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

 Benjamin

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

DE55

General purpose triode

5.5*

0.09

-

-

0-3

18.0

0.50

B4

1

1926

SP18 (blue spot)

RCC triode

1.8*

0.09

80-120

-

-

0

70.0

0.50

B4

1

1926

SP18 (green spot)

RF triode

1.8*

0.30

20-80

-

-

0-3

17.0

0.88

B4

1

1926

SP18 (red spot)

Output triode

1.8*

0.30

60-120

-

-

7.5

0.93

B4

1

1926

SP55 (blue spot)

RF or RCC triode

5.5*

0.09

60-120

-

-

0

55.0

0.64

B4

1

1926

SP55 (red spot)

Output triode

5.5*

0.25

-

-

0-4

3.5

1.70

B4

1

1926

DE55

General purpose triode

5.5*

0.09

-

-

0-3

18.0

0.50

B4

1

1926