Radio Valve Data: 1915-1960

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

Imported Triode Receiver Valves^*

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.}

 Loewe

Audion B.E.

B

3.8-4.0

0.32

60-120

7.0

0.84

5.9

1925

B4

AF amp/output

Audion D.E.

D

2.0-2.5

0.17

22.0

0.14

3.0

1925

B4

General purpose

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

 Loewe

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

2HF

Double RF bi-grid

4.0*

0.165

90
90

1.0
2.2

10-30
10-30

0.3
0.6

476.0
28.0

0.30
0.60

6-pin

179

1927

2HMD

Mixer tetrode
Oscillator tetrode

4.0

1.50

200
200

4.0
4.0

100
100

5.0
5.0

400.0
400.0

1.20
1.20

4-pin +2st

178

2NF

Triode
Triode

4.0

0.60

135
135

 
15.0

-
 

-
 

660.0
2.4

0.20
2.00

6-pin+cc

3NF

Detector triode
AF triode
Output triode

4.0*

0.35

135
135
135

 
 
7.0

-
 
 

-
 
 

 
 
7.5

290.0
290.0
7.0

0.20
0.20
1.20

 
 
0.4

6-pin

181

1927

3NFB = 3NF Bat 3NF Net (for DC)

Detector triode
AF triode
Output triode

4.0*

0.125

90-200
90-200
90-200

 
 
8-10

-
 
 

-
 
 

290.0
290.0
3.8

0.20
0.20
1.20

6-pin+cc

175

3NFK

Detector triode
AF triode
Output triode

4.0†

1.20

300
300
300

2.0
0.3
35.0

-
 
 

-
 
 

290.0
290.0
1.0

0.20
0.20
3.50

 
 
12.0

 
 
2.0

7-pin+cc

176

3NFL

Detector triode
AF triode
Output triode

4.0†

1.20

300
300
300

2.0
0.3
35.0

-
 
 

-
 
 

48.0
290.0
1.0

1.20
0.20
3.50

 
 
12.0

 
 
2.0

9-pin+cc

177

3NFW

Detector triode
AF triode
Output triode

4.0†

1.00

200
200
200

2.0
0.2
20.0

-
 
 

-
 
 

290.0
290.0
1.5

0.20
0.20
3.00

 
 
1.0

 
 
0.8

7-pin+cc

176

AR23

Triode

3.5*

0.50

-

-

B4

1

HF29, HF30

Triode
Triode

4.0*

0.15

-
 

-
 

6-pin

180

1929

HF30

Triode
Triode

4.0*

0.125

90-200
90-200

 
2-3

-
 

-
 

12.0
12.0

1.30
1.30

6-pin

180

LA74

Triode

3.0*

0.06

50-100

-

-

B4

1

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

LA75

General-purpose triode

2.0*

0.17

-

-

B4

1

LA77

Bi-grid

1.3*

0.13

60-200

B4

LA101

Triode

3.8-4.0*

60-120

-

-

7.0

0.90

B4

1

1926

MO44

Mixer tetrode
Oscillator tetrode

35.0

0.18

200
200

4.0
4.0

70.0
70.0

5.0
5.0

400.0
400.0

1.20
0.20

7-pin +tc

169

RNF7 = 3NF
(British made)

Detector triode
AF triode
Output triode

4.0*

0.34

90-150

-

-

6-pin

181

1927

WG33

Triode
Triode
Output tetrode

50.0

0.18

90-250
90-250
90-250

 
 
15.0

 
 
75

 
 
2.0

 
 
10.0

24.0
Ω
65.0

1.20
Ω
1.50

 
 
1.0

8pin +cc +2sc

170

WG34

Tetrode detector
Output pentode

50.0

0.18

90-250
90-250

0.35
30.0

30
200

 
 
12.0

2M
45.0

1.00
4.50

 
9.0

 
2.0

12-pin

171

WG35

VM RF tetrode
Diode & output pentode

63.0

0.18

90-250
90-250

0.35
50.0

40
200

 
9.0

 
18.0

2M
25.0

1.00
4.00

 
3.0

12-pin +tc

172

WG36

VM RF pentode mixer
Triode oscillator
VM RF pentode

65.0

0.18

90-250
90-250
90-250

3.0
5.0
4.0

100
 
100

8.0
 
1.7

500.0
3.0
800.0

0.80
3.30
2.50

12-pin +tc

173

WG37

VM RF pentode
Tetrode detector
Output pentode

75.0

0.18

200
200
200

4.0
0.35
35.0

100
40
200

1.7
0.08
10.0

750.0
2M
45.0

 
 
9.0

12-pin +tc

174

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Loewe

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

4NG

FW

DH

4.0

0.70

300

80

B4

37

1931

8NG

FW

DH

2.5

1.00

300

80

B4

37

1931

10NG

HW

DH

4.0

0.25

300

30

B4

4

1931

12NG

FW

DH

4.0

0.25

300

30

B4

37

1931

16NG

HW

DH

2.0

0.24

250

15

B4

4

1935

26NG

FW

IH

40.0

0.18

260

70

USS6

9