Radio Valve Data: 1915-1960

Keith R Thrower OBE, The Valve Museum, April, 2022.

Triode Receiver Valves (pre-1926)^*

Type or
Trademark

Filament

Anode

Grid

r_a

g_m

μ

Year

Base

Notes
and applications

^{(1)The letters indicate the three types of filaments found on these valves. B = bright emitter, D = dull emitter, O = oxide-coated.}

Volts

Amps

Volts

-Volts

kΩ

mA/V

^{(2)The year shown is when it is believed the type was first issued. This date is accurate for most types but cannot be guaranteed for them all.}

^{(3)Pin-out details for non-exhibits can be found with the base details.}

  ^{★This table lists valves that were manufactured in the UK or which were claimed to be of UK manufacture. In practice several of the smaller companies imported their valves from abroad.}

 RAF

C

B

5.0

0.75

30-70

22.0

0.28

6.2

1918

I/S1

General purpose

D

B

5.0

0.46

28

1919

I/S1

Soft, for detector

V.R.12B = D.E.3

D

1.8

0.40

B4

V.R.12C

D

1.8

I/S2

V.R.12F

D

1.8

B4

V.R.12X

D

1.8

B4

V.R.14A

D

2.8

I/S1

Similar to D.E.3

UK Government Valves

Type

Commercial Equivalents

Filament

Description & Comments

Base

Volts

Amps

Type

Ref

 RAF

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless

VI77 = CV1077

EM31 (Mul)

6.3

0.20

Tuning indicator

IO

46

VI103 = CV1103

Y63 (MOV)

6.3

0.30

Tuning indicator

IO

46

VR17 = CV1017

2.0*

0. 067

Low-μ triode

B4

1

VR18 = CV1018

215 SG (Cos)

2.0*

0.15

RF tetrode

B4+tc

B

VR19 = CV1019

215P (Cos)

2.0*

0.15

Output triode

B4

1

VR20 = (CV1020)

220P (Cos)

2.0*

0.20

Output triode

B4

1

VR21 = CV1021

210 LF (Cos)

2.0*

0.10

Detector or AF triode

B4

1

VR22 = CV1022

220PA (Cos)

2.0*

0.20

Output triode

B4

1

VR23 = CV1023

230XP (Cos)

2.0*

0.30

Output triode

B4

1

VR23A = CV1565

2.0*

0.30

Selected VR23

B4

1

VR25 = CV1025

DET 25 (MWT)

7.5*

1.28

Small transmitting triode

L4

1

VR26A = CV1568

4062A (STC)

12.0*

1.85

Small transmitting triode (7.5MHz max.). Thoriated

L4

1

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR27 = CV1027

2.0*

0.10

Selected VR21

B4

1

VR28 = CV1028

220VSG (Cos)

2.0*

0.20

VM RF tetrode

B4+tc

2

VR32 = CV1032

220B (Cos)

2.0*

0.20

Class B double triode

B7

10

VR35 = CV1035

QP21 (MOV)

2.0*

0.40

QPP double pentode

B7

11

VR37 = CV1037

MH4 (MOV)

4.0

1.00

AF triode

B5

1

VR38 = CV1038

MHL4 (MOV)

4.0

1.00

AF triode

B5

1

VR40 = CV1040

PP5/400 (Maz), PX25 (MOV), DO24 (Mul)

4.0*

2.00

Output triode

B4

1

VR41 = CV1041

PM12M (Mul)

2.0*

0.18

VM RF tetrode

B4+tc

2

VR43 = CV1043

210PG (Cos)

2.0*

0.10

Heptode FC

B7+tc

1

VR44 = CV1044

210DDT (Cos), HL21DD (Maz)

2.0*

0.10

Double diode triode

B5+tc

5

VR45 = CV1045

X56 (MOV)

2.0*

0.44

Triode

B4

1

VR49 = CV1049

210SPT (Cos)

2.0*

0.10

RF pentode

B7+tc

4

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR53 = CV1053

EF39 (Mul)

6.3

0.20

VM RF pentode

IO+tc

8

VR54 = CV1054

EB34 (Mul)

6.3

0.20

Double diode

IO

53

VR55 = CV1055

EBC33 (Mul)

6.3

0.20

Double diode triode

IO+tc

29

VR56 = CV1056

EF36 (Mul)

6.3

0.20

Pentode

IO+tc

8

VR57 = CV1057

EK32 (Mul)

6.3

0.20

Octode FC

IO+tc

1

VR57A = CV1570

EK32 (Mul)

6.3

0.20

Similar to VR57

IO+tc

1

VR59 = CV1059

HA2 (MOV), 4671 (MOV), 955 (RCA)

6.3

0.15

Acorn triode

5AA

1

VR65 = CV1065

SP41 modified (Maz)

6.3

0.63

RF pentode (Effectively SP61)

MO+tc

11

VR65A = CV1574

SP41 (Maz)

4.0

0.95

RF pentode

MO+tc

11

VR66 = CV1066

P41 modified (Maz)

6.3

0.64

Timebase triode (6.3V heater)

MO

16

VR67 = CV1067

L63 (MOV)

6.3

0.30

General-purpose triode

IO

20

VR78 = CV1078

D1 (Maz)

4.0

0.20

VHF diode

B3G

1

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR82 = CV1082

220TH (Cos)

2.0*

0.20

Triode heptode FC

B7+tc

34

VR83 = CV1083

210VPT (Cos), VP21 (MOV)

2.0*

0.10

VM RF pentode

B7+tc

4

VR91 = CV1091

EF50 (Mul)

6.3

0.30

VHF pentode

B9G

1

VR91A = CV1578

6.3

0.30

Selected VR91

B9G

1

VR92 = CV1092

EA50 (Mul)

6.3

0.15

VHF diode

B3G

1

VR95 = CV1095

ZA2 (MOV), 4672 (Mul), 954 (RCA)

6.3

0.15

Acorn pentode

7AA

1

VR95A = CV1579

6.3

0.15

Selected VR95

7AA

1

VR99 = CV1099

X66 (MOV)

6.3

0.34

Triode hexode FC. Similar to X65. To operate with heater range of 5.7 to 7.5V

IO+tc

3

VR99A = CV1581

ECH35 (Mul)

6.3

0.30

Triode hexode FC (unmetallised)

IO+tc

3

VR100 = CV1100

KTW62 (MOV)

6.3

0.30

VM RF tetrode

IO+tc

9

VR101 = CV1101

MHLD6 (MOV)

6.3

0.65

Double diode triode

IO+tc

29

VR102 = CV1102

BL63 (MOV)

6.3

1.30

Double triode

IO+tc

28

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR106 = CV1106

9D2 (BRI)

13.0

0.20

VM RF pentode

B7+tc

6

VR106A = CV1598

9D2 (BRI)

13.0

0.15

VM RF pentode (reduced heater current)

B7+tc

6

VR107 = CV1107

15D2 (BRI)

13.0

0.15

Heptode FC

B7+tc

2

VR107A

Probably 15D2

-

-

VR108 = CV1108

8D2 (BRI)

13.0

0.20

RF pentode

B7+tc

6

VR108A = CV1599

8D2 (BRI)

13.0

0.15

RF pentode (reduced heater current)

B7+tc

6

VR109 = CV1109

4D1 (BRI)

13.0

0.20

Medium-μ triode

B7+tc

23

VR109A = CV1000

4D1 (BRI)

13.0

0.15

Medium-μ triode (reduced heater current)

B7+tc

23

VR116 = CV1116

V872 (Maz)

6.3

0.63

RF pentode

MO+tc

11

VR117 = CV1117

41MTL (Cos)

4.0

1.00

Medium-μ triode

B5

1

VR117A = CV1584

41MTL (Cos)

4.0

1.00

Selected VR117. Va max = 1400V

B5

1

VR118 = CV1118

PT2 (Fer), KT2 (MOV)

2.0*

0.20

Output beam tetrode or pentode

B5

6

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR119 = CV1119

DDL4 (Cos)

4.0

0.75

Double diode

B5

3

VR122 = CV1122

41MXP (Cos)

4.0

1.10

Output triode

B5

1

VR123 = CV1123

EF8 (Mul) = CV1713

6.3

0.20

Low-noise VM pentode with additional aligned grid

Ct8+tc

11

VR124 = CV1124

MS/Pen (Cos)

4.0

1.00

RF pentode

B7+tc

5

VR125 = CV1125

MS/PenB (Cos)

4.0

1.00

RF pentode

B7+tc

6

VR126 = CV1126

4SH (Cos)

4.0

1.00

Hexode

B7+tc

49

VR129 = CV1129

MS/Pen T (Cos)

4.0

1.00

RF pentode

B7+tc

5

VR130 = CV1130

HL23 (Maz)

2.0*

0.05

Medium-μ triode

MO

2

VR130A = CV1586

HL23 (Maz)

2.0*

0.05

Medium-μ triode

MO

2

VR135 = CV1135

E1148 (MOV)

6.3

0.21

VHF triode (300MHz max).

IO+2tc

49

VR136 = CV1136

RL7 (Mul)

6.3

0.30

VHF pentode (300MHz max.)

B9G

2

VR137 = CV1137

RL16 (Mul)

6.3

0.43

VHF triode (300MHz max.)

B9G

3

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VR502 = CV1502

KT32 (MOV)

26.0

0.30

Output beam tetrode

IO

36

VR503 = CV1503

KT33C (MOV)

13.0

0.60*

Output beam tetrode

IO

73

VR505 = CV1505

MH41 (MOV)

4.0

1.00

High-μ triode

B5

1

VS68 = CV1068

STV280/40 (MOV)

Cold

Gas-filled voltage stabiliser. 70V. 140V. 210V, 280V, 60mA max

B5

15

VS69 = CV1069

STV280/80 (MOV)

Cold

Voltage stabiliser. 73V, 143V, 205V, 282V, 80mA max

B5

15

VS70 = CV1070

7475 (Mul)

Cold

Gas-filled voltage stabiliser. 100V, 4mA nominal

B4

12

VS110 = CV1110

S130 (Cos)

Cold

Gas-filled voltage stabiliser. 120V, 6-75mA

B4

12

VS110A = CV1582

Selected VS110)

-

-

VT20 = CV1020

220P (Cos)

2.0*

0.20

Output triode

B4

1

VT23 = CV1023

230XP (Cos)

2.0*

0.30

Output triode

B4

1

VT23A = CV1565

Selected VT23

2.0*

0.30

Output triode

B4

1

VT25 = CV1025

DET25 (MWT)

7.5*

1.00

TX triode (15MHz max)

L4

1

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VT25A = CV1567

DET25 (MWT), 2C25 (US)

7.5*

1.00

TX triode (15MHz max)

L4

1

VT26 = CV1026

12.0*

1.80

TX triode (100W)

L4

1

VT26A = CV1568

4062A (STC)

12.0*

1.85

TX triode (7.5MHz max)

L4

1

VT30 = CV1030

4060A (STC)

12.5*

6.30

TX triode (20MHz max)

None

-

VT31 = CV1031

SG250 (MUL)

11.25*

8.00

TX tetrode

None

-

VT34 = CV1034

DET3 (MWT)

15.0*

4.00

TX triode

None

-

VT45 = CV1045

X56

2.0*

0.44

RF triode (20MHz max.)

B4

1

VT46 = CV1046

PT25H (MOV)

4.0*

2.00

RF triode (20MHz max.)

B5

6

VT47 = CV1047

TZ05-20 (Mul), VLS417 (STC)

6.0*

1.10

TX triode (20MHz max.). Special low-loss base

B4

1

VT50 = CV1050

HL2k (MOV)

2.0*

0.10

Detector or AF triode

B4

1

VT51 = CV1051

Pen220A (Maz)

2.0*

0.20

Output pentode

B5

6

VT52 = CV1052

EL32 (Mul)

6.3

0.20

Output pentode

IO+tc

9

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VT58 = CV1058

E960 (MWT)

12.6*

58.00

TX triode (250MHz max.) Metal-glass construction. Tungsten filament

-

-

VT58A = CV1571

As above

-

-

VT60 = CV1060

807

6.3

0.90

Beam tetrode (120MHz max.)

USM5+tc

6

VT60A = CV1572

807

6.3

0.90

USM5+tc

6

VT61 = CV1061

DET19 (MWT), RK34 (Raytheon), 4074A (STC)

6.3

0.80

TX double triode (125MHz max.) ceramic base

USM7+2tc

12

VT61A = CV1573

TV03-10-modified (Mul)

12.0

0.44

TX double triode (75MHz max.) Change of heater voltage

B5

20

VT61B = (CV18)

DET19 (MWT), RK34 (Raytheon), 4074A (STC)

6.3

0.80

TX double triode (75MHz max.)

USM7+2tc

12

VT62 = CV1062

DET12 (MWT), TY1-50 (Mul)

7.5*

3.25

RF oscillator or amplifier triode

B4+2tc

16

VT73 = CV1073

H63 (MOV)

6.3

0.30

Triode

IO+tc

18

VT74 = CV1074

KTZ63 (MOV)

6.3

0.30

RF tetrode

IO+tc

9

VT75 = CV1075

KT66 (MOV)

6.3

1.27

Output beam tetrode

IO

36

VT75A = CV1576

KT44T (MOV)

4.0

2.00

Output beam tetrode

B7+tc

37

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VT75B = CV1577

KT44 (MOV)

4.0

2.00

Output beam tetrode

B7+tc

37

VT76 = CV1076

DA41 (MOV)

7.5

3.10

Power triode

USM4b+tc

20

VT79 = CV1079

KT8 (MOV)

6.3

1.27

TX VHF tetrode (65MHz max.)

B5+tc

2

VT80 = CV1080

4307A (STC)

5.5*

1.00

TX pentode (10MHz max.)

B7

55

VT81 = CV1081

4052A (STC)

7.5*

3.00

TX pentode (60MHz max)

USM5+tc

8

VT88 = CV1088

832 (RCA)

12.6

0.80

TX double tetrode (200MHz max.) Doorknob

7-pin+2tp

-

VT89 = CV1089

TV03-10A (Mul)

6.3

0.90

TX double triode

B5

20

VT90 = CV1090

E1046 = CV62

8.25*

7.00

Triode micropup (300MHz max.) Thoriated filament

None

-

VT93 = CV1093

5.8*

4.30

TX triode (max. 6MHz) Special low-loss base

4-pin

-

VT94 = CV1094

5.8*

1.43

TX triode (40W)

L4

1

VT96 = CV1096

5B/502A (STC)

12.0*

2.00

TX pentode (20MHz max.). Thoriated, ceramic base.

USM5+tc

8

VT98 = CV1098

E960T (MWT)

35.0*

8.25

Copper-glass TX triode (250MHz max.). Thoriated replacement for VT58. Used in CHL TX

None

-

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VT98A = CV1580

E1325 (MWT)

37.0*

8.25

As above

None

VT104 = CV1104

PT15

6.0*

1.30

TX pentode

B5+tc

14

VT105 = CV1105

ML6 (MWT)

6.0

0.70

TX pentode. Ceramic base

B5

1

VT106 = CV1106

9D2 (Brimar)

13.0

0.20

Variable-μ RF pentode

B7+tc

8

VT106A

As above

13.0

0.20

-

-

VT114 = CV1114 10E/168

E1024 (MOV)

10.0*

70.00

TX tetrode. Metal-glass construction. Thoriated (60MHz max.)

-

-

VT114A = CV1583

As above

-

-

VT118 = CV1018

215SG (Cos)

2.0*

0.15

RF tetrode

B4+tc

2

VT127 = CV1127

Pen46 (Maz)

4.0

1.75

Beam power tetrode

MO+tc

14

VT501 = CV1501

E1192 (MOV)

6.3

0.80

Beam power tetrode

IO

53

VT501A = CV1002

As above

-

-

VT506 = CV1506

5C/450A (STC)

10.0*

13.00

Tx pentode. Thoriated (20MHz max.)

USL4+2tc

-

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VT509 = (CV62)

E1046 (MOV)

8.25*

7.00

Micropup triode (300MHz max.)

None

-

VT510 = CV1510

Replaced CV309 (QVO4-7)

6.3

0.60

Beam power tetrode (60MHz max.)

B9G

6

VT513 = (CV44)

E1155 (MWT)

8.0

6.00

RF tetrode. Metal-glass construction

-

-

VU33 = CV1033

2.0*

0.40

Diode

B4

32

VU39 = CV1039

44IU (Cos), UU5 (Maz), MU12/14 (MOV), IW4 (Mul)

4.0

2.50

Full-wave rectifier

B4

14

VU39A = CV1569

4.0

2.30

Full-wave rectifier

B4

14

VU64 = CV1064

U12/14 (MOV)

4.0*

2.50

Full-wave rectifier

B4

5

VU71 = CV1071

U52 (MOV), 5U4G

5.0

3.00

Full-wave rectifier

IO

60

VU71A

As above

5.0

3.00

As above

IO

60

VU72 = CV1072

GU50 (MWT), GU5 (MOV), RG1-240 (Mul)

4.0*

3.00

Mercury-vapour half-wave rectifier

B4+tc

6

VU111 = CV1111

V1907 (Maz)

4.0*

1.00

EHT half-wave rectifier

B4+tc

6

VU113 = CV1113

U17 (MOV)

4.0*

1.00

EHT half-wave rectifier

B4+tc

6

Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others

VU120 = CV1120

SU2150A (Cos)

2.0

1.50

EHT half-wave rectifier

B4+tc

17

VU133 = CV1133

V960 (Maz)

4.0

1.35

EHT half-wave rectifier

B4+tc

17

VU134 = CV1134

HVR2 (Mul)

4.0

0.65

EHT half-wave rectifier

B4+tc

17

VU508 = CV1508

V1913 (Maz)

4.0*

3.00

EHT half-wave rectifier

B4+tc

6

VW36 = CV1036

220.PA (Cos)

2.0*

0.20

Selected VR22

B4

1

VW42 = CV1042

210LF (Cos)

2.0*

0.10

Selected VR27

B4

1

VW48 = CV1048

215SG (Cos)

2.0*

0.15

Selected VR18

B4+tc

2