List of historic valves in the ase-museoedelpro collection
 
Here is a list of some historic valves in the collection, including a survey of early valves, up to mid 1930s, power and transmitting tubes, VHF and UHF types, tubes designed for radar application and several very early prototypes designed and built during the radar development in England, Germany and in the US: magnetrons, klystrons, and conventional gridded types. There are also more recent types added because of their operating principles or even because they are evolutions of early types.
The ASE-Museoedelpro collection includes several hundred types of valves. This is only a partial list that will be updated as other valves cards are ready.
Some links could still left open, please access from the Virtual Museum selection. *** Last update: March 2026.
1B42 Mercury spark gap, radar pulse modulator. Western Electric Mercury pool was used to continually renew the surface of the negative electrode.
200 A at 6 µs pulses.
Description in the BSTJ Vol. 25, Oct. 1946 and in Glasoe, Pulse Generators, Rad Lab Series, 
 
2H21 Phasitron' FM modulator, General Electric, 1950s. Also available the 5593, different parameters.
 
2J21 / 2J21A Magnetron, very early unstrapped X-band, 1941. Westinghouse. Rare, superseded from 1942 by the WE 725A.
 
2J22 ÷ 2J29 Family of S-band magnetrons. 250 kW typical pulses
 
2J36 12-vane X-band magnetron. Still unstrapped, it was released early in 1942, being registered to Raytheon only after the war, in October 1945. Used in the AN/MPN-1 ground controlled precision approach radar system.
 
2J38 / 2J39 Fixed frequency low power magnetrons operating at 3.300 MHz. Integral magnet. Coaxial output.Registered to Raytheon in October 1945, RMA record 445.
 
2J51A Packaged magnetron, mechanically tunable from 8.5 to 9.6 GHz. 20 to 70 kW peak power by moving one to four magnetic shunts. Western Electric. Full description given in 1946 in the Bell System Technical Journal.
 
2J55 / 2J56 Fixed frequency variants of the packaged 2J51A    
2J61(A)/ 2J62(A) Mechanically tunable S-band magnetrons with overlapping frequency coverage. Designed to replace the family of fixed frequency types 706AY to 706GY.
Registered to Raytheon in October 1945, RMA record No. 445.
 
2K33 (A,B) Raytheon K-band reflex klystron. Derived from early prototypes of VX302 developed in UK at the Clarendon Laboratory from 1941. In the UK the devvelopment of the 24 GHz radar was abandoned due to the excessive attenuation caused by water vapor.
 
2K50 K-band reflex klystron developed in 1944 by Western Electric. Thermally tuned by electronic bombardment. Waveguide flange.
 
3B600 Power triode intended for electro-medical applications. Fivre
 
3C27(B)/3C37 UHF power triode, National Union proposed its own variants of the British milli-micropup family. Flying wires replaced by coaxial connector and in the 3C37 a finned radiator was added to the grid rod, for better pulse operation when the grid was heavily d
 
3C33 Twin power triode, 829/3E29 format
3C33_02_res.jpg
 
3F3-TRX Forced-air cooledn 3 kW transmitting triode. Fivre
 
3F6-TRX 6 kW forced-air-cooled transmitting triode
3F6TRX_01eres.jpg
 
3F20-TA Transmitting triode, external radiator or water jacket.  22 kW. Fivre
 
3F22-TA Transmitting triode, compact folded anode variant of the 3F20-TA. Fivre 
 
3J22 Small interdigital magnetron by Sylvania
3J22-pic-res.jpg
 
4C27 UHF transmitting triode, 'micropup' style. U.S. equivalent to British CV92, CV199, NT99 and to Canadian REL 7
 
4C28 UHF transmitting triode, 'micropup' style. RCA variant of the 4C27, for the SHORAN navigation system. 
 
4C29 UHF transmitting triode, 'micropup' style. Flying leads replaced by a coaxial connector. Registered in the U.S. by Canadian REL. Manufactured by Canadian Rogers and by Central Sales in the U.S.
 
4J52 (A) Packaged X-band magnetron. RMA registration reserved to Western Electric in November 1944, registered only after the war, in October 1948. RMA record No. 703.     
4J57 Packaged magnetron operating in the C-band. 250 kW. Registered to Raytheon in 1946.
 
5J26 600 kW magnetron, mechanically tunable from 1.220 to 1.350 MHz. Intended to replate the entire family of fixed frequency types from 4J21 to 4J30. Western Electric during WWII
 
5J29 Split anode CW magnetron, liquid cooled. General Electric developmental code ZP579. It was designed to operate from 350 to 770 MHz in the radar jammer AN/APT-4
 
5J30 Split anode CW magnetron, liquid cooled. General Electric developmental code ZP590. It was designed to operate from 150 to 385 MHz in the radar jammer AN/APT-4.
 
5J32 Split anode CW magnetron, liquid cooled. Coaxial copper tubes for liquid cooling of the anode blocks. General Electric. It was designed to operate from 350 to 750 MHz in the radar jammer AN/APT-4.
 
5J33 Split anode CW magnetron, liquid cooled. Three anode segments, the central one connected to the mid point of the line.  General Electric. It was designed to operate from 750 to 1.150 MHz in the radar jammer AN/APT-4.
 
6C21 Eimac power triode derived from the 1000T.Intended as power pulse modulator
 
8P1 Ultra hi-rel pentode designed by British GPO to operate in submarine cable repeaters, system life expectancy exceeding 20 years.  Quite late, 1962, and extremely rare.
Only evaluation prototypes made before submarine cables were replaced by communication 
*****
10AL1 Reflex klystron, British early experimental prototype in order to improve the 'Sutton tube'. It shows a flat repeller, such as in the WE 707A and close interaction with the electron beam by means of meshes of molybdenum ribbon on the resonator ends. This solution will be later adopted in the new S-band klystron family, as in the CV238.
Second half of 1941. 
*****
10E501 / CV11 Early reflex klystron, designed by Robert Sutton in 1940 as local oscillator for microwave radar receivers. Also known as 'Sutton tube'. The collection also includes an unbased prototype.
This and the unbased one are the only known samples of the original 'Sutton tube'.
** September 1940 onwards.
*****
35T- Vacuum Gauge Eimac ionization vacuum gauge, derived from 35T transmitting triode. Likely used in the evacuation system of the 'resnatron' 1 MW tetrode.
 
53A Eimac VHF transmitting triode. Smaller than other similar triodes, 227, 327 and VT-127.Probably used in the transmitter of ASB airborne radar
 
175HQ Ultra high rel amplifier for submarine cables designed by Bell Telephone. Used in the Avana-Key West and in the TAT-1 transatlantic cables. Designed for system life exceeding 20 years!
June 1941 onwards.
***Extremely rare
*****
356A / 356B VHF power triode, derived from the 100TH. Used in the modulator of the early CXAS radar. The gridless variant was proposed as 705A, high-voltage rectifier. Western Electric and British STC.
 
357A / 357B VHF transmitting triode. Western Electric and later Machlett
 
364A VHF all-glass transmitting triode. Western Electric. Pre-WWII, used in WE radio links.
According to Ludwell Sibley, used since 1939 in the Massachusetts coasts to Cape Charles and later in the Cheasepeak Bay radio links.
*** Very rare
 
402A Early Western Electric linear-beam klystron amplifier. This is the only one gone into small production of the many experimental types made at Bell Labs around 1940.*Rare!
 
410 Westinghouse Early power klystron developed by the Varian brothers and gone into limited production in the US around 1940. 10 W out at 3 GHz. Complete with Type 10 tuner.
** Very rare!
*****
455A Ultra high-rel amplifier for submarine cables. Designed to operate 20 years with no failure, in order to replace the 175HQ for the new SD transoceanic system. The tubes were built by Weswtern Electric.
Each tube was aged for 5.000 hours.
**** Extremely rare! 
*****
527A / PL-185 VHF power triode used as radar oscillator or modulator. Four tubes in the ring oscillator of SK-1M set gave 1 MW at 225 MHz. Eimac was second sourced by Penta Labs with its code PL-185.
 
700B The 700A-D were the first cavity magnetrons designed by Westren Electric after the Tizard Mission revealed progress with the E1189 magnetron. Early 1941. *** Very rare!
*****
701A Power tetrode proposed as pulse modulator. Large glass bulb containing four electrode sets of the 350A with common molybdenum plate. Western Electric, 1941
 
706A-C (Y)
Early Western Electric family of S-band magnetrons. Introduced only after the six-cavity 700, the unstrapped 706 was available in three frequency variants, A to C.The strapped version, Y suffix, included more frequency variants, from A to G. 
 
714A(Y) Western Electric early magnetron, similar to 706A but t operating at 3.300 MHz. 
 
720CY 1 MW S-band WE magnetron. To increase the emission, the cathode and obviously the anode length were doubled with respect to the dimension of the 714 family
 
723A (A/B) In the US the design of the 723A (in the photo), the first reflex klystron for the receiver of the X-band radar, started at WE in the first half of 1941. The resonator was moved into the evacuated metal envelope and the tuning was possible from the outsid
 
725A The X-band strapped magnetron 725A was designed at Western Electric to replace the 2J21. During WWII its production exceeded 250.000 units, more than 90.000 of which supplied to the British Empire under the Lend-Lease law. 
 
728AY...DY 200 kW UHF magnetron family, A to D suffixes covering from 900 to 970 MHz.
 
730A The Western Electric 730A was similar to the 725A above, with the WG flange rotated 90 degrees.    
880 / GL-880 Folded anode 20 kW transmitting triode requiring external water jacket. The very compact arrangement of the electrodes also offers improved frequency performance.
An excellent demonstrator of glass-to-copper welding technology.
 
891 / 891R The rated power of the water-cooled 891 triode was 7 kW. The  891R with finned radiator was rated at 4 kW with forced-air cooling.
*** This sample, made by Italian Fivre, survived the shipping to us despite its mass of over 20 kg.***
 
3036D LMT UHF retarding-field triode for Barkhausen-Kurz oscillator. Early in the 1930s this was the simplest way to generate frequencies above 100 MHz. Unfortunately the obtainable power was very low, in the order of a few milliwatts.
 
4316A British STC equivalent for the WE 316A 'doorknob' style UHF triode. The 316A was used in the early eperiments of AI radar, as reported by Bowen. Due to the complex manufacturing process and to the introduction of better performing types by GEC, in England
 
5531 Transmitting power triode, forced-air cooled. 10 kW power dissipation. Registered to Western Electric in february 1949, RMA release 734.
 
5586 Pulse magnetron tunable from 2.7 to 2.9 GHz. Replaced the family of fixed frequency types 4J31 to 4J35. 800 kW typical output power. 
 
5593 General Electric 'Phasitron' FM modulator tube. The principle was first introduced by Robert Adler at Zenth Radio in January 1946. Similar to GE 2H21, different operating parameters. 
 
5668 20 kW water-cooled transmitting triode
5668_3.jpg
 
5674 / FP-54 Twin electrometer tetrode, General Electric
5674-GL_2res.jpg
 
5680 / 7C23 2.5 kW power triode, finned radiator also intended for pulsed operation with 35 A peak emission.  
 
5734 RCA 'Vibrotron', vibration sensor. Also proposed as active phono pick-up
5734_b_enh_r.jpg
 
6076 3 kW forced-air cooled transmitting tetrode. RMA registration code for Philips QBL5/3500. 
6076_1eres.jpg
 
6090 Electrostatic beam switch multiplexer. National Union 
 
6230 / QK299A  Mechanically tunable magnetron, integral magnet, wg out. Used in the active guidance of the Nike-Ajax and in the AN/UPW-1 X-band data link. Raytheon. 
 
6324 25-line magnetically focused beam switch/multiplexer. National Union
*Measurements, rare!
 
6344A / QK235  Tunable magnetron, integral magnet. 260 kW typical from 5.450 to 5.825 MHz. 
 
6410 / QK338  High power packaged magnetron. 5 MW pulses at 2.750 to 2.860 MHz. This sample, still in its factory shipping crate, was manufactured by ElTel. 
 
6896 / 1855  RCA 'Graphecon' scan converter tube. Dual gun tube, basically designed to convert ppi images in a format compatible with raster video monitors 
 
6961 / CV5239 6 kW forced-air cooled transmitting triode. Equiv. to Philips TBL7/8000
6961_03e-res.jpg
 
7003 / ML-7003 Screened control grid power triode intended to operate as pulse modulator up to 2 MW. Grid wires are protected from direct strikes of electrons when grid is heavily driven positive during pulses. 
 
7503 Low power X-band magnetron for beacon application. 200 W peak output power. 
 
7883 / BR-169C External anode power triode for audio modulators. Anede dissipation up to 1 kW by convection or up to 1.5 kW by forced-air
7883_04e-res.jpg
 
8002R Forced-air cooled power triode, finned radiator.
1.2 kW power dissipation
8002R_05-res.jpg
 
A-103A Experimental split-anode magnetron w/internal loop, probably proposed by RCA in 1941 to operate as local oscillator at 3 GHz.  Later registered as 3J35, no known use.
 
A1396B RCA experimental beam-deflection amplifier, probably made in the development of the 1636 UHF mixer Experimental, very rare!
 
ACT25 / CV436 In 1943 GEC introduced the CV288 triode for CW and pulse operation up to 600 MHz. After the war the design was proposed again in the ACT25 wide band UHF power amplifier
 
AS1010 AEG German WWII UHF high-power twin triode for pulse operation.
*** Extremely rare! ***
 
AT50 50W 'Three-foot' style early transmitting triode. Early 1920s
 
AV1015 Power triode, pulse modulator
 
C100A Quite unique external-grid oscillator designed by Amperex for Collins around the mid thirties. This kind of non-conventional oscillator had been patented in 1915 by Dr. Robert Goddard, the scientist known for his works on rockets.
 
C100D Negative resistance oscillator, designed by Amperex for Collins as improved variant of the C100A
 
C31007C13 RCA experimental 10-stage photomultiplier. No data
 
Catkin-Prototype GEC experimental 'Catkin' prototype with radiator. Derived fro the CAT transmitting power tubes, the smaller Catkin family retained the external copper anode sealed to the bottom glass bulb
 
CG-1162 / VT-14 General Electric pliotron, early transmitting triode, introduced during the Great War. Two variants available with two or with four plate supporting strips.
 
CIG22 Cold cathode 'Penning' vacuum sensor
Philips
CIG22_3-res.jpg
 
CK1300 Pirani vacuum gauge
CK1300_RAY_arr.jpg
 
CV8 / E1248 Coaxial diode, micropup style, designed to operate as T/R switch in the duplexer of the Naval Type 270B radar. GEC, 1941
 
CV14 Silica' transmitting triode designed to operate in VHF RDF sets. Operation proved to be marginal above 150 MHz and micropup triodes were preferred
About 1941. *** Rare
 
CV15 Micropup' style transmitting triode, conduction-cooled. Intended to operate in the VHF region, up to 300 MHz
 
CV22 Mercury thyratron designed for high-power pulser, 50 A at 20 kV. BTH
 
CV55 / CV155 / CV178 Milli-micropup power triodes, useful for CW or pulsed operation up to 1.200 MHz. In radar applications two CV155s generated 40 kW pulses at 1.200 MHz. Developed at GEC from the late 1939 to 1940.
 
CV56(*) Early strapped variant of NT98, used among the others in the Type 271Q Naval radar. Soon later supplied in four frequency variants, A to D suffixes from the 1943 production. Frequency variants available, idntified for their suffix A to D. 
 
CV58 / CV258 Planar diode, UHF mixer
 
CV64 Strapped variant of the E1198/CV38 magnetron. Developed by BTH, it was used in the H2S transmitter. See also the Canadian REL 3C and the German copy LMS 10.
 
CV69 The first strapped cavity magnetron capable of operation at 1 MW input power. Used in the Type 271 Naval radar set. CV69A to D were later relisted as CV1475, CV1476, CV1477 and CV 1478
 
CV76 High power variant of CV56 operating with higher magnetic field. 25 kV at 40A input pulses. Used since early 1943 in the Type 277 early warning radar.
 
CV87 / KRN2 Early X-band reflex klystron using the harmonic resonator proposed by Blumlein at EMI in close collaboration with the Clarendon Laboratory. First samples were available by March 1941. 
 
CV94 / DS103 Coaxial diode, T/R switch, probably designed to replace the CV8. Used in the Naval Type 960 radar, 450 kW. 100 A peak cathode emission. About 1945.
 
CV109 / 9PK5 First British power klystron, Only few experimental samples made in 1940, being outperformed by the E1189 cavity magnetron. 150 W at 10 cm.
*** Extremely rare!!!
*****
CV150 / PK150 10 cm power klystron designed by EMI in 1941 for the transmitter TR 3539 for airborne radar set. 30 kW peak power. The design of this klystron was requested by Winston Churchill himself for the radar sets of aircraft on missions on the continent, thus preventing the enemy could capture the cavity magnetron.
*** Exremely rare!!!
*****
CV160 1 MW S-band high power magnetron. Coaxial output. 1944
 
CV192 High-power variant of the CV64, to be used in pressurized execution of the H2S airborne radar. Conduction cooled from the heavy metal block.
 
CV208 / E1487 GEC early strapped X-band magnetron The collection includes two samples, one with wg adapter/mount and duoble heater stem, the second one with single stem.