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.}

 Various

B

B

6.0

0.86

600

1917

B4

Low-power TX valve. Similar to R-valve

F

B

1918

B4

Low-power TX valve. Similar to R-valve

R

B

4.0

0.65

30-100

40.0

0.23

9.0

1916

B4

General purpose

R.2

B

3.3

1.10

30

3.3

1917

Can

Soft valve

R.2A

B

3.5

1.20

25-40

1918

Can

Soft helium-filled

R.4

B

3.5

1.00

45-55

50.0

0.24

12.0

1917

Can

R.4A

B

3.5

0.65

45-55

1918

Can

R.4B

B

3.8

0.65

50-80

75.0

0.19

14.0

1918

Can

R.4C

B

3.8

0.65

45-55

1919

Can

R.5

B

3.9

0.67

50-80

20.0

0.45

9.0

1918

I/S1

R.8 (Horned)

B

4.0

0.70

40-160

30.0

0.30

10.0

1916

B4+2tc

RF amplifier