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.}

 Burndept

H.210

D

2.0

0.10

B4

H.310

D

3.0

0.10

30-90

1.0

60.0

0.25

15.0

1925

B4

RF amp./RCC

H.512

D

5.0

0.12

30-90

1.0

49.0

0.41

20.0

1925

B4

RF amp./RCC

H.L.212

D

2.0

0.12

25.0

8.0

1925/6

B4

General purpose

H.L.213

D

2.0

0.13

30-90

4.5

25.0

0.32

8.0

1925

B4

General purpose

H.L.310

D

3.0

0.10

30-90

4.5

18.0

0.33

6.0

1925

B4

General purpose

H.L.512

D

5.0

0.12

30-90

4.5

25.0

0.36

9.0

1925

B4

General purpose

H.L.565

D

5.0

0.65

30-90

42.0

0.21

9.0

1925

B4

General purpose

L.225

D

2.0

0.25

13.0

5.0

1925/6

B4

AF amp/output

L.240

D

2.0

0.40

90-120

6.0

6.5

0.92

6.0

1925

B4

Output

L.525

D

5.0

0.25

100-150

9.0

10.0

0.60

6.0

1925

B4

Output

L.550

D

5.0

0.50

60-150

8.0

6.0

0.67

4.0

1925

B4

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

 Burndept

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

H.310

RF or RCC triode

3.0*

0.10

80

0.8

-

-

0

55.0

0.31

B4

1

1925

H.512

RF or RCC triode

5.0*

0.12

80

1.4

-

-

0.5

40.0

0.45

B4

1

1925

H.L.212

General-purpose triode

2.0*

0.12

-

-

25.0

0.32

B4

1

1926

H.L.213

General-purpose triode

2.0*

0.13

80

1.5

-

-

1.0

23.0

0.28

B4

1

1925

H.L.310

General-purpose triode

3.0*

0.10

80

2.4

-

-

4.0

20.0

0.33

B4

1

1925

H.L.425

AF triode

4.0*

0.25

30-45

-

-

10.0

0.90

B4

1

1926

H.L.512

General-purpose triode

5.0*

0.12

80

2.2

-

-

0.25

25.0

0.36

B4

1

1925

H.L.565

General-purpose triode

5.0*

0.65

80

1.6

-

-

2.0

28.0

0.35

B4

1

1925

L.210

AF triode

2.0*

0.10

-

-

B4

1

1927

L.225

AF triode

2.0*

0.25

-

-

13.0

0.38

B4

1

1926

L.240

Output triode

2.0*

0.40

80

3.8

-

-

7.0

6.5

0.92

B4

1

1925

L.525

Output triode

5.0*

0.25

80

4.3

-

-

3.0

7.5

0.87

B4

1

1925

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.550

Output triode

5.0*

0.50

60-150

-

-

8.0

6.0

0.67

B4

1

1925

LL.525

Output triode

5.0*

0.25

-

-

3.0

1.10

B4

1

1927

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Burndept

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

U695

HW

DH

B4

4