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.}

 BTH

A

B

4.0

0.72

45-100

1917

B4

GP. Similar to R

B

B

4.0

0.72

45-100

1917

B4

GP. Similar to R.

B2

B

5.0

0.70

40-120

37.0

0.27

10.0

1922

B4

GP. Similar to R5V

B3

D

1.8

0.35

20-80

0-3

27.0

0.28

7.5

1924

B4

General purpose

B4

D

6.0

0.25

40-120

0-4.5

6.0

1.10

6.5

1923

B4

Output

B4H

D

6.0

0.25

40-120

28.0

0.70

20.0

1924

B4

General purpose

B5

D

2.8

0.06

20-80

0-4.5

17.0

0.41

7.0

1923

B4

General purpose

B6

D

2.8

0.12

40-120

0-4.5

12.0

0.67

8.0

1924

B4

Output

B7

D

6.0

0.06

40-120

0-4.5

12.0

0.67

8.0

1924

B4

AF amp./output

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

 BTH

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

B5H

RF or RCC triode

2.8*

0.06

120

-

-

55.0

0.33

B4

1

1926

B8

RCC triode

2.8*

0.12

150

-

-

180.0

0.28

B4

1

1927

B11

Output triode

6.0*

0.50

200

-

-

36.0

2.5

1.40

B4

1

1927

B12

Output triode

7.5*

1.25

425

55.0

-

-

80.0

2.9

0.98

3.1

B4

1

1927

B21

RF or detector triode

2.0*

0.10

150

-

-

32.0

0.50

B4

1

1927

B22

General-purpose triode

2.0*

0.10

100

-

-

14.0

0.54

B4

1

1927

B23

Output triode

2.0*

0.20

100

-

-

8.0

0.57

B4

1

1927

B210H

RF or RCC triode

2.0*

0.10

150

-

-

250.0

0.14

B4

1

1927

B210L

Detector triode

2.0*

0.10

120

-

-

14.0

0.93

B4

1

1927

B215P

Output triode

2.0*

0.15

120

-

-

7.0

1.00

B4

1

1927

BG3

Triode (no data)

-

-

B4

1

BS215

RF tetrode

2.0*

0.15

150

75

230.0

0.55

B4+tt

2

1929

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

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

BTS215

Detector triode & AF triode (Two-Stage)

2.0*

0.15

80-120
 80-120

-
 

-
 

 
4.5-9

100.0
7.0

0.27
 0.90

B4+2st

24

1928

GP210

General-purpose triode

2.0*

0.10

★

-

-

B4

1

1928

GP407

General-purpose triode

4.0*

0.07

★

-

-

B4

1

1928

GP607

General-purpose triode

6.0*

0.07

★

-

-

B4

1

1928

HF210

RF triode

2.0*

0.10

★

-

-

B4

1

1928

HF407

RF triode

4.0*

0.07

★

-

-

B4

1

1928

HF607

RF triode

6.0*

0.07

★

-

-

B4

1

1928

LF210

AF triode

2.0*

0.10

★

-

-

B4

1

1928

LF407

AF triode

4.0*

0.07

★

-

-

B4

1

1928

LF607

AF triode

6.0*

0.07

★

-

-

B4

1

1928

P227

Output triode

2.0*

0.27

★

-

-

B4

1

1928

P415

Output triode

4.0*

0.15

★

-

-

B4

1

1928

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

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

P615

Output triode

6.0*

0.15

★

-

-

B4

1

1928

PX650

Output triode

6.0*

0.50

★

-

-

B4

1

1928

RC210

RCC triode

2.0*

0.10

★

-

-

B4

1

1928

RC407

RCC triode

4.0*

0.07

★

-

-

B4

1

1928

RC607

RCC triode

6.0*

0.07

★

-

-

B4

1

1928

SG207

RF tetrode

2.0*

0.075

120

1.5

80

1.2

1.0

0.40

B4+tt

2

1928

Screen Grid

RF tetrode (no data)

1.0*

0.10

B4+tt

2

1927

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 BTH

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

RH1

HW

DH

7.5

1.25

550

65

B4

4

1927

Thyratrons

Type

Heater

Anode

Control

fmax

Gas

Base

Year

Volts

Amps

Pk Volts

Pk mA

Ratio

KHz

Type

Ref

Year

 BTH

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

BT1

2.0

5.00

1000

900

Mercury

BT5 = CV1147

5.0

4.50

1000

12.5A

Mercury

USM4b+tc

25

BT5A

5.0

4.50

1000

12.5A

Mercury

USM4b+tc

25

BT8

2.0

2.50

500

275

Mercury

BT19 = CV1144

2.5

5.00

1000

2A

Mercury

B4+tc

35