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

 362 (Three Six Two)

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

ACFC4

Heptode FC

4.0

1.00

B7+tc

2

1935

ACH4

General-purpose triode

4.0

1.00

200

3.0

-

-

4.0

15.0

3.30

B5

1

1933

ACHL4

Detector or AF triode

4.0

1.00

250

5.0

-

-

5.0

10.0

3.30

B5

1

1934

ACHL4dd

Double diode triode

4.0

1.00

250

7.0

-

-

3.0

16.0

2.50

B7+tc

7

1935

ACHM4

RF pentode

4.0

1.00

250

10.0

100

4.0

2.50

B5+tc

2

1934

ACL4

Output triode

4.0

1.00

250

9.0

-

-

15.0

5.0

4.0

B5

1

1933

ACME4

Output pentode

4.0

1.00

250

36.0

180

12.0

8.0

8.0

3.0

B5+st

16

1934

ACME4a
ACME4b

Output pentode

4.0*

1.00

250

36.0

180

12.0

8.0

8.0

3.0

B4+st
B5

26
6

1934
1935

ACME4c

Output pentode

4.0

2.00

250

49.0

250

19.0

16.0

3.0

3.5

B7

24

1935

ACP4

Output triode

4.0

1.00

250

20.0

-

-

20.0

2.0

4.00

B5

A

1933

ACPN4

Output pentode

4.0

1.00

250

20.0

250

4.0

24.0

6.0

2.5

B5+st
B7

16
24

1933
1933

ACPX4 = PX4

Output triode

4.0

1.00

250

40.0

-

-

15.0

2.0

4.00

3.0

2.5

B5

1

1934

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

ACPX4a = PX4a

Output triode

4.0*

1.00

250

40.0

-

-

15.0

2.0

4.00

3.0

2.5

B4

1

1934

ACSG4

RF tetrode

4.0

1.00

250

4.0

40

1.0

400.0

2.50

B5+tc

2

1933

ACVP4

VM RF pentode

4.0

1.00

250

6.0

100

2.0

1/20

400.0

3.00

B7+tc+

5

1934

ACVS4

VM RF tetrode

4.0

1.00

250

6.0

50

2.0

1/40

400.0

2.00

B5+tc

2

1933

BA2

Class B double triode

2.0*

0.20

150

1.5/6

-

-

0

10.0

1.5

B7

10

1933

BX2

Class B double triode

2.0*

0.40

180

2/5/10

-

-

0

7.0

3.0

B7

10

1933

CLP

Output triode

6.5

0.60

250

27.0

-

-

20.0

2.0

4.00

3.0

1.50

B5

1

1935

CME

Output pentode

6.5

0.60

250

32.0

250

9.0

17.0

4.0

2.5

B7

24

1935

DB

Class B double triode

25.0

0.30

250

25/40

-

-

0

10.0

3.0

B7

10

1935

H2
H4
H6

Detector or RC triode

2.0*
4.0*
6.0*

0.10
0.10
0.10

150

2.0

-

-

1.5

32.0

1.00

B4

1

1933

HL2
HL4
HL6

Detector triode

2.0*
4.0*
6.0*

0.10
0.10
0.10

150

3.0

-

-

3.0

16.0

1.50

B4

1

1933

L2
L4
L6

AF triode

2.0*
4.0*
6.0*

0.10
0.10
0.10

150

4.0

-

-

4.5

12.0

1.20

B4

1

1933

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

LP2
LP4
LP6

Output triode

2.0*
4.0*
6.0*

0.20
0.10
0.10

150

7.0

-

-

7.5

5.0

3.00

13.0

0.30

B4

1

1933

ME2
ME2a

Output pentode

2.0*

0.20

200

12.0

150

4.0

10.0

2.00

20.0

0.50

B5
B4+st

6
26

1933
1933

ME4
ME4a

Output pentode

4.0*

0.10

200

12.0

150

4.0

10.0

2.00

20.0

0.50

B5
B4+st

6
26

1933
1933

ME6
ME6a

Output pentode

6.0*

0.10

200

12.0

150

4.0

10.0

2.00

20.0

0.50

B5
B4+st

6
26

1933
1933

ME25

Output pentode

4.0*

2.00

400

60.0

400

19.0

40.0

6.0

9.0

B5

6

1935

MHL20

Detector or AF triode

20.0

0.18

250

5.0

-

-

5.0

10.0

3.30

B5

1

1934

MHM20

RF pentode

20.0

0.18

250

10.0

100

4.0

2.50

B5+tc

2

1934

MME20

Output pentode

20.0

0.18

250

36.0

180

12.0

8.0

8.0

3.00

B5+st

16

1934

MP4

Split-anode tetrode

4.0

1.00

250

8.0

150

2.0

100.0

2.50

B7

53

1937

MPX20

Output triode

20.0

0.18

250

40.0

-

-

15.0

2.0

4.00

3.0

2.5

B5

1

1934

MSG20

RF tetrode

20.0

0.18

250

4.0

40

1.0

400.0

2.50

B5+tc

2

1934

MVS20

VM RF tetrode

20.0

0.18

250

6.0

50

2.0

1/40

400.0

2.00

B5+tc

2

1934

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

P2
P4
P6

Output triodes

2.0*
4.0*
6.0*

0.20
0.10
0.10

180

14.0

-

-

12.0

3.0

3.00

6.0

0.6

B4

1

1933

P625

Oscillator or power triode

6.0*

0.25

350

50.0

-

-

50.0

2.0

2.50

5.0

1.5

B4

1

1937

PX4a

Output triode

4.0*

1.00

250

50.0

-

-

25.0

1.2

5.00

2.5

3.0

B4

1

PX25

Power triode (Class A)

4.0*

2.00

400

65.0

-

-

50.0

1.0

6.00

3.0

7.0

B4

1

1935

PX25A

Output triode (Class A)

4.0*

2.00

250

50.0

-

-

25.0

1.2

5.00

2.5

3.0

B4

1

PX50

Power triode

6.0*

2.00

500

100.0

-

-

70.0

800Ω

6.00

7.5

13.0

L4

1

1935

PX60

Power triode (Class A)

6.0*

2.00

600

100.0

-

-

100.0

800Ω

5.00

5.0

18.0

L4

1

PX100

Power triode

6.0*

3.00

1000

100.0

-

-

140.0

1.0

6.00

7.0

34.0

L4

1

1935

PX120

Power triode

6.0*

4.00

1000

120.0

-

-

114.0

1.0

7.00

6.5

37.0

L4

1

PX200

Power triode (Class A)

12.0*

4.00

1500

140.0

-

-

108

1.0

12.00

8.5

72.0

PX300

Power triode

13.0*

5.00

2000

150.0

-

-

2.5

8.00

RFP8/14

Power TX pentode

4.0*

1.00

400

35.0

250

13.0

20.0

4.00

B5+tc
B7

2
 

1937
1937

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

RFP15

Power TX pentode

4.0*

1.00

500

55.0

350

18.0

20.0

4.00

10.0

21.0

B5+tc

2

1936

RFP30

Power TX pentode

4.0*

2.00

650

75.0

400

25.0

5.00

10.0

37.0

B5+tc

2

1936

RFP60

Power TX pentode

6.0*

2.00

900

105.0

500

35.0

30.0

6.00

10.0

70.0

B5+tc

2

1936

RFP120

Power TX pentode

6.0*

3.00

1400

120.0

600

5.00

10.0

1936

SG2
SG4
SG6

RF tetrodes

2.0*
4.0*
6.0*

0.20
0.10
0.10

150

4.0

60

1.0

400.0

1.50

B4+tc

2

1933

SP2

Output triode

2.0*

0.20

150

14.0

-

-

15.0

2.0

3.50

B4

1

SR2

Output triode

2.0*

0.30

200

10.0

-

-

10.0

2.00

B4

1

1937

SR4

Output triode

4.0

1.00

250

20.0

-

-

20.0

4.00

B5

1

1937

UFC

Heptode FC

6.5

0.30

250

4.0

150

1/10

B7+tc

2

1934

Uhdd

Double diode triode

6.5

0.30

250

5.0

-

-

3.0

20.0

2.00

B7+tc

2

1935

UHL

General-purpose triode

6.5

0.30

250

6.0

-

-

4.0

16.0

2.00

B5

1

1935

ULP

Output triode

13.0

0.30

250

27.0

-

-

20.0

2.0

4.00

3.0

1.5

B5

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

UME

Output pentode

13.0

0.30

250

32.0

250

9.0

17.0

4.0

2.5

B7

24

1935

UPX

Output triode

25.0

0.30

250

38.0

-

-

34.0

800Ω

7.00

3.5

3.0

B5

1

1935

UVP

VM RF pentode

6.5

0.3

250

8.0

150

1/10

300.0

2.00

B7+tc

4

1935

VP2
VP2c

VM RF pentode

2.0*

0.10

150

4.0

60

1.5

0/9

400.0

1.20

B4+tc
B7+tc

2
4

1934
1935

VS2
VS4
VS6

VM RF tetrode

2.0*
4.0*
6.0*

0.20
0.10
0.10

150

3.0

60

1.0

0/25

500.0

1.20

B4+tc

2

1933

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 362

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

RB41

FW

DH

4.00

1.00

300

60

B4

5

1934

RB42

FW

DH

4.00

2.00

500

120

B4

5

1934

RB250/80

FW

DH

4.0

1.00

250

80

B4

5

RB350/80

FW

DH

4.0

1.50

350

80

B4

5

1936

RB500/120

FW

DH

4.0

2.00

500

120

B4

5

1936

RB650/80

FW

DH

4.0

650

80

B4

5

1935

RB650/250

FW

DH

4.0

4.00

650

250

B4

5

1935