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List of E-number (experimental) valves

^M ^M ^M
E2 Rectifier
E10 Modified R valve
E25 Tungsten anode tx valve
E35 Tubular dull emitter valve
E44 Modified MT5 tx valve
E50 Special V24 with 6 turns per cm. grid
E77 DE3 in miniature bulb
E102 DE5 type
E116 Very low impedance LS5A
E118 DET1 with heavy grid and anode leads
E129 Modified FE1 valve with very fine grid wires
E130 Audion type valve made for Marconi Co.
E132 Triode (CV1643)
E133 Triode (CV1645)
E164 5-electrode valve with 625 barium filament
E196A Early magnetron
E233 Modified D8
E235 Mercury rectifier
E242 Trial H210 with stranded filament supports to combat microphony
E272 CAT6 with a large anode
E334 PX4 with oxide coated filament
E356 Copper anode triode
E366 Oxide coated DA100
E395 MS4 with mercury vapour filling
E414 DEV with 1V filament
E434 VMS4B
E458 H2 double diode
E504 Helium filled EHT rectifier
E521 ACT22
E574 High slope PX25
E632 Oxide PX4
E675 ACT9 for ultra short waves
E686 Acorn pentode
E704 Modified W31
E742 Valve similar to 304A tx valve
E744 Y63
E748 D42
E759 N66
E770 ACT10 (air cooled CAT15)
E852 W63
E862 KT66 on a 5 pin base
E872 NT65 (Navy version of PT5)
E880 NT75 4-segment glass magnetron
E897 Tetrode (1)
E905 MHD4 special made for Cambridge Instruments
E936 Z62 (1)
E942 ACT14 (air cooled CAT6)
E960 VT58
E960T VT98
E972 DET19
E997 E936 with a ceramic bases (1)
E1001 Experimental acorn triode
E1007 Triode (258T)
E1011 Experimental micropup, developed into E1046? (2)
E1013 WE 212E
E1024 VT114 copper-glass tx tetrode (CV1114)
E1039 Attempt at glass version of NT60
E1046 VT90 (CV62) (or CV219?)
E1046A ? (also copied by RCA as A2137) (2)
E1046B ? (also copied by RCA as A2137A)(2)
E1046D See E1166 (2)
E1061 Mentioned in A Scientists War as not traced
E1097 (CV1111)
E1107 Beam deflection VHF valve (1)
E1130 Millimicropup, 1kW pulse at 1GHz (2)
E1132 (CV1111)
E1143 (CV1577)
E1148 CV6
E1149 Glass-metal triode (Scientists War - not traced)
E1155 NT100 (CV44)
E1161 Triode (CV1253)
E1164 (CV1091)
E1166 E1046D, second enlargement of micropup
E1180 (CV1077)
E1188 Experimental cavity magnetron
E1189 NT98
E1190 Millimicropup (CV55 and CV155)
E1191 CV12
E1192 Beam tetrode (VT501)
E1198 CV38
E1199 Peak voltmeter diode (CV1405)
E1209 (CV7) small gas triode
E1210 Glass magnetron for RX use, 9.1cm
E1228 Rugged miniature wire-ended thyratron (CV3?)
E1229 (CV4)
E1231 (CV52) concentric triode oscillator
E1232 NT99
E1233 Magnetron, 10cm, 50 to 100kW
E1234 Oxide coated cathode VT90 (E1046) (2)
E1235 Triode (CV1580 or CV29?)
E1236 (CV69)
E1239 Micropup, largest, oxide coated cathode
E1242 (CV1510)
E1248 CV8
E1254 Oscillator triode for VT fuze
E1255 (CV40) magnetron, 10cm, 100 - 200kW
E1256 (CV42) magnetron, 9.1cm, 100 - 200kW
E1265 (CV114)
E1266 CV15 - block mounted VT90 with smaller filament
E1267 CV41 magnetron, 10.7cm, 100 - 200kW
E1271 Tetrode (CV57)
E1273 CV58 or CV258 axial mixer diode
E1274 All concentric TX triode for <50cm
E1287 S-band magnetron (CV23?)
E1289 Thyratron (CV1248)
E1290 Triode amp., anti-microphonic
E1297 (CV5)
E1305 Grounded grid triode, similar to RL7
E1320 (CV51)
E1323 Triode (CV344)
E1324 Magnetron, Scientists War - not traced
E1325 Magnetron (CV56) strapped E1189
E1326 Magnetron (CV69) strapped E1198
E1330 (CV268, or CV123?))
E1331 (CV1510)
E1332 Triode (CV92)
E1335 High gain rugged midget pentode (CV61)
E1336 Triode, rugged miniature (CV229, or CV122, or CV266,or CV267?)
E1337 (CV78)
E1342 Magnetron E1326 with reduced anode length (CV64, or CV160, or CV186?)
E1344 Triode, common grid-earther grid oscillator/receiver
E1355 (CV1343)
E1356 TR switch
E1359 Magnetron (CV76) cf. E1325, 25kV, 40A, 2µs, heavy duty cathode
E1360 (CV268)
E1362 (CV126)
E1364 Rugged miniature gas triode
E1365 Waveguide TR cell, 3cm (CV114)
E1366 Midget valve for torpedo school
E1368 Triode (CV90, or CV350?)
E1371 Diode (CV105)
E1373 Magnetron (CV99) similar to 1325/1359, 8.5cm
E1374 Concentric valve for up to 2GHz
E1378? May be invalid
E1379 Magnetron (CV79) formerly E1210DE, 6.6cm
E1380 Magnetron (CV89) formerly E1210DE, 6.3cm
E1389? Magnetron (CV89) (MUST BE WRONG)
E1411 CV153
E1415 ATR cell (CV115) slotted disc cell for 10GHz
E1416 (CV281)
E1417 TR switch (CV117)
E1419 Triode (CV154)
E1421 TR cell
E1423 Tetrode (CV406)
E1429 Magnetron (CV79)
E1436 (CV188)
E1440 Smaller version of CV90 with 2W cathode
E1453 (CV319, or CV1646?)
E1457 Large disc seal triode, 5 to 10kW pulsed at 3GHz (CV257)
E1458 Triode (CV178)
E1459 Tetrode (CV174)
E1463 Hydrogen triode, 160kW, 2500pps (CV319?)
E1465 CV115
E1468 Noise diode (CV172)
E1474 (CV78)
E1480 Triode (1419) without internal feedback
E1481 Magnetron CV192 (CV64 for higher input)
E1485 (CV807)
E1487 Magnetron CV208 , 12 segment, strapped, 10GHz
E1488 (CV182)
E1489 Double pentode (CV222)
E1494 Magnetron CV191, 1487 for higher frequency
E1495 'higher power' CW valve (CV259) "10x CV55" for 600MHz
E1496 1239 improved and modified for lower frequencies. CV240. "4x NT99"
E1497 Hydrogen diode CV215 for absorbing overswing energy in a network
E1511 Magnetron (CV355) High power X-band, lower frequency than 1487
E1516 TR switch CV221. CV114 with shorter discharge gap, wider band, gold seals, copper body
E1524 Fullwave gas rectifier (CV338)
E1527 (CV290)
E1531 Magnetron CV214, E1494 with coaxial to waveguide feed, limited frequency range
E1532 Triode (CV1644)
E1541 Triode (CV1716)
E1547 ACT23
E1563 (CV1863)
E1591 (CV181)
E1599 (CV273)
E1606 (CV278)
E1633 (CV456)
E1647 (CV288)
E1648 (CV135)
E1659 (CV453)
E1706 (CV437)
E1709double triode (from actual example)
E1714 (CV408)
E1769 DET24 (CV397)
E1796KT101 (from actual example)
E1824 Tetrode?
E1838DH81 (pen markings on actual example)
E1841 Hexode?
E1860 (CV240)
E1935 (CV415)
E1938 (CV493)
E1954 (CV25)
E1955 Thyratron (2D21) (CV797)
E1956 (CV261)
E1959 (CV495)
E1996 ACT25 (CV436)
E2004 (CV2115)
E2016 (CV1758)
E2018 (CV454)
E2095 (CV471)
E2121 Noide diode (CV2341)
E2133 (CV2276)
E2134 Pentode (CV2179)
E2163 (CV491)
E2164 (CV492)
E2196 (CV3920)
E2221 (CV2277)
E2226 Output pentode
E2244 (CV3921)
E2266 Pentode (CV2231)
E2277 Pentode (13E1)
E2631Looks to be a halfwave rectifier (from actual example)
E2729 Triode (CV6097)
E2760 (CV5747)
E2788F (CV5405)
E2792 (CV6097)
E2801 (CV5363)
E2811 TR switch (CV5210)
E2815 Pulsed attenuator (CV5315)
E2908 Triode (CV5326)
E2960 Geiger tube (CV6133)
E2975 Triode (CV4120)
E2978 (CV6129)
E2987 TR switch (CV5398)
E3000 (CV9774)
E3001 (CV9775)
E3084 (CV6028)

Compiled from "The Saga of Marconi Osram Valve", "Metres to Microwaves", "A Scientists War", the CV Register, papers in the UK National Archive, other references and valves in my own collection or seen elsewhere. Please do not copy without reference! Note that the information in brackets shows where an equivalent was listed, but where there is insufficient information to say if it was an actual equivalent or a possible substitute. Refs: (1) = UK National Archive AVIA 7/121 (2) AVIA 7/921

This file was last modified 08:40:54, Monday August 01, 2022