Additional material by A C Wyatt.
Where the valve is exhibited within the museum the link is within tab one. If the original Type that the experimental valve is based upon is within the museum, the link is within tab two.
J F Turner, October 24, 1938.
Type | Detail and (notes) |
E2 | 80 Watt rectifier. Nickel anode filament 0.15 mm diam × 27 set. Bulb No. 282. |
E3 | 100 Watt rectifier. Nickel anode 0.15 mm diam × 35 set. Bulb No. 282. |
E4 | 4-electrode valve, double anode 11 mm diam × 18 long. Filament 0.06 mm diam × 24 mm long. Bulb No. 148. |
E5 | 4-electrode valve, anode 15 mm diam × 23 mm long. Filament 0.063 mm diam × 28 mm long. Bulb No. 99. |
E6 | 5-electrode valve, two grids and two anodes. Anodes 9 mm diam × 9 mm long. Filament 0.063 diam × 37 mm long. Bulb 25 mm diam × 105 mm long. |
E7 | 3-electrode TX valve. Nickel anode 65 mm diam × 12 mm long. Filament 0.47 mm diam, set length 152 mm. Bulb No. 283. |
E7A | 3-electrode TX valve. Nickel anode 65 mm diam × 100 mm long. Filament 0.47 mm diam × 120 mm set. Bulb No. 283. |
E8 | Rectifier. Anode 4 mm diam × 17 mm long. Filament 0.096 mm diam × 26 mm. Coiled to 20 mm. Bulb No. 290. |
E9A | 3-electrode TX valve. Nickel anode 45 mm diam × 50 mm long. Filament 0.22 mm diam. × 60 mm set. Bulb No. 265. |
E9B | 250 Watt 3-electrode TX valve (Standard). |
E10 | Modified R valve, grid 7 turns in 16.5 mm. |
E11 | Rectifying valve. Tubular anode 4 mm diam × 24 mm long. Filament. 0.076 mm diam × 28 mm long. Bulb No. 270. |
E12 | 3-electrode TX valve. Nickel anode 38 mm diam. × 65 mm long. Filament. 0.23 mm diam × 88 mm set length. Bulb No. 265. |
E13 | Special rectifying valve. Nickel anode with 8 projections 25 mm diam × 25 mm long. Filament 0.142 diam × 30 mm set. |
E13A | Rectifying valve. Anode with 8 projections. Anode 10 mm diam × 16 mm long. Filament 0.096 diam × 26 mm long. |
E15 | 3-electrode TX valve. Nickel anode 24 mm diam × 37 mm long. Filament 0.17 mm diam × 37.5 mm set length. Bulb No. 265. |
E16 | 3-electrode TX valve. Nickel anode 43 mm diam × 60 mm long. Filament 0.27 mm diam × 70 mm set length. Bulb No. 286. |
E17 | 3-electrode TX valve. Nickel anode 49 mm diam × 85 mm long. Filament 0.23 mm diam × 88 mm set length. Bulb No. 280. |
E18 | Nickel rectifying valve. Nickel anode 30 mm diam × 35 mm long. Filament 0.215 mm diam × 50 mm straight. Bulb No. 266. |
E19 | Special 3-electrode TX valve. Nickel anode 54 mm diam × 7 mm long. Filament 0.35 mm diam × 95 mm set. Bulb No. 283. Grid and anode seals to carry 10 Amps. |
E20 | 3-electrode modified R valve. Grid 3.5 mm diam 0.15 mm diam wire 16 turns into 19 mm. |
E23 | 3-electrode valve. Nickel anode 43 mm diam × 60 mm long. Filament 0.27 mm diam × 70 mm set. Grid and anode leads to carry 10 amps. Bulb No. 265. |
E25 | Tungsten anode 3 electrode TX valve. Anode 45 mm diam × 50 mm long. Filament diam 0.27 mm × 70 mm set. Bulb No. 280. |
E26 | Tantalum anode 3 electrode TX valve. Anode 54 mm diam × 52 mm long. Filament 0.35 mm diam × 70 mm set. Bulb No. 280. |
E27, E27B | Tubular 3-electrode valve for Marconi's. Nickel anode 12 mm diam × 35 mm long. Filament 0.76 mm diam, × 50 mm long. Coiled filament springs. Bulb No. 281. (See McVitie-Weston H64). |
E28 | Modified MT4 TX valve. Grid and anode leads to carry 10 Amps. Bulb No. 265. |
E29 | 3-electrode TX Valve. Nickel anode 32 mm diam. × 60 mm long. Fil. 0.27 mm diam. × 70 mm set. Grid and anode lead to carry 10 Amps. Bulb No. 265. |
E30 | 3-electrode TX valve. Nickel anode 31 mm diam × 60 mm long. Filament 0.27 mm diam. × 70 mm long set length. Grid and anode leads to carry 10 Amps. Bulb No. 265. |
E32 | 3 electrode TX valve. Anode 54 mm diam. × 70 mm long. |
E33 | Filament 0.35 mm diam × 95 mm set. Anode legs nichrome tipped with molybdenum. Bulb No. 280. |
E35 | Tubular dull emitter valve, Nickel anode ? mm diam × 12 mm long. Filament 0.025B mm, diam × 8 mm set. Bulb 18 mm tubing. Unique grid construction. (Text of original difficult to read). |
E37 | Tungsten 3 electrode TX valve. Anode 54 mm diam × 70 mm long. Filament 0.47 mm diam × 95 mm set. Bulb No. 283. |
E38 | Tungsten 3 electrode TX valve. Anode 45 mm diam × 70 mm long. Filament 0.35 mm diam. × 95 mm set. Bulb No. 294. |
E39 | Tungsten anode rectifying valve. Anode 25 mm diam. × 31 mm long. Filament 0.2 mm diam. × 0.35 mm set. Bulb No. 265. |
E40 | Modified MT4 TX valve. Grid 28 mm diam × 120 mm long. Mesh 12 squares per cm. Bulb No. 265. |
E41 | Tungsten 3 electrode TX valve. Anode 45 mm diam × 50 mm long. Filament 0.27 mm diam. × 70 mm long. Bulb No. 294. |
E42 | Modified MT4 TX valve. Grid diam 28 mm × 120 mm. Mesh 30 sqs per inch. |
E43 | Tungsten anode TX valve. Molybdenum strip grid. Anode diam 43 mm × 70 mm long. Filament 0.2 mm diam × 47 mm long. |
E44 A & B | Modified MT5 TX valve. Anode 17 mm diam × 26 mm long. Grid 6 mm diam, 0.2 mm diam. wire 32 turns into 32B mm. |
E46 | 3 electrode valve. Anode 9 mm diam. × 12 mm long. Filament 0.045 mm diam. × 20 mm long. |
E47 | 3 electrode TX valve. Nickel anode 49 mm diam. × 35 mm long. Filament 0.17 mm diam. × 37.5 mm long. |
E48 A & B | Flat Plate 3 electrode valve 20 mm tubing. Filament 0.12 mm diam. × 19 mm set. Disc anode 20 mm diam. |
| |
E50 | Special V24 six turns per cm grid. |
E51 | Nickel transmitting valve with anode 45 mm diam. × 150 mm long. |
E52 | Nickel valve with anode of flat plates 60 mm × 60 × 25 mm 'M' filament and nichrome bar grid. |
E53 | Nickel transmitting valve. Anode 560 mm × 90 mm long. Oval grid of nichrome wire. |
E54 | Tantalum anode valve, 45 mm diam. × 70 mm long. |
E55 | Tantalum anode transmitting with 10 Amp filament. |
E56 | Small molybdenum transmitter (Radiotron). Anode 6 mm × 17 mm. |
E56A | As above, anode 4 mm × 17 mm. |
E56B | As above, anode 5 mm × 17 mm. |
E56C | As above, anode 5.5 mm × 17 mm. |
E57 | Molybdenum TX valve. Anode 30 mm diam × 35 mm long. |
E58 | Nickel TX valve. Anode 60 mm diam. × 95 mm long. |
E59 | Plate anode valve, 13 mm × 19 mm, nickel grid 13 mm × 21 mm, 6 sqs. per cm. |
E59A | As above, grid 25 mm × 21 mm. |
E59B | As above, grid 13 mm × 21 mm. |
E60 | Molybdenum TX valve. Anode 48 mm diam, × 80 mm long. |
E61 | No particulars. |
E62 | Molybdenum TX valve. Anode 43 mm diam. × 60 mm long. Grid and anode supported from same end. |
E63 | Nickel valve. Anode 20 mm diam. 30 mm long grid with molybdenum mesh. |
E63A | As above but shorter filament. |
E64 | No particulars. |
E65 | No particulars. |
E66 | Anode diam. 34 mm, no further details. |
E67 | Molybdenum valve in American H. glass. Copy of American 1000 W valve. |
E68 | Molybdenum anode valve for Franklin. Capacity between grid and anode bands. |
E70 | Special soft valve in tubular bulb with positive and negative anodes. |
E71 | Early MT9F. (Shortwave MT9). |
E72 | Double anode rectifier (Later MT9). |
E73 | Receiving valve. Filament 2 V, 0.12 A (now DET2). Probably 2 V, 0.12 A DE2 (KRT). (DE2?). |
E73A | As above but high μ. |
E74 | Double E73 loudspeaker valve with 4 V filament. |
E74A | Two E73 filaments in DE5 electrodes. |
E75 | As E74 but parallel 2 V filaments. |
E76 | 'Carpenter' experimental valve. Argon filled. |
E77 | DE3 in miniature bulb with V24 capping contacts. |
E77A | As above but ebonite cap in V24 holder. |
E79 | Tubular valve with mesh grid for Dynatron trials. |
E80 | Ditto but with spiral strip grid. |
E81 | 6 V, 0.1 A DE8 valve (HF & LF). Later became 0.12 A. |
E82 | 25 Watt short wave transmitting valve for Woolwich Signals. V24 type. |
E84 | 2 V, 0.8 A loudspeaker valve. |
E85 | 2 V, 0.5 A loudspeaker valve. (Became DE6). |
E88 | Bi-phase rectifier for low anode volts two G.U.? filaments in one anode. (GU2 filaments?). |
E89 | Special GUR for Capt. Round with half anode round each leg of filament. |
E91 | DE6 filament in LS5 electrodes. |
E92 | Single filament D6 (fine clearances). |
E93 | LS5 without anode to demonstrate heating of filament leg. (Research Exp.). |
E94 | Special T250 for short wave. |
E96 | Flat anode receiving valves for Capt. Round. Mesh grids, double ended. |
E96 A - H | Various types of double ended valves for Capt. Round. |
E98 | Independently heated cathode valves. |
E98H | Not traced. |
| |
E101 | 'W' Filament. D.5 bulb. |
E102 | DE5 type electrode valve for Capt. Round. |
E104 | U4 = DE5 without grid. (See McVitie-Weston H65. |
E105 | New DE4 with 4 V, 0.12 A filament. (New DE4). |
E106 | Special high-mu rectifier for Capt. Round. 1 V filament and 1 mm grid. |
E108 | 'W' filament valve. |
E109 | Improved 4 electrode trials. |
E110 | New Barium filament valves. (Barium filament trials). |
E112 | Gas rectifier. |
E113 | 5 electrode tubular MWT. |
E114 | Special telephotographic apparatus for MWT. |
E115 | Dull emitter rectifier for DET1, etc. |
E116 | Very low impedance LS5A. for MWT. |
E117 | Special non-microphonic valve for MWT. |
E118 | DET1 with heavy grid and anode leads. |
E119 | 5 electrode type of DE10 with 'W' filament. |
E121 | Extra high-mu valve. DE5B with μ = 50 & μ = 100. |
E123 | Anti-microphonic valve with internal springing. |
E124 | Austrian Wolfam Wire Trials. |
E125 | White platinum in pinch (MT5 for Short wave). |
E127 | 4 electrode valve (Ex. Philips) repaired for the Marconi Co. |
E128 | Modulation valves as E120 with molybdenum anode. |
E129 | Modified FE1 type valves. Filament Std. Outer grid mesh as fine as possible. Anode Std. Inner grid very fine gauge wire. Grid-to-anode clearance as small as possible (Turns ½ Stan. turns.) Inner grid diam. ½ diam. of outer grid. |
E130 | 'Audion' four-electrode valve for Marconi Co. |
E131 | Not traced. |
E132 | Directly heated 2 V triode for GPO. (Became CV1643). |
E133 | New 4.5 V 'W' filament and repeater valve for GPO (0.80 A). (Became POVT38 & CV1645). |
E134 | DET3 modulator, molybdenum electrodes. |
E135 | Short-wave MT5B valve. |
E136 | Carbonised DE5 with 0.4 A filament. DE5 pinch. |
E137 | Modified DE40, 0.25 A filament. DE5 pinch. |
E138 | DE5B. Caesium filled. Made at Research Laboratories. |
E139 | DE5 with grid seal in bulb. |
E140 | LS5 with grid seal at pip end of the bulb. |
E141 | Special double MT5 with coils in bulb (MWT.). |
E142 | T400M for short wave. |
E144 | DE10 electrodes and DE210 filament. |
E146 | 'K' type valve for high Ea. LS5 characteristics. |
E147 | Coated filament type P240. (Coated filament). |
E148 | Double loop LS5A. |
E149 | Treble loop LS5A. |
| |
E150 | 3.8 V, 0.06 A valve with thoriated filament. |
E152 | Large indirectly heated cathode bi-phase rectifier. |
E153 | Coated filament valves type P625. (Coated filament P625). |
E155 | 7 electrode valve. |
E156 | Special LS5A (MWT.) with 1.55 A filament. |
E157 | 1 V, 1 A valve for AC use. (Pre Point 8 series). |
E158 | Special short-wave valve for Mr Franklin. |
E159 | Special low-mu valve for Capt. Round. Double spiral grid in separate parts with one part connected to anode. |
E160 | DEP425. |
E161 | GR1 in large bulb (S.57). No resistance in anode circuit. |
E162 | Standard GR1 without resistance in anode circuit. |
E163 | Spare for gas tubes. |
E164 | Five-electrode valve with P625 barium filament. |
E164A | Not traced. |
E165 | P625 with lower μ value for 120 V max. |
E166 | DE610 extremely low μ valve (MWT.). |
E167 | T450 valve with MT6 filament. |
E168 | MT9 valve with MT9 grid. |
E169 | Special MT5 single 1 mm molybdenum wire for grid (MWT). |
E170 | MT11 short wave. |
E171 | MT11A short wave. |
E172 | Thermionic rectifier 100 mA, 400 V DC maximum output. (Became U8?). |
E173 | DE210 valve μ = 15. |
E174 | Double-sided S215, 4-pin cap, flat plate anode with connection at top. (S215). |
E175 | Large single phase coated filament rectifier. |
E176 | MT11 short wave with molybdenum anode. |
E177 | Coated filament bi-phase rectifier for 75 mA rectified current. |
E178 | High-power, short-wave platinum thimbles. MT9F anode and grid. 25 A filament. |
E179 | 2 Volt double-ended screen grid valve. |
E180 | Similar to E158 but with 'W' filament. (Two DET1 filaments.). |
E181 | Binocular transmitting valves (anode as MR9). |
E183 | BBC 2 Volt valve, μ = 25. |
E184 | BBC 2 Volt valve, μ = 6. |
E188 | KL2. |
E189 | KH2. |
E190 | Coated filament rectifier for 20 mA rectified current. |
E191 | AC detector valve 6 V, 1 A single thick filament. |
E192 | MT10 valve, μ = 5 (MWT.). |
E193 | HL610 valve. (HL610 production in 1928). |
E194 | Bi-phase rectifier for Capt. Round. |
E195 | Cathodes not sintered. |
E196 | Point 8 pentode. |
E197 | 4 Volt pentode. |
E198 | 6 Volt pentode. |
E199 | D.E valve similar to DEM3 but without grid. |
| |
E200 | 0.6 V, 1 A detector for AC. |
E201 | Modified MT4, μ = 125, ra = 85k. As ordered by Mr Picken. (Graph dated 31.08.28). |
E202 | Modified MT6. |
E203 | LS6A (E148) with μ of 5. |
E204 | MT6B - molybdenum - short wave. |
E205 | Point 8 Volt AC detector. (D.8 production in 1929). |
E206 | Special DE5 valves with 4.5 V, 0.3 A filament. |
E207 | 4 Volt coated filament rectifier for 20 mA single phase P.425 filament and anode. |
E208 | P625A with μ = 2. |
E209 | S625 valve modified to have two anodes (no grid). |
E211 | Low goodness L410 coated filament. |
E212 | Low goodness L410 thoriated filament 0.06 Amps (actual) filament. (Thoriated filament). |
E214 | Wembley filament, oxide coated. |
E215 | Non-microphonic H210 valve. |
E216 | 6 Volt pentode, 8 Watts. |
E217 | 4 Volt screen 'K' valve. |
E219 | DET1 but with LS6A construction. |
E220 | P625.A type but with anode designed to stand 8 to 10 Watts. |
E222 | Experimental (See McVitie-Weston H66). |
E223 | Large short-wave transmitting valves 1.5kW loss (2.25 test). |
E224 | Similar to E178 but with tantalum electrode. |
E225 | Loudspeaker valve for 110 W loss continuous. |
E226 | 2 V, 0.1 A azide valve to run at low temperature (2 mA emission). Marconi's for Capt. Round. |
E228A | 4 V power valve, 12 W anode 3.5 goodness. |
E229 | Indirectly heated cathode valve KH1. (KH1 production in 1927). |
E230 | Non-microphonic type valve with 2 V, 0.25 A filament. |
E233 | D.8 valve but with μ = 26, ra = 45,000. |
E235 | Mercury rectifier Ex. Research 0.25 A @ 1 kV. 4 V, 3 A filament. |
E236 | 'R' valves with non-thoriated tungsten filaments. |
E238 | Screen as E217 (MS4), Wembley filament and screen grid valve, 2 V filament. |
E239 | 6 V barium filament power valve. |
E240 | 4 electrode valve as Philips A441N. |
E241 | Small rectifier 4 V, 0.1 A barium filament. Std. 410 anode. |
E242 | Special trial of H210 non-microphonic valves using stranded cable as filament supports. |
E243 | Rectifier E219 without grid systems. |
E244 | Large mercury vapour rectifier ex. Research 1 A @ 10 kV. |
E245 | New MS4 (E217). (New MS4). |
E247 | Mercury-vapour rectifier ex. Research (1,000 mA output) 1 kV AC 4 V, 0.11 A filament. |
E248 | American AC screen valve with 2.5 V heater. |
E249 | CAT. |
| |
E250 | LS6, μ = 7. |
E253 | CAT10X. |
E254 | CAT11X. |
E255 | Mercury rectifier similar to E247 but anode connection brought out at top 4 V, 0.11 A filament, 3 kV. (Babani says 5 V, 6.5 A filament). |
E256 | P210 with Wembley filament. |
E257 | HL210 valve with Wembley filament. |
E289 | MH4. New characteristics. |
E260 | LP610 with Wembley filament. |
E261 | MHL4. New characteristics. |
E262 | MH4. New characteristics. |
E263 | L210 with Wembley filament. |
E264 | 4 V Super Power valve pellet activation. |
E265 | P220 valve with barium filament. |
E266 | Oxide-coated rectifier. |
E267 | CAT11X modified. |
E268 | PX4 with 2.5 V, 1.5 A. filament as American UX245. |
E269 | As Philips A415: HL4075. |
E270 | CAM4. |
E271 | UY227, μ = 9, gm = 1 mA/V. 2.5 V, 1.75 A filament. |
E272 | Large anode CAT6. |
E273 | UY224, μ = 440, ra = 440k, gm = 1 mA/V. 2.5 V, 1.75 A filament. Capacity 01 pF. |
E274 | Screen grid valve. Modified DA60. |
E275 | Short wave MT5. |
E276 | 2.5 V, 1.75 A filament, μ = 18, gm = 2.55 mA/V. |
E277 | 30 mA rectifier. |
E278 | LS5 type valve μ = 18, gm = 1.0 mA/V. For GPO. (POVT25). |
E280 | AC pentode, 4 V 1 A, Ea = 250. |
E281 | Power pentode 4 V, 1 A filament. Ea = 400, Ew = 12. |
E282 | DEMT9F (Ex. Research). |
E283 | 4 V, 2 A filament, barium filament rectifier 120 mA, 500-500 V. |
E284 | Special CAT2 with 75 A filament for GPO. |
E285 | New full-wave rectifier equivalent to UX280. |
E288 | DES1. |
E289 | DES2. Two necks. |
E290 | DC indirectly heated valve with 16 V, 0.25 A heater. |
E291 | DC indirectly heated screen grid valve with 16 V, 0.25 A heater. |
E292 | Modified CAT9 with ¾ in anode. |
E293 | 4 Volt Wembley filament triode valve. |
E294 | 4 Volt Wembley filament screen grid valve. |
E295 | 2 Volt Wembley filament pentode. |
E296 | 4 V, 2 A filament barium valve μ = 102, gm = 8 mA/V, Ea = 500, Ew 23, as E 410. |
E297 | As Mullard S4VB. |
E298 | Oxide-coated rectifier 120 mA, 350-350V. |
E299 | Oxide-coated rectifier 30 mA. |
| |
E300 | 60 mA, 500 V AC single valve. |
E301 | UX266. |
E302 | 4 V, 1 A filament barium valve, High μ, Ea = 400 V. |
E303 | 4 V, 1 A mains valves. Improved characteristics. |
E304 | GU1 with anode in top of bulb for 5 kV. DC. |
E305 | 4 V, 1 A filament barium valve, as Philips E406. |
E306 | MR4 with swan neck supports. |
E307 | CAR4 for 20 kV AC operation. |
E308 | Modified DES2 with three necks. |
E309 | Indirectly heated DEM2. |
E310 | Single-ended DEM3. |
E312 | Modified R valve. |
E313 | DC indirectly-heated power valve. |
E314 | Special double grid valve (S.A.I.T.). |
E315 | Indirectly-heated detector pentode. |
E316 | MS4 with anti-secondary grid. |
E318 | Oxide coated strip 6 V, 1 A filament, Ea 400, Ew 25. |
E320 | Indirectly-heated DC pentode. |
E321 | Short-wave valve as Philips TB1/50. |
E322 | Oxide coated 4 V, 1 A, 120 mA, 500 V. |
E323 | 4 V, 1 A, 200 V, 8 W pentode. |
E324 | 250 kW water-cooled anode. |
E325 | MX245 oxide coated. |
E326 | GU1 with mesh grid. |
E327 | BG2. |
E328 | Indirectly-heated bi-grille. |
E329 | Oxide coated filament U8. |
E330 | Vertical construction H2. |
E331 | Low impedance MS4. |
E332 | 4 V thyratron. |
E333 | CAR2. |
E334 | Oxide coated filament PX4. |
E335 | 4 V, 2 A, 25 Watts power valve. |
E336 | S410 Wembley filament with anti-secondary grid. |
E337 | Special short wave LS5. |
E338 | Special short-wave R-valve. |
E339 | Modified E178 as Ediswan ES1500A. |
E340 | MS4 with tail. |
E341 | UX.865 small screen grid transmitting valve. |
E342 | 4 V, 1 A, AC power valve. |
E344 | HL2 in T.32 Bulb for Marconi Co. |
E345 | UY235. |
E346 | CAT10 with 5 in anode. |
E347 | MX247, 25 V indirectly-heated pentode. |
E348 | VT68, μ = 5. |
E349 | Low impedance S22. |
| |
E350 | DSB, gm = 3.2. |
| VMS4B. |
E352 | Split-anode magnetron. |
E353 | VDS. |
E354 | 35 V filament CAT9. |
E355 | Low 'R' MS4B to work at Esg = 30. |
E356 | Copper anode triode. |
E357 | Copper anode screen grid. |
E358 | Copper anode pentode. |
E359 | 25 Watt pentode with thoriated filament. |
E360 | PT4X = PT25. |
E361 | G415 repeater 0.15 A coated strip filament. |
E362 | Modified E312 with molybdenum grid no damping wires. |
E363 | 'R' valve type E338 with bead breaking damping wire circuit. |
E364 | Modified T30. |
E366 | Oxide coated DA100. |
E367 | PT425X. |
E368 | TC1/75. |
E369 | Power pentode. |
E371 | Mullard 904 indirectly-heated = MH41. |
E372 | Special short-wave valve 12.5 V (filament anode inside grid). |
E373 | Low-capacity peak voltmeter (small) rectifier. |
E374 | Low-capacity peak voltmeter (large) rectifier. |
E375 | 4 V, 1 A indirectly-heated thyratron. |
E376 | PT4 with screen? grid brought out to side terminal (Marconi). (Screen grid). |
E377 | MS4 with anti-secondary for Marconiphone. |
E378 | MS4B with anti-secondary for Marconiphone. |
E379 | Variable μ S21. |
E380 | MPT4X, gm = 5.0. |
E381 | MHH4, gm = 6.0, as AC2/HL. |
E382 | PT4 oxide coated as MY247. |
E383 | Modified DT, anode 2 × minor axis, grid 2 × normal pitch. |
E384 | Short cathode MS4B, gm = 5.0 mA/V. |
E385 | Low impedance U14. |
E386 | UX.50. |
E387 | Modified V24 for Marconi's. |
| Peak voltmeter valve. |
E389 | Modified DET, SW Marconi's. |
E390 | Metallix EHT rectifier. |
E392 | High gm indirectly-heated DC valve. |
E393 | New design MS4B. |
E394 | Screen MPT4 for HMV Hayes. |
E395 | Mercury-vapour MS4 valve?. |
E396 | Split-anode magnetron, 50 Watts crosswise anode. Filament 4 V, 3 A = E1500. |
E397 | 'R' U.S.W.T. receiving, 'L' -do- as Genoa sample. |
E398 | 'R' U.S.W.T. Transmitting. 'L' U.S.W.T. transmitting. |
E399 | Battery charger, as Philips 367. Filament 1.8 V, 8 A, output 6 A @ 30 V. |
E398B | |
| |
E400 | Battery charger as Philips 1039. Filament 1.8 V, 18 A, output 15 A @ 72 W. |
E401 | CAV rectifier (CAR6.X). |
E402 | CAV U.S.W.3. |
E403 | 150 kV EHT rectifier with anode and four loop. |
E404 | E361 with μ = 40 for HMV. |
E405 | New design MS4. |
E406 | High μ push-pull valve, 4 V AC type. |
E407 | High μ push-pull valve, 16 V. DC. |
E408 | S22 with AC connected to screen. |
E408N | |
E409 | New screen design VMS4. |
E410 | 2 V push-push valve. |
E411 | Mercury-vapour U14. |
E412 | Push-Push PX25. |
E413 | As RCA type 55, AVC diode detector and amplifier. |
E414 | DEV fitted with 1 V Wembley filament. |
E415 | 16 V duo-diode triode as RCA type 55. |
E416 | PT2 with anti-secondary grid connected to screen grid for use as Class B. |
E417 | Air-cooled anode DA60. |
E418 | PT2 with anti-secondary grid connected to anode for use as Class B. |
E419 | DES2 with bright emitter filament (MT9). |
E420 | Special LS5B, E600, Ew = 15; 6 V, 1 A filament (for Marconi's). |
E421 | E361 with μ = 200 (for HMV). |
E422 | Indirectly heated rectifier. |
E423 | MH4 new design with flat cathode. |
E424 | MS4B flat cathode design. |
E424N | Not traced. |
E425 | Special double cathode MS4B for HMV. |
E426 | E361 μ = 7. |
E427 | Modified SW CAT12. |
E428 | E244 with grid. |
E429 | Indirectly heated cathode DES3. |
E430 | Indirectly heated CAT14, E324. |
E431 | E381, μ = 60. |
E432 | S215, as Cossor 215SG. |
E433 | Variable μ S21 with gm = 2.0 mA/V, for HMV. |
E434 | VMS4B. |
E435 | Rectifier, 220 Volts 60 mA, 220 Volt filament. |
E436 | 'Ostar' valve, 220 Volt filament. (See Ostar Ganz) |
E437 | Low impedance power valve as Micromesh PLA1 (for HMV). |
E438 | Super quiet MH4 (for Marconi's). |
E439 | Special PT. for Push-Push negative Class B (for HMV). |
E440 | Multi-connection pentode (for Marconi's). |
E441 | MPT4, flat cathode, gm = 3.0 mA/V. |
E442 | Small split-anode magnetron, 3 mm diam. anode. |
E444 | 1 Volt valve HL construction, 18 mm bulb. |
E444S | Not traced. |
E445 | E244, air-cooled anode type. |
E446 | Oxide coated DET1. |
E447 | Special MS4B with grid to top terminal. |
E448 | VMS4 with flat cathode. |
E449 | Variable-mu E384. |
| |
E450 | Special screened MPT4 valve, No. anti-secondary grid, mesh lined anode. |
E451 | PT2 with screen omitted and anti-secondary to screen pin. |
E452 | HL2, μ = 35, gm = 1.3 mA/V; 2 V, 0.1 A filament. |
E453 | VT78, μ = 7, ra = 5,500, as E361. |
E454 | VT80, 2 V, 0.15 A, μ = 30, ra = 50k, H2 type. |
E455 | GT2. |
E456 | Battery charger half wave 700 Volts 15/20 A total Ie. |
E457 | 8 V, 0.25 A universal valve acar DC 'H'. (What is acer?). |
E458 | Double diode H2. |
E459 | Indirectly-heated battery HF pentode with 2 V, 0.25 A heater. |
E460 | Oxide coated rectifier with 2 V, 0.25 A filament. 7 kV, 2 mA. |
E461 | DET1 with air cooled anode. |
E462 | MT13L. |
E463 | Two MH4 systems mounted in one bulb (for HMV). |
E464 | Double class B valve. Two grids in each anode; 2 V, 0.2 A filament. |
E465 | 150 Watt split-anode magnetron. |
E466 | New S21 as new S215. |
E467 | VS215 as Mazda S215/VM. |
E468 | Hexode, No 4 grid taken to top terminal. All other electrodes through pinch. (MX40?). |
E469 | Hexode, HMV, No.1 grid to be brought out to top terminal. All other electrodes through pinch. |
E470 | Hexode. Germany. Telefunken type. No1 grid to top terminal. All other electrodes through pinch. |
E471 | T.G.1. 2 V, 0.2 Amp. Zero bias. Class B. |
E472 | E368 air-cooled anode DA100. |
E473 | Pentode, Ea = 300 V, Wa = 12 W. |
E474 | E309 air-cooled anode (DEM2). |
E475 | Driver valve (L2) for E471. |
E476 | 4 V, 0.15 A, μ = 6, ra = 2000 @ E130 Eg = -8 V. For Marconi Co. |
E477 | Air-cooled anode MT9. |
E478 | S24 Stn. E476 with 2 V, 0.15 A filament, gm = 1.5. |
E479 | 2 V, 0.1 A, directly heated HF pentode. |
E480 | Small double diode, 4 V, 0.5 A. |
E481 | Air-cooled anode, indirectly-heated DE33. |
E482 | HL210 with grid to top terminal. |
E483 | Special MPT4 valve with no control or screen grid for Marconi's. |
E484 | 2 V, directly heated heptode. |
E485 | High voltage MR7A. |
E486 | Double PT2 (M.Y.247 construction) old PT2 construction. |
E487 | 13V E381, two filaments in series. |
E488 | MPT4 with anti-secondary grid omitted, for Marconiphone. |
E489 | HF pentode as E449. |
E490 | 1,500 kW input CAV. (Should this be 1500W?). |
E491 | Straight μ E378. |
E492 | Special combined oscillator/detector for HMV. |
E493 | DA100 rectifier, Catkin type. |
E494 | HL210 without micas, fitted with pot getter. |
E495 | Special EHT2 in soda glass. |
E496 | 4 Volt V24 for Marconi's. |
E497 | CAM12. |
E498 | Air-cooled anode, high slope triode. |
E499 | Air-cooled anode, high slope pentode. |
| |
E500 | MT5 Barkhausen oscillator. |
E501 | DSP1. (DSP1 1933 production). |
E502 | VDP1. (VDP1 1933 production). |
E503 | Special ML4 with Steatite insulator. |
E504 | Helium filled EHT rectifier. |
E505 | 200 kW rectifier with air-cooled anode. (Seems high-power for Air Cooled Anode). |
E506 | Straight μ E479. |
E507 | 1 Volt valve, μ = 5.0, as E444. |
E508 | PT25 with nib-seal. |
E509 | Triode pentode oscillator/detector with separate triode. |
E510 | Triode with 13 V, 0.3 A heater, μ = 80, gm = 6.0 mA/V. |
E511 | Variable-mu HF pentode, Ef = 13 V, If = 0.3 A, gm = 5.6 mA/V. |
E512 | Straight HF pentode, 13 V, 0.3 A, gm = 5-6 mA/V. |
E513 | Output pentode with 13 V, 0.3 A heater, Ea & Es = 180 V, 1.5 W AC. |
E514 | Double diode pentode (output and driver) with 13 V, 0.3 A heater. |
E515 | Double diode variable-mu pentode for AVC 13 V, 0.3 A heater. |
E516 | Double triode for Class B with 26 V, 0.3 A heater. |
E517 | Bi-phase rectifier with 26 V, 0.3 A heater, output 100 mA. |
E518 | Heptode with 13 V, 0.3 A heater. |
E519 | Special diode for ultra short wave (Research). |
E520 | MHD4 with separate lead to diode shield. |
E521 | DET2 with air-cooled anode (ACT2). Thoriated tungsten filament, gm = 3.2 mA/V, Wa = 150 W. |
E522 | DES1 with air-cooled anode. |
E523 | LS5X. |
E524 | 0.2 A Universal Range triode; μ = 40, gm = 3.5 mA/V. |
E525 | RCA 48. |
E526 | Not traced. |
E527 | Special MHD4, low-mu triode and one diode. |
E528 | Special MHD4, low-mu triode and single diode to top cap. |
E530 | DES2 with air-cooled anode. |
E531 | DES4 with air-cooled anode. |
E532 | MT14 with air-cooled anode. |
E533 | DET3 with air-cooled anode. |
E534 | 100 W triode oscillator with air-cooled anode: Telefunken RS243. |
E535 | DET4 with air-cooled anode. |
E536 | Double M13L with air-cooled anode. Modulator thoriated tungsten filament. gm = 6.5 mA/V. Wa = 1.5 kW. |
E537 | 2 Watt super quiet valve for use at BBC. |
E538 | Triode with 13 V, 0.15 A heater. |
E539 | Double diode triode - Universal range. |
E540 | HF pentode with diodes. |
E541 | Low impedance MU14. |
E542 | Balbo RS291 with air-cooled anode. (Should this be Valvo?). |
E543 | MT5 with air-cooled anode. |
E544 | 2 V battery double diode triode, double HL2 construction. |
E545 | Double diode triode battery (L21 triode). |
E546 | DEM3 with air-cooled anode. |
E547 | Double MT13 with air-cooled anode. Now E790. |
E548 | DEM4 with air-cooled anode, 700 Watts. |
E549 | Small DES1. with air-cooled anode for GPO. |
| |
E550 | Pentode without anti-secondary grid, as HMV N40. |
E551 | H30 with grid brought out top of bulb. |
E552 | 8 Watt cathode, high slope pentode N41 (N41 1935 production). |
E553 | VTX4 in DT1 bulb, 12 V, 3 A filament. |
E554 | E508 with anti-secondary to separate lead. |
E555 | EHT rectifier, 250 kV peak reverse. |
E556 | Carbon anode trials (on DET6). |
E557 | DET5 with anode and grid to top seals. |
E558 | Miniature USW triode (RCA). |
E559 | Universal range half wave rectifier, 250 V, 75 mA. |
E560 | As Mullard DO26. (Low MPX25). |
E561 | New design H30 with flat cathode. |
E562 | New design DH30 with flat cathode. |
E563 | New design DN30 in glass. |
E564 | PT6 as E554. |
E565 | Small transmitting valve with 0.3 A filament and carbonized anode. Directed getter for Mr Picken. |
E566 | PT2 with 0.2 A filament, Ea = 120 V, Es = 120 V, Eg = -9V, 1 W output. |
E567 | WD30 with 40 mm cathode. |
E568 | 0.2 Amp Universal Range HF valve with grid at top. |
E569 | Double diode high slope output pentode. |
E570 | PT25H with 8 W cathode UR (Universal Range?). |
E571 | X21 with 0.15 A filament. |
E572 | E552 with double diodes. DN41. |
E573 | Double diode triode pentode. |
E574 | High slope PX25. |
E575 | E503 but μ = 40. |
E576 | Not traced. |
E577 | High Input resistance ML4, gm = 3 mA/V. |
E578 | PT16, Ea = Es = 250, If = 2 A. |
E579 | 3-phase filament cooled anode valve. |
E580 | Low-mu PX4, oxide cathode. |
E581 | Not traced. |
E582 | As E567, 13.0 V, 0.3 A heater. |
E583 | As E552 with 26 V, 0.3 A heater. |
E584 | Indirectly heated oxide coated cathode, cooled anode valve. |
E585 | Triple anode R Valve for Marconi's. |
E586 | E569 with 26 V, 0.3 A heater. |
E587 | 30 V, 0.3 A heater. E586 plus diodes. |
E588 | New E550 with flat cathode. |
E589 | Miniature short wave valve (Button). |
E590 | E567, but with I-E Cap, G/A = 0.004 pF. |
E591 | HF pentode in glass, as W30 but with 4 V heater, grid at top. |
E592 | MPT4 with characteristics of MPT4/k. |
E593 | 2 V, 0.2 A battery indirectly-heated double diode. |
E594 | As E590 but with 13 V, 0.3 A heater. |
E595 | PT4 with ant-secondary grid brought out. |
E596 | CAM5. |
E597 | VMP4 with characteristics of VMP4/K. |
E598 | Modified MHD4. |
E599 | Not traced. |
| |
E600 | Indirectly-heated. PX4 (Filamentary Cathode). |
E601 | USW 208. |
E602 | Not traced. |
E603 | Triode hexode frequency changer for AC mains operation. |
E604 | Not traced. |
E605 | Not traced. |
E606 | Not traced. |
E607 | Glass N30. (N30/G 1934 production). |
E608 | Universal Range output pentode with double diodes. |
E609 | 2 Volt battery triode hexode. |
E610 | CW11. |
E611 | CW11X. |
E612 | 0.4 Amp B21 for Marconi's. |
E613 | 500-0-500 V, 250 mA indirectly-heated rectifier. |
E614 | Not traced. |
E615 | Not traced. |
E616 | Not traced. |
E617 | Magnetron Construction. |
E618 | Not traced. |
E619 | Low capacity PT25. Grid at top and internal screening. |
E620 | High voltage MR4 for peak voltmeter. |
E621 | E603. Triode hexode with 13 V heater. |
E622 | Glass, oxide coated DA6O. |
E623 | 250 Watt valve for Class AB use. |
E624 | New design GU1 for 2500 Volts. |
E625 | Not traced. |
E626 | Not traced. |
E627 | MLD4 with μ = 10 - 12, gm = 1.5 mA/V. - Writtle. |
E628 | VMP4/K in glass but 13 V heater. W30/G. |
E629 | Not traced. |
E630 | Not traced. |
E631 | 250 V half-wave rectifier. 180 mA smoothed with 4μF. |
E632 | Oxide PX4 with 2 V, 2 A filament for hum reduction. |
E633 | E537 but 4 V 0.4 A filament. |
E634 | |
E635 | PX25A used with low impedance load line. Ea = 500 V. |
E636 | UR DL30. |
E637 | Not traced. |
E638 | Anti-microphonic P2. |
| 50 Watt magnetron, 4 anode segments. |
E640 | Not traced. |
E641 | Not traced. |
E642 | GU9. |
E643 | B6 diode. |
E644 | Not traced. |
E645 | Straight-mu E603 without shields. |
E646 | 26 V, 0.3 A half-wave rectifier, 250 RMS 100 mA. |
E647 | Twin ML4s in one bulb. |
E648 | Not traced. |
E649 | Modified MSP4 with shaped G2 for better tail. |
| |
E650 | 2 Volt PX25. |
E651 | N41 with MPT4/G characteristics. |
E652 | Not traced. |
E653 | Not traced. |
E654 | Mercury-vapour rectifier, 200 A, 20 kV. |
E655 | Magnetron. |
E656 | Not traced. |
E657 | X41 (E603), G3 modified to work at lower oscillator volts. |
E658 | E603 (X41) with Go brought out separately from G3. |
E659 | Non microphonic LP2. E638 (P2/B21) with LP2 characteristics. |
E660 | 25 W pentode. |
E661 | X41 with 35 mm cathodes. |
E662 | Low-mu valve L11. (E507) (L11 1934 production). |
E663 | HL2/K (HL2/k 1934 production). |
E664 | VS24/K (VS24/K 1934 production). |
E665 | PT2/K (PT2/k 1934 production). |
E666 | Not traced. |
E667 | Not traced. |
E668 | Not traced. |
E669 | Rectifier U18. (U18 1936 production). |
E670 | Special N41 embodying screening. |
E770(G) | Not traced. |
E671 | Not traced. |
E672 | Not traced. |
E673 | Not traced. |
E674 | New design VS2. |
E675 | Ultra Short Wave ACT9. |
E676 | Czech. LP2. |
E677 | Not traced. |
E678 | Not traced. |
E679 | Separate hexode, straight μ characteristics. |
E680 | Rectifier U17 (U17 1936 production). |
E681 | Mercury-vapour rectifier, GU6. Mesh hood for anode. |
E682 | X31 (X31 1935 production). |
E683 | Modified N41 with grid at top. |
E684 | Not traced. |
E685 | Universal straight-mu triode hexode. Now X34. (X34 not in production). |
E686 | Acorn pentode. (ZA1?). |
E687 | VMS4/24. |
E688 | Not traced. |
E689 | Not traced. |
E690 | Not traced. |
E691 | Not traced. |
E692 | Not traced. |
E693 | Not traced. |
E694 | Not traced. |
E695 | Not traced. |
E696 | Not traced. |
E697 | Not traced. |
E698 | HF pentode, 4 V, 2 W cathode, as RCA 58 but anode at top. |
E699 | Double diode HF pentode, 4 V, 2 W cathode, as RCA 2B7. |
| |
E700 | 2 Watt heptode. |
E701 | 2 Watt double diode triode, as RCA 55. |
E702 | 4 Watt output pentode, as RCA 2A5, but higher sensitivity. |
E703 | Larger edition of Acorn E558 triode. |
E704 | Straight μ W31 for HMV. |
E705 | New design MHD4/A with flat cathode. Specification N41 for HMV. |
E706 | Not traced. |
E707 | Not traced. |
E708 | 13 V E683. Special N41 for HMV. |
E709 | Not traced. |
E710 | 13 V, 4 W Class B valve, as RCA79 (M/Phone). |
E711 | Not traced. |
E712 | E366 with low μ grid. |
E713 | X41 with anti-secondary grid. (Triode heptode). |
E714 | 2 Watt range hexode. |
E715 | Not traced. |
E716 | Not traced. |
E717 | Not traced. |
E718 | Not traced. |
E719 | Not traced. |
E720 | 2 Watt HF pentode. Grid at top. |
E721 | MH40 with μ = 75. |
E722 | N31 for 150 V working. |
E723 | ML4 with 13 V heater. (A723). |
E724 | High slope, 2 V battery pentode. |
E725 | Not traced. |
E726 | 13 V MH40. |
E727 | Not traced. |
E728 | AC/PT8, 750 Watt pentode. |
E729 | CAM3 with special filament. |
E730 | Not traced. |
E731 | Not traced. |
E732 | Special Magnetron. |
E733 | Not traced. |
E734 | 13 V, 0.3 A HF pentode. Grid at top (for GEC). |
E735 | Not traced. |
E736 | Not traced. |
E737 | Not traced. |
E738 | High μ triode, as RCA 6F5 (Now H42). (H42 1936 production). |
E739 | Battery triode hexode, X23. (X23 1938 production). |
E740 | PT5, 25 Watt pentode. |
E741 | Not traced. |
E742 | Similar to American 304A. |
E743 | VM HF Pentode with grid at top. 13 V shielded heater. |
E744 | Tuning indicator. Sector type, Y63 (Y63 1937 production). |
E745 | Low μ triode, as RCA 6C5. |
E746 | Heptode, as RCA 6F7. |
E747 | Straight μ HF pentode, as RCA 6F7. |
E748 | Double diode, D42. (D42 1936 production). |
E749 | 2 Watt double diode triode, as RCA 6Q7. |
| |
E750 | GU10. |
E751 | Output pentode, as RCA 25A6. |
E752 | Not traced. |
E753 | 250 Watt directly heated pentode. ACPT9. |
E754 | PT7. |
E755 | Not traced. |
E756 | 40 Watt pentode. |
E757 | Glass replacement of U15. |
E758 | 4 V low μ indirectly heated triode, as Mazda 3521. |
E759 | Beam type output valve. N66. (N66 not in production) (Later became KT66). |
E760 | Large Acorn, as Western Electric 316A. |
E761 | VS24 with 0.075 grid wires. |
E762 | Battery VM HF pentode, as Mazda VP210, now W21. (W21 1937 production). |
E763 | Not traced. |
E764 | Battery VM HF pentode, as Mazda XP210, now Z21. (Z21 1937 production). |
E765 | Battery LF pentode, as Mazda Pen231. |
E766 | As N41, but Ef = 6.3 V. |
E767 | 6.3 V 0.3 Amp. D41 in 41 mm bulb. separate cathode cons. |
E768 | HL2 with 0.06 Amp filament. |
E769 | Receiving magnetron. |
E770 | ACT10 air-cooled anode type CAT15. |
E771 | QP21 with 0.06 A filament. |
E772 | H11, μ = 30, 0.06 A filament. |
E773 | ACT7. |
E774 | X42 with 6.3 V filament. |
E775 | H42 with 6.3 V heater. |
E776 | W42 with 6.3 V heater. |
E777 | N42 with 6.3 V heater. |
E778 | DH42 with 6.3 V heater. |
E779 | Z42 with 6.3 V heater. |
E780 | E489, tetrode version. |
E781 | X43 (hexode) with 6.3 V heater. |
E782 | N42 tetrode. (N42 replaced by KT42 in 1937). |
E783 | PT2 tetrode. (Beam tetrode?) |
E784 | N31 tetrode. |
E785 | N32 tetrode. |
E786 | N41 tetrode. |
E787 | W42 tetrode. |
E788 | MPT4 tetrode MKT4. |
E789 | Miniature battery triode with 2 V, 0.06 A filament, now L12. |
E790 | Large ACT9. Double MT13 (ACT12). |
E791 | Dull emitter rectifier, 200 Watts, 800 Ω. |
E792 | H30/B. μ = 30. |
E793 | B14 as HMV Hayes. Not standardized, replaced by A864. |
E794 | Low μ ACT9. |
E795 | Single cathode double diode pentode, as DA41. |
E796 | Not traced. |
E797 | QP21 tetrode with 2 V, 0.2 A filament. |
E798 | High slope, 8 Watt cathode triode, μ = 60. |
E799 | Not traced. |
| |
| D42 with H/C system for 3 kV insulation. |
E801 | Not traced. |
E802 | Specially aged MHL4. Ef = 5.5, Ea = 110, Eg = 0. |
E803 | 6.3 V output pentode with E759 shields. |
E804 | Low screen volts HF tetrode (Research). |
E805 | U5 in octal base (U50). |
E806 | H30 with μ = 75. |
E807 | High slope triode, μ = 80, 4 Watt cathode. |
E808 | LP4 in azide assembly, oxide coated filament, ext. res. |
E809 | CAM6. |
E810 | Not traced. |
E811 | Directly heated GU6. |
E812 | Tetrode version N43. |
E813 | M-OV Stabilovolt as STV280/80. |
E814 | N30G tetrode. |
E815 | N42 tetrode. |
E816 | Not traced. |
E817 | Not traced. |
E818 | PX4 with μ = 40. Telev, peak voltage absorption. |
E819 | High slope HF tetrode, 6 Watt cathode. (KTZ41). (KTZ41 1938 production). |
E820 | E577 with μ = 20. |
E821 | 150 Watt magnetron. |
E822 | 6.3 V triode hexode simplified range. (PT11). |
E823 | PT11, 25 Watt pentode. |
E824 | Single system double diode triode battery valve. |
E825 | PT10, 15 Watt pentode. |
E826 | Battery HF pentode. Grid at top. (KTW24). |
E827 | 75 Watt pentode. PT6. |
E828 | Not traced. |
E829 | Not traced. |
E830 | Large CAT14. |
E831 | Gas-filled battery charger. 30 V + 30 V RMS, 1.3 A DC. |
E832 | 10 kW water-cooled pentode. |
E833 | Not traced. |
E834 | Research version of indirectly heated triode. |
E835 | Not traced. |
E836 | Not traced. |
E837 | KT21. (KT21 1937 production). |
E838 | Not traced. |
E839 | Not traced. |
E840 | Modified Y63 for 110 V operation. |
E841 | Hayes tetrode version of W21. |
E842 | HF tetrode in Midget Valve range. |
E843 | Not traced. |
E844 | Not traced. |
E845 | E819 with A8 grid. (GEC). |
E846 | Not traced. |
E847 | 120 mA, mercury-vapour rectifier. |
E848 | Not traced. |
E849 | Not traced. |
| |
E850 | Z63 tetrode. |
E851 | U51 as 5T4, 250 mA output. |
E852 | W63 tetrode. |
E853 | Hayes tetrode version of Z21. |
E854 | High μ version of E789. |
E855 | A855. |
E856 | Not traced. |
E857 | Ring type tuning indicator. |
E858 | ACT11. Air-cooled anode type CAT3. |
E859 | Not traced. |
E860 | High voltage rectifier, 5 kV RMS, output 5 mA. |
E861 | Screened KT66. Now KT8. |
E862 | KT66 triode connected, 5 pin base. |
E863 | KTZ63 with improved microphonic performance. |
E864 | High slope output tetrode, gm = 13.5. |
E865 | Post Office valve. Mercury-vapour rectifier. |
E866 | CW11 with du11 emitter filament. |
E867 | Hard glass pentode. |
E868 | Battery indirectly-heated double diode. |
E869 | MOV equivalent of RCA valve 6J5G. Now L63. (L63 1938 production). |
E87 | Beam tetrode version of PT5 for Hayes Television (KT5). |
E871 | Output tetrode 150/200 V, 0.3 A, aligned. |
E872 | (NT65) Admiralty version PT5. |
E873 | Not traced. |
E874 | Warren design E819. |
E875 | Modified DA100 with μ increased. Ia = 35 mA at Eg = 0. |
E876 | Not traced. |
E877 | Not traced. |
E878 | Non-aligned version of E871. |
E879 | Rectifier 10 kV peak reverse, 2.5 A peak emission. |
E880 | E639 with smaller anode. |
E881 | Not traced. |
E882 | 25 kW pentode. |
E883 | D42 with anode to top cap. (D43). (D43 1939 production). |
E884 | Not traced. |
E885 | Low voltage E819 (KT44). (KT44 1939 production). |
E886 | 6.3 V, 0.15 A output pentode, as EL2 (KT72). |
E887 | Electron multiplier single stage thermionic input. |
E888 | Not traced. |
E889 | Improved version of E887. |
E890 | Not traced. |
E891 | 26 V, 0.15 A indirectly-heated half-wave rectifier. (U71). |
E892 | Not traced. |
E893 | Redesigned LP2. |
E894 | Redesigned P2. |
E895 | DET14, as Taylor Tube T55. |
E896 | MOV version of STV280/40. |
E897 | Screen grid CAT15. |
E898 | ACT9 with MT9L filament. ACT15. |
E899 | Six special valves for University. CWC/FAK3940. (17/2/38) (Note date: 17 Feb 1938). |
| |
E900 | Not traced. |
E901 | KT32 with 1.5 A heater. 5.2 V. GEC Tel. Works. |
E902 | Not traced. |
E903 | MH4 with fluorescing anode for HMV Hayes. |
E904 | 4 Volt E754/PT7 for MWT. |
E905 | MHD4 for Cambridge Instruments. Co. Ig = 2.0 × 10-9A. |
E906 | 200 Watt triode. DET15 and DET16. |
E907 | Indirectly-heated full-wave rectifier with 4 V heater (new MU12). |
E908 | E822/X65 with straight-μ grid. |
E909 | Modified CAT12. |
E910 | Strip filament GU5 with higher rating (GU12). |
E911 | 6.3 V, 0.15 A HF tetrode. (KTW73). (KTW73 has 6 V heater). |
E912 | Pentode system tuning indicator. |
E913 | 6.3 V, 0.15 A version of Y63. |
E914 | 2 V midget output pentode or tetrode. |
E915 | 6.3 V, 0.15 A version of KTZ63. (KTZ73). |
E916 | DET17. |
E917 | Uniwatt Series double diode triode. 6.3 V, 0.15 A version of DH63. (6T7G) DH73. (DH73 has 5 V heater). |
E918 | Flat cathode X65. |
E919 | Gas rectifier with cold cathode as OZ4G. GR71. |
E920 | 6.3 V, 0.15 A heptode, as 6D8G (X75). (X75 has 15 V heater). |
E921 | 300 Watt triode. |
E922 | Low A/All capacity indirectly-heated diode with 4 V, 0.25 A heater. (What is A/All?). |
E923 | Short System HL2 tungsten filament, non-microphonic (HL21). (HL21 production in 1939). |
E924 | Double L21. |
E925 | Similar to WW313A cold cathode relay valve. (Bell Lab). |
E926 | KTZ41 with shields to pin 3 and cathode to pin 7. |
E927 | 450 Watt air-cooled anode pentode. |
E928 | F.A.C./CAT14. (Is F.A.C. Forced Air Cooled?). |
E929 | F.A.C./CAT12 or CAT12A. |
E930 | Not traced. |
E931 | F.A.C./CAM3. |
E932 | MU12 reduced in size. (DT50). |
E933 | X64 redesigned as 6L7G. |
E934 | EHT rectifier, 20 kV DC output (for television). |
E935 | EHT rectifier. 70 kV DC output (for television). |
E936 | High slope HF tetrode similar to RCA 1851. (Z62). (Z62 1938 production). |
E937 | Special rectifier for GEC television group. (U134). (U134 1939 production). |
E938 | Not traced. |
E939 | ??? SP210. |
E940 | KT34 (tetrode of N34). |
E941 | HL2/K with pinch for Air Force. |
E942 | Forced air cooled CAT6. ACT14. |
E943 | KTZ63 with cathode brought out separately, for Hayes. (A924) (M-OV A924 is double L11). |
E944 | HF VM tetrode, 2 W flat cathode, Es = 100 V. KTW61. (KTW61 1939 production). |
E945 | 6 W cathode KT41. 6.3 V, octal (KT61). (KT61 1939 production). |
E946 | E944 straight-μ. |
| Triode hexode on 8 W cathode for television. (X62) (X62 1939 production). |
E948 | STV75/15. |
E949 | Not traced. |
| |
E950 | KTZ41 with 13 V, 0.45 A heater for HMV. |
E951 | Not traced. |
E952 | STV150/200. |
E953 | As X23 but If = 0.2 Amp. |
E954 | Similar to 6D8G. (X73). (X73 1939 production). |
E955 | 2 V, 0.2 A KT21 = KT24. (KT24 1939 production). |
E956 | 2 V, 0.1 A HD23 = HD24. (HD24 1939 production). |
E957 | A864 with 6.3 V heater. |
E958 | Not traced. |
E959 | Not traced. |
E960 | GEC copper-glass transmitting triode. (Became VT58, CV1058). |
E960T | GEC copper-glass transmitting triode. (Became VT98, CV1669 & CV1098). (Based on ACT10). |
E961 | Not traced. |
E962 | Similar to Taylor 203Z. |
E963 | Electron multiplier. |
E964 | P410 tested for photocell relay work. |
E965 | As E906 but with μ of the order of 17 (to replace E623). |
E966 | KTZ41 with cathode lead brought out to top of the bulb and separate connection to shield and normal cathode connection. |
E967 | Low Is HF VM high slope tetrode, 2 W flat cathode. |
E968 | Not traced. |
E969 | DA41 (DA41 1939 production). |
E970 | 6A6, B63 (B63 not in production). |
E971 | DET18. |
E972 | DET19. |
E973 | Mercury-filled MSP4. |
E974 | Mercury-filled MS4B. |
E975 | Special triode for GEC Television group. |
E976 | E603 with reverse helix heater (X41). |
E977 | Zero bias 250 W triode (DA251). |
E978 | BL62 (double diode triode) (BL62 production in 1939). |
E979 | Not traced. |
E980 | Not traced. |
E981 | Not traced. |
E982 | Guiding grid HF tetrode (Warren) KTZ64. (Should this be gliding grid?). |
E983 | KT63 without suppressor plates (Research). |
E984 | Pentode, as Philips, 1½ times full size. |
E985 | Pentode, as Philips Patent, two times full size. |
E986 | DH63 with μ of 30-35, ra = 18k, for Coventry (DL63). |
E987 | 250 W magnetron. |
E988 | Indirectly heated LS7. |
E989 | As RCA A342 USW double pentode (KT9, now TT9). |
E990 | Battery double diode triode similar to HD23 with 2 V, 0.1 A Series filament. |
E991 | Not traced. |
E992 | Triode hexode with No.17 cathode. (X61) (X61 production in 1940). |
E993 | W30/Catkin in glass (replacement). |
E994 | Not traced. |
E995 | Not traced. |
E996 | Not traced. |
E997 | As E936 but with ring seal. (Z82). |
E998 | Not traced. |
E999 | Not traced. |
| |
E1000 | 1000 V, 250 μA half-wave rectifier (U25). |
E1001 | GEC. Half DET12. Experimental Acorn triode. (For metre). |
E1002 | Modified E855 for use on television (GEC). KT45. |
E1003 | Modified A864 for use on television (GEC), KT13. |
E1004 | Not traced. |
E1005 | X65 with oscillator triode earthed, triode anode floating and injector grid taken to pin 5. |
E1006 | Not traced. |
E1007 | Not traced. |
E1008 | Quick heating MPT42 (directly heated) MWT. |
E1009 | MS4B with separate anode lead i.e. one anode out top of bulb and one through pinch. |
E1010 | Not traced. |
E1011 | 'Micropup' copper-glass triode. (See Micropup Valves). |
E1012 | Not traced. |
E1013 | As Western Electric 4212E. |
E1014 | 6.3 V version of the E886 (KT73) (KT73 has 6 V heater). |
E1015 | Not traced. |
E1016 | Tetrode (PT6). |
E1017 | E923 with L21 characteristics. |
E1018 | E800 with anode on top in place of cathode at top. |
E1019 | U30 on MU12/14 design. |
E1020 | A950 for use at 0.45 A (A1020). |
E1021 | X65 with injector grid disconnected from triode. |
E1022 | Not traced. |
E1023 | Not traced. |
E1024 | GEC. TX copper-glass tetrode. (Became VT114 & CV1114). |
E1028 | Uniwatt Series full-wave rectifier (U72). |
E1046 | GEC. 'Micropup' triode. Became VT90 & CV1090. (Used in AI & ASV). |
| |
E1061 | Not traced. |
E1097 | Half-wave directly heated rectifier. (Became CV1111). |
| |
E1107 | Not traced. |
| Tetrode. (DH80L). |
E1124 | As N82. |
E1130 | GEC. 'Micropup' triode. |
E1132 | Half-wave directly heated rectifier. (Became CV1111). |
E1137 | Indirectly heated grounded anode triode. (Became CV78). |
E1143 | Output beam tetrode. (Became CV1577). |
| RF triode with 6.3 V, 0.2 A heater, gm = 3 mA/V. (Became VR135 & CV6. For RDF & CW). |
E1149 | Glass-metal triode, not traced. |
| |
E1155 | GEC. Copper-glass tetrode modulator. 12 kV, 10 A. (Became NT100 & CV44). |
E1161 | TX triode with 12 V, 10.6 A filament. (Became NT93(97). CV92 & CV1253). (First enlargement of 'micropup'. Also known as 1046B. |
E1164 | RF pentode. Same as EF50. (Became CV1091). |
E1166 | Second enlargement of 'micropup'. Also known as 1046D. |
E1171 | Not traced. |
| VT75. |
E1177 | Not traced. |
E1180 | GEC. Tuning indicator = Mullard EM31. (Became CV1077). |
E1188 | GEC. Randall & Boot cavity S-band magnetron. |
E1189 | GEC. S-band magnetron, 10 cm. Enlarged oxide coated milli-micropup. (Became NT98 & CV1255. For CW). |
E1190 | TX VHF triode with 6.3 V, 2.7 A heater. (Became CV55). |
E1191 | Directly heated thyratron modulator. 15 kV, 200 A, 300 Hz. (Became CV12). |
E1192 | TX pentode. (Became CV1501). |
E1193 | Not traced. |
E1197 | Half-wave mercury-vapour rectifier. (Became CV5 then CV152). |
E1198 | GEC S-band magnetron, 9.1 cm. (Became CV38). |
E1199 | Peak-voltmeter diode. (Became CV7 & CV1405). |
| |
E1207 | Not traced. |
E1209 | Directly heated thyratron triode. (Became CV7). |
E1210 | Glass magnetron, receiving 9.1 cm. |
E1228 | Directly heated, rugged thyratron with wire ends. (Became CV3 for proximity fuse). |
E1229 | Rugged midget pentode with wire ends. (Became CV4). |
E1231 | Indirectly heated VHF concentric triode oscillator with 6.3 V heater. (Became CV52). |
E1232 | GEC oxide coated 'micropup' triode for 80b100 kW at 50 cm. (Became NT99 & CV92). |
E1233 | Magnetron, 10 cm, 50-100 kW. |
E1235 | TX triode with 58 A filament, air-cooled anode, gm = 3 mA/V. (Became CV29). |
E1236 | Magnetron. (Became CV69). |
E1239 | 'Micropup' series with largest oxide-coated cathode. |
E1242 | Pentode. (Became CV1510). |
E1248 | GEC coaxial diode switch. (Became CV8. For 150 cm). |
| |
E1255 | Magnetron, 10 cm, 100-200 kW. (Became CV40). |
E1256 | Magnetron, 9.1 cm, 100-200 kW. (Became CV42). |
E1263 | Not traced. |
E1266 | TX triode with 3.25 V, 6.75 A filament. (Became CV15). |
E1267 | GEC S-band magnetron 10.7 cm, 100-200 kW. (Became CV41). |
E1269 | Not traced. |
E1271 | TX tetrode modulator. (Became CV57). |
E1273 | GEC VHF Axial mixer diode. (Became CV58 & CV258). |
E1274 | All concentric transmitting triode for < 50 cm . |
E1287 | GEC S-Band magnetron. (Became CV23). |
E1289 | Thyratron. (Became CV1148). |
E1290 | Triode amplifier, non-microphonic. |
E1297 | Half-wave mercury-vapour rectifier. (Became CV5). |
| |
E1305 | GEC Grounded grid triode for 200MHz, similar to RL7. |
| Thyratron. |
E1320 | GEC Tuning indicator. (Became CV51). |
E1322 | Experimental high-voltage indirectly heated rectifier. |
E1323 | TX triode with 6.3 V, 0.8 A heater, gm = 6.7 mA/V. (Became CV63). |
E1324 | Magnetron. Not traced. |
E1325 | Magnetron, trapped E1189. (Became CV56). |
E1326 | Magnetron, strapped E1198. (Became CV69). |
E1330 | Directly heated thyratron. (Became CV123 & CV268). |
E1331 | Pentode. (Became CV1510). |
E1335 | Directly heated, high gain midget pentode wire ends. (Became CV61. For Royal Navy Torpedo Factory). |
E1336 | Directly heated rugged, high μ miniature triode for oscillator/receiver. 10 mm diameter. (Became CV122). |
E1337 | TX triode = E1447. CV78. |
E1342 | Magnetron, E1326 with reduced anode length. (Became CV64). |
E1344 | Triode, common grid earthed grid oscillator, double-ended. |
| |
E1355 | Indirectly heated RF pentode for GPO. (KTZ73 with 4 V heater). (Became CV1343). |
E1356 | Indirectly heated diode switch with wire ends. (Became CV8). |
E1359 | Magnetron. See E1325, 25 kV, 2 μs, heavy duty cathode. (Became CV76). |
E1362 | Diode. (Became CV126). |
E1364 | Midget, rugged thyratron,. |
E1365 | Gas-filled resonator spark gap. T/R cell, 3 cm, brass body. (Became CV114). |
E1368 | TX triode with 6.3 V, 0.6 A heater, gm = 5 mA/V. Early design used as CW oscillator. (Became CV90). |
E1365 | GEC X-band TR cell. (Became CV221). |
E1366 | Midget valve for Torpedo School. |
E1368 | CW oscillator triode with 6.3 V, 0.6 A cathode. Common grid earthed anode. (Single-ended E1344. Became CV90). |
E1371 | Noise diode. (Became CV105). |
E1373 | Magnetron similar to E1325/E1359. 8.5 cm. (Became CV99). |
E1374 | Concentric valve for up to 2 GHz. |
E1379 | Glass magnetron. Formerly E1210DE, 6.6 cm. (Became CV79. For MOS). |
E1380 | Glass magnetron. Formerly E1210DE, 6.3 cm. (Became CV89. For MOS). |
E1386 | High-sensitivity output tetrode with 6 W heater, similar to KT61, but with B9G base. |
| |
E1411 | GEC disc-seal triode signal amplifier with 6.3 V, 0.5 A heater. (Became CV153). |
E1414 | As CV153 above. |
E1415 | Slotted disc cell (anti T/R) for 10 GHz. (Became CV115). |
E1416 | Triode hexode frequency changer (X61M). (Became CV281). |
E1417 | Gas discharge cell. (Became CV117). |
E1419 | Triode. Enlarged CV90. (Became CV154). |
E1419 | TX triode with 5.8 V, 0.96 A heater, gm = 10 mA/V. |
E1421 | GEC gas filled coaxial TR switch. |
E1423 | Tetrode. (Became CV406). |
E1425 | Not traced. |
E1426 | Directly heated battery triode. With B4 base. |
E1427 | Not traced. |
E1429 | Magnetron. (Became CV79). |
E1430 | Not traced. |
E1433 | Directly heated power pentode with B5 base. |
E1435 | Not traced. |
E1436 | Regulator tube. 100 V, 1-10 mA. (Became CV188). |
E1440 | Smaller version of CV90, 2 Watt cathode. |
E1441 | Not traced. |
E1442 | Not traced. |
E1443 | Not traced. |
E1444 | Not traced. |
E1445 | Not traced. |
E1446 | Not traced. |
E1447 | Not traced. |
E1448 | Not traced. |
E1449 | Not traced. |
| |
E1450 | Not traced. |
E1453 | Directly heated 4 V triode for GPO. B4 Base. (Became CV1646). |
E1454 | TR cell. (Became CV43). |
E1455 | Not traced. |
E1456 | Not traced. |
E1457 | Disc-seal triode with 6.3 V, 4 A heater, gm = 20 mA/V. 5-10 kW, pulsed. (Became CV257). |
E1458 | TX oscillator triode, as US type 3C27. (Became CV178). |
E1459 | Indirectly heated 12.6 V tetrode modulator. Specially processed CV57. (Became CV174). |
E1461 | Not traced. |
E1462 | Not traced. |
E1463 | Hydrogen-filled thyratron became, 160 kW, 2,500 pps. (Became CV319). |
E1464 | Not traced. |
E1465 | GEC X-band pre-TR cell. (Became CV115 & CV236 although the CV236 is an S-Band device). |
E1468 | Directly heated noise diode. (Became CV172). |
E1472 | Directly heated battery triode with B4 base. |
E1474 | TX triode with 6.3 V, 0.6 A heater, gm = 15 mA/V. As E1337 with a separate cathode. (Became CV78). |
E1477 | Not traced. |
E1480 | Triode (E1419) without internal feedback. |
E1481 | Magnetron. CV64 for higher input. (Became CV192). |
E1482 | EHT rectifier. (Became CV121). |
E1485 | Battery tetrode with B7G base. (Became CV807). |
E1487 | GEC X-band 12-segment strapped magnetron for 10 GHz. (Became CV208). |
E1488 | Cavity Magnetron. (Became CV182). |
E1489 | TW? RF test (on B9). Indirectly heated B9G. |
E1490 | Battery triode with B4 base. |
E1494 | Magnetron. E1487 for higher frequency. (Became CV191). |
E1495 | TX triode with 10 V, 3.4 A heater, gm = 40 mA/V. (Became CV259). |
E1496 | TX triode with 6 V, 17 A heater, air-cooled anode. (Became CV240). |
E1497 | Hydrogen diode for absorbing over-swing energy in a network. (Became CV215). |
E1496 | Air-cooled triode. 1 kW dissipation. |
| |
E1511 | High-power X-Band magnetron. Lower frequency than E1487. (Became CV355 & CV356). |
E1515 | 1.4 V output tetrode with B7G base. |
E1516 | TR Cell. CV114 with shorter discharge gap, wider band, copper body. (Became CV221). |
E1524 | Half-wave argon-filled rectifier with 5 V, 2.3 A heater. Has B8½G base. (Became CV338). |
E1526 | Small 5 kV, 60 mA rectifier. |
E1527 | Became CV290. |
E1531 | X-Band Magnetron. E1494 with coaxial to waveguide feed; limited frequency range. (Became CV214. 9.675 GHz). |
E1532 | Directly heated 2 V triode for GPO. POVT37C. (Became CV1644). |
E1541 | Directly heated 4 V triode for GPO. POVT167. (Became CV1716). |
| |
E1557 | Indirectly heated RF tetrode with top cap. |
E1558 | Indirectly heated RF tetrode. |
E1560 | Re-design of E1498. |
E1561 | Tuning indicator with B7G base. |
E1563 | Full-wave rectifier. (Became CV1863). |
E1568 | Indirectly heated tetrode with B7G base. |
E1579 | Re-design of CV121-E1842 with new filament structure. |
E1591 | Double triode. (Became CV181). |
E1592 | Directly heated battery triode with B4 base. |
E1599 | DET22 disc-seal triode. (Became CV273). |
| |
| Double triode with 6.3 V, 0.6 A heater, gm = 2.6 mA/V. Used for AF amplifier. Has a separate cathode systems. Mounted on IO base and is similar to 6SN7GT. (Became CV278) (The museum sample identifies as a B65). |
| Triode with B7G base. Used as oscillator up to 400 MHz. (The museum sample identifies as an L77). |
E1633 | Gas modulator. (Became CV456). |
E1647 | TX triode. (ACT23). (Became CV288). |
E1648 | Half-wave rectifier on B7G base. (Became CV135). |
| |
E1659 | Heptode frequency changer. (Became CV453). |
E1660 | RF pentode on B7G base. |
E1662 | Output pentode with 6.3 V, 0.2 A heater, gm = 2.6 mA/V, Po = 2.5 W. |
E1662 | Indirectly heated AF pentode with B7G base. |
E1682 | As U74 with tubular bulb. |
E1698 | TX type for RF amplifier or multiplier. |
E1694 | TX RF amplifier. |
| |
E1706 | RF tetrode with 6.3 V, 1.5 A heater, gm = 13 mA/V. Became CV437. |
| Single diode. (Possibly half of 6AL5). |
E1709 | Double triode with 6.3 V, 0.3 A heater, gm = 1.3 mA/V. |
E1714 | Triode designed on planar system for U.S.W. work as in TV receivers. B7G base. (Became CV408). |
E1716 | Indirectly heated triode with B7G base. |
| Indirectly heated full-wave rectifier with B8½G base. (The museum sample has a plastic spigot, Loctal B8G has metal spigot). |
E1739 | Battery hexode with top cap. 8OL. (Is 8OL Loctal?). |
E1744 | KT61 characteristics in 270m bulb. |
| |
| Battery heptode with two top caps. 1.4 V filament. 8OL. |
E1753 | TT15 twin beam RF tetrode (CV415). |
E1769 | DET24 disc-seal triode for use as oscillator. (Became CV397). |
E1787C | RF pentode with 6.3 V, 1 A heater, gm = 8 mA/V. |
E1793 | Triode hexode frequency changer with 19 V, 0.1 A heater, gm = 0.65 mA/V. |
E1793 | Triode hexode on B8½G base. Normally in metal can. (What is B8½G base? Possibly B8B with plastic spigot). |
E1794 | VM RF pentode with 19 V, 0.1 A heater, gm = 2.8 mA/V. |
| Half wave rectifier. The heater is 50 V 100 mA. (Became U101). |
| Museum sample also marked as KT101. |
| |
E1810 | Battery output pentode. B7G base. (N17). |
E1813 | Double diode triode with B8½G base. For series operation at 0.1 A. |
E1816 | (N17) Battery output pentode with B7G base. |
E1817 | Indirectly heated RF pentode (as W61) with B8A base. |
E1818 | X61 with B9A base. |
E1819 | Indirectly heated double diode tetrode with B7G base. |
| The museum sample looks to be a battery pentode with an IO base. |
| RF disc seal tetrode. |
E1834 | Double triode as US type 6AS7G for TV scan booster. |
E1841 | A1841 hexode. |
E1843 | Indirectly heated swinging cathode frequency changer. B8½G of E1659 (6BF6). |
| |
E1860 | TX triode. Became CV240. |
E1874 | Triode hexode frequency changer. |
E1887 | Based on U33. Used as a high-vacuum rectifier as voltage-doubler. B4 base anode to top. |
E1892 | Electrometer with 1.4 V, 100 mA filament. 8OL. |
E1898 | Forced air cooled HW rectifier. |
| |
E1900 | (U35) rectifier for 8 kV, 2 mA pulse drive. |
E1923 | Electrometer with 1.4 V, 50 mA filament. 8OL. |
E1927 | Sub-miniature type for hearing aid equipment and wire ends. |
E1928 | As E1927. |
E1929 | Indirectly heated RF pentode (B79). |
E1933 | As E1927. |
E1935 | Modified TT15 with lower anode-cathode capacity for 160 MHz. CV415. |
E1938 | Full-wave rectifier. (Became CV493). |
E1945 | Earlier electron multiplier with B7G base. Now obsolete. |
| |
E1954 | Directly heated output valve. Wa = 75 W. (Became CV25). |
E1955 | Xenon filled tetrode. (Became CV797). |
E1956 | High voltage rectifier, 5 kV, 5 mA with B7G base. (Became CV261). |
E1959 | Electrometer triode. (Became CV495). |
E1968 | Same as E1709 but with 19 V, 0.1 A heater rather than 6.3 V. |
E1984 | Output pentode with 6.3 V, 0.64 A heater. (N78). |
| Triode hexode on a B7G base. |
| Half wave rectifier on a B7G base. |
E1987 | High slope output pentode. |
E1996 | UHF disc-seal triode for GPO. (Became CV436). |
| |
| Half-wave rectifier (U41). (Became CV2115). |
| Pentode on a B7G base. |
E2111 | AF triode pentode with Noval base. |
E2016 | Battery RF pentode. (Became CV1758). |
E2018 | Indirectly heated RF pentode. (Became CV454). |
| Indirectly heated pentode on B7G base. |
| Indirectly heated pentode on B7G base. Also marked W77. |
| |
| Indirectly heated straight pentode on B7G base. |
E2095 | Output pentode. (Became CV471). |
| |
E2122 | U78 bi-phase rectifier. |
E2129 | Twin triode with Noval base. |
E2133 | High slope electron multiplier. (Became CV2276). |
E2134 | High slope output pentode with 6.3 V, 0.6 A heater. (Became CV2179). |
| KT31 (B7 base) fitted with an IO base cap. |
E2149 | UHF twin pentode. |
| |
E2153 | High slope pentode with 6.3 V heater. |
E2172 | Half-wave rectifier for AC/DC with B7G base. |
| Single diode triode. Visually identical to DH77. 12.6 V heater. |
E2163 | Double triode. (Became CV491). |
E2164 | Double triode. (Became CV492). |
E2177 | Similar to U107 HW rectifier but 13 V, 0.3 A heater. |
| U309 half-wave rectifier with Noval base. |
E2179 | Output pentode with top cap for TV. |
| Indirectly heated triode with IO base cap. |
| Hexode with B7G base. |
| Indirectly heated audio pentode with IO base. (Became Z63). |
E2196 | Triode. (Became CV3920). |
E2198 | Similar to E2177 but with Noval base. |
| |
E2201 | 6 W output pentode. |
E2206 | RF pentode similar to Z77 with Noval base. |
E2209 | Double diode RF pentode. |
| ?Gas filled sensor with IO base. |
| Double triode with 13 V heater on B7G base. |
E2221 | Pentode. (Became CV2277). |
E2244 | Tetrode. (Became CV321). |
| |
E2266* | Pulse modulator. (Became A2266 and CV2231). |
E2720 | Became CV5747. |
E2788F | Triggered diode. (Became CV5405). |
E2792 | (Became CV6097). |
| |
| Indirectly heated pentode with B7G base. |
| Indirectly heated hexode with B9A base. Heater is 6.3 V at 0.3 A. (Became X719?). |
| |
| Indirectly heated frame grid triode with B7G base. (Became A2521). |
| Indirectly heated triode pentode with B9A base. ?100 mA heater. |
| Indirectly heated frame grid triode with B9A base. (Became A2599). |
| |
| Half wave rectifier with cathode to top cap - TV efficiency diode. IO base and heater 20 V at 300 mA. |
| Triode pentode for series heater chains with B9A base. |
| EHT rectifier with B9A base. Heater 6.3 V. |
| |
| Disc seal triode. |
| |
E2801 | (Became CV5363). |
E2811 | TR device. (Became CV5210). |
E2815 | Pulse attenuator. (Became CV5315). |
| |
E2908 | Triode. (Became CV5326). |
E2975 | Low-noise RF triode. (Became CV4120). |
E2978 | Voltage stabiliser. (Became CV5298 & CV6129). |
| |
E3084 | TWT. (Became CV6208). |
| |
| Line output valve on IO base. |
