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

 Ever Ready

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

A20B = 2D4A

Double diode

4.0

0.65

140

0.8

-

-

B5

3

1935

A23A, A23B = TDD4

Double diode triode

4.0

0.65

250

4.0

-

-

7.0

13.5

2.00

B7+tc

7

1935

A27D = Pen4DD

Double diode output pentode

4.0

2.25

250

36.0

250

5.0

6.0

7.0

4.3

B7+tc

2

1937

A30B = 904V

Detector or AF triode

4.0

0.65

200

2.0

-

-

2.0

36.0

2.00

B5

11

1935

A30D = 354V

Detector or AF triode

4.0

0.65

250

6.5

-

-

4.5

11.5

3.50

B5

1

1935

A36A = TH4

Triode hexode frequency changer

4.0

1.00

h250
t150

4.0
6.0

70
 

6.0
 

1.5
 

1.5M
 

1.0⅄
1.20

B7+tc

3

1937

A36B, A36C = TH4B

Triode hexode frequency changer

4.0

1.5

h275
t100

3.25
22.0

100
 

7.0
 

2.5
 

1.5M
 

0.75
6.0

B7+tc

3

1937

A40M = MM4V

VM RF tetrode

4.0

1.00

200

6.0

110

0.8

2.50

B5+tc

2

1936

A50A = SP4

RF pentode

4.0

1.00

200

3.0

100

1.2

2.0

2.2M

2.30

B5+tc

2

1935

A50B = SP4B

RF pentode

4.0

0.65

250

4.0

250

1.5

2.4

2M

3.40

B5+tc

2

1936

A50M = VP4

VM RF pentode

4.0

1.00

200

4.5

100

2.4

2.0

1M

2.30

B7+tc

2

1936

A50N = VP4A

VM RF pentode

4.0

1.20

200

4.25

100

1.8

2.0

1.4M

2.50

B5+tc
B7+tc

2
6

 
1935

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

A50P = VP4B

VM RF pentode

4.0

0.65

250

11.5

250

4.25

3.0

2.00

B7+tc

6

1936

A70B = Pen4VA

Output pentode

4.0
4.0

1.50
1.35

250
250

32.0
36.0

250
250

 
3.0

 
22.0

8.0
6.0

3.4
3.8

B5+tc
B7

7
24

1936
1938

A70C = PenA4

Output pentode

4.0

1.95

250

36.0

250

5.0

5.8

8.0

3.8

B7

24

1935

A70D = PenA4

Output pentode

4.0

1.95

250

36.0

250

5.0

5.8

8.0

3.8

B7

24

1936

A70E = PenB4

Output pentode

4.0

2.10

250

72.0

275

7.0

14.0

3.5

8.8

B7

24

1937

A80A = FC4

Octode frequency changer

4.0

0.65

mix250
osc90

1.6
2.0

90
 

3.8
 

1.5
 

1.6M
 

0.6⅄
 

B7+tc

2

1935

C20C = 2D13C

Double diode

13.0

0.20

140

0.8

-

-

B5

3

1936

C23B = TDD13C

Double diode triode

13.0

0.20

200

4.0

-

-

5.0

10.0

2.90

B7+tc

7

1937

C27D = Pen40DD

Double diode output pentode

44.0

0.20

200

45.0

200

6.0

8.5

35.0

8.00

4.5

4.0

170

B7+tc

22

C30B = HL13C

Medium-μ triode

13.0

0.20

200

5.0

-

-

3.7

12.0

3.30

B7+tc

23

1935

C36A = TH21C

Triode hexode frequency changer

21.0

0.20

h250
t150

3.7
7.0

100
 

7.5
 

2.0
 

2M
 

0.75⅄
5.5

B7+tc

3

1937

C36B = TH30C

Triode hexode frequency changer

29.0

0.20

h250
t100

3.25
9.5

100
 

6.0
 

2.5
 

1.5M
 

0.75⅄
 

B7+tc

3

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

C36C = TH22C

Triode heptode frequency changer

29.0

0.20

h250
t100

3.25
9.5

100
 

6.0
 

2.50
 

1.5M
 

0.75
 

140

B7+tc

3

C36N = TH30C

Triode hexode frequency changer

29.0

0.20

h250
t100

3.25
9.5

100
 

6.0
 

2.5
 

1.5M
 

0.75⅄
 

B7+tc

3

C50B = SP13C

RF pentode

13.0

0.20

200

2.5

200

0.9

2.2

2.5M

2.80

B7+tc

6

1936

C50N = VP13C

VM RF pentode

13.0

0.20

200

9.0

200

3.6

2.0

2.20

B7+tc

6

1935

C70D, C70E = Pen36C

Output pentode

35.0

0.20

200

40.0

200

6.0

9.0

4.0

3.1

B7

24

1935

C80B = FC13C

Octode FC

13.0

0.20

mix200
osc90

1.6
2.0

70
 

3.8
 

1.5
 

0.6⅄
 

B7+tc

2

1936

K23A = TDD2A

Double diode triode

2.0*

0.10

135

2.0

-

-

4.5

12.0

1.40

B5+tc

5

1936

K23B = TDD2A

Double diode triode

2.0*

0.12

135

1.05

-

-

1.5

25.0

1.20

B5

1

1935

K30A = PM2HL

RF or detector triode

2.0*

0.10

135

1.5

-

-

3.0

22.5

0.80

B4

1

1935

K30B = PM1LF

Detector or AF triode

2.0*

0.10

135

3.25

-

-

6.0

12.0

0.90

B4

1

1935

K30C = PM2HL

Detector or AF triode

2.0*

0.10

135

2.3

-

-

1.5

23.4

1.20

B4

1

1935

K30D = PM2HL

Detector or AF triode

2.0*

0.10

135

-

-

4.5

18.0

1.00

B4

1

1935

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

K30E = PM2DX

Driver triode for Class B

2.0*

0.10

135

2.0

-

-

4.5

18.0

1.00

B4

1

1935

K30G = PM2A

Output triode

2.0*

0.20

135

5.0

-

-

6.0

6.0

2.00

7.0

0.15

B4

1

1935

K30K = PM2HL

Medium-μ triode

2.0*

0.10

135

2.2

-

-

1.5

21.5

1.40

B4

1

1937

K33A = PM2B

Class B output triode

2.0*

0.20

120

3/20

-

-

0

14.0

1.25

B7

10

1935

K33B = PM2BA

Class B output triode

2.0*

0.20

120

3/20

-

-

4.5

14.0

1.45

B7

10

1935

K40B = PM12

RF tetrode

2.0*

0.18

135

2.0

90

0.4

0

330.0

1.50

B4+tc

2

1936

K40N = PM12M

VM RF tetrode

2.0*

0.18

135

1.8

90

0.4

0

1.40

B4+tc

2

1935

K50M = VP2

VM RF pentode

2.0*

0.18

135

3.0

135

1.25

0

400.0

1.50

B7+tc

4

1935

K50N = PM12M

VM RF hexode

2.0*

0.14

135

2.0

60

0.95

1.5

1.3M

1.40

B7+tc

4

1937

K70B = PM22A

Output pentode

2.0*

0.20
0.15

150
135

9.5
5.6

150
135

2.5
1.35

4.5
4.5

15.0
19.0

0.42
0.34

B4+st
B5

26
6

1935
1937

K70D = PM22D

Output pentode

2.0*

0.30

135

5.0

135

0.8

2.4

24.0

0.3

B5

6

1936

K77A = QP22A

Double output pentode

2.0*

0.50

135

2.5

135

10.5

16.0

1.45

B9

4

1935

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

K77B = QP22B

Double output pentode

2.0*

0.30

135

3.8

135

0.5

11.7

14.7

1.33

B7

11

K80A = FC2

Octode frequency changer

2.0*

0.125

mix150
osc150

0.95
 

70
 

0.75
 

0
 

0.2⅄
 

B7+tc

1

1935

K80B = FC2A

Octode frequency changer

2.0*

0.12

mix135
osc135

0.7
2.1

45
 

0.7
 

0.5
 

2.5M
 

0.27⅄
 

B7+tc

1

1937

S30C = AC044

Output triode

4.0*

1.00

300

50.0

-

-

38.0

1.2

5.00

2.3

3.5

B4

1

1935

S30D = AC042

Output triode

2.0*

2.00

300

50.0

-

-

38.0

1.2

5.00

2.3

3.5

B4

1

1937

S50C = AC044

Output triode

2.0*

1.00

300

50.0

-

-

38.0

1.2

5.00

2.3

3.5

B4

1

1935

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Ever Ready

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

A11B = IW4-350

FW

IH

4.0

2.40

350

120

B4

14

1935

A11C = IW4-500

FW

IH

4.0

2.40

500

120

B4

14

1936

A11D = IW4-350

FW

IH

4.0

2.00

350

120

B4

14

1936

C10B = UR1C

HW

IH

20.0

0.20

250

75

B5

8

1935

S11A = DW2

FW

DH

4.0

1.00

250

60

B4

5

1936

S11D = DW4-350

FW

DH

4.0

2.00

350

120

B4

5

1937

Tuning Indicators

Type

Heater

Anode

Target

-Vg1

Shadow

Base

Year

Volts

Amps

Volts

mA

Volts

mA

max/min

angle x°

Type

Ref

Year

 Ever Ready

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

A39A = TV4 (Mullard)

Ct8

9

1937

C39A = EM1 (Mullard)

Ct8

9

1937