Radio Valve Data: 1915-1960

Keith R Thrower OBE, The Valve Museum, April, 2022.

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

 Ekco

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

2D41

Double diode

4.0

0.65

200

0.8

-

-

B7

21

'37/38

DO42

Double diode output pentode

4.0

2.25

250

36.0

250

5.0

6.0

50.0

9.50

7.0

4.3

10.0

B7+tc

22

'37/38

D41

Triode

-

-

B5

1

'37/38

DT41

Double diode triode

4.0

0.65

250

4.0

-

-

7.0

13.5

2.00

B7+tc

7

'37/38

DTU1

Double diode triode

13.0

0.20

200

4.0

-

-

5.0

13.5

2.00

B7+tc

7

'37/38

OP41

Output pentode

4.0

2.10

250

72.0

275

7.0

22.0

8.50

3.5

8.8

B7

24

'37/38

OP42

Output pentode

4.0

1.95

250

36.0

250

5.0

5.8

50.0

9.50

8.0

3.8

B7

24

'37/38

T41

High-μ detector triode

4.0

0.65

200

1.35

-

-

1.5

35.0

3.60

B5

1

'37/38

TX41

Triode heptode frequency changer

4.0

1.45

h250
t100

3.25
9.5

100
 

6.0
 

2.5
 

1.5M
 

0.75⅄
5.50

140
 

B7+tc

3

'37/38

VP41

VM RF pentode

4.0

0.65

250

11.5

250

4.25

3.0

2.00

B7+tc

6

'37/38

VPU1

VM RF pentode

13.0

0.20

200

9.0

200

3.6

2.0

2.20

B7+tc

6

'37/38

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Ekco

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

R41 = DW3 (Mullard)

FW

DH

B4

5

1937