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.}

 Radions

A.2

D

3.5-4.0

0.25

30-90

43.0

0.13

5.5

1924

B4

RF/RCC amplifier

C

D

3.0

0.06

1924

B4

Replaced by DE.06Ω

C.1

D

1.8-2.0

0.25

1924

B4

C.2

D

1.8-2.0

0.35

1924

B4

Replaced by DE.34Ω

D.4

D

3.5-4.0

0.25

30-90

45.0

0.20

9.0

1924

B4

Detector

D.E.06

D

2.5-3.0

0.06

20-100

19.4

0.31

6.0

1925

B4

General purpose

D.E.06 HF

D

3.0

0.06

40-120

59.0

0.28

16.8

1925

B4

RF amp./det./RCC amp.

D.E.06 LF

D

2.7-3.0

0.06

40-100

0-6

27.0

0.33

9.0

1925

B4

AF amplifier

D.E.34

D

1.6-2.0

0.34

20-100

30.0

0.22

6.5

1925

B4

General purpose

D.E.34 HF

D

1.6-2.0

0.34

30-100

60.0

0.16

16.5

1925

B4

RF amp./det./RCC amp

D.E.34 LF

D

1.6-2.0

0.34

40-120

2-6

30.0

0.28

8.4

1925

B4

AF amplifier

G.P.

B

3.8

0.50

30-80

22.5

0.24

9.0

1924

B4

General purpose

Pyramid 1

D

5.0-5.5

0.34

20-60

5.7

1.10

6.3

1924

B4

AF amp./output

Pyramid 2

D

3.7-4.0

0.34

40-120

3-10

5.7

1.10

6.3

1925

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

 Radions

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

406 HF

RF or RCC triode

3.7*

0.06

60-150

-

-

60.0

0.33

B4

1

1926

406 LF

Detector or AF triode

2.7*

0.06

60-120

-

-

0-6

18.0

0.40

B4

1

1926

4V L.S.

Output triode

3.8*

0.40

60-120

-

-

0-9

10.0

0.80

B4

1

1926

5V.25B

General-purpose triode

5.0*

0.25

20-120

-

-

0-6

8.0

0.90

B4

1

1927

5V.25C

General-purpose triode

5.0*

0.25

20-120

-

-

0-6

8.0

0.90

US4

1

1927

5V.25H.B

General-purpose triode

5.0*

0.25

60-150

-

-

0-4.5

27.0

0.74

B4

1

1927

5V.25H.C

General-purpose triode

5.0*

0.25

60-150

-

-

0-4.5

27.0

0.74

US4

1

1927

D.E.06 HF

General-purpose triode

2.7-3.0*

0.06

40-120

-

-

0-6

59.0

0.28

B4

1

1925

D.E.06 LF

AF triode

2.7-3.0*

0.06

40-120

-

-

0-6

27.0

0.33

B4

1

1925

D.E.34 HF

General-purpose triode

1.6-2.0*

0.34

30-100

-

-

0-4.5

60.0

0.16

B4

1

1925

D.E.34 LF

AF triode

1.6-2.0*

0.34

40-120

-

-

3-9

30.0

0.28

B4

1

1925

H.F.6

RF or RCC triode

3.6*

0.60

40-120

-

-

59.0

0.30

B4

1

1926

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

L.S.2

Detector or AF triode

1.8-2.0*

0.34

40-120

-

-

1-6

12.7

0.47

B4

1

1926

Pyramid 2

AF or output triode

3.7-4.0*

0.34

40-120

-

-

0-9

8.0

0.70

B4

1

1925

Pyramid 3

AF or output triode

3.8*

0.18

40-120

-

-

0-9

8.0

0.70

B4

1

1926

Pyramid 4

AF or output triode

1.8*

0.70

40-120

-

-

3-9

8.0

0.70

B4

1

1926

Special Detector

Detector triode

3.6*

0.60

20-100

-

-

27.0

0.30

B4

1

1926

V.L.S.2

AF or output triode

1.8*

0.40

40-120

-

-

3-12

12.7

0.47

B4

1

1926