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.}

 Western Electric and STC

101D, 101DW, 101E, 208A, 4101

O

4.4

0.97

160

14

6.0

1.00

6.0

1919-1925

UV

Telephone repeaters

209A, 4102D, 4102E

O

2.0

0.97

130

1.5

60.0

0.50

30.0

1919-1925

UV

Telephone repeaters

P.A.4

O

4.0

0.90

100-160

5-15

5.5

1.00

5.5

1925

B4

Output

Wecovalve-A

O

0.8-1.1

0.25

15-60

25.0

0.22

5.5

1923

Peanut

General purpose

Wecovalve-B

O

0.8-1.1

0.25

15-60

25.0

0.22

5.5

1924

B4

General purpose

Weco (gn. spot)

O

0.8-1.1

0.25

30-60

7-10

25.0

0.22

5.5

1925

Peanut

Detector

Weco (or. spot)

O

0.8-1.1

0.25

15-30

3-5

25.0

0.22

5.5

1925

or

AF amplifier

Weco (red spot)

O

0.8-1.1

0.25

30-60

3-5

25.0

0.22

5.5

1925

B4

RF amplifier

Post-1925 amplifying valves, frequency changers
and signal diodes

Type

Description

Filament

Anode

Auxillary Grid

Grid

r_a

g_m/g_o

R_L

P_o

R_k

Base ^{(1)Pin-out details for non-exhibits can be found with the base details.}

Year

Volts

Amps

Volts

mA

Volts

mA

-V

kΩ

mA/V

kΩ

Watts

Ω

Type

Ref

 STC

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

3A/101-B

Triode

4.5

1.00

190

12.0

-

-

16.0

5.7

1.00

5.0

0.23

B5

1

3A/102-B

Triode

2.1

1.10

190

2.1

-

-

2.0

60.0

0.50

B5+tc

13

3A/105-B = CV809

Low-noise triode

13.0

0.19

250

15.0

-

-

2.5

19.0

2.10

18.0

30mW

B4+tc

31

3A/107-A = CV249

See 4019A = POVT72

-

-

3A/107AY

General-purpose triode

4.0*

0.25

190

9.7

-

-

8.0

5.5

1.17

11.0

0.24

BC4

1

3A//107B = CV1655

See 4019-B = POVT75

-

-

3A/108A = CV1653, CV1316

See 4020-A = POVT73A

-

-

3A/108AY

Repeater triode

2.0*

0.25

160

1.28

-

-

2.0

44.0

0.60

88.0

BC4

1

3A/108B = CV1657

See 4020-B

-

-

3A/108BY

Repeater triode

2.0*

0.25

160

1.28

-

-

2.0

44.0

0.60

88.0

BC4

1

3A/109-A = CV1671

See 4021-A = POVT102

-

-

3A/109AY

Repeater triode

4.0*

0.25

160

32.5

-

-

10.0

2.0

3.00

2.93

0.18

BC4

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

3A/109-B = CV1663

See 4021-B = POVT87, AR20

-

-

3A/109BY

Repeater triode

4.0*

0.25

160

32.5

-

-

10.0

2.0

3.00

2.93

0.18

B4

1

3A/110A = CV1664

See 4022-AR = POVT88, AR13

-

-

3A/110B = CV1659

See 4022-B = POVT81

-

-

3A/135A = CV2598

See 4264-A

-

-

3A/141A = CV1638

See 4101-D = POVT31 (also see below)

-

-

3A/141A = CV1639

See 4101-E = POV31B

-

-

3A/141AY

Repeater triode

4.5*

1.0

BC4

1

3A/142A = CV1641

See 4102-D = POVT32B

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

3A/142AW

Repeater triode

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

3A/142AY

Repeater triode

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

3A/144A CV1694

See 4104-D = POVT132

-

-

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

3A/145J = CV16

See S25A

-

-

3A/146J = CV53

See S26A

-

-

3A147J = CV82

See S27A

-

-

3A/148J = CV88

See 28A

-

-

3A/167M = CV5112

Output triode

6.3

0.45

350

45.0

-

-

1.0

4.7Ω

B8G

37

3A/172B = CV1670, CV1109

See Brimar 4D1 = POVT100B

-

-

3B/100B = CV1689

Output triode See Micromesh PA1

4.0

1.10

200

40.0

-

-

10.0

2.0

6.50

B5

1

3B/101B = CV1678

Triode = POVT110

4.0

1.00

200

6.0

-

-

2.0

10.0

5.00

B5

1

3B/102B = CV84

Output triode

6.3

0.80

500 max

100.0

-

-

2.5

6.0

B5

1

3B/151A = CV1648

See 4205-A = POVT56

-

-

3B/170A

See 4275-A

-

-

3B/200B CV1047

Power triode (Class B push-pull)

6.0*

1.10

600

12/64

-

-

17.0

5.0

5.00

9.0

40

B4

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

3B/240M = CV2214

VHF grounded grid triode

6.3

1.10

400 max

-

-

3.3

27.0

B8G+tc

54

3B/241M = CV5116

Grounded grid triode

19.0

0.37

B8G+tc

3B.252B = CV1668 = CV1220

See 4033-L = POVT120 See 4033-A = NT37

-

-

3B/400A = CV1452

See 4300-A

-

-

4A/137B = CV243

See 4045-A = POVT145

-

-

5A/102-A = CV3784

Output pentode

7.5

0.85

180

50.0

150

10.0

18.0

43.0

2.50

4.0

1.0

USM6+tc
IO+tc

2
8

5A/102D = CV1724

Output pentode= POVT183

7.5

0.85

180

50.0

150

10.0

18.0

43.0

2.50

4.0

1.0

IO+tc

8

5A/104B

Pentode

4.0

2.25

250

250

5A/105A = CV1726

RF pentode = POVT186

4.0

0.425

250

100

10.00

IO

157

5A/116B

See 4070-A

-

-

5A/117/B

See 4040-C

-

-

5A/1280B = CV244

See 4046-A = POVT122 = Cossor MS/Pen

-

-

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

5A/136A = CV2619

See 4328-A

-

-

5A/136D = CV245

See 4328-D = POVT185

-

-

5A/150A

See 4310-A

-

-

5A/152M

Power pentode

6.3

0.47

250

10.0

150

2.0

B8G

3

5A/157D = CV358

See Mullard EF37A

-

-

5A/159N = CV2000

RF pentode Data as Brimar 6AM6

B7G/F

21

5A/163K = CV1635

RF pentode

6.3

0.50

350

350

15.0

B9A

60

5A/170K = CV3998

Wideband amplifying pentode

6.3

0.30

210

175

16.5

B9A

45

5A/201M = CV2209

RF pentode

6.3

0.35

300 max

300 max

4.0

B7G

21

5A/206K = CV 2243

RF pentode Similar to Mazda 6F14

6.3

0.35

300 max

300 max

8.4

B9A

36

5B1 = CV1018

See Mazda 215SG

-

-

5B/100A = CV1369

See 4061-A = ATP10

-

-

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

5B/151A CV1080

See 4307-A = VT80

-

-

5B/250A = CV124

See US 807

-

-

5B/251M = CV428

Beam power amplifier

6.3

0.90

600

300

B8G

5B/252M = CV391

Beam power amplifier= LS650

6.3

0.90

600 max

120.0 max

300 max

6.0

B8G

65

5B/253M = CV499

Beam power amplifier

19.0

0.30

600 max

120.0 max

300 max

6.0

B8G

65

5B/254G = CV2465

Beam power amplifier, also CV428

6.3

0.90

600 max

120.0 max

300 max

6.0

B8G/F +tw

5B/254M = CV428

Beam power amplifier

6.3

0.90

600 max

120.0 max

300 max

6.0

B8G

5B/255M = CV391

Beam power amplifier= LS650

6.3

0.90

600 max

120.0 max

300 max

6.0

B8G

65

5B/256M = CV499

Beam power amplifier = VX7059

19.0

0.90

600 max

120.0 max

300 max

6.0

B8G

65

5B/257M = CV2220

Beam power amplifier

12.0

0.47

600 max

120.0 max

300 max

6.0

B8G

65

5B/258M = CV2347

Beam power amplifier

19.0

0.30

600 max

120.0 max

300 max

6.0

B8G+tc

66

5B/300B = CV834

Power pentode

10.0

0.80

500

60.0

250

22.0

B8G

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

5B/300BF

Power pentode

10.0

0.80

500

60.0

250

22.0

B8G

4019-A
4019-B

General-purpose triode

4.0*

0.25

190

9.7

-

-

8.0

5.5

1.17

11.0

0.24

BC4
B4

1
1

4020-A
4020-B
4020-C

Repeater triode

2.0*

0.25

160

1.28

-

-

2.0

44.0

0.60

88.0

BC4
B4
BC4+tc

1
1
D

4021-A
4021-B
4021-C

Repeater triode

4.0*

0.25

160

32.5

-

-

10.0

2.0

3.00

2.93

0.18

BC4
B4
BC4+tc

1
1
3

4022-AR
4022-B

Triode

4.0*

0.25

190

16.2

-

-

6.0

5.5

2.20

8.0

0.12

BC4
B4

1
1

4033-A & AF
4033-AA

Power triode (oxide)
(Class A push-pull)

6.0

1.50

400
500

50.0
100.0

-
 

-
 

20.0
25.0

1.67
 

9.00
 

7.0
6.0

4.0
11

-
-

B5
USM5

1
1

4033-L = 3B/252B

Power triode = CV1220, POVT120

6.0

1.40

600 max

170 max

1.67

9.0

B5

1

4043-A & C
4043-B & D

Power triode (oxide)
(Class B push-pull)

7.5*

1.20

500

20/80

-

-

55-65

3.5

2.30

8.0

50

-

USM4
B4

1
1

4045A = 4A/137B

Power tetrode = CV243

5.0*

1.6

250

45.0

65

0.2

70

B5

6

4046-A = 5A/128B

RF Pentode = CV244, POVT122

4.0

1.00

200

3.5

100

1.5

800.0

3.00

B5+tc

2

4056-A
4056-B = 3B/352A

Power triode (thoriated)
(Class B modulator)

6.0*

1.90

1000

13/67

-

-

70.0

5.5

2.20

13.0

73

L4
LB4

1
-

4061A = 5B/100A

Power pentode = CV1369, APT10

6.3

0.80

500

55.0

200

35.0

10.0

200.0

2.50

USM7+tc

17

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

4066-A = CV118

Power pentode

4.0

2.00

250

29.0

250

6.0

60.0

3.9

2.75

B7

24

4070-A = 5A/116B

Power pentode

4.0

2.25

250

250

4070-C = 5A/117B

Power pentode

4.0

1.00

250

250

4074-A = 33A/138A

Double output triode = CV18, CV1061

6.3

0.80

300

2x15.0

-

-

13.0

4.7

3.00

5.0

2x0.8

USM7+2tc

12

4097-A

Power triode (oxide) (Class B push-pull)

6.0*

1.10

500

25/135

-

-

38.0

3.0

3.30

3.3

75.0

B4

1

4101-D = CV2845

General-purpose triode = MOV LS5

4.5*

1.00

130

7.8

-

-

9.0

5.7

1.07

11.6

65mW

-

BC4

1

4101-E = 3A/141A

General-purpose triode = CV1639, POVT31D

4.5*

1.00

130

7.8

-

-

9.0

5.7

1.07

11.6

65mW

-

BC4

1

4101-G

General-purpose triode

4.5*

1.00

130

7.8

-

-

9.0

5.7

1.07

11.6

65mW

-

BC4

1

4102-D = 3A/142A

Repeater triode = CV1640, POVT32B

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

4102-E = 3A/142D

Repeater triode = CV1641, POVT32D

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

4102G

Repeater triode

2.0*

0.97

130

0.75

-

-

1.5

60.0

0.50

BC4

1

4104-D 3A/144A

Output triode for carrier telephony

4.4*

0.97

160

25.0

-

-

30.0

2.0

2.30

3.0

0.31

BC4

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

4104-E & G

Output triode for carrier telephony

4.4*

0.97

160

25.0

-

-

30.0

2.0

2.30

3.0

0.31

BC4

1

4205-A = 3B/151A

Power triode

4.5*

1.60

350

30.0

-

-

22.5

3.5

2.00

7.8

0.8

-

BC4-o

5

4205-E

Power triode (oxide) = CV1648, POVT56

4.5*

1.60

350

30.0

-

-

22.5

3.5

2.00

7.8

0.8

-

BC4-o

5

M.4205-E

Power triode (oxide)

4.5*

1.60

350

30.0

-

-

22.5

3.5

2.00

7.8

0.8

-

BC4-o

5

4215-A & B

Peanut triode

1.1*

0.25

60

1.00

-

-

5.0

25.0

0.24

Peanut

-

4238-A = 5A/136

Power pentode = CV2619

7.5

0.425

250

5.5

135

3.0

1.90

60.0

110mW

USM6+tc

2

4239-A

Triode for condenser microphone

1.1*

0.27

100

1.75

-

-

10.0

15.0

0.37

15.0

20mW

USS4

1

4264-A = 5A/135A

Low-noise triode = CV2598

1.5*

0.30

100

2.7

-

-

7.0

11.4

0.54

11.4

28mW

USS4

1

4275-A

Power triode (oxide)

5.0*

1.20

300

51.0

-

-

80.0

1.0

2.45

2.2

4.9

USM4b

1

4300-A 3B/400A

Power triode CV1452

5.0*

1.20

400

80.0

-

-

84.0

2.5

12.5

USM4b

1

4307-A & AF = CV1080, VT80

Power pentode

5.5*

1.00

300

43.0

300

30.0

4.5

9.1

USM5+tc
B7+tc

8
55

4310-A 5A/150A

Power pentode

10.0

0.32

250

5.5

135

3.0

1.90

60.0

110mW

USM6+tc

2

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

4328-A 5A/150A

Power pentode CV2619

7.5

0.425

250

5.5

135

3.0

1.90

60.0

110mW

USM6+tc

2

4328-D

Power pentode = CV245, POVT185

7.5

0.425

250

5.5

135

3.0

1.90

60.0

110mW

IO+tc

8

VLS350

See 3A/101-B

-

-

-

-

VLS407

See 3A/102-B

-

-

-

-

VLS417-B

See 3B/200-B

-

-

-

-

VLS452

See 5A/102-A

-

-

-

-

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 STC

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

4017A

HW/MV

DH

5.0

1.8

750 pk

1600

ESM+tc

4017B

HW/MV

DH

8.25

2.7

1.5A pk

4000

ESM+tc

4048A

HW/MV

DH

5.0

1.8

750 pk

1600

B4

4

4274A = CV1351

FW

DH

5.0

2.0

1000

175

USM4

3

Thyratrons

Type

Heater

Anode

Control

fmax

Gas

Base

Year

Volts

Amps

Pk Volts

Pk mA

Ratio

KHz

Type

Ref

Year

 STC

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

2D21

6.3

0.60

650

500

250

B7G

51

3D22

6.3

2.60

650

8A

B7D

3V/280B = 4039A

3V/281B = VLS432

3V/340B

2.5*

5.00

1500

2A

120

B4+tc

2

3V/420B

5.0

5.5

1500

2.5A

40

B5+tc

20A2

6.3

1.00

650

1.25A

IO

118

4039-A

4.0

1.00

1500

400

40

B5

1

4313-C = CV75

Cold

150

30

USS4

28

G1/236G

Cold

235

1.5

Wires

G1/237G

Cold

200

1.5

Wires

G1/371K

Cold

360

15

B7G

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

G150/2D

Cold

150

50

IO

141

G240/2D

Cold

240

50

IO

141

VLS432

10.0

0.43

1500

450

40

Barretters

Type

Current

Voltage

Base

Year

Amps

Min-Max

Type

Ref

Year

 STC

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

4006B

90mA

11-40

P.O.4-tags

BIC/1E-

95mA

3-9.5

CT3 each end

4004B

0.25

3-9

ES

4120AA

0.40

5.5-12

ES

4121AB

0.90

5.5-12

ES

Voltage Stabilisers

Type

AV Stab

Striking

Current mA

Regulation

Base

Volts

Voltage

Min

Max

Volts

Type

Ref

 STC

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

G50/2G

50

90

0.3

3

5

Wires

G55/1K

55

90

2

30

5

B7G

28

G75/3G

75

115

5

60

6.5

B8G

58

G120/1B

55

120

2

30

4.7

B4

12

G180/2G

150

180

5

45

5

B8G

59

G180/2M

150

180

5

45

5

B8G

59

G300/1K

130+150

400

5

15

6

B7G

75

G400/1K

306

400

2

4

3

B7G

62

G400/2G

306

400

2

4

3

B7G

62

OA2

150

180

5

30

6

B7G

28

OB2

108

127

5

30

3.5

B7G

28

OC2

75

115

5

30

4.5

B7G

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

VR75/30

75

105

5

40

6.5

IO

74

VR105/30

108

127

5

40

4

IO

74

VR150/30

150

180

5

40

4.5

IO

74