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

 PR Products

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

GPR2

RF or detector triode

2.0*

0.10

-

-

24.0

0.56

B4

1

1929

GPR3

AF triode

2.0*

0.10

-

-

12.0

0.75

B4

1

1929

GPR4

RCC triode

2.0*

0.10

-

-

40.0

0.80

B4

1

1929

GPR9

RF or detector triode

4.0*

0.09

-

-

22.0

0.70

B4

1

1929

GPR10

AF triode

4.0*

0.09

-

-

10.0

0.90

B4

1

1929

GPR11

RCC triode

4.0*

0.09

-

-

44.0

0.93

B4

1

1929

GPR17

RF or detector triode

6.0*

0.14

-

-

20.0

0.89

B4

1

1929

GPR18

AF triode

6.0*

0.14

-

-

11.0

0.86

B4

1

1929

GPR19

RCC triode

6.0*

0.14

-

-

75.0

0.55

B4

1

1929

GPR20

Output triode

2.0*

0.15

-

-

6.0

0.87

B4

1

1929

GPR40

Output triode

4.0*

0.15

-

-

6.0

0.87

B4

1

1929

GPR60

Output triode

6.0*

0.15

-

-

6.0

0.87

B4

1

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

GPR120

Output triode

2.0*

0.30

-

-

3.0

1.50

B4

1

1929

GPR140

Output triode

4.0*

0.20

-

-

3.0

1.30

B4

1

1929

PR1 = 206h

RF triode

2.0*

0.06

-

-

30.0

0.46

B4

1

1928

PR2 = 206d

RF or detector triode

2.0*

0.12

120

-

-

28.0

0.46

B4

1

1928

PR3 = 206l

AF triode

2.0*

0.10

-

-

15.0

0.58

B4

1

1928

PR4 = 206rc

RCC triode

2.0*

0.10

-

-

60.0

0.53

B4

1

1928

PR5 = 215h

RF triode

2.0*

0.15

-

-

40.0

0.50

B4

1

1928

PR6 = 215d

Detector triode

2.0*

0.15

-

-

30.0

0.50

B4

1

1928

PR7 = 215l

AF triode

2.0*

0.14

-

-

12.0

0.50

B4

1

1928

PR8 = 406h

RF triode

4.0*

0.06

-

-

23.0

0.58

B4

1

1928

PR9 = 406d

RF or detector triode

4.0*

0.06

-

-

24.0

0.58

B4

1

1928

PR10 = 406l

AF triode

4.0*

0.06

-

-

15.0

0.58

B4

1

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

PR11 = 406rc

RCC triode

4.0*

0.06

-

-

65.0

0.62

B4

1

1928

PR16

RF triode

6.0*

0.10

-

-

19.0

0.95

B4

1

1928

PR17

RF or detector triode

6.0*

0.10

-

-

24.0

0.70

B4

1

1928

PR18

AF triode

6.0*

0.10

-

-

15.0

0.60

B4

1

1928

PR19

RCC triode

6.0*

0.10

-

-

80.0

0.50

B4

1

1928

PR20 = 2P

Output triode

2.0*

0.15

-

-

7.0

0.86

B4

1

1928

PR40 = 4P

Output triode

4.0*

0.15

-

-

8.0

0.75

B4

1

1928

PR60 = 6P

Output triode

6.0*

0.10

-

-

8.0

0.65

B4

1

1928

PR120

Output triode

2.0*

0.30

-

-

3.8

1.05

B4

1

1929

PR140

Output triode

4.0*

0.20

-

-

4.0

1.00

B4

1

1929

SG25

RF tetrode

2.0*

0.20

220.0

0.68

B4+tc

2

1929

Note: The equivalent Britannia types are shown for the PR1 to PR11, PR20, PR40 and PR60 valves

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