Radio Valve Data: 1915-1960

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

Triode Receiver Valves (pre-1926)^*

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.}

 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

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.}

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.}

 M-OV - Marconi - Osram

D.E.7

D

1.8

0.4

6-15

1.5

8-20

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

6-15

1.5

8-20

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

1.0-1.2A

1500

B4

N

2A @ 2.8V

40-80

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.}

4-4.5A @ 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

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

 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
R_g 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