/6267''' – Ruggedized, long-life AF pentode*'''PCF87''' = '''30C17''' (EdiSwan) – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers<ref>PCF87 on [https://www.radiomuseum.org/tubes/tube_pcf87.html radiomuseum.org], [http://www.r-type.org/exhib/aai0119.htm r-type.org]</ref>*'''PCF800''' (30C15) – Triode + pentode for use as VHF mixer in TV receivers*'''PCF801/8GJ7''' – Triode + remote-cutoff pentode for use as VHF mixer in TV receivers, noval base, identical to ECF801/6GJ7, LCF801/5GJ7 and XCF801/4GJ7 except for heater ratings*'''PCF803''' – PCF801/8GJ7 with separate cathodes*'''PCF805/7GV7''' – 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*'''PCF812''' = '''30FL2''' (EdiSwan) – Triode + low-power beam tetrode, noval base,<ref name="xCF812" /> ECF812 with a different heater*'''UF80/19BX6''' – Sharp-cutoff RF/IF/Video pentode, noval base, identical to XF80/3BX6, EF80/6BX6 and 12BX6 except for heater ratings*'''XCC82/7AU7''' – Dual triode, identical to ECC82/[[12AU7]] except for heater ratings*'''XCF82/5U8''' – Triode + pentode, identical to [[#ECF82|{{color|Green|ECF82/6U8}}]] and PCF82/9U8A except for heater ratings*'''XCH81/3AJ8''' – Triode/heptode oscillator/mixer, ECH81/6AJ8 with a different heater*'''XCL82/8B8''' – AF triode - AF power pentode, identical to [[#ECL82|{{color|Green|ECL82/6BM8}}]], PCL82/16A8 and UCL82/50BM8 except for heater ratings*'''XF80/3BX6''' – Sharp-cutoff RF/IF/Video pentode, noval base, identical to EF80/6BX6, 12BX6 and UF80/19BX6 except for heater ratingswww.geocities.jp/radiomann/ reflinks to radiomann.sakura.ne.jp:*'''A''' – [[Electric arc|Arc discharge]] tube*'''14GT8/7724''', '''14JG8''' – Dual diode, high-mu triode for use as FM detector and AF amplifier*'''50JY6''' – Horizontal deflection beam power pentode*'''4HK5''' – VHF frame-grid, [[Control grid#Grid variations|variable-mu]] triode, identical to 2HK5, 3HK5 and 6HK5 except for heater ratings*'''58HE7''' – ''[[Compactron]]'' High-perveance damper diode + horizontal deflection beam power pentode, identical to 6HE7, 12HE7 and 38HE7 except for heater ratings*'''42KN6''' – ''Compactron'' Horizontal deflection beam power pentode, 6KN6 with a different heater*'''10DE7''' – Dual triode (dissimilar triode sections) for use as vertical deflection oscillator and amplifier, 6DE7 or 13DE7 with a different heater*'''30KD6''' – ''[[Compactron]]'' horizontal deflection beam power pentode, identical to 6KD6 and 36KD6/40KD6 except for heater ratings*'''26A6''' – Remote-cutoff pentode with a 12-cell lead-acid battery heater*'''26A7GT''' – Low (26.5-50 V) anode voltage dual 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. 13П1П, 13П1С*'''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 power diode, separate cathodes*'''Z860A''' – 250 V [[Electric arc|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 [[Surge protector#Gas discharge tube (GDT)|Cold-cathode surge protector]] for receiver front ends, Miniature 7-pin base*'''Z0.7/10U''' – 700 V, 500 mA<sub>avg</sub>, 10 A<sub>peak</sub>, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage<ref name="DesigConflict" />*'''Z0.7/100U''' – 700 V, 2 A<sub>avg</sub>, 100 A<sub>peak</sub>, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage, for triggering ignitrons<ref name="DesigConflict" />*'''Z1/100U''' – 1 kV, 2 A<sub>avg</sub>, 100 A<sub>peak</sub>, Gas-filled, cold-cathode DC arc trigger tetrode, one starter and a primer electrode, positive starter voltage, for use in welding machines<ref name="DesigConflict" />==={{anchor|RuP}}Professional tubes===*'''СО-242''' ⟼ '''SO-242''' – Heptode with an oxide-coated cathode*'''БХ''', '''БХВ''', '''БСМ''', '''БСВ''' ⟼ '''BH''', '''BHV''', '''BSM''', '''BSV''' – [[X-ray tube]]:*'''ВГ''' ⟼ '''VG''' – Gas-discharge or mercury-vapor rectifier:*'''ЛС''' ⟼ '''LS''' – [[Charactron]] ({{lang-ru|Знакопечатающая трубка}} "Typographic tube")*'''М''' ⟼ '''M''' – [[Cavity magnetron|Magnetron]]:*'''МИ''' ⟼ '''MI''' – Pulse Magnetron*'''СБМ''', '''СБС''', '''СБТ''', '''СИ''', '''СГМ''', '''СТС''' ⟼ '''SBM''', '''SBS''', '''SBT''', '''SI''', '''SGM''', '''STS''' – [[Geiger–Müller tube]]:*'''ФЭК''' ⟼ '''FEK''' – High-speed pulse phototube with a coaxial output connector*'''28D7W''' – Low (28-100 V) anode voltage dual 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-force|g]], for use as a push–pull audio amplifier, or as switching element of a self-excited [[Push–pull converter|push–pull DC/DC converter]] to provide up to 725 mW of anode high voltage supply for conventional tubes; cf. 13П1П, 13П1С*'''6498''' – ''Memotron'', a [[storage tube]]<ref>{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/201/6/6498.pdf |publisher=[[Hughes Aircraft Company]] |title=''6498 Memotron 5-inch Bright Display Cathode-Ray-Type Storage Tube'' data sheet |date=4 February 1955 |access-date=30 September 2017}}</ref>*'''6499''' – [[Selectron tube|Radechon]], an early form of digital [[computer memory]]<ref>{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/049/6/6499.pdf |publisher=[[RCA]] Electron Tube Division |title=''6499 Charge Storage Tube, single beam, barrier-grid type, non-equilibrium write, capacitance-discharge reading'' data sheet |date=August 1956 |access-date=30 September 2017}}</ref>*'''ОГ-3''' ⟼ '''OG-3''' – Bidirectional decade ''Counter [[Dekatron]]'' up to 20 kHz, filled with a helium/hydrogen mixture, violet glow*'''ОГ-4''' ⟼ '''OG-4''' – Bidirectional decade ''Counter Dekatron'' up to 2 kHz, neon-filled, orange-red glow*'''ОГ-5''' ⟼ '''OG-5''' – Improved ОГ-4, up to 10 kHz*'''ОГ-7''' ⟼ '''OG-7''' – Decade ''Counter Dekatron'' up to 50 kHz, argon-filled, blue glow*'''ОГ-8''' ⟼ '''OG-8''' – Unidirectional decade ''Counter Dekatron'' up to 100 kHz, argon-filled, argon-filled, blue glow*'''ОГ-9''' ⟼ '''OG-9''' – Unidirectional decade ''Counter Dekatron'' up to 2 kHz, neon-filled, orange-red glow====Marconi-Osram system==== examples*'''D''' – Dual diode*'''DA''' – More than 25 W power triode:*'''PT''' – Power pentode:*'''PX''' – 3...25 W Power triode:*'''LP''' – Power triode*'''VP''', '''VMP''' – Remote-[[Cut-off (electronics)|cutoff]] pentode*'''VS''', '''VMS''' – Remote-cutoff tetrodeIn most cases, the first digit of the following number is the heater voltage:*'''2''' – 2 V*'''3''' – 13 V or 300 mA*'''4''' – 4 V*'''5''' – 5 V (Rectifiers)*'''6''' – 6 V*'''B30''' – Dual [[Amplifier#Class B|Class-B]] power triode*'''DA30''' – AF power triode, P<sub>a</sub>=40 W*'''DA40''' – AF power triode, P<sub>a</sub>=50 W*'''DA41''' – AF power triode, P<sub>a</sub>=30 W*'''DA60''' – AF power triode, P<sub>a</sub>=60 W*'''DA100''' – AF power triode, P<sub>a</sub>=100 W*'''DA250''' – AF power triode, P<sub>a</sub>=250 W:*'''МН''' ⟼ '''MN''' – ''Mechanotron''-type<sup>([[:ru:Механотрон|ru]])</sup> mechano-electronic displacement [[sensor]]<ref name="Mechanotron">{{cite web |url=https://doi.org/10.1007/BF00981999 |author=Berlin, G.S. |publisher=Kluwer Academic Publishers - Plenum Publishers |pages=24–28 |volume=9 |date=September 1970 |title=''Mechanotron transducers and their use in measurement techniques'' |doi=10.1007/BF00981999 |access-date=1 May 2018}}</ref>:*'''МХ''' ⟼ '''MH''' – ''Mechanotron''-type mechano-electronic displacement sensor:*'''МДХ''' ⟼ '''MDH''' – ''Mechanotron''-type mechano-electronic pressure sensor:*'''МУХ''' ⟼ '''MUH''' – ''Mechanotron''-type mechano-electronic rotation sensor*'''Л''' ⟼ '''L''' – [[Beam deflection tube]] incl. [[Cathode-ray tube|CRTs]] ({{lang-ru|Электронно-'''л'''учевые 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):*'''ЛМ''' ⟼ '''LM''' – [[Radar display|Radar CRT]], [[flying-spot scanner]], ''[[Skiatron]]'', etc. with magnetic deflection:*'''ЛО''' ⟼ '''LO''' – CRT for oscilloscopes with [[electrostatic deflection]]*'''Т''' ⟼ '''T''' – [[Thyratron]]:*'''ТГ''', '''ТГИ''' ⟼ '''TG''', '''TGI''' – Gas-filled thyratron:*'''ТР''' ⟼ '''TR''' – Mercury-vapor thyratron*'''6218/E80T''' (CV5724) – Modulated, single-anode [[beam deflection tube]] for pulse generation up to 375 MHz, shock resistant up to 500 [[g-force|g]]<ref name="EIA6218">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/201/6/6218.pdf |publisher=[[Rogers Vacuum Tube Company|Rogers Majestic Corp.]] |title=6218 data sheet, RTMA Engineering Dept. Release #1115 |date=25 August 1952 |access-date=1 May 2017}}</ref><ref name="E80T">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/030/e/E80T.pdf |publisher=[[Philips]] |title=E80T data sheet |date=4 April 1956 |access-date=1 May 2017}}</ref><refname="Bruijsten_Groendijk_Mantz"> {{cite web |url=http://lampes-et-tubes.info/sp/Bruijsten_Groendijk_Mantz.pdf |last1=Bruijsten |first1=J. |last2=Groendijk |first2=H. |last3=Mantz |first3=M. R. |publisher=[[Philips]] |date=Nov-Dec 1952 |title=Philips Electronic Application Bulletin: ''Synchronization of a Variable Frequency Oscillator at Discrete, Stabilized Frequencies with the E80T'' |volume=13 |pages=58-64 |access-date=31 August 2019}}</ref><ref name="Kretzmann">{{cite web |url=http://lampes-et-tubes.info/sp/Kretzmann.pdf |last=Kretzmann |first=R. |publisher=[[Philips]] |title=Philips Technical Library: ''Pulse Delay Circuit using Deflection Tube E80T'' |pages=64-66 |access-date=31 August 2019}}</ref>*'''416B/6280''' – Planar SHF power triode, 500 mW output at 4 GHz*'''6МХ1Б''' ⟼ '''6MH1B''' – ''Mechanotron''-type<sup>([[:ru:Механотрон|ru]])</sup> mechano-electronic displacement [[sensor]]; a vacuum dual diode with one anode mounted on a shaft that extends through a thin, flexible metal diaphragm; shaft movement is reflected in the anode currents difference<ref>{{cite web |url=http://www.155la3.ru/datafiles/6mh1b.pdf |publisher=[[Moscow Electric Lamp Plant|МЭЛЗ/MELZ]] |title=''Механотрон Типа 6МХ1Б'' data sheet |language=ru |access-date=7 August 2019}} • [http://www.155la3.ru/datafiles/6mh1b_tu.pdf other]</ref>*'''6МХ1С''' ⟼ '''6MH1S''' – ''Mechanotron''-type displacement sensor; a vacuum dual diode with both anodes mounted on a shaft that extends through a diaphragm<ref>{{cite web |url=http://lampes-et-tubes.info/sp/6MH1S.pdf |publisher=[[Moscow Electric Lamp Plant|МЭЛЗ/MELZ]] |title=''Механотрон Типа 6МХ1С'' data sheet |language=ru |access-date=7 August 2019}} • [http://lampes-et-tubes.info/sp/sp149.php?l=e on lampes-et-tubes]</ref>*'''6МДХ4С''' ⟼ '''6MDH4S''' – ''Mechanotron''-type pressure sensor; a vacuum dual diode with one anode mounted on a [[Pressure measurement#Bellows|bellows chamber]] that expands or contracts depending on external pressure<ref>{{cite web |url=http://lampes-et-tubes.info/sp/6MDH4S.pdf |publisher=[[Moscow Electric Lamp Plant|МЭЛЗ/MELZ]] |title=''Механотрон Типа 6МДХ4С'' data sheet |language=ru |access-date=7 August 2019}} • [http://lampes-et-tubes.info/sp/sp175.php?l=e on lampes-et-tubes]</ref>*'''16ЛМ4Г''' ⟼ '''16LM4G''' – ''[[Skiatron]]'';<ref>{{cite web |url=http://lampes-et-tubes.info/cr/16LM4G.pdf |title=''16ЛМ4Г'' data sheet |language=ru |access-date=31 August 2019}} on [http://lampes-et-tubes.info/cr/cr148.php?l=e lampes-et-tubes.info]</ref> cf. 4AP10*'''ЛН22''' ⟼ '''LN22''' – [[Storage tube]];<ref>{{cite web |url=http://lampes-et-tubes.info/sc/LN22.pdf |title=''ЛН22'' data sheet |language=ru |access-date=31 August 2019}} on [http://lampes-et-tubes.info/sc/sc049.php?l=e lampes-et-tubes.info]</ref> cf. 6835, 7570, 7571The 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,<ref>{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/other/docs/Tomer_1960_Getting_the_Most_Out_of_Vacuum_Tubes.pdf |last=Tomer |first=Robert B. |publisher=Howard W. Sams Co., Indianapolis |year=1960 |title=Getting the Most out of Vacuum Tubes |lccn=60-13843 |access-date=10 Oct 2013}} - Chapter 6 discusses heater voltages as one of the many factors leading to proliferation of tube types.</ref> 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. See, for example, the [[#RCARC|{{color|Green|RCA Receiving Tube Manuals}}]].* The first character group is always a number, consisting of one to three numerals, and represents the heater voltage rounded to the nearest whole number; '''0''' indicates a [[Cold cathode#Cold-cathode devices|cold-cathode tube]]. Tubes with a center-tapped filament/heater are designated the higher voltage option. Exceptions include 2.0 Volt filament tubes (such as 1C7-G and 1F4) and series heater tubes where the rounding was less exact (such as the 5.9-Volt 5X9 and the 46-Volt 50Y7GT).<ref name="DecoderLinks" />: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 designated the lower voltage option:*'''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*'''MX40''' – Heptode [[pentagrid converter]] with a 4 V/1 A heater and a British 7-pin base with g4 on top cap; similar to the FC4 octode*'''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 [[Band I|VHF Band I]] TV tuners*'''FC4''' – [[Pentagrid converter|Octode '''F'''requency '''C'''onverter]] with a '''4''' V/650 mA heater and a British 7-pin base with g4 on top cap; similar to the MX40 heptode<ref>FC4 on [http://www.r-type.org/exhib/aad0212.htm r-type.org]</ref>*'''ЕГ''', '''ОГ''' ⟼ '''YeG''', '''OG''' – [[Dekatron]]:*'''ЛФ''' ⟼ '''LF''' – Analog [[function generator]]*'''Н''' ⟼ '''N''' – ''[[Nuvistor]]''*'''ЭПЛ''' ⟼ '''EPL''' – Semiconductor/tube hybrid ({{lang-ru|'''Э'''лектронно-'''п'''олупроводниковая '''л'''ампа}})*'''6ES6/EF97''' (remote-cutoff), '''6ET6/EF98''' (sharp-cutoff) – Low (6.3-50 V) anode voltage RF pentodes, used in car radios*'''7610''' – ''Electron bombarded semiconductor tube'' for high-speed, 8-bit [[Analog-to-digital converter|A/D conversion]]; a [[beam deflection tube]] where the analog signal to be digitized deflects a sheet beam across an array of 8 long [[p–n diode|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;<ref>{{cite web |url=http://lampes-et-tubes.info/sc/7612D-ADC.pdf |title= ''7612D – Electron bombarded semiconductor tube for high-speed analog-digital conversion'' |publisher=[[Tektronix]] |access-date=10 July 2019}} on [http://lampes-et-tubes.info/sc/sc023.php?l=e lampes-et-tubes.info]</ref> cf. ЭПЛ-1*'''8203''' – ''Nuvistor'' power triode up to 250 MHz*'''8380''' – ''Nuvistor'' power tetrode for use in [[sonobuoy]]s, up to 80 MHz*'''8382''' – ''Nuvistor'' power triode for use in sonobuoys, up to 175 MHz*'''8441''' – ''Nuvistor'' high-mu triode for use in sonobuoys*'''8456''' – ''Nuvistor'' medium-mu triode for use in sonobuoys*'''8525''', '''8526''', '''8527''' – ''Nuvistor'' medium-mu dual triode*'''8627''' – ''Nuvistor'' power triode up to 1.2 GHz*'''8628''' – ''Nuvistor'' high-mu AF triode for use in [[valve microphone]]s and piezoelectric pickup preamplifiers up to 200 kHz*'''8808''' – ''Nuvistor'' high-mu triode up to 1.2 GHz*'''AC104''' – Triode<ref>[https://www.radiomuseum.org/tubes/tube_ac104.html AC104 on radiomuseum.org]</ref>*'''AL60''' – Power pentode<ref>AL60 on [https://www.radiomuseum.org/tubes/tube_al60.html radiomuseum.org], [http://www.r-type.org/exhib/aaq0073.htm r-type.org]</ref>*'''DAC1''' – AM detector diode + AF triode<ref>DAC1 on [https://www.radiomuseum.org/tubes/tube_dac1.html radiomuseum.org], [http://www.r-type.org/exhib/aaa1615.htm r-type.org]</ref>*'''DAF1''' – AM detector diode + AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_daf1.html DAF1 on radiomuseum.org]</ref>*'''DBC31''' – Dual diode + triode<ref>[https://www.radiomuseum.org/tubes/tube_dbc31.html DBC31 on radiomuseum.org]</ref>*'''DC51''' – Triode<ref>[https://www.radiomuseum.org/tubes/tube_dc51.html DC51 on radiomuseum.org]</ref>*'''DCH1''' – Triode/hexode mixer<ref>[https://www.radiomuseum.org/tubes/tube_dch1.html DCH1 on radiomuseum.org]</ref>*'''DCH31''' – Triode/hexode mixer<ref>[https://www.radiomuseum.org/tubes/tube_dch31.html DCH31 on radiomuseum.org]</ref>*'''DF1''' – RF/IF pentode<ref>DF1 on [https://www.radiomuseum.org/tubes/tube_df1.html radiomuseum.org], [http://www.r-type.org/exhib/aag0087.htm r-type.org]</ref>*'''DF31''' – Sharp-cutoff RF/IF/AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_df31.html DF31 on radiomuseum.org]</ref>*'''DF32''' – Sharp-cutoff RF/IF/AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_df32.html DF32 on radiomuseum.org]</ref>*'''DF650''' – Subminiature AF pentode, all-glass elliptical cross-section body, flat 5-pin base, long pigtails, for use in hearing aids<ref>[https://www.radiomuseum.org/tubes/tube_df650.html DF650 on radiomuseum.org]</ref>===='''DFF'''====*'''DFF50''' – Dual pentode<ref>[https://www.radiomuseum.org/tubes/tube_dff50.html DFF50 on radiomuseum.org]</ref>*'''DFF51''' – Dual pentode<ref>[https://www.radiomuseum.org/tubes/tube_dff51.html DFF51 on radiomuseum.org]</ref>*'''DFF101''' – Dual pentode<ref>[https://www.radiomuseum.org/tubes/tube_dff101.html DFF101 on radiomuseum.org]</ref>*'''DK1''' – Octode pentagrid converter<ref>[https://www.radiomuseum.org/tubes/tube_dk1.html DK1 on radiomuseum.org]</ref>*'''DK22''' – Octode pentagrid converter<ref>[https://www.radiomuseum.org/tubes/tube_dk22.html DK22 on radiomuseum.org]</ref>*'''DK31''' – Octode pentagrid converter<ref>[https://www.radiomuseum.org/tubes/tube_dk31.html DK31 on radiomuseum.org]</ref>*'''DL2''' – Power pentode<ref>DL2 on [https://www.radiomuseum.org/tubes/tube_dl2.html radiomuseum.org], [http://www.r-type.org/exhib/aaj0207.htm r-type.org]</ref>*'''DL22''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_dl22.html DL22 on radiomuseum.org]</ref>*'''DL29/3D6''' – Power pentode with a center-tapped, 2.8/1.4 V filament*'''DL31''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_dl31.html DL31 on radiomuseum.org]</ref>*'''DL35''' – 400 mW Power pentode with a center-tapped, 2.8/1.4 V filament*'''DL36''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_dl36.html DL36 on radiomuseum.org]</ref>*'''DL75''' – Subminiature AF power pentode, all-glass round cross-section body, circular 8-pin/pigtails base<ref>DL75 on [https://www.radiomuseum.org/tubes/tube_dl75.html radiomuseum.org], [http://www.r-type.org/exhib/zaa0120.htm r-type.org]</ref>*'''EBF1''' (6B7) – Common cathode dual diode + remote-cutoff RF/IF/AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_ebf1.html EBF1 on radiomuseum.org]</ref>*'''EBF21''' – Common cathode dual diode + remote-cutoff RF/IF/AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_ebf21.html EBF21 on radiomuseum.org]</ref>*'''EBF175''' – Common cathode dual diode + remote-cutoff RF/IF/AF pentode<ref>[https://www.radiomuseum.org/tubes/tube_ebf175.html EBF175 on radiomuseum.org]</ref>*'''EC21''' – Triode<ref>[https://www.radiomuseum.org/tubes/tube_ec21.html EC21 on radiomuseum.org]</ref>*'''EC31''' – Triode<ref>EC31 on [https://www.radiomuseum.org/tubes/tube_ec31.html radiomuseum.org], [http://www.r-type.org/exhib/aaa0776.htm r-type.org]</ref>*'''EC54''' – Triode<ref>[https://www.radiomuseum.org/tubes/tube_ec54.html EC54 on radiomuseum.org]</ref>*'''EC93''' – UHF Medium-mu oscillator triode<ref>[https://www.radiomuseum.org/tubes/tube_ec93.html EC93 on radiomuseum.org]</ref>*'''EC903''' – RF/IF Triode<ref>EC903 on [https://www.radiomuseum.org/tubes/tube_ec903.html radiomuseum.org], [http://www.r-type.org/exhib/aaa0972.htm r.org]</ref>*'''ECC31''' – Common cathode dual AF power triode, octal base<ref>ECC31 on [https://www.radiomuseum.org/tubes/tube_ecc31.html radiomuseum.org], [http://www.r-type.org/exhib/aaa1556.htm r.org]</ref>*'''ECC804/6GA8''' – Separate cathodes, dual triode<ref>[https://www.radiomuseum.org/tubes/tube_ecc804.html ECC804 on radiomuseum.org]</ref>*'''EF21''' – Pentode<ref>[https://www.radiomuseum.org/tubes/tube_ef21.html EF21 on radiomuseum.org]</ref>*'''EF812''' – RF/IF Pentode<ref>[https://www.radiomuseum.org/tubes/tube_ef812.html EF812 on radiomuseum.org]</ref>*'''EF814''' – RF/IF Pentode<ref>[https://www.radiomuseum.org/tubes/tube_ef814.html EF814 on radiomuseum.org]</ref>*'''EFF50''' – Dual VHF pentode<ref>[https://www.radiomuseum.org/tubes/tube_eff50.html EFF50 on radiomuseum.org]</ref>*'''EL20''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el20.html EL20 on radiomuseum.org]</ref>*'''EL22''' – Power pentode<ref>EL22 on [https://www.radiomuseum.org/tubes/tube_el22.html radiomuseum.org], [http://www.r-type.org/exhib/zaa0133.htm r-type.org]</ref>*'''EL30''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el30.html EL30 on radiomuseum.org]</ref>*'''EL39''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el39.html EL39 on radiomuseum.org]</ref>*'''EL43''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el43.html EL43 on radiomuseum.org]</ref>*'''EL53''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el53.html EL53 on radiomuseum.org]</ref>*'''EL54''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el54.html EL54 on radiomuseum.org]</ref>*'''EL70''' – Subminiature power pentode, round cross-section body, circular 8-pin/pigtails base*'''EL820''' – Power pentode<ref>[https://www.radiomuseum.org/tubes/tube_el820.html EL820 on radiomuseum.org]</ref>*'''EM3''' – Top-view, "Magic Eye"-type tuning indicator<ref>[https://www.radiomuseum.org/tubes/tube_em3.html EM3 on radiomuseum.org]</ref>*'''EM31''' – Top-view, "Magic Eye"-type tuning indicator<ref>[https://www.radiomuseum.org/tubes/tube_em31.html EM31 on radiomuseum.org]</ref>{{anchor|EY_SQ}}—''[[#MP_SQ|{{color|Green|Special quality}}]]'':*'''EZ900/6063''' – Full-wave rectifier<ref>[https://www.radiomuseum.org/tubes/tube_ez900.html EZ900 on radiomuseum.org]</ref>*'''GY11''' – Half-wave rectifier, 2.5 V/5 A heater, anode on top cap*'''GY86''' – Half-indirectly heated Half-wave, [[Cathode ray tube|CRT]] [[High voltage|EHT]] rectifier, 2.6 V/300 mA heater, anode on top cap, identical to [[#DY86|{{color|Green|DY86}}]] and EY86 except for heater ratings*'''GY501/3BH2''' – Half-indirectly heated CRT EHT rectifier for color TV, 3.15 V/400 mA heater, anode on top cap*'''GY802''' – Half-indirectly heated CRT EHT rectifier, 2.6 V/310 mA heater, anode on top cap, identical to [[#DY802|{{color|Green|DY802/1BQ2}}]] and EY802 except for heater ratingsThese tubes all have a 5.0 V heater*'''KK1''' – Octode pentagrid converter<ref>[https://www.radiomuseum.org/tubes/tube_kk1.html KK1 on radiomuseum.org]</ref>*'''KLL3''' – Dual power pentode<ref>[https://www.radiomuseum.org/tubes/tube_kll3.html KLL3 on radiomuseum.org]</ref>*'''PCL88''' = '''30PL14''' (EdiSwan) – Triode - power pentode<ref>[https://www.radiomuseum.org/tubes/tube_pcl88.html PCL88 on radiomuseum.org]</ref>*'''PCL800''' = '''30PL13''' (EdiSwan) – Triode - power pentode<ref>PCL800 on [https://www.radiomuseum.org/tubes/tube_pcl800.html radiomuseum.org], [http://www.r-type.org/exhib/aad0301.htm r-type.org]</ref>*'''PY801''' – TV horizontal output booster diode<ref>[https://www.radiomuseum.org/tubes/tube_py801.html PY801 on radiomuseum.org]</ref>*'''UL46''' – Power pentode<ref>UL46 on [https://www.radiomuseum.org/tubes/tube_ul46.html radiomuseum.org], [http://www.r-type.org/exhib/aaa0376.htm r-type.org]</ref>*'''6С51Н''', '''6С52Н''' ⟼ '''6S51N''', '''6S52N''' – ''[[Nuvistor]]'' triodes*'''Н-53''', '''Н-58''' ⟼ '''N-53''', '''N-58''' – ''[[Nuvistor]]'' triodes*'''Н-55''' ⟼ '''N-55''' – ''Nuvistor'' pentode*'''Н-59''' = '''6Э13Н''', '''Н-60''' = '''6Э14Н''' ⟼ '''N-59''' = '''6E13N''', '''N-60''' = '''6E14N''' – ''Nuvistor'' tetrodes*'''ЛП-5''' ⟼ '''LP-5''' – Binary trochotron, 26-pin ''Acorn''-type all-glass pigtaled<ref>{{cite web |url=http://lampes-et-tubes.info/sp/LP-5.pdf |publisher=[[Moscow Electric Lamp Plant|МЭЛЗ/MELZ]] |title=''Бинарный Трохотрон Типа ЛП-5'' data sheet |language=ru |access-date=10 July 2019}} on [http://lampes-et-tubes.info/sp/cd156.php?l=e lampes-et-tubes.info]</ref>*'''ЛП-6''' ⟼ '''LP-6''' – Circular trochotron, 26-pin ''Acorn''-type all-glass pigtaled<ref>{{cite web |url=http://www.155la3.ru/datafiles/lp6_pasp.pdf |publisher=[[Moscow Electric Lamp Plant|МЭЛЗ/MELZ]] |title=''Кольцевой Трохотрон Типа ЛП-4'' data sheet |language=ru |access-date=10 July 2019}}</ref>*'''ЛФ-2''' ⟼ '''LF-2''' – [[Beam deflection tube|Beam deflection]] [[Function generator#Circuit elements|function generator]] tube for use in [[analog computer]]s to calculate {{math|''z'' {{=}} {{sfrac|''x''/''y''|''x''+''y''}}}};<ref>{{cite web |url=http://lampes-et-tubes.info/sc/LF2.pdf |title=ЛФ-2 data sheet |language=ru |access-date=10 July 2019}} on [http://lampes-et-tubes.info/sc/sc021.php?l=e lampes-et-tubes.info]</ref> cf. QK329*'''ЛФ-7''' ⟼ '''LF-7''' – Beam deflection function generator tube for use in analog computers<ref>{{cite web |url=http://lampes-et-tubes.info/sc/LF-7.pdf |title=ЛФ-7 data sheet |language=ru |access-date=10 July 2019}} on [http://lampes-et-tubes.info/sc/sc045.php?l=e lampes-et-tubes.info]</ref>*'''ЛФ-9П''' ⟼ '''LF-9P''' – ''Polytron'', a beam deflection function generator tube for use in analog computers<ref>{{cite web |url=http://lampes-et-tubes.info/sc/LF-9P.pdf |title=ЭЛЕКТРОННОЛУЧЕВОЙ ПРИБОВ ЛФ-9П data sheet |language=ru |access-date=10 July 2019}} on [http://lampes-et-tubes.info/sc/sc046.php?l=e lampes-et-tubes.info]</ref> to integrate up to 10<sup>th</sup> order [[differential equation]]s*'''ЭПЛ-1''' ⟼ '''EPL-1''' – ''Electron bombarded semiconductor tube'', a tube where the anode is replaced by a [[p–n diode|semiconductor diode]] that is reverse-biased and when hit by the electron beam, generates a current;<ref>{{cite web |url=http://www.155la3.ru/datafiles/epl1_tu_1978.pdf |title=''Электронно-полупроводниковая лампа ЭПЛ-1'' data sheet |language=ru |access-date=10 July 2019}}</ref> cf. 7610These tubes were made for [[Vacuum tube battery|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 belowSome 6-prefix tubes were also available as 2-prefix, for television receivers with series heater strings [[#450mA series heater tubes|{{color|Green|(see below)}}]]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 [[#450mA series heater tubes|{{color|Green|(see below)}}]]==='''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 [[#450mA series heater tubes|{{color|Green|(see below)}}]];4 volt DC filament tubes*'''4A6G ''' – Dual power triode, octal base, directly heated with a center-tapped 4.0 V filament, so it can also be wired for 2 VSome 6-prefix tubes were also available as 5-prefix, for television receivers with series heater strings [[#450mA series heater tubes|{{color|Green|(see below)}}]];Rectifiers===Other tubes with nonstandard filament voltages===, split this section into heater current sections, added some heater currents*'''6BK4''' – High voltage beam triode, U<sub>a</sub>=27 kV, I<sub>a</sub>=1.5 mA, P<sub>a</sub>=25 W, U<sub>h-c</sub>=-200 V, used as shunt regulator in color TV receivers and in measurement equipment such as high voltage meters:*'''6BK4A''' – 6BK4 with P<sub>a</sub>=30 W:*'''6BK4B''' – 6BK4A with P<sub>a</sub>=40 W, U<sub>h-c</sub>=-450 V:*'''6BK4C/6EL4A''' – 6BK4B retrofitted with an internal X-radiation shielding, introduced after the [[X-ray tube#Hazards of X-ray production from vacuum tubes|1967 General Electric X-radiation scandal]]<ref name="GEXray" />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 [[All American Five|AA5 radio receivers]];For [[All American Five|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 stringsUsed in ''Three-way portable'' (AC or DC mains, or batteries) radio receivers===100 mA series heater tubes===*'''18FX6''' – [[Pentagrid converter]], 6BE6/EK90 and 12BE6 with a 18 V heater*'''18FY6''' – Dual diode + triode; 6AV6/EBC91 and 12AV6 with a 18 V heater*'''34GD5''' – Beam power tube; 35C5 and 50C5 with a 34 V heater*'''36AM3''' – Half-wave rectifier; 35W4 with a 36 V heater*'''60FX5''' – AF power pentode; 12FX5 and 19FX5 with a 60 V heater===150 mA series heater tubes===Used in [[All American Five|AA5 radios]], and semi-[[Wiktionary:transistorized|transistorized]] TV receivers with [[#Heater or filament ratings|{{color|Green|series heater strings}}]]*'''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===300 mA series heater tubes======450 mA series heater tubes======600 mA series heater tubes===Most are series heater versions of respective 6-prefix tubes; used in TV receivers with [[#Heater or filament ratings|{{color|Green|series heater strings}}]]===Other tubes===*'''13CW4''' – ''[[Nuvistor]]'' High-mu VHF triode (13.5 V/60 mA heater version of the '''6CW4''') for use as a low-noise front end in standalone, semi-[[Wiktionary:transistorized|transistorized]] [[Antenna amplifier|antenna boosters]]; later also used as a [[microphone preamplifier|preamplifier]] in [[Georg Neumann|Neumann]] [[Valve microphone|condenser microphones]] [[U 47|''U-47'' and ''U-48'']] after the production of the [[#VF|{{color|Green|VF14M}}]] ceased*'''{{Visible anchor|DY86}}/1S2''' – Half-indirectly heated 18 kV CRT EHT rectifier, noval base, filament internally connected to cathode. Identical to EY86 and GY86 except for heater ratings*'''{{Visible anchor|DY802}}/1BQ2''' – Half-indirectly heated 23 kV CRT EHT rectifier, noval base, filament internally connected to cathode, identical to EY802 and GY802 except for heater ratings*'''ECF12''' – Triode - Pentode, UCF12 with a different heater*'''GZ40''' – Full-wave rectifier, EZ40 with a different heater*'''UCF12''' – Triode - pentode, ECF12 with a different heater*'''XC95/2ER5''' – [[Control grid#Grid variations|Variable-mu]] VHF triode, identical to EC95/6ER5, PC95/4ER5 except for heater ratings*'''4AP10 ''' – 4" (10 cm) ''[[Direct-view bistable storage tube|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. It therefore needs [[backlight]]ing or external illumination like today's [[electronic paper]]<ref>{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/201/4/4AP10.pdf |publisher=[[RCA]] |title=''4AP10 Skiatron'' data sheet |date=3 November 1944 |access-date=6 June 2019}}</ref>*'''ZA1''' (4 V heater), '''ZA2''' (6.3 V heater) – ''Acorn'' sharp-cutoff pentodess"'''''Bri'''tish '''M'''anufactured '''A'''merican '''R'''adio''" (tubes) used all American designations; [[Standard Telephones and Cables|STC]] used the following system:===Other tubes with nonstandard filament voltages======'''0''' prefix - gas-filled [[cold cathode]] tubes=======[[Voltage-regulator tube|Voltage stabilisers and references]]====:*'''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 volt regulator, Miniature 7-pin base*'''0B2/108C1''' (6627) – 105 volt regulator, Miniature 7-pin base*'''0E3/85A1''' – 85 volt regulator, 3-pin base*'''0G3/85A2''' – 85 volt regulator, Miniature 7-pin base====Trigger tubes====*'''0A5''' – 1 kV, 10 A<sub>peak</sub> Gas triode designed for relay drive and general switching service====Rectifiers====*'''0Z3''' – 30 ≤ I ≤ 75 mA Full-wave gas rectifier, 5-pin base. Used in [[vibrator (electronic)|vibrator]] power supplies in early automobile radio receivers==='''1''' prefix - 1 volt filament/heater tubes=======1.25 volt DC filament subminiature tubes====More of these tubes are listed as equivalents under M-P ''[[#D - 1.4 V filament/heater|{{color|Green|'''D''' - 1.4 V filament/heater}}]]''====1.4 volt DC filament/heater tubes====More of these tubes are listed as equivalents under M-P ''[[#D - 1.4 V filament/heater|{{color|Green|'''D''' - 1.4 V filament/heater}}]]''====2 volt DC filament tubes======='''2''' volt heater/filament tubes=======CRT anode rectifiers====:*'''2X2''' (879) – [[Cathode ray tube|CRT]] [[High voltage|EHT]] rectifier; similar to 1B3 and 1S2 except for heater ratings
::*'''2X2A''' – 2X2, shock resistant up to 250 [[g-force|g]]
===3 volt heater/filament tubes=======2.8 volt DC filament tubes====*'''3A5''' – Dual RF power triode, Miniature 7-pin base*'''3A8GT''' – Diode, triode + pentode with internal shield connected to filament center-tap, octal base*'''3E6''' – Sharp-cutoff pentode with internal shield connected to filament center-tap, Loctal base====CRT anode rectifiers====*'''6GS8''' – Dual-anode pentode for TV receiver sync separation or [[Automatic gain control|AGC]] service
*'''7X6''' – Separate cathodes dual rectifier for use as a [[voltage doubler]]*'''7Y4''' – Full-wave rectifier*'''7Z4''' – Full-wave rectifier*'''14Y4''' – Full-wave rectifier*'''25Z5''' – Separate cathodes dual rectifier for use as a [[voltage doubler]]*'''35W4''' – Half-wave rectifier*'''35Y4''' – Half-wave rectifier with a heater tap for a pilot light, Loctal base; similar to 35Z5*'''35Z3''' – Half-wave rectifier, Loctal base; similar to 35Z4*'''35Z4-GT''' – Half-wave rectifier*'''50DC4''' – Half-wave rectifier, 35W4 with a 50 volt heater*'''50X6''' – Separate cathodes dual rectifier for use as a [[voltage doubler]] (Loctal)*'''117L7GT''' – Half-wave rectifier + beam power pentode*'''117M7GT''' – Half-wave rectifier + beam power pentode*'''117N7GT''' – Half-wave rectifier + beam power pentode*'''117P7GT''' – Half-wave rectifier + beam power pentode*'''117Z3''' – Half-wave rectifier, Miniature 7-pin version of 117Z4GT*'''117Z4GT''' – Half-wave rectifier*'''117Z6GT''' – Separate cathodes dual rectifier for use as a [[voltage doubler]]; some versions have a center-tapped heater that can also be wired for 150 mA/58.5 V*'''38HE7''', '''38HK7''' – ''Compactron'' High-perveance damper diode + horizontal deflection beam power pentode*'''2EG4''' – ''Nuvistor'' high-mu VHF triode, 1.7 volt/600 mA heater*Ultron (MBLE)<sup>([[:fr:MBLE|fr]], [[:nl:Manufacture Belge de Lampes Electriques|nl]])</sup> preceded the M-P designation with the letter '''U''', as in UAD1 for AD1*Gas-filled [[cold cathode]] tubes were shifted to Z before their mass production in Europe started, but before that, most producers published [[#0 prefix - gas-filled cold cathode tubes|{{color|Green|RETMA '''0'''-prefix tube}}]] data appearantly under this letter: OA2, OA3, OB2, OB3, OC2, OC3, OD3, etc.*'''YJ1420''' – 900 W Magnetron for use in domestic [[microwave oven]]s between [[ISM radio band|2.43 and 2.47 GHz]]
*'''YK1220''' – Water-cooled 15 kW UHF linear-beam Klystron for use in TV transmitters between 470 and 860 MHz
*'''YK1230''' – Water-cooled 25 kW UHF linear-beam Klystron for use in TV transmitters between 470 and 860 MHz
# 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. They are usually directly heated to save heating power (therefore requiring a [[Direct current|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 (radio)|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.*'''EAM86/6GX8''' – Diode + side-view, horizontal band-type [[Magic eye tube|tuning/level indicator]] - the diode is to rectify the audio signal when indicating a recording level or a [[Modulation index|modulation depth]]*'''EFM1''' – [[Control grid#Grid variations|Variable-mu]] AF pentode + top-view, "Magic Eye"-type [[Magic eye tube|tuning indicator]], beam control rods internally tied to the floating screen grid on a weak pullup resistor so its voltage mirrors the [[Automatic gain control#AM radio receivers|gain-control voltage]] fed to the control grid together with the audio signal to be amplified*'''EFM11''' – Variable-mu AF pentode + top-view, "Magic Eye"-type tuning indicator, beam control rods internally tied to the floating screen grid:*'''EM84a''' – Improved EM84 with twice the sensitivity<ref>{{cite web |url=http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Mag_Augen/Baender/EM84a.pdf |title= EM84a Data sheet |publisher=[[C. Lorenz AG|Lorenz]] |language=de |access-date=9 April 2019}}</ref>:*'''EM85E''' – Band-type [[drop-in replacement]] for EM85<ref>{{cite web |url=http://www.jogis-roehrenbude.de/Roehren-Geschichtliches/Mag_Augen/Baender/EM85E.htm |title= EM85E on Jogis-Roehrenbude.de |language=de |access-date=9 April 2019}}</ref>*'''ZT1000/8270''' – 21 kV, 10 A [[Thyratron|Mercury-vapor triode thyratron]]*'''EBC81/6BD7A''' – Shielded low-power dual diode + triode, UBC81 with a different heater, EBC41 with a different basing*'''EL511''' – CRT horizontal deflection output power pentode*'''EL519''' – CRT horizontal deflection output power pentode, PL519 with a different heater*'''UBC81''' – Shielded dual diode - AF triode, EBC81/6BD7A with a different heater, UBC41 with a different basing*'''ZM1250''' – Planar, neon-filled, one-character alphanumeric 5×7 dot-matrix display with a left decimal point, 9.8mmCH, all 36 cathodes directly accessibleUsed in 1920s home radios powered by 3.3 Volts DC filament for 3 dry cells with a [[rheostat]] (filaments) and storage batteries (B-plus voltage).*'''PX25''' – Directly heated AF power triode designed in the 1930s. Capable of providing about 25 W of audio.*'''6N6''' – ''[[Triple-twin|Triple-Twin]]'' 4-Watts AF signal + power triode, internally connected as a cathode follower like today's [[Darlington transistor]]s*'''EL505/6KG6''' – CRT horizontal deflection output power pentode for color TV, PL505/40KG6 with a different heater*'''LC900/3HA5''' – VHF triode, identical to EC900/6HA5 and PC900/4HA5 except for heater ratings====With a 4 Volts DC filament====*'''[[Loewe 3NF|3NF]]''' – Tube-based "integrated circuit" with 3 triodes and passive components (audion, AF preamp and power amp) in the same envelope, 4 V/350 mA heater<ref name="LoeweShortForm">[[Loewe (electronics)|Loewe]] [http://lampes-et-tubes.info/rt/LOEWE.pdf short form data listing]</ref> [[File:Commons-logo.svg|16x16px|link=:Commons:Category:3NF|class=noviewer|alt=]]====With a 4V heater====Powered by an AC transformer or a 2-cell [[lead-acid battery]]*'''2HF''' – Tube-based "integrated circuit" with 2 tetrodes and passive components (2-stage RF preamp) in the same envelope<ref name="LoeweShortForm" />*'''2HMD''' – Same with 2 pentodes and passive components (mixer and oscillator), 4 V/1.5 A heater*'''2NF''' – Same with 2 triodes and passive components (AF preamp and power amp), 4 V/600 mA heater*'''3NFW''', '''3NFK''', '''3NFL''' – Same with 4 V/1 A indirect heater (audion, AF preamp and power amp)*'''3NFBat''', '''3NFNet''' – Same with 4 V/125 mA indirect heater (audion, AF preamp and power amp)*'''EN92''' (5696) – 25 mA<sub>avg</sub>, 100 mA<sub>peak</sub>, 2 A<sub>surge</sub>, Gas-filled, indirectly heated tetrode thyratron, negative starter voltage, Miniature 7-pin base, for industrial control*'''HA1''' (4 V heater), '''HA2''' (6.3 V heater) – ''[[Acorn tube|Acorn]]'' UHF triodes up to 600 MHz*'''H12''' – Miniature AF triode for use in hearing aids*'''L12''' – Miniature AF power triode for use in hearing aids=={{anchor|O1915}}List of tubes used in 1910s radio receivers==*'''13П1С, 13П1П''' ⟼ '''13P1S, 13P1P''' – Low (26-110 V) anode voltage audio beam-power tetrode, for use in vehicle equipment#* A notable precursor was 1920's European {{Visible anchor|180mADC}} standard used in municipalities with a then-still commonplace DC mains system, which ruled out not only mains transformers, but also polarized [[Electrolytic capacitor|(electrolytic) capacitors]], as the sets had to tolerate accidental reverse-polarity feeding, making it notoriously difficult to filter out [[dynamo]] or [[Rectifier#Rectifier output smoothing|rectifier]] howl.<ref>{{cite web |url=http://www.radiomuseum.org/forumdata/users/133/ETZ_12_1938_NF_RF_Stoerungen_Gleichrichterspeisung.pdf |title=Zur Frage niederfrequenter Rundfunkstörungen bei Gleichrichterspeisung (On the question of audio frequency interference from a rectifier-based DC mains) |first=Rudolf |last=Moebes |language=de |date=24 March 1938 |publisher=[[:de:Elektrotechnischer Verein|Elektrotechnische Zeitschrift]] |access-date=1 May 2017}}</ref> Compatible product lines include the [[#Mullard designations before 1934|{{color|Green|Mullard x20 series}}]],<ref name="Mullard_MVG_1935" />{{rp|19}} the [[#Mullard–Philips system|{{color|Green|Mullard–Philips}}]] [[#B - 180 mA heater|{{color|Green|B-series}}]], the [[#Philips system before 1934|{{color|Green|Philips B20xx series}}]],<ref name="PhilipsMiniwatt1938" />{{rp|7}} the Telefunken REN(S)18xx series,<ref>Data sheets of [http://www.4tubes.com/1-DATASHEETS/SCANS-Original/R/REN1814_TFK-Nr1_Datasheet.pdf REN1814], [http://www.4tubes.com/1-DATASHEETS/SCANS-Original/R/RENS1820_TFK-Nr1_Datasheet.pdf RENS1820], [http://www.4tubes.com/1-DATASHEETS/SCANS-Original/R/REN1822_TFK_Datasheet.pdf REN1822], [http://www.4tubes.com/1-DATASHEETS/SCANS-Original/R/RENS1884_TFK-Nr1_Datasheet.pdf RENS1884] • Rectifierless [[Tuned radio frequency receiver|TRF]] receiver circuit examples: [http://www.radiomuseum.org/forumdata/users/3741/Seibt_331gi_schema_4_600.png ''331gi''], [http://85.144.192.2/nvhr/Lorenz_K33G.pdf ''K33G''] = [https://www.radiomuseum.org/forumdata/upload/tefag_k133g_schaltplan.png K133G], [http://85.144.192.2/nvhr/Volksontvanger_VE301G.pdf VE301G]</ref> some [[#With an AC/DC series heater|{{color|Green|Loewe WG3x "integrated circuit" tubes}}]], the [[#Tungsram receiving tubes system before 1934|{{color|Green|Tungsram x18 series}}]],<ref name="Tungsram_Lampes" />{{rp|10}} and the [[#Valvo system before 1934|{{color|Green|Valvo x18 series}}]]. Most of these tubes had 20- or 21-Volts heaters; suitable barretters were available.<ref>[http://lampes-et-tubes.info/rl/rl031.php OSRAM 80-240V 0,18A vst dUZ] on lampes-et-tubes</ref>====With a 2.5V heater========With a 6.3V heater========With an AC/DC series heater====*'''MO44''' – Tube-based "integrated circuit" with 2 tetrodes and a capacitor (mixer and oscillator), 35 V/[[#180mADC|{{color|Green|180 mA series heater}}]]<ref name="LoeweShortForm" />*'''WG33''' – Same with 2 triodes, 1 power tetrode and passive components (audion, AF preamp and power amp) in the same envelope, 50 V/180 mA series heater, 9+3-pin base with three top caps*'''WG34''' – Same with 1 pentode, 1 power tetrode and passive components (audion, AF preamp and power amp), 50 V/180 mA series heater, 12-pin base*'''WG35''' – Same with 1 pentode, 1 diode, 1 power tetrode and passive components (detector, AF [[Variable-gain amplifier|variable-gain preamp]] and power amp), 63 V/180 mA series heater, 12-pin base with a tetrode grid top cap*'''WG36''' – Same with 1 triode and 2 pentrodes (mixer, oscillator and IF amp), 65 V/180 mA series heater, 12-pin base*'''WG37''' – Same with 1 tetrode, 2 pentodes and passive components (RF preamp, audion and AF power amp), 75 V/180 mA series heater, 12-pin base*'''WG38''' – Same with 2 pentodes and a triode*'''SY''' – [[Standard Telephones and Cables]] Australia branch, Sydney plant (''not'' Sylvania Inc.)*'''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::*0.625 V DC directly heated for [[Nickel–cadmium battery|NiCd battery]], series-heated two-tube designs such as [[hearing aid]]s. If either filament breaks, further draining of all batteries stops<ref>[https://www.radiomuseum.org/images/tubeenvdiag_klein/d_telefunken_df64.png "Akumed Berlin" hearing-aid eyeglasses schematic] • [http://www.dhi-online.de/DhiNeu/14_Bilder/Schaltpl/Omniton_01.gif "Ideal-Werke Omniton" hearing aid schematic]</ref>:— Heated tubes (all heater/filament letters except '''O''' and '''Z''')::{{anchor|Osemi}}— Heater/filament letter '''O''':<ref name="KriTraTaTa1973">{{cite book |author=<!--Staff writer(s); no by-line.--> |title=Kristalldioden- und Transistoren-Taschen-Tabelle |language=de |publisher=[[Franzis Verlag]] |location=Munich |year=1973 |isbn=978-3-7723-5440-3}}</ref>:*'''A''' – Diode::*'''AP''' – [[Photodiode]]::*'''AZ''' – [[Zener diode]]:*'''C''' – Transistor::*'''CP''' – [[Phototransistor]]:*'''D''' – Power transistor:*'''RP''' – [[Photoresistor]]:*'''Y''' – Power diode:— Heater/filament letters '''M''', '''N''', '''O''', '''Q''', and '''S''': Sequentially assigned number:— All other heater/filament letters: Base type*'''A''' – [[Caesium]]-activated [[antimony]] cathode. Used for reflective-mode photocathodes. Response range from [[Ultraviolet|UV]] to visible, peak sensitivity 420 nm. Widely used.*'''C''' – Caesium-on-oxidated-silver cathode, also called '''S1'''. Transmission-mode, sensitive from 300...1200 nm, peak at 800 nm. High dark current; used mainly in near-[[Infrared|IR]], with the photocathode cooled.*'''U''' – Caesium-antimony cathode with a quartz window for UV detection, peak sensitivity 400 nm*'''83A1/7980''' – Voltage reference tube, Miniature 7-pin base*'''150B2/6354''' – Voltage reference tube, Miniature 7-pin base* Mazda-[[:File:Pub Mazda.jpg|CIPEL]], batteries (C<suli><u>ie</u></suli> Industrielle des Piles Électriques)* Mazda-[[Westinghouse Electric (1886)|Westinghouse]], light bulbs* Mazda-[[Toshiba]], light bulbs, coexisted with the [[Mazda|Japanese automaker]] in its early years*'''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*'''SRS4453''' – Pulse version of the SRS4451*'''SRV355''' – Vapor-cooled triode up to 30 MHz, 50 kW*'''SRW353''' – Water-cooled tetrode up to 220 MHz, 15 kW*'''RA025B''' – 20 kV, 250 mA Half-wave rectifier with an E40 Goliath Edison lamp screw base and an anode screw top cap*'''RA05A''' – 25 kV, 700 mA Half-wave rectifier with an E40 Goliath Edison lamp screw base and an anode screw top cap*'''RA7YB''' – 25 kV, 7 A Half-wave rectifier*'''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*'''RE1000F''' – Radiation-cooled beam tetrode up to 150 MHz, 1 kW*'''RE041XL''' – Forced-air cooled beam tetrode up to 250 MHz, 500 W*'''RE0125XL''' – Forced-air cooled beam tetrode up to 500 MHz, 150 W*'''RE025XA''' – Forced-air cooled beam tetrode up to 500 MHz, 250 W*'''RE1.5XL''' – Forced-air cooled beam tetrode up to 250 MHz, 2 kW*'''RE5XL''' – Forced-air cooled beam tetrode up to 250 MHz, 5 kW*'''UA1A''' – 8 kV, 1 A Half-wave mercury-vapor rectifier with an E40 Goliath Edison lamp screw base and an anode screw top cap*'''UA3A''' – 11 kV, 3 A Half-wave mercury-vapor rectifier with an E40 Goliath Edison lamp screw base and an anode screw top cap*'''6АЖ5 = 6AJ5''' – Low (6.3-80 V) anode voltage, sharp-cutoff pentode*'''ЛП''' ⟼ '''LP''' – [[Trochotron]]*'''6M-DE1''' – Diode + "Magic Eye"-type tuning indicator, Miniature 7-pin base B7G*'''6AJ5''' – Low (6.3-80 V) anode voltage, sharp-cutoff pentode*'''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'''*'''6BK7''' – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections; similar to '''6BQ7''', '''6BZ7''', '''6AQ8/ECC85'''*'''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 '''6BK7''', '''6BZ7''', '''6AQ8/ECC85'''*'''6BZ7''' – Dual RF/VHF triode with separate cathodes and an internal shield between the two sections; similar to '''6BK7''', '''6BQ7''', '''6AQ8/ECC85'''*'''6ES8''', ''ECC189'' – Dual triode used as [[cascode]] RF amplifier in TV tuners and VHF receiver front ends, also used as general-purpose dual triode in test gear; similar to 6DJ8*'''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*'''6694''', '''6957''', '''7412''', '''7536''', '''7633/ORP11''', '''8217''', '''8474''', '''8475''', '''8476''', '''8477''', '''8478''', '''8582''' – [[Cadmium sulfide|CdS]] [[photoresistor]]s (LDR)*'''6762''' – ''Wamoscope'' ("'''Wa'''ve '''mo'''dulated oscillo'''scope'''"), a [[Traveling-wave tube|TWT]]/[[Cathode ray tube|CRT]] combination used to directly visualize an incoming microwave signal by electron velocity-sorting<ref>{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/201/6/6762.pdf |publisher=[[Sylvania Electric Products]] |title=''6762 Wamoscope'' data sheet |date=17 January 1957 |access-date=1 May 2017}}</ref>*'''6922''' (''E88CC'') – Dual triode used as cascode RF 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.*'''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*'''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*'''7846''' – [[Cadmium selenide|CdSe]] [[infrared]] (500...900 nm) [[photoresistor]], 2-pin all-glass pigtailed*'''8032A''' ('''6883B''', '''8552''' – 13.5V heater), '''8298A''' ('''6146B''' – 60 MHz, 120 W Power AF/RF/VHF beam pentode*'''EA76''' (6489) – Diode, all-glass round cross-section body, circular 5-pin/pigtails base*'''EA766''' (5704)(5704) – Diode, 5-pin all-glass pigtailed*'''EB41''' – Low-power dual diode, UB41 with a different heater*'''EBC41''' – Shielded low-power dual diode + triode, UBC41 with a different heater, EBC81/6BD7A with a different basing*'''EBF83/6DR8''' – 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*'''ECC89/6FC7''' – Dual triode used as cascode RF amplifier in TV tuners and VHF receiver front ends, or as general-purpose [[instrumentation]] dual triode, 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*'''ECH43''' – Remote-cutoff triode/hexode oscillator/mixer, low-microphonics version of ECH42; UCH43 with a different heater*'''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<ref>ECLL800 [http://www.mif.pg.gda.pl/homepages/frank/sheets/062/e/ECLL800.pdf data sheet] • [http://www.4tubes.com/2-SCHEMATICS/BY-TUBES/ECLL800/ECLL800-Schaltung.jpg circuit]</ref>*'''E80F/6084''' – AF or [[electrometer]] pentode, gold-plated pins*'''EFP60''' – Secondary emission wide band pentode for TV amplifiers*'''EL31''' – Power pentode very similar to EL38/6CN6*'''EL300/6FN5''' – CRT horizontal deflection power pentode, octal base, identical to PL300/35FN5 except for heater ratings*'''EL844''' – RF power pentode*'''{{Visible anchor|EY80}}''' – TV horizontal output booster diode, identical to PY80 except for heater ratings*'''MC1''' = '''RL2T15''' – AF triode for use in audions<ref name="MC1">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/043/m/MC1.pdf |title=''MC1 Triode für Niederfrequenz und Audion'' data sheet |language=de |publisher=[[Telefunken]] |access-date=4 January 2014}}</ref><ref name="TFK-Catalog_Datasheet">{{cite web |url=http://www.4tubes.com/1-DATASHEETS/SCANS-Original/S-T-U/TFK-Catalog_Datasheet.pdf |title=''Telefunken catalogue'' |language=de |publisher=[[Telefunken]] |access-date=1 May 2017}}</ref><ref name="Bogner2002">{{cite web |url=https://www.radiomuseum.org/forumdata/users/5100/Entwicklung_des_UKW_Teil6_Folge6_v11.pdf |author=Gerhard Bogner |title=Funkgeschichte 144: Entwicklung des UKW-Rundfunks, Teil 6: Zeitraum 1934 -1940, Folge 6: Spezial- und Wehrmachts-Röhren, UKW-Röhren (RadioHistory 144: Developing VHF radio, part 6: Period 1934-1940, subpart 6: Special and Wehrmacht tubes, FM tubes) |language=de |location=Neu-Ulm, Germany |year=2002}}</ref>*'''MF2''' = '''RV2P800''' – RF pentode<ref name="MF2">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/043/m/MF2.pdf |title=''MF2 HF-Pentode'' data sheet |language=de |publisher=[[Telefunken]] |access-date=4 January 2014}}</ref><ref name="TFK-Catalog_Datasheet" /><ref name="Bogner2002" />*'''NF2''' – Sharp-cutoff RF pentode;<ref name="NF2">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/043/n/NF2.pdf |title=''NF2 HF-Pentode'' data sheet |language=de |publisher=[[Telefunken]] |access-date=4 January 2014}}</ref><ref name="TFK-Catalog_Datasheet" /> identical to AF7 and CF7 except for heater ratings, and also produced by [[Japan Radio Company|JRC]] in the then-[[Axis powers|axis power of Japan]]<ref name="戦前の日本独自の特殊管 - 日本無線が作った特殊受信管">{{cite web |url=https://radiomann.sakura.ne.jp/HomePageVT/Radio_tube_22.html#Tab2 |title=戦前の日本独自の特殊管 - 日本無線が作った特殊受信管 (Japan Oriented Special Tubes before WWII - Special Receiving Tubes manifactured by Japan Radio Corp.) |first1=Koji |last1=HAYASHI |first2=Ibaraki |last2=JAPAN |language=ja}}</ref>*'''NF6''' = '''RV12P2000''' – RF pentode<ref>[https://www.radiomuseum.org/tubes/tube_nf6.html NF6 on radiomuseum.org]</ref><ref name="Bogner2002" />; also produced by JRC in Japan<ref name="戦前の日本独自の特殊管 - 日本無線が作った特殊受信管" />*'''PF83''' – AF remote-cutoff pentode for use as a [[Variable-gain amplifier|VCA]] in remotely controllable TV receivers*'''PF86''' – AF Pentode, also for use in ''[[Dynatron oscillator|Transitron]]'' circuits in TV receivers. Identical to EF86/6BK8 and UF86 except for heater ratings*'''PL81/21A6''' – AF, or CRT horizontal deflection output power pentode*'''PL82/16A5''' – AF, or CRT vertical deflection output power pentode*'''PL300/35FN5''' – CRT horizontal deflection power pentode, octal base, identical to EL300/6FN5 except for heater ratings*'''PL505/40KG6''' – CRT horizontal deflection output power pentode for color TV, EL505/6KG6 with a different heater*'''PL509/40KG6A''' – PL505/40KG6 with an increased max. anode dissipation, EL509/6KG6A with a different heater*'''PM84''' – Side-view, band-type [[Magic eye tube|tuning/level indicator]] for use in TV receivers, UM84/12FG6 with a different heater*'''SD1A''' – Shortwave power triode<ref name="SD1A">{{cite web |url=http://www.mif.pg.gda.pl/homepages/frank/sheets/043/s/SD1A.pdf |title=''SD1A Kurzwellen-Triode'' data sheet |language=de |publisher=[[Telefunken]] |access-date=4 January 2014}}</ref><ref name="TFK-Catalog_Datasheet" /><ref name="Bogner2002" />*'''UBC41''' – Shielded dual diode - AF triode, EBC41 with a different heater, UBC81 with a different basing*'''UCH42/14K7''' – Remote-cutoff triode/hexode oscillator/mixer, Rimlock base, ECH42 with a different heater*'''UCH43''' – Remote-cutoff triode/hexode oscillator/mixer, low-microphonics version of UCH42; ECH43 with a different heater*'''ZZ1030''' (STV500-0,1) – Quad 125 V Voltage references, noval base, used all series-connected to stabilize the [[dynode]] voltages of [[Photomultiplier tube|photomultipliers]]*'''BA9/20 = 7635''' – X-band, 20 mW, Forced-air cooled backward-wave oscillator*'''BA16/10''' = 7636 – Ku band, 10 mW, Backward-wave oscillator*'''DCG4/1000G''' (866A) – Mercury-vapor rectifier*'''DCG5/5000GB''' (872A) – Mercury-vapor rectifier*'''DCG5/5000GS''' (8008A, ZY1001) – Mercury-vapor rectifier*'''DCG6/18''' (6693) – Mercury-vapor rectifier*'''DCG9/20''' (6508) – Mercury-vapor rectifier*'''DCG12/30''' (5870) – 12 kV, 30 A Grid-controlled, half-wave mercury-vapor rectifier with anode top cap*'''DCX4/1000''' (3B28) – 4 kV, 1 kW Half-wave xenon rectifier with anode top cap*'''DCX4/5000''' (4B32) – 4 kV, 5 kW Half-wave xenon rectifier with anode top cap*'''PE1/100''' (6083, YL1200) – 100 W Shortwave pentode*'''QB2/250''' (813) – Beam tetrode*'''QB3/300''' (6155, 4D21, 4-125A) – Beam tetrode*'''QB3.5/750''' (6156, 5D22, 4-250A) – Beam tetrode*'''QB4/1100''' (7527) – Beam tetrode*'''QB5/1750''' (6179) – Beam tetrode*'''QBL4/800''' (4X500A) – Forced-air cooled 800 W beam-tetrode*'''QBL5/3500''' (6076) – Forced-air cooled 3500 W beam-tetrode*'''QBW5/3500''' (6075) – Water-cooled 3500 W beam-tetrode*'''QC05/35''' (8042) – 35 kW Beam-tetrode*'''QE06/50''' (807) – 50 W Radiation-cooled output beam-tetrode*'''QE08/200''' (7378) – 200 W Beam-tetrode*'''QEL1/150''' (4X150A, 7034) – Forced-air cooled 150 W beam-tetrode*'''QQC03/14''' (7983) – 14 W Dual beam-tetrode*'''QQC04/15''' (5895) – Dual beam-tetrode*'''QQE04/20''' (832A) – Dual beam-tetrode*'''TB3/750''' (5867) – Radiation-cooled power triode*'''TB4/1250''' (5868) – Radiation-cooled power triode*'''TB5/2500''' (7092) – 5 kV, 2.5 kW Radiation-cooled power triode*'''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*'''TBL12/38''' (7806) – Forced air-cooled power triode*'''TBL12/100''' (6078) – Forced air-cooled power triode*'''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*'''TBW12/38''' (7807) – Water-cooled power triode*'''TBW12/100''' (6077) – Water-cooled power triode*'''XR1/1600A''' (8063) – Improved XR1/1600*'''XR1/3200A''' (7981) – 1.5 kV, 40 A Inert gas-filled triode thyratron with anode top cap*'''DDR100 – 100 g max., 250 Hz max., Mechanotron-type 1-axis accelerometer[[Siemens Building Technologies#History|Cerberus]]:*'''E''' – Early directly heated triode derived from the French TM tube*'''ECT100''' – 1 MHz, top-viewing, bidirectional, decade Dekatron<ref name="ECT100">{{cite web |url=http://www.tube-tester.com/sites/nixie/dat_arch/EZ10B_ECT100.pdf |title=Elesta application manual |language=de |publisher=Elesta |access-date=1 May 2018}}</ref>*'''EZ10B''' – 1 MHz max. Decade Counter/Selector Dekatron<ref name="EZ10">{{cite web |url=http://www.tube-tester.com/sites/nixie/dat_arch/EZ10.pdf |title=''Technische Mitteilungen - Neuentwicklungen im Röhrenbau'' application note |language=de |publisher=Elesta |date=March 1958 |access-date=1 May 2018}}</ref><ref name="EZ10B">{{cite web |url=http://www.tube-tester.com/sites/nixie/dat_arch/EZ10A_EZ10B.pdf |title=''Technische Mitteilungen - Die Dekadenzählröhre EZ10B'' application note |language=de |publisher=Elesta |date=February 1961 |access-date=1 May 2018}}</ref>[[Electro-Harmonix]]:*'''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*'''329''' – 1.15 A, Dual (5...15 and 10...30 V) ballast tube for use with the 328 Tungar bulb*'''451''' – Full-wave, argon-filled Tungar bulb, a low-voltage rectifier for charging 6V lead-acid batteries at 1.3 A*'''452''' – 1.15 A, Dual (3.5...10 and 7...20 V) ballast tube for use with the 451 Tungar bulb<ref>Valvo Taschenbuch 1962</ref>*'''5BP1''' (1802-P1) – 5" CRT for use in pre-World War II oscilloscopes. Electrostatic deflection, P1 green, short-persistence phosphor<ref name="5BP">http://www.mif.pg.gda.pl/homepages/frank/sheets/121/5/5BP1.pdf</ref>*'''5BP3''' (1802-P3) – Pre-World War II, 5" CRT, electrostatic deflection, P3 yellow, medium-persistence phosphor<ref name="5BP" />*'''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.<ref>https://www.crtsite.com/tv-crt.html</ref> Electrostatic deflection, P4 white, medium-persistence phosphor.<ref name="5BP" />*'''5BP11A''' – 5" CRT, electrostatic deflection, P11 blue, short-persistence phosphor<ref>http://www.mif.pg.gda.pl/homepages/frank/sheets/041/5/5BP1A.pdf</ref>*'''920''' – Dual gas-filled phototube, caesium-coated cathode with spectral S1 response (red/infrared, maximum sensitivity at 750 nm), 4-pin base, for use in a differential circuit to read variable-area film soundtracks*'''931''' – First mass-produced [[Photomultiplier tube|photomultiplier]], 9-stage, spectral S4 response, 11-pin base, still in production today*'''5Ц3С''' ⟼ '''5C3S''' – Full-wave rectifier [[File:Commons-logo.svg|16x16px|link=:Commons:Category:5Ts3S|class=noviewer|alt=]]*'''6Н8С''' ⟼ '''6N8S''' (6SN7/ECC33) – Separate cathodes, high-mu dual triode for use as a flip-flop in early Soviet computers such as Урал-1 and Урал-2, octal base<ref>[http://www.mif.pg.gda.pl/homepages/frank/sheets/113/6/6N8S.pdf 6N8S/6Н8С data sheet] • [http://www.computer-museum.ru/english/ural_1.php Урал-1] • [http://www.computer-museum.ru/english/ural_2.php Урал-2]</ref>*'''6П45С''' ⟼ '''6P45S''' – Beam-power tetrode [[File:Commons-logo.svg|16x16px|link=:Commons:Category:6P45S|class=noviewer|alt=]]*'''6С33С''' ⟼ '''6S33S''' – Power triode [[File:Commons-logo.svg|16x16px|link=:Commons:Category:6S33S|class=noviewer|alt=]]*'''6МУХ6П''' ⟼ '''6MUH1P''' – Mechanotron-type rotation sensor; a vacuum dual diode with one anode mounted on a shaft that extends through a vacuum-tight bearing*'''6МН1Б''' ⟼ '''6MN1B''' – Mechanotron-type displacement sensor; a vacuum dual triode with one anode mounted on a shaft that extends through a diaphragm*'''2XM400''' – Directly-heated, 4 kV/400 mA half-wave rectifier, 4 V/2.35 A heater—Rejected for various reasons:
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