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

 Ferranti

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

1A5

Output pentode

1.4*

0.05

90

4.0

90

1.1

4.5

300.0

0.85

25.0

0.115

IO

78

1AB6

See Mullard DK96

1AC6

See Mullard DK92

1AH5

See Mullard DAF96

1AJ4

See Mullard DF96

1C5

Output pentode

1.4*

0.10

90

7.8

90

3.5

7.5

115.0

1.55

8.0

0.24

IO

78

1G6

Double triode

1.4*

0.10

90

1.0

0

45.0

0.68

IO

96

1H5

See Mullard DAC32

1N5

RF pentode

1.4*

0.05

90

1.2

90

0.30

0

750.0

1.5

IO+tc

77

1L4

See Mullard DF92

1R5

See Mullard DK91

1S4

Output pentode

1.4*

0.1*

90

7.4

67.5

1.4

7.0

100.0

1.58

8.0

0.27

B7G

6

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

1S5

See Mullard DAF91

1T4

See Mullard DF91

3C4

See Mullard DL96

3Q5

Output beam tetrode

1.4*

0.1*

90

9.5

90

1.3

4.5

80.0

2.15

10.0

0.27

IO

87

3S4

See Mullard DL92

3V4

See Mullard DL94

6A6

See US

6A7 6A8

Heptode frequency changer

6.3

0.10

mix250
osc100

2.5
3.8

100
 

6.0
 

1.5
 

360.0
 

0.55⅄⅄

USS7+tc
IO+tc

1
1

6AB7

VM RF pentode

6.3

0.45

300

12.5

200

3.2

3/15

700.0

5.0

IO

10

6AB8

See Mullard ECL80

6AC7

RF pentode for Tv

6.3

0.45

300

10.0

150

2.5

2.0

1MΩ

9.0

IO

10

6AJ8

See Mullard ECH81

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

6AK5

See Mullard EF95

6AK8

See Mullard EABC80

6AL5

See Mullard EB91

6AM5

See Mullard EL91

6AM6

See Mullard EF91

6AQ4

See Mullard EC91

6AQ5

See Mullard EL91

6AQ8

See Mullard ECC85

6B8

Double diode & VM RF pentode

3.3

0.30

250

10.0

125

2.3

3.0

600.0

1.33

IO+tc

15

6B8G

Double diode AF pentode

6.3

0.30

250

2.0

125

2.3

3.0

600.0

1.12

IO

15

6BE6

See Mullard EK90

-

-

6BM8

See Mullard ECL82

-

-

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

6BN5

See Mullard EL85

-

-

6BQ5

See Mullard EL84

-

-

6BX6

See Mullard EF80

-

-

6BY7

See Mullard EF85

-

-

6C4

See Mullard EC90

-

-

6C5

Medium-μ triode

6.3

0.30

250

8.0

-

-

8.0

10.0

2.0

IO

20

6CJ5

See Mullard EF41

-

-

6CJ6

See Mullard EL81

-

-

6CK5

See Mullard EL41

-

-

6CT7

See Mullard EAF42

-

-

6CU7

See Mullard ECH42

-

-

6D6

VM RF pentode

6.3

0.30

250

8.2

100

2.0

3.0

800.0

1.6

USS6+tc

2

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

6DA6

See Mullard EF89

-

-

6F6-G

Output pentode

6.3

0.70

285

38.0

285

7.0

20.0

78.0

2.55

7.0

4.8

440

IO

36

6J5

Medium-μ triode

6.3

0.30

250

9.0

-

-

8.0

7.7

2.60

IO

20

6J6

UHF double triode

6.3

0.45

100

8.5

-

-

-

7.1

5.30

50

B7G

17

6J7-G/-GT

AF pentode

6.3

0.30

250

2.0

100

0.5

3.0

1MΩ

1.23

IO+tc

8

6K6

Output pentode

6.3

0.40

250

32.0

250

5.5

18.0

680

2.30

7.6

3.4

470

IO

36

6K7 6K7-G/-GT

VM RF pentode

6.3

0.30

250

10.5

125

2.6

3.0

600.0

1.65

IO+tc

8

6K8-G/-GT

Triode hexode frequency changer

6.3

0.30

mix250
osc100

2.5
1.8

100
 

6.0
 

3.0
 

600.0
 

0.35⅄
 

IO+ tc

4

6L6

Output beam tetrode

6.3

0.90

300

54.5

200

4.6

13.0

33.0

5.20

4.5

6.5

220

IO

36

6N8

See Mullard EBF80

-

-

6Q7-G/-GT

Double diode triode

6.3

0.30

250

1.0

-

-

3.0

58.0

1.20

IO

29

6SA7 6SA7-GT/G

Heptode frequency changer

6.3

0.30

mix250
osc100

3.5
 

100
 

8.5
 

2.0
 

1MΩ
 

0.45⅄
 

IO
IO

6
7

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

6SG7

VM RF pentode

6.3

0.30

250

9.2

150

3.4

2.5/17.5

1MΩ

4.0

IO

14

6SH7

RF pentode

6.3

0.30

250

10.8

150

4.2

1.5

900.0

4.9

IO

14

6SJ7-GT

RF pentode

6.3

0.30

250

3.0

100

0.8

3.0

1MΩ

1.65

IO

10

6SK7-GT

VM RF pentode

6.3

0.30

250

9.2

100

2.6

3/35

800.0

2.0

IO

10

6SL7-GT

Double triode

6.3

0.30

250

2.3

-

-

2.0

44.0

1.60

IO

26

6SN-7GT

Double triode

6.3

0.60

250

9.0

-

-

8.0

7.7

2.60

IO

26

6SQ7-G/-GT

Double diode triode

6.3

0.30

250

0.9

-

-

2.0

91.0

1.10

IO

31

6SS7

VM RF pentode

6.3

0.15

250

9.0

100

2.0

3.0

1MΩ

1.85

IO

10

6U7

VM RF pentode

6.3

0.30

250

8.2

100

2.0

3.0

800.0

1.6

IO+tc

8

6U8

See Mullard ECF82

-

-

6V6-G/-GT

Output beam tetrode

6.3

0.45

315

34.0

225

2.2

13.0

80.0

3.75

8.5

5.5

360

IO

36

7AN7

See Mullard PCC84

-

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

7C5

Output beam tetrode

6.3

0.45

315

34.0

225

2.2

13.0

77.0

3.75

8.5

5.5

320

B8G

10

7C6

Double diode triode

6.3

0.15

250

1.5

-

-

1.0

100.0

1.00

B8G

2

7H7

VM RF pentode

6.3

0.30

250

9.5

250

3.5

2.5

800.0

3.8

B8G

13

7K7

Double diode triode

6.3

0.30

250

2.30

-

-

2.0

44.0

1.60

B8G

21

7R7

Double diode & VM RF pentode

3.3

0.30

250

5.7

100

1.7

1.0

1MΩ

3.2

B8G

13

7S7

Triode hexode frequency changer

6.3

0.3

mix250
osc150

1.8
5.0

100
 

3.0
 

2.0
 

1.25MΩ
 

0.52⅄
 

B8G

8

9A8

See Mullard PCF80

-

-

9AK8 = PABC80

Triple diode triode

9.5

0.30

200

1.0

2.3

50.0

1.40

B9A

2

9AQ8

See Mullard PCC85

-

-

9U8

See Mullard PCF82

-

-

12A6

See Mullard PL81

-

-

12AT7

Double triode

6.3

0.3*

250

10.0

-

-

2.0

11.0

5.50

B9A

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

12AU7

Double triode

6.3

0.3*

250

10.5

-

-

8.5

7.70

2.20

B9A

1

12AX7

Double triode

6.3

0.3*

250

1.2

-

-

2.0

62.5

1.60

B9A

1

12C8-GT

Double diode & VM RF pentode

12.6

0.15

250

10.0

125

2.3

3.0

600.0

1.33

IO+tc

15

12J7-GT

RF pentode

12.6

0.15

250

2.0

100

0.5

3.0

1MΩ

1.23

IO+tc

8

12K7-GT

VM RF pentode

12.6

0.15

250

10.5

125

2.6

3

600.0

1.65

IO+tc

8

12K8-GT

Triode hexode FC

12.6

0.15

mix250
[osc100

2.5
1.8

100
 

6.0
 

3.0
 

600.0
 

0.35⅄
 

IO+tc

4

12Q7-GT

Double diode triode

12.6

0.15

250

1.0

-

-

3.0

58.0

1.20

IO+tc

29

12SC7

Double triode

12.6

0.15

250

2.0

-

-

2.0

53.0

1.30

IO

25

12SJ7

RF pentode

12.6

0.15

250

3.0

100

0.8

3.0

1MΩ

1.65

IO

10

12SL7

Double triode

12.6

0.15

250

2.3

-

-

2.0

44.0

1.60

IO

26

12SQ7

Double diode triode

12.6

0.15

250

0.9

-

-

2.0

91.0

1.10

IO

31

15A6

See Mullard

-

-

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

16A5

See Mullard PL82

-

-

16A8

See Mullard PCL82

-

-

19D8

See Mullard UCH81

-

-

21A6

See Mullard PL81

-

-

25E5

Line t/b output pentode

23.0

0.30

170

100.0

170

8.0

21.0

5.5

5.50

IO+tc

129

25L6

Output beam tetrode

25.0

0.30

200

55.0

110

7.0

8.0

30.0

9.50

3.0

4.3

160

IO

36

35L6-G/-GT

Output beam tetrode

35.0

0.15

200

41.0

110

2.0

8.0

40.0

5.90

4.5

5.3

185

IO

36

42

Output pentode

6.3

0.70

285

38.0

285

7.0

20.0

78.0

2.55

7.0

4.8

440

USS6

8

50L6-G/-GT

Output beam tetrode

50.0

0.15

200

50.0

110

2.0

8.0

30.0

9.50

5.0

4.3

160

IO

36

D4

Detector or AF triode

4.0

1.00

200

4.0

-

-

3.0

12.5

3.30

B5

1

1933

DA

Medium-μ triode

13.0

0.20

200

5.0

-

-

2.0

15.0

3.5

B7+tc

23

1935

DD6

Double diode

6.3

0.30

150

9.0

-

-

-

-

-

B7G

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

DP61/6AK5

RF pentode

6.3

0.175

180

7.7

120

2.4

2.0

700.0

5.10

B7G

14

DS

Medium-μ triode

13.0

0.30

200

4.0

-

-

3.0

17.3

2.50

B7+tc

23

1936

H2D

Double diode triode

2.0*

0.10

100

3.5

-

-

0

15.0

1.30

B5+tc

5

1934

H4D

Double diode triode

4.0

1.00

200

5.5

-

-

2.5

14.5

2.7

B7+tc

7

1933

HAD

Double diode triode

13.0

0.20

200

4.5

-

-

2.0

18.0

2.90

B7+tc

7

1935

HL2

Detector triode

2.0*

0.10

120

4.5

-

-

3.0

10.0

1.40

B4

1

HP2

Class B output triode

2.0*

0.40

120

4.0

-

-

0

8.0

2.0

B7

10

1933

HSD

Double diode triode

13.0

0.30

200

4.6

-

-

3.0

16.0

2.30

B7+tc

7

1934

L2

AF or output triode

2.0*

0.10

120

7.5

-

-

6.0

6.8

1.60

13.6

0.15

B4

1

1933

L4

Output triode (IH)

4.0

1.00

200

19.0

-

-

12.0

3.3

3.20

800

B5

1

LP2

Output triode

2.0*

0.30

150

22.0

-

-

18.0

1.5

3.00

3.5

-

B4

1

LP4

Output triode

4.0*

1.00

250

48.0

-

-

35.0

870Ω

5.40

2.5

700

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

P4

Output triode

4.0*

0.50

250

30.0

-

-

21.0

2.80

1.0

700

B4

1

PT2

Output pentode

2.0*

0.30

120

5.3

120

1.1

4.5

2.60

20.0

0.35

-

B5

6

1935

PT4

Output pentode

4.0

2.00

250

32.0

250

7.0

6.0

7.50

6.5

2.5

150

B7

24

1934

PT4D

Double diode output pentode

4.0

2.00

250
250

32.0
32.0

250
250

7.0
7.0

6.0
6.0

7.50
 

6.5
7.5

2.5
3.5

150
 

B7+tc

9

1934
1935

PTA

Output pentode

13.0
13.0

0.60
0.30

250
250

32.0
32.0

250
250

5.0
5.0

10.0
10.0

4.00
4.00

6.5
6.5

2.5
3.2

250
250

B7

24

1934
1935

PTAD

Double diode output pentode

13.0

0.60

250

32.0

250

5.0

6.0

7.00

6.5

3.3

150

B7+tc

9

PTS

Output pentode

26.0

0.30

250

40.0

200

7.0

5.5

6.00

6.0

3.5

120

B7+tc

15

1934

PTSA

Output pentode

26.0

0.30

250

32.0

250

5.5

9.0

B7+tc

15

PTSD

Double diode output pentode

26.0

0.30

250
250

32.0
40.0

250
200

7.0
7.0

6.0
5.0

6.00
6.00

5.0
6.0

2.5
3.5

 
120

B7+tc

9

1934

PTZ

Output pentode

40.0

0.20

200

40.0

200

7.0

5.5

6.0

3.5

120

B7+tc

15

1935

QPT2

Double output pentode

2.0*

0.40

150

3.0

150

0.9

9.0

2.60

25.0

1.2

-

B7

11

S2

RF tetrode

2.0*

0.15

120

2.25

60

0.3

1.0

300.0

1.10

B4+tc

2

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

SD

Double diode

4.0

0.30

60

1.0

-

-

B5

8

1934

SPT2

RF pentode

2.0*

0.10

120

2.8

120

0.9

0

2M

1.50

B7+tc

4

SPT4

RF pentode

4.0

1.00

200

5.5

100

2.0

1M

2.60

B5+tc

2

1933

SPT4A

RF pentode

4.0

1.00

250

2.0

100

1.0

1.5

3M

2.30

B7+tc

5

1936

SPTA

RF pentode

13.0

0.20

200

2.2

100

0.6

2.5

1.5M

1.40

B7+tc

5

1936

SPTS

RF pentode

13.0

0.30

250

2.0

100

1.0

1.5

3.00

B7+tc

5

1934

VHT2

Heptode FC

2.0*

0.10

mix150
osc120

1.0
0.75

70
 

2.0
 

0
 

750.0
 

0.3⅄
 

B7+tc

1

1934

VHT2A

Heptode FC

2.0*

0.10

mix150
osc70

1.0
0.75

70
 

2.0
 

0
 

750.0
 

0.3⅄
 

B7+tc

1

1935

VHT4

Heptode FC

4.0

1.0

mix250
osc100

2.6
1.2

100
 

5.1
 

3.0
 

500.0
 

0.65⅄
 

B7+tc

2

1933

VHTA

Heptode FC

13.0

0.20

mix250
osc100

2.5
1.1

100
 

5.0
 

3.0
 

500.0
 

0.65⅄
 

B7+tc

2

1935

VHTS

Heptode frequency changer

13.0

0.30

mix200
osc200

2.3
 1.7

100
 

5.3
 

3.0
 

500.0
 

0.7⅄
 

B7+tc

2

1934

VPT2

VM RF pentode

2.0*

0.10

120

1.5

60

0.7

1.5

600.0

1.10

B4+tc
B7+tc

2
4

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

VPT4

VM RF pentode

4.0

1.00

250

5.5

100

3.0

3.0

1M

2.30

B5+tc

2

1933

VPTA

VM RF pentode

13.0

0.20

250

4.2

100

2.0

2.0

1M

2.00

B7+tc

4

1935

VPT4B

VM RF pentode

4.0

1.00

250

6.0

100

3.0

3.0

1M

3.20

B7+tc

4

1936

VPTS

VM RF pentode

13.0

0.30

200

5.5

100

2.0

3.0

1M

2.00

B7+tc

4

1934

VS2

VM RF tetrode

2.0*

0.10

120

2.0

60

0.4

2.5

400.0

1.40

B4+tc

2

1933

ZD

Double diode

7.0

0.20

60

1.0

-

-

-

-

-

B5

8

1936

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Ferranti

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

5R4 See Brimar

5R4GY

FW

DH

5.0

2.00

1000
750

150
250

2,800
2,100

IO

60

5U4-G See Brimar

5V4-G See Brimar

5Y3-GT See Brimar

5Z4-G/GT See Brimar

6BT4

FW

IH

6.3

0.60

350

90

B8A

14

80 See Brimar

6V4 = EZ80 Mullard

FW

IH

6.3

0.60

350

90

B9A

31

6X2

EHT

IH

6.3

90mA

17kV

Wires

6X4 = EZ90 Mullard

6X5-GT See Brimar

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

6W2

EHT

IH

6.3

80mA

0.5

25kV

Wires

7Y4 See Brimar

7Z4 See Brimar

19Y3 = PY82 Mullard

35Z4-GT See Brimar

35Z5-GT

HW

IH

35.0

0.15

240

100

IO

51

80 See Brimar

ER4

EHT

DH

4.0

1.00

5000

4

B4+tc

6

1937

GR4

FW/MV

DH

4.0

3.00

350

325

B4

14

1937

HR1

EHT

DH

0.65

55mA

5000

5

12.5kV

B7G+tc

1

HR2

EHT

IH

4.0

0.50

5500

5

13kV

B7G+tc

22

HR3

EHT

IH

4.0

0.50

5000

15

11.5kV

B7G+tc

22

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

HR6

EHT

IH

4.0

1.25

4500

40

11.5kV

IO+tc

103

HR8

EHT

IH

4.0

1.25

5000
5000

50
40

12.5kV
15kV

IO+tc

103

HR9 (Grid controlled)

EHT

IH

4.0

1.30

20kV

0.75

40kV

IO+tc

131

HR11

EHT

DH

4.0

1.90

14.5kV

3

35kV

IO+tc

120

HR12

EHT

DH

2.5

5.0

25

40kV

USM4+tc

18

OZ4

FW

Cold

300

75

IO

57

OZ4A

FW

Cold

365

85

IO

57

R4

FW

DH

4.0

2.50

350

120

B4

5

1933

R4A

FW

DH

4.0

2.50

500

120

B4

5

1933

R4B

HW

DH

4.0

1.00

400

65

B4

5

R5

FW

DH

5.0

1.60

400

60

B4

5

1933

R41

FW

IH

4.0

1.00

250

60

B4

14

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

R42 = R2 Brimar

FW

IH

4.0

2.50

350

125

B4

14

R43

FW

DH

4.0

3.00

500

250

B4

5

R52 = 5Z4-G

FW

IH

5.0

2.00

350

125

1,450

IO

62

RA

FW

IH

13.0

0.30

250

50

B5

3

1935

RS

HW

IH

20.0
13.0

0.30
0.30

250

75

B5

8

1934
1936

RZ

HW

IH

20.0

0.20

250

75

B5

8

1935

Tuning Indicators

Type

Heater

Anode

Target

-Vg1

Shadow

Base

Year

Volts

Amps

Volts

mA

Volts

mA

max/min

angle x°

Type

Ref

Year

 Ferranti

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

1629

12.6

0.15

250

4.0

250

2.0

8/0

IO

46

FT4

4.0

0.50

200-250

0.5

20/0

IO

46

IM3 = DM70 (Mullard)

VFT4

4.0

0.50

200-250

0.5

6/0

IO

46

VFT6

6.3

0.30

200

4.5

22/0

IO

46

6BR5 = EM80 (Mul)

Thyratrons

Type

Heater

Anode

Control

fmax

Gas

Base

Year

Volts

Amps

Pk Volts

Pk mA

Ratio

KHz

Type

Ref

Year

 Ferranti

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

3C23

2.5*

7.0

1250

6A

USM4+tc

20

GK3

Cold

140

20

B4

18

EN30

Cold

380

250A

IO

124

GK10

Cold

150

10

B7G

56

GK20

Cold

230

30

B7G

56

GK32

Cold

140

20

Caps

GK33

Cold

140

20

Wires

GK40

Cold

150

20

Caps

GK41

Cold

150

20

Wires

GL1

2.5*

7.0

1250

6A

IO+tc

125

GL2

2.5*

3.2

1250

2.5A

IO+tc

132

GN10

Cold

550

250

IO

123

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

GN20

Cold

420

250

IO

123

K3

Cold

150

5

B4

K3A = K3

B4

Voltage Stabilisers

Type

AV Stab

Striking

Current mA

Regulation

Base

Volts

Voltage

Min

Max

Volts

Type

Ref

 Ferranti

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

KD21

75

105

5

40

4.5

IO

74

KD24

105

135

5

40

4.0

IO

74

KD25

150

180

5

40

5.5

IO

74

KD60

62

80

0.1

2.5

0.4

Caps

-

KD61

62

80

0.1

2.5

0.4

Wires

-

KD63

62

100

0.2

2.5

0.5

Wires

-