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Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

40
Triode

UX4
CV2501

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

401
Triode
1925

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4011A
Triode

CV1415

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4017B
Rectifier HW

CV1446

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4019B
Double Triode

AR11 CV1309

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

401A
Cathode-Ray Tube
1936
B9
CV320 CV950 E4103/B/4 NC1

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

401D
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

402P
Output Triode
1934
B7

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

402PenA
Pentode
1938

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4020
Triode

AR12 CV1310

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4020A
Triode

UV The Shaw Base
3A/108A AR12 CV1653 POVT73

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4020B
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4020C
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4021B
Triode

AR20 CV1316

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4022AR
Triode
1925
UV The Shaw Base
AR13 CV1311

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4022B
Triode
1925

AR13 CV1311

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4030C
Water Cooled Power Triode
1938

3Q/292E

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4030D
Water Cooled Power Triode
1938

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4033A
Triode

B5
3B/102B CV84 CV1220 NT37

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4033L
Triode

3033A 3B/252B 3B/303A 4033A CV1220 CV1688

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4039A
Triode Thyratron
1937
B5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

403B
UHF Pentode
1947

5591

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4043
Triode (selected 5876)

5876

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4043C
Triode

3B/350A CV1448

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4045A
Pentode
1937
B5
CV243 POVT145

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4046A
Pentode

CV244 MS/Pen

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4049
Rectifier HW

CV1355 ESU300

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4049A
Rectifier HW

CV1471

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4049D
Rectifier (MV)

AH221

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4051
Cathode-Ray Tube
1938

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4052A
Pentode
1938
UX5
CV1081

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

405/BU
Rectifier FW (EHT)
1937
B4
CV2640

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

405OR
Photocell

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4061A
Pentode

5B/100A ATP10 CV1369 RK25

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4064B
Rectifier HW

872 872A AH217 CV642 CV1449 ESU872

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4066A
Pentode

7A3 ARP25 CV1181 KT41 NR59 PenA4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

406D(While Line)
Detector Triode
1926

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

406H(Red Line)
RF Triode
1926

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

406L(Green Line)
AF Triode
1926

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

406RC(Blue Line)
RCC Triode
1926

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4067
Pentode
1957

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4069A
Pentode

ATP100 CV1372

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4074A
Double Triode

UX7
2C34 CV18 CV1061 DET19 RK34 TV03-10 VT-224 VT61 VT61

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4074B
Double Triode

CV1573 VT61A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

408A
Cathode-Ray Tube
1936

E4103/E/4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

408BU
Rectifier FW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

40CB4
Cathode-Ray Tube

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

40KD6
Beam Tetrode
1967
B12C

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

40PPA
Pentode
1934

7D3

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

40SUA
Rectifier HW
1934
B5
1D5 C108 CV1267 RZ U4020 UR1C V20

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41
Output Pentode
1936
UX6
CV608

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4101D
Triode
1925
UV The Shaw Base
101D CV1638 POVT31 SY4101D

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4101DS
Triode

UV The Shaw Base
101DS

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4101E
Triode
1925
UV The Shaw Base
101E CV1639 POVT31B

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4102D
Triode
1925
UV The Shaw Base
102D POVT32

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4104D
Triode

104D SY4104D

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4104E
Triode

UV The Shaw Base
104E

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

410LF
Triode
1927

CV1152 L410 NR15A PM4DX

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

410LFT
Triode

B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

410PT
Pentode
1932

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

410RC
Triode
1927

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4120
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

412BU
Rectifier FW
1929
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

412SU
Rectifier HW
1930

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4152
Thermal Delay Switch
1954

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

417
Klystron

IO
WL-417

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

417A
Klystron

IO
2K41 CV2642 VT-277 WL-417A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

417A/5842
Triode

5842 CV3789

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41E
Output Pentode
1936
UX6
CV608

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41FP
Triode

CV2502 CV2509

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MDG
Bi-Grid
1932

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41ME
Tuning Indicator
1938

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MH
Triode
1930
B5
CV2503

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MHL
Triode
1930
B5
354V A30D AC/HL CV2504 D4 HLA2 MH4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MLF
Triode
1929

CV1038 MHL4 NR26 VR38

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MLT
Triode

CV1117 VR117

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MP
Triode
1929
B5
CV1458

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MPG
Heptode
1934
B7
15A2 A80A CV2505 CV3576 FC4 MH4105 MX40 V04 VHT4 X42

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MPT
Pentode
1937

CV2506

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MTA
Triode
1937
B5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MTB
Triode
1937

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MTL
Triode
1937
B5
904V AC2/HL CV1117 HLA2 MH41 VR117

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MTS
Split Anode Pentode
1937
B7

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41MXP
Triode
1929

054V ACP1 CV1122 LL4 PA1

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

41STH
Triode Hexode
1936
B7
20A1 A36A AC/TH1 CV2508 TH4 X41M

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42
Output Pentode
1936
UX6
42E CV609

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42-OT/DD
Double Diode Beam Tetrode
1937
B7
CV2512

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

420LFR
Triode

B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4205E
Triode
1937

3B/151A CV1648 M4205E

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4212D
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4212E
Triode

3C/270A CV1252 CV1619 NT92

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4215A
Triode
1923
Peanut
H125 Wecovalve

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4242A
Triode
1938
211 242C CV25 ES85 UE311

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

425Pen
Pentode
1929
B4
Pen425

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

426
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4261
Thyratron (Mercury Vapour)

5557

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4270A

CV30

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4274A
Rectifier FW

UX4
22S/200A 274A CV1451

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4279A

279A CV669

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4282
Beam Tetrode

CV1365

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4282B
Beam Tetrode

ATS70

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42E
Output Pentode
1936
UX6
42E CV609

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42EC4A
Efficiency Diode
1967
B9D
PY500A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42MP/Pen
Pentode
1934

7A3 A70C AC2/Pen CV1181 KT41 N41 PT4 PenA4 TL44

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42MPT
Pentode
1937

ARP7 CV1325

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42OT
Pentode
1937
B7
CV2511

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42PAY
Pentode

CV2513

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42PTB

1937

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

42SPT
Pentode
1937
B7
CV1444

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

43
Output Pentode
1932
UX6
A2543 CV2514 ER43

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4300A
Triode
1938
UX4
300A 300B 3B/170A 3B/400A 4275A CV1452

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4304
Triode

CV2759

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4304BB
Triode

B4
CV2761

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4304CB
Triode

B4
8019 BW11 CV315 CV1062 CV1252 CV1288 CV1619 DET12 NT58 TSW50/A TY1-50 VT62

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4307A
Pentode

CV1080

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4313C
Thyratron
1945
B4
313C 3313C CV75 G150/1A PTT3003

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4316A
Triode

316A CV683 CV2762

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4317
Voltage Stabiliser

CV1201

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4328A
Pentode

UX6
328A CV2619

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4328D
Pentode

IO
CV245

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4357A

CV27

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

436A
Pentode
1960

A2674

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

43E
Output Pentode
1937
UX6
CV2514

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

43IU
Rectifier FW
1937
B4
1561 1821 1867 1867 441U 442BU 460BU 506BU A11B A11C A11D APV4 APV4 CV1039 CV3760 DW2 DW4-500 DW4/350 IW4-350 IW4-500 MU12 MU14 R1 R2 R3 R42 R4A U10 U12 U14 UU120/350 UU120/500 UU60/250

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

43U
Rectifier FW

CV1039 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4415
Camera Tube (Image Orthicon)

P875

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4416
Camera Tube (Image Orthicon)

P891

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

442BU
Rectifier FW
1931
B4
CV1796 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

445
Rectifier FW
1931
UX4
145 ER45 G45 PM245 UX245 l45

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

446A
Triode

IO
CV932 GL446A

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

446B
Triode

2C40 CV687

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4478
Camera Tube (Videcon)

P826/4478

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4493
Camera Tube (Videcon)

P893/4493

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4494
Camera Tube (Videcon)

P894/4494

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4495
Camera Tube (Videcon)

P894/4495

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

44A/160M
Double Beam Tetrode

CV415 TT15

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

44-IU
Rectifier FW
1937

CV1039 UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

44-SU
Rectifier HW
1930
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45-IU
Rectifier FW
1939
B4
CV2529 FW4-500

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45
Output Triode
1929
UX4
245 345 CV610 UX245

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

451

CV3585

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

451PT
Pentode
1947

45A5 N142 UL41

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4536
Image Orthicon
1962
4492 4492V1 4492V2

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45A5
Pentode
1947

451PT CV1977 N142 UL41

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45B5
Pentode

10P18 N119 UL84

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45IU
Rectifier FW
1939

AU1 CV1264 CV2529 FW4-500 NU12 U18/20

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45Z3
Rectifier HW
1940

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

45Z5GT
Rectifier HW

CV2530

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

46
Dual Grid Amplifier
1933
UX5
CV2531

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

460BU
Rectifier FW
1931

UU5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4643
Triode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

464A
Triode

2C43 CV688

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4662
Tuning Indicator
1934

3184

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4671
Triode

1650+D2805 5731 955 E1C

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4672
Acorn Pentode

954 E1F ZA2

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4674
Diode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4675
Triode

A40 AT4 Z1

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4676
Pentode

A41 AP4 Z2+D2676 ZA1

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4685
Pentode

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4687
Pentode
1937
Ct8

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4687A
Pentode
1937
B4

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

4699
Pentode

EL54

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

47
Output Pentode
1936
UX5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

47E
Output Pentode
1936

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

48
Pentode
1936

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

484LFU398
Rectifier

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

484V
Triode
1931
B5

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

485
Triode
1940

Type
Structure
Date
Base
PDF
Sensibly equivalent^¶ to:

49
Pentode
1935
UX5
CV2532

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