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Radio Valve Data: 1915-1960

Keith R Thrower OBE, The Valve Museum, April, 2022.
    
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Help information: Abbreviations - Explanations - Notes.

 

Triode Receiver Valves (pre-1926)*

Type or
Trademark
Filament
Anode
Grid
ra
gm
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
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.

M-OV - Marconi - Osram

D.E.1
D
1.8
0.36
30-45
40.0
0.22
9.0
1923
B4
Replaced by D.E.2 HF
D.E.2
D
1.8
0.24
30-45
40.0
0.22
9.0
1923
B4
Replaced by D.E.2 HF
D.E.2 HF
D
1.8
0.12
40-100
1.5
45.0
0.27
12.0
1925
B4
RF amplifier
D.E.2 LF
D
1.8
0.12
20-80
4.5
22.0
0.32
7.0
1925
B4
Det./AF amplifier
D.E.3
D
2.8
0.06
20-80
4.5
22.0
0.32
7.0
1923
B4
Det./AF amplifier
D.E.3B
D
2.8
0.06
40-120
1.5
50.0
0.34
17.0
1924
B4
RF amp./RCC amp.
D.E.4
D
4.0
0.30
20-120
4.5
11.0
0.64
7.0
1924
B4
AF amp./output
D.E.5
D
5.0-6.0
0.25
20-120
4.5
8.0
0.88
7.0
1924
B4
Output
D.E.5A
D
5.0-6.0
0.25
60-120
12.0
4.0
0.88
3.5
1925
B4
Output
D.E.5B
D
5.0-6.0
0.25
60-120
2.0
30.0
0.67
20.0
1924
B4
RCC amplifier
D.E.6
D
2.0
0.50
60-120
6.0
10.0
0.55
5.5
1924
B4
Output
D.E.8 HF
D
6.0
0.12
20-120
1.5
25.0
0.64
16.0
1925
B4
RF amp./detector
D.E.8 LF
D
6.0
0.12
20-100
4.5
8.0
0.88
7.0
1925
B4
AF amp./output
D.E.Q.
D
3.0
0.20
30-60
100.0
0.20
20.0
1923
4C
Det. Replaced Q.X
D.E.R.
D
1.8
0.35
30-80
3.0
32.0
0.28
9.0
1922
B4
General purpose
D.E.V.
D
3.0
0.20
20-60
24.0
0.25
6.0
1923
4C
RF amp. Replaced V.24
D.E.V.X
D
3.0
0.20
20-60
3.0
24.0
0.25
6.0
1923Ω
B4
B4 version of D.E.V
LM11
D
1.75
0.40
50
Ω
2C+2FL
L.S.1
B
6.0
1.50
200-400
15.0
0.73
11.0
1923
B4
Output
L.S.2
B
6.0
1.50
200-400
8.0
0.63
8.0
1923
B4
Output
L.S.3
B
4.0
0.65
100-200
10.0
0.45
4.5
1923
B4
Output
L.S.5
D
4.5
0.80
60-400
8.0
6.0
0.83
5.0
1923
B4
Output
L.S.5A
D
4.5
0.80
60-400
20.0
2.75
0.91
2.5
1924
B4
Output
L.S.5B
D
4.5
0.80
60-400
3.0
30.0
0.83
25.0
1926
B4
AF amplifier
L.T.1
D
1.8
0.40
36-50
1921
B4
Prototype of D.E.R
L.T.2
D
3.5
0.11
36-50
1921Ω
B4
General purpose
L.T.3
D
1.8
0.11
36-50
1922
B4
General purpose
Q
B
5.0
0.45
50-150
150.0
0.30
45.0
1916
4C
Low cap. detector
Q.X
B
5.0
0.75
20-150
80.0
0.31
25.0
1921
4C
Replaced type Q
R.5V
B
5.0
0.70
30-100
30.0
0.30
9.0
1924Ω
B4
General purpose
R.Z
B
5.0
0.75
40-60
40.0
0.23
9.0
1923Ω
B4Ω
Preceded R.5VΩ
V.24
B
5.0
0.75
20-60
20.0
0.30
6.0
1919
4C
Low cap. GP

These valves may be found with any of the following trademarks: GEC, Marconi, Marconi's W.T. Co. and Osram.

 

Four-electrode Valves (Bi-grid)

Type or
Trademark
Filament
Anode (8)The anode and inner grid were usually supplied with the same voltage.
Outer Grid (9)The outer grid is equivalent to the control grid of the triode valve.
ra
gm
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
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.
 

 M-OV - Marconi - Osram

D.E.7
D
1.8
0.4
615
1.5
820
4.5
1924
B4 + st
F.E.1
B
4.5
1.2
24
16.0
1920
5C
F.E.2
B
4.5
1.2
1920
5C
F.E.3
B
4.0
0.7
615
1.5
820
4.5
1924
B4 + st

 

Round Soft Triodes

Type (10)The CA, CT, D and N were all later variants of the C valve.
Filament Current
Anode Potential (V)
Marking on Glass
Base (3)Pin-out details for non-exhibits can be found with the base details.
Filament Type (13)Three types of filaments were used: platinum, platinum-iridium and tungsten.

 Marconi

C
2V-PF-50
2V-TF-50
BC-2
BC-2
Single platinum filament
Single Tungsten filament
CA
2.5A
200
2V-PF
2V-PF-3F
2V-PIF
2V-PIF
BC-2 or 4-SCt (std)
4-SCt (std)
BC-2
4-SCt (std)
Single platinum filament.
Three platinum filaments.
Single platinum-iridium filament.
Single or triple platinum-iridium filament.
CT
2V-PF-3F
4-SCt (std)
Triple platinum filament.
D
2V-PF
ES
Single platinum filament.
LT
1.01.2A
1500
B4
N
2A @ 2.8V
4080
2V-PIF
ES
Single platinum-iridium filament.
T & TN
[11] The TN was a later development of the T type. Both these, and the type LT, were transmitter valves.

[12] The last item on the list is believed to be a type T or TN.
44.5A @ 6V
2000
TF-HC-3F
HV-PF-HG
PF-HC-3F
2V-PF-50
BC + 4 wires
BC-3
BC + 4 wires
4-SCt (large)
One, two or three tungsten filaments.
Three platinum filaments.
Three platinum filaments.
Three platinum filaments.

 

Post-1925 amplifying valves, frequency changers
and signal diodes

Type
Description
Filament
Anode
Auxillary Grid
Grid
ra
gm/go
RL
Po
Rk
Base (1)Pin-out details for non-exhibits can be found with the base details.
Year
 
 
Volts
Amps
Volts
mA
Volts
mA
-V
mA/V
Watts
Ω
Type
Ref
 

 M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
6BJ6
VM RF pentode
6.3
0.15
-
-
B7G
32
A373
Peak voltmeter diode
1.8*
1.60
2000
3.0pk
-
-
SES
-
1938
A537
Low-noise AF triode
(microphone amplifier)
4.0
0.40
150
50
3.3
1.0
-
-
6.0
2.0
10.0
10.0
1.55
1.55
20.0
50.0
Ct4
2
1936
A577
Voltmeter triode
4.0
1.00
250
-
-
3.0
2.00
B5
1
1936
A748
Double D43 for TV
4.0
-
-
1938
A800
Absorber single diode
4.0
2.00
1000
100.0
-
-
B4
29
PW
A802
Triode for photocell amp
4.0
1.00
100
2.6
-
-
3.0
8.0
2.50
B5
1
1937
A819 = CV1698
RF tetrode
3.33
1.40
250
250
100.0
4.20
B7+tc
30
A901 = CV1722
Tetrode
5.5
1.40
135
135
10.0
B7
24
A964
Triode for photocell amp
4.0*
0.10
150
-
-
5.0
1.50
B4
1
1938
A1178
Low noise AF triode
4.0
0.25
150
-
-
9.0
2.80
Ct4
2
1939
A1714 = CV408
VHF/UHF triode
6.3
0.49
10.0
-
-
2.2
8.5
B7G
81
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
A2087
Noise generator diode
4.4
0.64
200
20.0
-
-
B7G
80
A2097 = CV2171
VHF noise diode for frequencies to 500MHz
3.7-4.4
0.58-0.64
200 max
5-20
B7G
80
A2134 = CV4062
Output pentode
6.3
0.635
165
40.0
165
7.2
10.0
23.5
9.50
4.0
2.85
220
B7G
33
A2224 = CV2204
UHF disc-seal triode
6.3
0.4A
-
-
None
A2226 = CV2231
Pulse modulator pentode
6.3
1.20
600
600
200
8.50
B9A+tc
17
A2293 = CV4079
Low impedance triode
6.3
0.95
300
120.0
-
-
375Ω
12.0
B9A
62
A2327 = CV273
UHF disc-seal triode
6.3
0.4A
-
-
None
-
A2521 = CV2453
UHF grounded grid triode
6.3
0.30
130
16.0
-
-
15.0
4.0
15.0
B9A
70
A2599 = CV5242
Low noise UHF triode
6.3
0.30
130
16.0
-
-
15.0
4.0
15.0
B9A
71
A2637
Shunt stabilizer triode
6.3
0.30
25kV
1.0
-
-
7.0
4.5M
0.65
IO+tc
130
+4sns
A2674 = US 436A
High gain tetrode for wideband amplifiers
6.3
0.45
180
23.4
150
9.6
1.4
36.0
32.0
B9D
11
A2688 = CV4081
Low noise VHF triode
6.3
0.37
180
15.5
-
-
3.7
14.00
3.3
68
B7G/F
24
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
A2738
Beam tetrode
6.3
1.27
250
50.0
180
10.0
IO
138
A2744 = CV3527
UHF grounded grid triode
6.3
0.37
130
16.0
-
-
1.0
4.0
15.0
B9A
38
A2792 = CV6097
Shunt stabilizer triode
6.3
0.30
500
1.0
-
-
3.2
95.0
2.50
B9A
93
A2900 = CV6091
Double triode
6.3
0.40*
250
10.0
-
-
10.0
6.2
200
B9A
1
A2913 = CV4107
Low noise VHF triode
6.3
0.37
180
15.5
-
-
3.7
14.00
3.3
68
B7G/F
24
A2975 = CV4120
VHF low noise triode
6.3
0.37
180
15.5
-
-
3.7
14.0
3.3
68
B7G
81
A3042
Power pentode
6.3
1.20
150
50.0
150
4.0
8.50
B9A +tc
17
B21
Class B double triode
2.0*
0.20
150
2.2
-
-
6.0
32.0
12.0
1.6
B7
10
1933
B36
Double triode
12.6
0.30
250
9.0
-
-
8.0
7.7
2.60
IO
26
B65 (= 6SN7)
Medium mu duo triode
6.3
0.60
250
9.0
-
-
8.0
7.7
2.60
IO
26
PW
B109
See Mullard UCC85
-
-
B309
See Mullard ECC81
-
-
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
B319
See Mullard PCC84
-
-
B329/12AU7
See Mullard ECC82
-
-
B339/12AX7
See Mullard ECC83
-
-
B349
Double triode
7.0
0.30
B9A
28
B719
See Mullard ECC85
-
-
B729
Double triode
6.3
0.30
300
10.0
-
-
7.9
5.3
3.40
B9A
39
BG4
Bi-grid FC
4.0*
0.10
25 max
2.6
20
28.0
2.0
4.5
1.00
B5
11
1931
BL62, BL63
Double output triode
6.3
1.27
250
14.0
-
-
16.0
2.86
4.20
IO+tc
28
1939
D.8
Detector triode
0.8*
1.60
150
-
-
21.0
0.67
B4
1
1929
D41
Double diode
4.0
0.30
25 max
-
-
B5
3
1935
D42
Diode for television
4.0
0.60
75 max
-
-
B4
8
1936
D43
Diode for television
4.0
0.60
75 max
-
-
B4
11
1939
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
D63
Double diode
6.3
0.30
100
2.0
-
-
IO
53
1937
D77
See Mullard EB91
-
-
D152
Double diode
6.3
0.30
150
9.0
-
-
B7G
18
DA30
Output triode
(AB1 push-pull)
4.0*
2.00
500
50-110
-
-
145
0.58
6.90
3.4
44
-
B4
1
1935
DA41
Output triode
(Class B push-pull)
7.5*
2.50
1000
44.0 to 280.0
-
-
0
17.0
3.60
7.0
175
-
USM4b +tc
20
1939
DA60
Output triode
6.0*
4.00
500
120.0
-
-
135.0
835Ω
3.00
3.0
10.5
L4
1
1929
DA100
Output triode
(AB1 push-pull)
(AB2 push-pull)
6.0*
2.70
1000
1000
1000
100.0
100/300
100/300
-

-

146.0
200.0
200.0
1410Ω

3.90

6.7
4.0
8.0
30
125
200
1490
-
-
L4
1
1933
1946
1946
DA250
Output triode
(Class A push-pull)
(Class AB1 push-pull)
(Class AB2 push-pull)
10.0*
2.00
2500
2500
2500
2500

100.0
100/360
100/500
-


-



126.0
130-160
130-160
2290Ω


7.00



17.5
12.0
12.0

90
400
800

1260
-
-
4-pin special BC
-
1938
D.E.H.210
General-purpose triode
2.0*
0.10
150
-
-
75.0
0.47
B4
1
1927
D.E.H.410
General-purpose triode
4.0*
0.10
150
-
-
70.0
0.57
B4
1
1927
D.E.H.610
General-purpose triode
6.0*
0.10
150
-
-
65.0
0.62
B4
1
1927
D.E.H.612
General-purpose triode
5.6-6.0*
0.12
40-150
-
-
33.0
0.66
B4
1
1927
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
D.E.L.210
AF or output triode
2.0*
0.10
150
-
-
17.0
0.53
B4
1
1927
D.E.L.410
Detector or AF triode
4.0*
0.10
120
-
-
14.0
0.93
B4
1
1927
D.E.L.610
Detector or AF triode
6.0*
0.10
150
-
-
13.0
1.15
B4
1
1928
D.E.L.612
Detector or AF triode
6.0*
0.12
120
-
-
0-3.5
9.0
1.00
B4
1
1927
D.E.P.215
Output triode
2.0*
0.15
60-120
-
-
1.5-9
6.25
1.00
B4
1
1927
D.E.P.240
Output triode
2.0*
0.40
150
-
-
3.0
1.16
B4
1
1927
D.E.P.410
Output triode
4.0*
0.10
120
-
-
6.25
1.00
B4
1
1927
D.E.P.610
Output triode
6.0*
0.10
150
-
-
4.5
1.55
B4
1
1927
DG2
Bi-grid - Freq. Chang.
Anode bend detector
Grid detector
2.0*
0.20
15-25
40-80
40-80
1.2-2.0
Negl.
1.1-2.4
20
+LT
+LT
11.0
Negl
Negl.
3-4.5
6-15
Rg to +LT
3.75

1.20

B5
11
1931
DH
Detector or AF triode
16.0
0.25
200
6.0
-
-
3.0
10.8
3.70
B5
1
1931
DH30
Double diode triode
13.0
0.30
200
2.8
-
-
2.0
18.0
4.50
B7+tc
7
1934
DH42
Double diode triode
4.0
0.60
250
1.1
-
-
3.0
58.0
1.20
B7+tc
7
1936
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
DH63, DH63M
Double diode triode
6.3
0.30
250
1.1
-
-
3.0
58.0
1.20
250.0
2000
IO+tc
29
1937
DH73, DH73M
Double diode triode
6.0
0.16
250
4.5
-
-
3.0
22.0
2.0
IO+tc
29
1939
DH74
Double diode triode
13.0
0.16
250
1.0
-
-
3.0
58.0
1.20
IO+tc
29
WW2
DH76
Double diode triode
13.0
0.16
250
1.1
-
-
3.0
58.0
1.20
250.0
2000
IO+tc
29
PW
DH77/6AT6
See Mullard EBC90
-
-
DH81
Double diode triode
6.3
0.30
250
1.0
-
-
0.68
58.0
1.20
B8D
17
DH82
Double diode VM triode
6.3
0.30
250
5.0
-
-
3.0
17.0
1.40
B8D
12
DH101
Double diode triode
19.0
0.10
250
1.0
-
-
3.0
58.0
1.20
B8D
12
DH107
Double diode triode
19.0
0.10
-
-
B7G
19
DH109
See Mullard UABC80
-
-
DH118
See Mullard UBC41
-
-
DH119
See Mullard UBC81
-
-
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
DH142
See Mullard UBC41
-
-
DH147
See Mullard EBC33
-
-
DH149/7C6
Double diode triode
6.3
0.15
250
1.3
-
-
1.0
100.0
1.00
B8D
2
DH150
See Mullard EBC41
-
-
DH718
See Mullard EBC41
-
-
DH719
See Mullard EAB80
-
-
DHD
Double diode triode
16.0
0.25
200
3.2
-
-
3.2
18.2
2.20
B7+tc
7
1933
DL
Output triode
16.0
0.25
200
25.0
-
-
8.0
2.66
4.50
7.0
0.60
B5
1
1931
DL63
Double diode triode
6.3
0.30
250
4.0
-
-
3.0
22.5
1.60
IO+tc
29
1939
DL74M
Double diode triode
13.0
0.16
250
5.0
-
-
3.0
22.4
1.65
IO+tc
29
1940
DL82
Double VM triode
6.3
0.30
250
5.0
-
-
3.0
17.0
1.40
B8D
12
1947
DL145
Double diode triode
15.0
0.10
-
-
B8A
9
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
DN41
Double diode output pentode
4.0
2.30
250
40.0
200
8.0
4.4
10.00
5.4
4.5
90
B7+tc
9
1935
DPT
Output pentode
16.0
0.25
200
40.0
200
6.5
10.0
30.0
3.00
6.0
2.0
B5+st
16
1931
DS
RF tetrode
16.0
0.25
200
2.4
70
0.3
1.5
500.0
1.10
B5+tc
2
1931
DSB
RF tetrode
16.0
0.25
200
3.4
80
1.2
1.0
350.0
3.20
B5+tc
2
1931
DSP1
RF pentode
16.0
0.25
200
100
4.00
B7+tc
5
1933
ET1
Electrometer triode
1.0*
0.10
4
6
-
-
2.0
2.0
0.05
0.10
B4
36
1939
G445B = CV1651
Repeater triode
4.0*
0.45
150
-
-
5.0
1.90
B4
1
H.8
RF or RCC triode
0.8*
0.80
150
1.0
-
-
1.5
55.0
0.73
B4
1
1928
H2
Detector triode
2.0*
0.10
150
1.5
-
-
1.5
35.0
1.00
B4
1
1930
H11
Midget AF triode
1.0*
0.10
100
0.6
-
-
2.0
30.0
0.50
Ct4
1
1934
H12
Midget AF triode
2.0*
0.06
100
0.6
-
-
1.5
21.6
1.20
Sm4
1
1938
H30
High-μ triode
13.0
0.30
250
5.5
-
-
1.7
13.3
6.00
B7+tc
23
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
H42
Detector or AF triode
4.0
0.60
250
1.0
-
-
2.0
66.0
1.50
B7+tc
23
1936
H63
High-μ AF triode
6.3
0.30
250
1.0
-
-
2.0
66.0
1.50
200.0
2000
IO+tc
18
1937
H210
Detector or RCC triode
2.0*
0.10
150
1.00
-
-
1.5
50.0
0.70
B4
1
1929
H410
RCC triode
4.0*
0.10
150
0.7
-
-
1.5
60.0
0.66
B4
1
1929
H610
RCC triode
6.0*
0.10
150
0.60
-
-
1.5
60.0
0.67
B4
1
1929
HA1
Acorn UHF triode
4.0
0.25
180
4.5
-
-
5.0
12.5
2.00
5AA
1
1936
HA2
Acorn UHF triode
6.3
0.15
180
4.5
-
-
5.0
12.5
2.00
5AA
1
1939
HD14
Single diode triode
1.4*
0.05
90
0.14
-
-
0
240.0
0.27
IO+tc
91
1940
HD21 (Marconi)
Double diode triode
2.0*
0.20
150
1.8
-
-
1.5
18.0
1.50
B5+tc
5
1934
HD22
Double diode triode
2.0*
0.20
150
1.8
-
-
3.0
18.0
1.50
B5+tc
5
1934
HD23
Double diode triode
2.0*
0.15
150
1.8
-
-
3.0
28.6
1.40
B5+tc
5
1938
HD24
Double diode triode
2.0*
0.10
150
1.1
-
-
1.5
28.6
1.40
B5+tc
5
1939
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
HL.8
General-purpose triode
0.8*
0.80
150
2.20
-
-
4.5
17.0
1.00
B4
1
1928
HL2
HL2K
Detector or AF triode
2.0*
0.10
150
1.75
-
-
3.0
18.0
1.50
B4
1
1931
1934
HL2/c
Detector or AF triode
2.0*
0.10
150
2.2
-
-
3.0
20.0
1.10
B4
1
1931
HL21 (= HL2)
Small triode
-
-
B4
1
1939
HL210
General-purpose triode
2.0*
0.10
150
1.90
-
-
3.0
23.0
0.87
B4
1
1928
HL410
General-purpose triode
4.0*
0.10
150
2.20
-
-
1.5
30.0
0.83
B4
1
1929
HL610
RF or RCC triode
6.0*
0.10
150
1.90
-
-
1.5
30.0
1.00
B4
1
1928
HN309
AF triode & output pentode
12.0
0.30
-
-
B9A
27
KH1
General-purpose triode
3.5
2.00
150
-
-
30.0
1.33
B4+st
25
1927
KL1
Output triode
3.5
2.00
100
-
-
5.5
1.36
B4+st
25
1927
KT2
Output beam tetrode
2.0*
0.20
150
7.5
150
1.7
4.5
2.50
17.0
0.50
B5
6
1937
KT21
Output beam tetrode
2.0*
0.30
150
5.3
150
1.0
2.5
5.30
19.0
0.46
B5
6
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
KT24
Output beam tetrode
2.0*
0.20
150
10.0
150
2.1
2.8
3.20
10.0
0.65
B5
6
1939
KT30
Output beam tetrode
13.0
0.30
250
40.0
250
7.0
12.0
3.90
7.5
2.7
260
B7
24
1937
KT31
Output beam tetrode
26.0
0.30
200
40.0
180
10.6
4.0
10.00
5.5
2.5
80
B7+tc
15
1937
KT32
Output beam tetrode
26.0
0.30
135
75.0
135
5.0
7.6
9.00
1.3
3.5
95
IO
36
1937
KT33
Output beam tetrode
26.0
0.30
200
60.0
200
10.0
13.2
10.00
3.0
5.0
190
IO
36
1937
KT33C
Output beam tetrode
13.0
0.60*
200
60.0
200
10.0
13.3
10.00
3.0
5.0
190
IO
73
1939
KT35
Output beam tetrode
13.0
0.60*
200
50.0
200
8.5
11.5
10.00
4.0
4.2
200
IO
73
1940
KT36
Line t/b output tetrode
26.0
0.30
250
200
11.00
IO+tc
38
PW
KT41
Output beam tetrode
4.0
2.00
250
40.0
250
8.5
4.4
10.50
6.0
4.3
90
B7
24
1937
KT42
Output beam tetrode
4.0
1.00
250
34.0
250
5.5
16.5
2.50
7.0
3.2
420
B7
24
1937
KT44, KT45
Output beam tetrode
4.0
2.00
250
85.0
250
15.0
6.30
B7+tc
37
1939
KT44T = CV1576
Output beam tetrode
4.0
2.00
400max
300max
6.25
B7+tc
37
WW2
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
KT55
Output beam tetrode
Class AB1 push-pull
Triode AB1 push-pull
52.0
0.35

190
200

58.5
120.0

190
-

15.0
-

25.0
22.0

2.0
1.5

25.0
15.0

185
185
IO
73
KT61
Output beam tetrode
6.3
0.95
250
40.0
250
7.5
4.4
10.50
6.0
4.3
90
IO
36
1939
KT63
Output beam tetrode
6.3
0.70
250
34.0
250
5.5
16.5
2.50
7.0
3.0
420
IO
36
1937
KT66
Output beam tetrode
6.3
1.27
250
80.0
250
6.0
16.0
6.30
2.2
8.0
190
IO
36
1937
KT71
Output beam tetrode
48.0
0.16
175
70.0
175
12.0
9.8
10.00
2.5
5.0
120
IO
36
WW2
KT72
Output beam tetrode
15.0
0.16
175
30.0
175
6.0
13.0
2.50
6.0
2.0
300
IO
36
1939
KT73
Output beam tetrode
6.0
0.40
165
33.0
175
6.0
12.5
2.50
6.0
2.0
300
IO
36
1939
KT74
Output beam tetrode
15.0
0.16
170
30.0
175
6.0
13.0
2.50
5.0
2.0
300
IO
36
WW2
KT76
Output beam tetrode
15.0
0.16
175
35.0
175
6.0
13.0
2.50
5.0
2.0
300
IO
36
PW
KT81
Output beam tetrode
6.3
0.95
250
40.0
250
7.5
4.4
10.8
6.0
4.3
90
B8G
10
KT88
Output beam tetrode
6.3
1.6
300
140.0
300
3.0
15.0
12.0
11.55
IO
36
KT101
Output beam tetrode
80.0
0.10
B8G
10
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
KTW61, KTW61M
VM RF tetrode
6.3
0.30
250
8.0
80
2.3
3.0
460.0
2.90
300
IO+tc
8
1939
KTW62 = CV1100
VM RF tetrode
6.3
0.30
250
8.0
100
2.55
2.85
IO+tc
8
WW2
KTW63
VM RF tetrode
6.3
0.30
250
7.6
100
1.5
3.0/40
1.50
250.0
300
IO+tc
9
1938
KTW73M
VM RF tetrode
6.0
0.16
250
6.5
100
1.3
3.0
1.70
IO+tc
9
1939
KTW74M
VM RF tetrode
13.0
0.16
250
7.6
100
1.5
3.0
1.50
IO+tc
9
WW2
KTZ41
TV RF tetrode
4.0
1.50
250
18.0
250
5.3
1.5
12.00
B7+tc
30
1938
KTZ63
RF tetrode
(Connected as triode)
6.3
0.30
250
250
2.0
8.0
100
0.50
3.0
8.0
1.5M
10.5
1.23
1.90
250.0
30.0
1200
1000
IO +tc
8
1937
KTZ63/6J7G
RF pentode
6.3
0.30
250
1.0
100
0.25
2.0
1.5M
1.23
250.0
2200
IO +tc
8
1938
KTZ73M
RF tetrode
6.0
0.16
250
2.0
100
0.25
3.0
1.50
IO +tc
9
1939
L2/b (Marconi)
General-purpose triode
2.0*
0.10
150
6.0
-
-
3.0
10.0
1.55
B4
1
1931
L11
Midget AF triode
1.0*
0.10
100
2.8
-
-
12.0
12.5
0.40
Ct4
A
1934
L12
Midget AF triode
2.0*
0.06
45
2.2
-
-
4.5
6.0
0.80
10.0
12mW
2000
Sm4
1
1938
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
L21
Class B driver triode
2.0*
0.10
150
2.2
-
-
6.0
8.9
1.80
40.0
B4
1
1933
L30
AF triode
13.0
0.30
200
25.0
-
-
8.0
2.86
4.20
6.0
B7
16
1934
L63
General-purpose triode
6.3
0.30
250
9.0
-
-
8.0
7.7
2.60
50.0
800
IO
20
1938
L77
Triode
6.3
0.15
B7G
15
L210
AF triode
2.0*
0.10
150
4.0
-
-
6.0
12.0
0.90
0.06
B4
1
1929
L410
AF triode
4.0*
0.10
150
3.9
-
-
4.5
8.5
1.76
0.07
B4
1
1929
L610
AF triode
6.0*
0.10
150
6.5
-
-
3.0
15.0
2.00
0.07
B4
1
1929
LN119
See Mullard UCL82
-
-
LN152
See Mullard ECL80
-
-
LN309
See Mullard PCL83
-
-
LN319
AF triode & output beam tetrode
13.0
0.30
B9A
27
LP2
Output triode
2.0*
0.20
150
10.0
-
-
4.5
3.9
3.85
7.0
0.15
-
B4
1
1930
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/c (Marconi)
Output triode
2.0*
0.20
150
17.0
-
-
10.5
2.30
2.80
B4
1
1930
LS5B
General-purpose triode
5.25*
0.80
60-400
7.0
-
-
3-9
25.0
0.80
B4
1
1927
LS5X = CV1667
Power triode
6.0*
0.94
400
-
-
5.0
1.20
B4
1
LS6A
Output triode
6.0*
1.60
400
63.0
-
-
91.0
1.3
2.30
5.0
B4
1
1929
LS7 = CV1660
Repeater triode
4.0*
0.15
120
-
-
4.0
5.0
2.00
B4
1
LS7B†
Repeater triode
4.0*
0.15
125
2.7
-
-
2.4
10.0
2.15
B4
1
LS8 = CV1656
Repeater triode
4.0*
0.15
130
-
-
8.0
5.5
1.30
B4
1
LS8A = CV1676
Repeater triode
4.0*
0.15
160
-
-
2.13
2.00
B4
1
LS9B = CV1658
Medium-μ triode
2.0*
0.15
130
-
-
1.5
40.0
0.80
B4
1
LZ319
See Mullard PCF80
-
-
LZ329
Triode pentode FC
9.0
0.30
B9A
25
MH4
MH4
MH4 (Catkin)
Detector or AF triode
(Improved version)
4.0
1.00
200
200
250
2.75
4.5
5.0
-

-

3.0
3.0
4.0
23.0
11.1
11.1
1.50
3.60
3.60


50.0


750
B5
1
1929
1931
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
MH40
High-μ low microphony AF triode
4.0
1.00
200
2.7
-
-
3.0
18.7
2.40
50.0
B5
1
1936
MH41
Detector or AF triode
4.0
1.00
200
5.2
-
-
1.5
13.3
6.00
B5
1
1933
MHD4
Double diode triode
4.0
1.00
200
3.8
-
-
3.0
18.2
2.20
B7+tc
7
1933
MHL4
Detector or AF triode
4.0
1.00
200
200
8.5
7.00
-
-
6.0
6.0
8.0
8.0
2.00
2.50
B5
1
1929
1930
MHLD6 = CV1101
Double diode triode
6.3
0.635
200
11.5
-
-
5.0
7.3
3.00
IO+tc
29
1940
MKT4
Output beam tetrode
4.0
1.00
250
32.0
225
5.0
13.5
3.00
8.0
3.2
365
B5 +st
B7
16
24
1937
ML4
AF or output triode
(Improved version)
4.0
1.00
200
200
19.0
16.0
-
-
22.0
11.0
3.0
2.86
2.00
4.20

7.0

5.0

560
B5
1
1929
1931
ML6 = CV1105
Output triode
6.0
0.70
250
25.0
-
-
3.80
B5
1
WW2
MPT4
Output pentode
4.0
1.00
250
32.0
200
5.0
9.0
40.0
3.00
8.0
8.0
B5 +st
B7
Q
24
1931
1933
MPT4 (Catkin)
Output pentode
4.0
1.00
250
32.0
200
6.0
9.0
40.0
3.00
8.0
8.0
B5 +st
B7
16
24
1933
1933
MPT41
Output pentode
4.0
1.00
250
32.0
200
9.0
6.0
5.50
8.0
B7
24
1933
MS4
RF tetrode
4.0
1.00
200
2.4
70
0.3
1.5
500.0
1.10
B5+tc
2
1929
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
MS4B
MS4B (Catkin)
RF tetrode
4.0
1.00
200
3.4
80
1.2
1.0
350.0
3.20
B5 +tc
2
1931
1933
MSP4
RF pentode
4.0
1.00
250
3.3
100
1.0
1.75
4.00
25.0
400
B5 +tc
B7 +tc
2
5
1933
1933
MSP41
TV RF pentode
4.0
1.00
250
8.5
240
3.2
4.0
3.20
100.0
B5 +tc
B7 +tc
2
5
1936
MX40
Heptode FC
4.0
1.00
mix250
osc150
2.75
2.1
100
1.0
3/30
0.50⅄
B7 +tc
2
1934
N14
Output pentode
1.4*
0.10
90
7.0
90
1.7
7.0
1.55
8.0
0.25
700
IO
78
1940
N15
Output pentode
(Class AB1 push-pull)
1.4*
0.10*
90
90
7.0
12.0
90
90
1.7
4.7
7.0
11.0
1.55
8.0
16.0
0.25
0.56
-
2200
IO
87
1940
N16
Output pentode
1.4*
0.10*
90
9.5
90
1.3
4.5
2.10
8.0
0.27
IO
87
1940
N17
Output pentode
1.4*
0.10*
90
7.4
67.5
1.4
7.0
1.58
8.0
0.27
B7G
6
N18/3Q4
Output pentode
1.4*
0.10*
90
9.5
90
2.1
4.5
100.0
2.15
10.0
0.27
B7G
6
N19
See Mullard DL94
-
-
N25
See Mullard DL96
-
-
N30 (Catkin)
Output pentode
13.0
0.30
250
32.0
250
8.0
15.0
330.0
3.90
7.5
3.0
B7
24
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
N30G
Output pentode
13.0
0.30
250
32.0
250
8.0
15.0
330.0
3.90
7.5
3.0
B7
24
1934
N31 = KT31
Output pentode
26.0
0.30
200
40.0
180
10.6
4.0
10.00
5.5
2.5
80
B7
15
1935
N34
Output pentode
13.0
0.45
250
40.0
250
6.0
10.5
B7
54
N40 (Prototype)
Output tetrode
4.0
1.00
250
32.0
250
7.5
15.0
2.90
7.9
3.5
B5 +st
B7
Q
24
1935
N41 (see KT41)
Output pentode
4.0
2.00
250
40.0
250
10.0
4.4
10.0
5.4
3.5
B7
24
1935
N42 (as KT42)
Output pentode
4.0
1.00
250
34.0
250
6.0
10.5
7.0
2.0
B7
24
1935
N43
AF or video output pentode
4.0
2.00
250
40.0
250
10.0
4.4
10.0
5.4
4.5
90
B7+tc
15
1936
N63 (= KT63)
-
-
N709
See Mullard EL84
-
-
N727/6AQ5
See Mullard EL90
-
-
N77
See Mullard EL91
-
-
N78
Output pentode
6.3
0.64
250
36.0
250
5.0
5.5
40.0
10.0
7.0
4.0
120
B7G
25
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
N108
Output pentode
40.0
0.10
B7G
25
N118
Output beam tetrode
40.0
0.10
180
29.0
150
5.80
6.3
7.50
5.4
2.6
180
B8A
7
N119
See Mullard UL84
-
-
N142
See Mullard UL41
-
-
N152
See Mullard PL81
-
-
N308
Output beam tetrode
25.0
0.30
400
250
IO+tc
129
N309
See Mullard PL83
-
-
N329
See Mullard PL82
-
-
N369
Output beam tetrode
12.6
0.30
170
31.0
180
10.3
10.3
6.70
5.0
2.25
270
B9A
16
N379
See Mullard PL84
-
-
P.8
Output triode
0.8*
0.80
150
10.0
-
-
12.0
6.0
1.00
0.16
B4
1
1928
P2
Output triode
2.0*
0.20
150
19.0
-
-
10.0
2.15
3.50
4.5
0.3
B4
1
1930
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/b (Marconi)
Output triode
2.0*
0.20
150
19.0
-
-
10.0
2.15
3.50
0.3
B4
1
1930
P215
Output triode
2.0*
0.15
150
9.0
-
-
12.0
5.0
1.40
12.0
0.15
B4
1
1929
P240
Output triode
2.0*
0.40
150
17.0
-
-
24.0
2.5
1.60
3.5
0.40
B4
1
1929
P410
Output triode
4.0*
0.10
150
9.0
-
-
10.5
5.0
1.50
12.0
0.17
B4
1
1929
P415
Output triode
4.0*
0.15
150
17.0
-
-
16.5
2.1
2.40
4.5
0.30
B4
1
1931
P425
Output triode
4.0*
0.25
150
17.0
-
-
16.5
2.3
1.90
5.0
0.30
B4
1
1928
P610
Output triode
6.0*
0.10
150
9.0
-
-
9.0
3.5
2.30
8.0
0.15
B4
1
1929
P625
Output triode
6.0*
0.25
250
24.0
-
-
26.0
2.4
2.50
6.4
0.90
B4
1
1928
P625A
Output triode
6.0*
0.25
180
25.0
-
-
39.0
1.6
2.30
6.0
0.80
B4
1
1928
PL500
Line t/b pentode
27.0
0.30
75.0
-10.0
B9D
1
PT2
Output pentode
2.0*
0.20
150
6.5
150
1.9
4.5
50.0
2.50
16.7
0.45
B4 +st
B5
21
6
1931
1931
PT2/k
Output pentode
2.0*
0.20
150
9.5
150
1.9
4.5
50.0
2.50
20.0
0.50
B5
6
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
PT4
Output pentode
4.0*
1.00
250
32.0
250
8.0
16.0
42.0
2.85
7.5
2.0
420
B5
6
1931
PT16
Output pentode
4.0*
1.00
300
53.0
300
10.0
15.0
4.80
15.0
6.3
B5
6
1933
PT25
Output pentode
4.0*
2.00
400
62.5
200
10.6
22.0
25.0
4.00
6.0
10.0
330
B5
6
1933
PT25H
Output pentode
4.0*
2.00
400
62.5
400
12.5
16.0
28.0
6.50
5.0
10.0
250
B5
6
1934
PT235
Output pentode
2.0*
0.35
150
55.0
1.65
B4+st
21
1928
PT240
Output pentode
2.0*
0.40
150
16.0
150
6.0
9.0
55.0
1.65
0.5
B4+st
21
1929
PT425
Output pentode
4.0*
0.25
150
15.0
150
6.1
7.5
50.0
2.00
0.64
B4+st
21
1929
PT625
Output pentode
6.0*
0.25
250
26.5
200
7.0
15.0
43.0
1.85
2.0
B5
6
1929
PX4
Output triode
(Upgraded version)

 (Class A push-pull)
4.0*
4.0*

0.60
1.00

200
250
300
300
50.0
48.0
50.0
100.0
-


-


33.0
34.0
50.0
50.0
1.1


3.30
6.00
6.00
2.8
3.0
3.5
4.0
1.1
2.5
4.5
13.5

[830
1000
1000
B4
1
1929
1931
1946
1946
PX25
Output triode
(Class A single-ended)
(Class A push-pull)
4.0*
2.00
400
500
500
62.5
50.0
100.0
-

-

[ 
31.0
50.0
1265&Omeha;
1265Ω
7.50
7.50
3.20
5.50
10.0
6.0
8.5
20
530
1000
1000
B4
1
1932
1946
1946
PX25A
Output triode
4.0*
2.00
400
62.5
-
-
100.0
580Ω
6.90
4.8
8.4
B4
1
1934
QA2402 (SQ)
See Mullard EL91
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
QP21
QPP double pentode
2.0*
0.40
150
3.5
150
0.9
9.0
2.30
25.0
1.20
B7
11
1934
R417A
VHF triode
6.3
0.30
180
25.0
-
-
25.0
B9A
R5559
Low noise triode
6.3
0.30
150
25.0
-
-
1.5
1.6
25.0
B9A
94
S.8
RF tetrode
0.8*
0.80
150
3.3
80
0-1
200.0
0.80
B4+tc
2
1928
S2
VM RF tetrode
2.0*
0.10
120
6.0
70
2.5
0
1.25
B4+tc
2
1932
S2/c (Marconi)
RF tetrode
2.0*
0.15
150
1.75
60
300.0
1.10
B4+tc
2
1931
S12
Midget RF tetrode
2.0*
0.06
100
2.5
30
0.4
0
700.0
0.70
Sm4
2
1938
S21
RF tetrode
2.0*
0.10
150
2.0
70
1.5
1.5
200.0
1.10
B4+tc
B
1931
S22
RF tetrode
2.0*
0.20
150
2.5
75
1.6
0-1.5
200.0
1.75
B4+tc
B
1931
S23
RF tetrode
2.0*
0.10
150
2.8
70
0.7
0
300.0
1.10
B4+tc
B
1933
S24
RF tetrode
2.0*
0.15
150
3.2
70
1.0
0
300.0
1.40
B4+tc
B
1933
S215
RF tetrode
2.0*
0.15
150
3.00
80
200.0
0.85
B4+tc
B
1928
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
S410
RF tetrode
4.0*
0.10
150
3.80
80
1.0
200.0
1.00
B4+tc
B
1929
S610
RF tetrode
6.0*
0.10
150
4.30
80
1.0
200.0
1.05
B4+tc
B
1929
S625
RF tetrode
6.0*
0.25
150
2.60
80
1.0
170.0
B3+B2
1927
U152
Efficiency diode
19.0
0.30
4kV pk
400 pk
-
-
B9A
18
U153
See Mullard PY81
25.0
0.30
7.5kVpk
720 pk
B9A+tc
34
U309
See Mullard PY80
-
-
U329
Efficiency diode
25.0
0.30
7.5kVpk
720 pk
B9A
34
U339
Efficiency diode
19.0
0.30
5kV pk
600 pk
-
-
IO+tc
128
U349
Efficiency diode
19.0
0.30
5kV pk
450 pk
-
-
B9A+tc
34
VDP1
VM RF pentode
16.0
0.25
200
7.5
100
2.2
0.5/30
2.40
B7+tc
5
1933
VDS
VM RF tetrode
16.0
0.25
200
11.0
80
1.2
0.5/30
250.0
2.40
B5+tc
2
1932
VDSB
VM tetrode
16.0
0.25
200
5.5
80
0.6
1/25
250.0
3.00
B5+tc
2
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
VMP4
VM RF pentode
4.0
1.00
200
5.5
100
1.6
1/30
1M
3.50
B5 +tc
B7 +tc
2
 5
1934
1933
VMP4/k (Catkin)
VM RF pentode
4.0
1.00
250
8.0
100
4.0
0.5/30
1M
2.50
B7+tc
5
1934
VMP4G
VM RF tetrode
4.0
1.00
250
8.0
100
5.0
2/20
2.70
100.0
150
B7+tc
5
1935
VMS4
VMS4
VMS4 (Catkin)
VM RF tetrode
(Improved version)
4.0
1.00
200
200
11.0
10.0
10.0
70
80
80
2.5
2.1
2.1
1.5/40
0.5/30
0.5/30
1.10
2.60
2.60

30.0
30.0
B5+tc
2
1931
1933
1933
VMS4B
VM RF tetrode
4.0
1.00
200
5.2
80
1.3
0.5/15
2.90
30.0
B5+tc
2
1933
VP21
VM RF pentode
2.0*
0.10
150
1.58
60
0.4
0/9
1M
1.10
B7+tc
4
1933
VS24
VM RF tetrode
2.0*
0.15
150
4.4
75
0.2
0/7
250.0
1.50
B4+tc
2
1933
VS24/k
VM RF tetrode
2.0*
0.15
150
4.4
75
0.2
0/9
250.0
1.50
B4+tc
2
1934
W17
See Mullard DF91
W21
VM RF pentode
2.0*
0.10
120
3.6
120
1.2
0/9
1.40
100.0
B4 +tc
B7 +tc
2
4
1937
1937
W25
See Mullard DF96
W30 (Catkin)
VM RF pentode
13.0
0.30
250
12.3
250
6.0
1/30
IM
4.00
100.0
B7+tc
5
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
W31
VM RF pentode
13.0
0.30
200
8.0
100
5.0
2/20
2.70
100.0
B7+tc
5
1935
W42
VM RF pentode
4.0
0.60
250
7.6
100
1.9
3/40
1.50
100.0
B7+tc
6
1936
W61
VM RF pentode
6.3
0.30
250
8.5
80
2.8
3/25
600.0
2.90
IO+tc
8
PW
W63
VM RF pentode
6.3
0.30
250
7.6
100
1.9
3/40
1.50
300
IO+tc
8
1937
W76
VM RF pentode
13.0
0.16
250
7.6
100
1.9
3/40
500.0
1.50
100.0
330
IO+tc
8
PW
W77/9D6
See Mullard EF92
-
-
W81
VM RF pentode
6.3
0.30
B8G
3
1947
W101
VM RF pentode
19.0
0.10
B8G
3
W107
VM RF pentode
12.6
0.10
B7G
22
W118
VM RF pentode
13.0
0.10
B8A
8
W119
VM RF pentode
13.0
0.10
B9A
10
W142
See Mullard UF41
-
-
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
W143
See Mullard EF22
-
-
W145
VM RF pentode
13.0
0.10
B8A
8
W147
See Mullard EF39
-
-
W148/7H7
VM RF pentode
6.3
0.30
B8G
3
W149/7B7
VM RF pentode
6.3
0.15
B8G
3
W150
See Mullard EF42
-
-
W719
See Mullard EF85
-
-
W727/6BA6
See Mullard EF93
-
-
W729
VM RF pentode
6.3
0.30
B9A
10
W739
VM RF pentode
6.3
0.20
B9A
10
WD30
Double diode VM RF pentode
13.0
0.30
250
7.7
100
4.7
1.0
2.60
100.0
B9+tc
I
1935
WD40
Double diode VM RF pentode
4.0
1.00
250
7.7
100
4.7
1/40
2.60
B9+tc
I
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
WD119
See Mullard UBF89
-
-
WD142
See Mullard UAF42
-
-
WD709
See Mullard EBF80
-
-
X14
Heptode frequency changer
1.4*
0.10
mix90
osc90
0.45
45
0.6
0/3
0.25⅄
IO+tc
76
1940
X17
See Mullard DK91
-
-
X20
See Mullard DK92
-
-
X21
Heptode frequency changer
2.0*
0.10
mix150
osc70
0.45
0.60
70
0.6
0/9
0.24⅄
B7+tc
1
1934
X22
Heptode frequency changer
2.0*
0.15
mix150
osc150
1.1
70
0/9
0.35⅄
B7+tc
1
1937
X23
Triode hexode frequency changer
2.0*
0.30
h150
t150
0.7
2.1
60
1.5
0.25⅄
B7+tc
34
1938
X24, X24M
Triode hexode frequency changer
2.0*
0.20
h150
t100
0.7
2.1
60
1.7
1.5
0.25⅄
B7+tc
3
1939
X25
See Mullard DK96
-
-
X30
Heptode frequency changer
13.0
0.30
mix250
osc150
4.0
4.8
100
2.1
3/30
0.75⅄
B7+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
X31
Triode hexode frequency changer
13.0
0.30
h200
t100
1.6
2.2
70
1.5/20
0.55⅄
B7+tc
3
1935
X32 = X30
Heptode FC
13.0
0.30
B7+tc
2
1935
X41,
X41C
Triode hexode frequency changer
4.0
1.20
h250
t100
2.3
2.2
70
4.0
1.5/20
0.55⅄
B7+tc
3
1935
1938
X42
Heptode frequency changer
4.0
0.60
mix250
osc200
3.4
3.8
100
2.6
3/45
0.49⅄
B7+tc
2
1936
X61M
Triode hexode frequency changer
6.3
0.30
h250
t100
3.0
3.3
100
3.0
3/25
0.62⅄
IO+tc
3
1940
X62
TV triode hexode frequency changer
6.3
1.27
250
120
1.5
300.0
1.75⅄
IO+tc
3
1939
X63, X63M
Heptode frequency changer
6.3
0.30
h250
t100
3.4
3.8
100
2.6
3/45
0.49⅄
IO+tc
1
1937
1939
X64
Heptode FC
6.3
0.30
250
3.6
150
9.5
6.0
0.31⅄
IO+tc
2
1937
X65
Triode hexode frequency changer
6.3
0.30
h250
t100
1.75
4.75
100
4.5
3/45
0.23⅄
IO+tc
3
1937
X66 = CV1099
Triode hexode (Selected X65)
6.3
0.30
h250
100
0.23⅄
IO+tc
3
1940s
X71M
Triode hexode frequency changer
15.0
0.16
h250
t100
4.0
3.5
100
3.5
3/25
0.62⅄
IO+tc
3
1939
X73M
Heptode FC
6.0
0.16
mix250
osc100
80
3.0
0.50⅄
IO+tc
1
1939
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
X75
Triode hexode FC
15.0
0.16
250
100
3.0
2.5M
0.225⅄
IO+tc
3
1939
X76M
Triode hexode frequency changer
13.0
0.16
h175
t100
4.0
3.5
70
3.0
3/25
700.0
0.62⅄
IO+tc
3
PW
X78
Triode hexode FC
6.3
0.30
B7G
48
X79
Triode hexode FC
6.3
0.3A
B9A
21
X81/X81M
Triode hexode FC
6.3
0.3A
B8G
8
1947
X101
Triode hexode FC
B8G
8
X109
Triode hexode FC
19.0
0.10
B9A
21
X118
Triode heptode FC"
28.0
0.10
B8A
3
X119
See Mullard UCH81
-
-
X142
See Mullard UCH42
-
-
X143
See Mullard ECH21
-
-
X145
Triode heptode frequency changer
28.0
0.10
mix175
osc175
3.0
5.0
100
6.0
2.5
2.2MΩ
0.65⅄
3.8
B8A
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
X147
See Mullard ECH35
-
-
X148/7S7
Triode heptode FC
6.3
0.30
B8G
8
X150
See Mullard ECH43
-
-
X719
See Mullard ECH81
-
-
X727/6BE6
See Mullard EK90
-
-
Z14
RF pentode
1.4*
0.05
90
1.2
90
0.24
0
1.5M
0.75
IO+tc
77
1940
Z21 = KTZ21
RF pentode
2.0*
0.10
150
2.5
120
0.8
0.5
1.70
100.0
B4+tc
2
1937
Z22
RF pentode
2.0*
0.10
150
2.5
120
0.7
0
1.40
B7+tc
4
1938
Z62
VHF RF pentode
6.3
0.45
300
10.0
150
2.3
2.0
750.00
7.50
IO+tc
8
1939
Z63 (= KTZ63)
RF pentode
6.3
0.30
250
2.0
100
0.50
3.0
1.5M
1.23
2200
IO+tc
8
1937
Z66
RF pentode
6.3
0.63
200
8.0
200
2.0
1.85
1.5M
7.50
180
IO+tc
8
PW
Z77
See Mullard EF91
-
-
1947
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
Z90
RF pentode
6.3
0.30
B7G
1
Z142
See Mullard UF42
-
-
Z145
RF pentode
22.0
0.10
B8A
17
Z152
See Mullard EF80
-
-
Z309
RF pentode
6.3
0.60
B9A
22
Z319
Secondary emission pentode
6.3
0.30
B9A
46
Z329
RF pentode
7.3
0.30
B9A
10
Z359
RF pentode
12.6
0.30
B9A
47
Z719
See Mullard EF80
-
-
Z729
See Mullard EF86
-
-
Z749
RF pentode
6.3
0.30
B9A
10
Z759
RF pentode
6.3
0.60
B9A
48
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
ZA1
Acorn UHF pentode
4.0
0.25
250
2.0
100
0.7
3.0
1.5M
1.40
7AA
1
1937
ZA2
Acorn UHF pentode
6.3
0.15
250
2.0
100
0.7
3.0
1.5M
1.40
7AA
1
1939
ZD17
See Mullard DAF91
-
-
ZD25
See Mullard DAF96
-
-

Negl = Negligible (for DG2)

† From measurements made on four samples

‡ See British Radio Valves: 19261946, Fig 7.2, p109

Rectifiers

Type
Class
Cathode
Va
DC Ia
PIV
DC Vo
Base
Year
 
 
Type
Volts
Amps
Max RMS
mA
Volts
Volts
Type
Ref
Year

 M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
35W4
HW
IH
35.0
0.15
250
100
B7G
33
A2272
EHT
IH
6.3
1.60
5500
100
16kV
B8G+tc
14
A831 (for battery charging)
FW
DH
1.8
2.80
30
1.3A
B4
5
AZ31/U143
FW
DH
4.0
1.10
500
60
IO
60
GU1
HW/MV
DH
4.0
3.00
1000
250
B4
4
1930
GU5
HW/MV
DH
4.0
3.00
1500
250
B4+tc
6
1936
GU12
HV/MV
DH
2.5
5.6
3500
250
USM4+tc
8
GU50
HW/MV
DH
4.0
3.00
1750
250
5200
B4+tc
6
1940
GXU1
HW Xenon
IH
2.5
5.00
3500
250
USM4+tc
8
GXU50
HW Xenon
DH
4.0
3.00
1800
250
B4+tc
6
MU12
FW
IH
4.0
2.50
350
120
B4
5
1933
MU12/14
FW
IH
4.0
2.50
500
120
B4
5
1939
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
MU14
FW
IH
4.0
2.50
500
120
1400
B4
5
1933
Q/U37
EHT
DH
1.4
0.14
5300
0.1
15kV
Wires
Q/U452
EHT
DH
2.0
0.80
5300
0.5
17.5kV
Wires
Q/U456
EHT
IH
6.3
0.225
5300
0.5
17.5kV
Wires
U4
HW
DH
6.0
0.25
220
15
B4
4
1926
U5 = CV3743
FW
DH
5.0
1.60
400
60
B4
5
1926
U6 = CV3744
HW
DH
6.0
2.00
1000
80
B4
4
U8
FW
DH
7.5
2.40
500
120
B4
5
1928
U9
FW
DH
4.0
1.00
250
75
B4
5
1929
U10
FW
DH
4.0
1.00
250
100
222
B4
5
1930
U12
FW
DH
4.0
2.50
350
120
B4
5
1931
U12/14
FW
DH
4.0
2.50
500
120
1400
B4
5
1939
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
U14
FW
DH
4.0
2.50
500
120
1400
B4
5
1931
U15 = CV1266
HW
DH
6.0
2.00
1500
200
L4
3
U16
EHT
DH
2.0
0.25
1.00
5000
5000
2
5
B4+tc
6
1936
1938
U17
EHT
DH
4.0
1.00
2500
30
7100
B4+tc
6
1936
U18
FW
DH
4.0
3.40
500
250
B4
5
1936
U18/20
FW
DH
4.0
3.00
500
850
250
125
2400
B4
5
1939
U19/23
HW
DH
4.0
3.30
2500
250
7100
B4+tc
6
PW
U20
FW
DH
4.0
3.75
850
125
B4
5
1939
U23
HW
DH
4.0
3.30
1750
250
B4+tc
6
U27
EHT
DH
4.0
1.00
5000
50
14kV
B4+tc
6
U29
EHT
DH
2.0
2.75
10kV
20
30kV
B4+tc
6
U30
HW
FW
VD
IH
26.0
13.0
26.0
0.30
0.60
0.30
180
250
220
120
120
75
B7
12
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
U31
HW
IH
26.0
0.30
250
120
IO
55
1937
U33
EHT
DH
2.0
1.00
6300
0.25
B6+tc
6
U37
EHT
DH
1.4
0.14
2
15kV
Wires
U41
EHT
DH
1.25
9.20
12,500
2
IO+tc
58
U35
EHT
DH
1.4
0.12
3500
2
IO+tc
120
U37
EHT
DH
1.4
0.14
2
15kV
Wires
U41
EHT
DH
1.25
9.2
2
12.3kV
IO+tc
58
U43 = Mullard EY51
U45
EHT
IH
6.3
0.20
18,000
0.35
Wires
U50
FW
DH
5.0
2.00
350
125
1000
IO
60
1937
U52
FW
DH
5.0
3.00
500
250
1400
IO
60
1938
U54
FW
IH
5.0
2.80
500
250
IO
62
0.35
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
U60
EHT
IH
6.3
0.265
10,600
4
IO+tc
139
U70
FW
IH
6.3
0.60
325
70
IO
54
1939
U71
HW
IH
30.0
0.16
250
75
IO
55
1939
U74
HW
IH
30.0
0.16
250
75
245
IO
55
WW2
U76
HW
IH
30.0
0.16
250
100
700
270
IO
55
PW
U78 = 6X4
FW
IH
6.3
0.60
325
70
930
B7G
31
U81
FW
IH
6.3
1.60
540
150
585
B8G
24
U82
FW
IH
6.3
0.60
350
75
390
B8G
1
U84
FW
DH
4.0
1.00
240
75
270
B8G
24
U101
HW
IH
50.0
0.10
225
100
275
B8G
25
U107
HW
IH
40.0
0.10
250
90
700
B7G
13
U118
HW
IH
40.0
0.10
250
90
B8A
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
U119 = Mullard UY85
U134
2 x HW
IH
13.0
1.50
350
100
IO
53
1939
U142 = Mullard UY41
U143 = Mullard AZ31
U145
HW
IH
40.0
0.10
250
90
B8A
5
U147 = Mullard EZ35
U149/7Y4
FW
IH
6.3
0.50
325
70
B8G
1
U150 = Mullard EZ40
U151
EHT
IH
6.3
90mA
0.35
17kV
Wires
U152
ED
IH
19.0
0.30
300pk
4000
B9A
18
U153 = Mullard PY80
U154
HW
IH
9.0
0.30
250
180
B9A
18
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
U309 = Mullard PY80
U319 = Mullard PY82
U329
ED
IH
25.0
0.30
720pk
7000
B9A+tc
34
U339
ED
IH
19.0
0.30
150
4500
IO+tc
128
U349
ED
IH
19.0
0.30
450pk
5000
B9A+tc
34
U709 = Mullard EZ81
U718
FW
IH
6.3
0.63
350
90
B8A
14

Tuning Indicators

Type
Heater
Anode
Target
-Vg1
Shadow
Base
Year
 
Volts
Amps
Volts
mA
Volts
mA
max/min
angle x°
Type
Ref
Year

 M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
A1320 = Y65
IO
46
TI 65
6.3
IO
46
1936
Tuneon
165
1.4
SBC
1934
Y25
1.4
0.25
90
60
0.25
0.12
13.5/0
8/0
B8D
9
Y61 = Y63 (Tubular)
IO
46
1939
Y62 = Y64 (Tubular)
IO
46
1939
Y63 (for AC sets)
6.3
0.30
250
0.25
250
4.5
22
IO
46
1937
Y64 (for AC/DC sets)
6.3
0.30
250
0.25
250
4.5
22
0/90
IO
46
1938
Y65 = CV51
6.3
0.30
250
0.25
250
4.5
11
IO
46
Y73
6.0
0.16
180
0.25
180
4.5
21
IO
46
1939
Y119
19.0
0.10
90-250
1.0
1.3/0
B9A
41

Thyratrons

Type
Heater
Anode
Control
fmax
Gas
Base
Year
 
Volts
Amps
Pk Volts
Pk mA
Ratio
KHz
 
Type
Ref
Year

 M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
GT1
4.0
1.30
1000
300
25-30
Mercury
B5
1
1931
GT1A
4.0
1.30
300
300
20
Argon
B5
1
1936
GT1B
4.0
1.35
120
500
10.0
Argon
B5
1
1936
GT1C
4.0
1.30
500
1000
28
8.0
Argon
B5
1
1937
GT1E
2.0
5.00
2000
5A
Mercury
GT3
6.3
0.85
500
300
IO
115

Barretters

Type
Current
Voltage
Base
Year
 
Amps
Min-Max
Type
Ref
Year

 M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
101
0.10
75-150
IO
75
161
0.16
100-180
ES
1
171
0.17
100-200
ES
1
202
0.20
120-200
ES
1
1936
251
0.25
100-180
B4
20
1934
301
0.30
138-221
ES
1
1934
302
0.30
112-195
ES
1
1934
303
0.30
86-129
ES
1
1934
304
0.30
95-165
ES
1
1935
305
0.30
40-90
ES
1
306
0.30
40-90
IO
pins 2&7

Voltage Stabilisers

Type
AV Stab
Striking
Current mA
Regulation
Base
 
Volts
Voltage
Min
Max
Volts
Type
Ref

 GEC - M-OV - Marconi - Osram

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
QS70/20
70
95
2
20
6
B7G
53
QS75/40
75
105
5
40
6.5
IO
74
QS75/60
75
117
5
60
5
B8G
64
QS83/3
83
130
1
5
-
B7G
52
QS92/10
92
140
1
10
5
B4
19
QS95/10
95
110
2
10
5.0
B7G
40
QS105/45
105
130↓
5
45
5.0
B8G
55
QS108/45
108
120↓
5
45
5.0
B8G
55
QS150/15
150
177
3
15
5.0
B7G
40
QS150/40
150
180
5
40
5.5
IO
74
QS150/45
150
170↑
5
45
5.0
B8G
55
QS1200
150
180
5
15
5
B7G
55
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
QS1202
108
133
2
15
3
B7G/F
28
QS1203
150
180
5
15
5
B7G/F
28
QS1205
75
105
5
40
6.5
IO
74
QS1206
108
133
5
40
4
IO
74
QS1207
150
185
3
30
6
B7G
28
QS1208
108
133
5
30
3.5
B7G
28
QS1209
83
125
1
5
1
B7G
28
QS1210
150
165
5
30
5
B7G
28
QS1211
108
133
5
30
3
B7G
28
QS1212
85
115
1
10
4
B7G
28
QS1213
85
115
1
10
4
B7G/F
28
S13013
120
160
6
75
5
B4
12
Click for pin-out: B4 - UX4 - B5 - Ct5 - UX5 - UX6 - B7 - B7G - UX7 - B8A - B8B - MO - IO - Ct8 - Footless - B9 - B9A - B9G - B10B - Others
S130P
120
135§
5
75
7.5
B5
15
ST11
100
140
1
8
5.0
B4
12
STV280/40**
280
420
5
35
-
B5
15
STV280/80**
280
420
10
70
-
B5
15

** Multi-gap types, § With primer taken to 190V, ↓ With primer taken to 150V through 50kΩ, ↑ With primer taken to 200V through 80Ω

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