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.}

 Cosmos

A.45

B

4.5

0.65

30-120

0-6.0

20.0

0.45

9.0

1925

B4

General purpose

DE.11

D

1.1

0.25

20-100

0-6.0

18.0

0.36

6.5

1925

B4

General purpose

SP.18 (red spot)

O

1.8

0.30

20-120

0-6.0

7.5

0.93

7.0

1925

B4

AF amp./output

SP.18 (green spot)

O

1.8

0.30

20-120

17.0

0.88

15.0

1925

B4

General purpose

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

 Cosmos

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

AC/G

General-purpose triode

4.0

1.00

180

-

-

14.0

2.50

C5

1

1927

AC/P1

Output triode

4.0

1.00

200

-

-

2.0

2.50

C5

1

1928

AC/P2

Output triode

4.0

1.00

-

-

2.0

2.50

C5

1

1928

AC/R

Output triode

4.0

1.00

180

-

-

2.5

4.00

C5

1

1927

AC/S

RF tetrode

4.0

1.00

150

800.0

1.50

C5+tt

2

1928

AC/X

General-purpose triode

4.0

1.00

200

-

-

17.0

0.60

C5

1

1928

DE50

General-purpose triode

6.0*

0.09

30-100

-

-

20.0

0.45

B4

1

1927

DE55

General-purpose triode

6.0*

0.09

-

-

18.0

0.50

B4

1

1926

SP16/B

RCC triode

2.0*

0.09

80-120

-

-

70.0

0.50

B4

1

1928

SP16/G

General-purpose triode

2.0*

0.09

150

-

-

17.0

0.95

B4

1

1928

SP16/R

Output triode

2.0*

0.09

100

-

-

10.0

0.90

B4

1

1927

SP18

AF or output triode

1.8*

0.30

30-120

-

-

8.0

0.88

B4

1

1925

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

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

SP18/B

RCC triode

2.0*

0.09

120

-

-

70.0

0.50

B4

1

1926

SP18/G

RF or RCC triode

2.0*

0.30

20-120

-

-

17.0

0.88

B4

1

1925

SP18/R

Output triode

2.0*

0.30

20-120

-

-

0-9

7.5

0.90

B4

1

1925

SP18/RR

Output triode

2.0*

0.30

100

-

-

4.5

1.40

B4

1

1927

SP50/B

RF or RCC triode

6.0*

0.09

-

-

50.0

0.70

B4

1

1927

SP50/R

Output triode

6.0*

0.25

30-120

-

-

4.5

1.70

B4

1

1928

SP55/B

RF or RCC triode

6.0*

0.09

60-120

-

-

55.0

0.64

B4

1

1926

SP55/R

Output triode

6.0*

0.25

-

-

3.5

1.70

B4

1

1926

SP60/B

RCC triode

6.0*

0.09

120

-

-

50.0

0.70

B4

1

1927

SP610/B

General-purpose triode

6.0*

0.10

-

-

24.0

1.50

B4

1

1928

SP610/G

General-purpose triode

6.0*

0.10

-

-

7.5

2.50

B4

1

1928

SP610/RR

Output triode

6.0*

0.10

150

-

-

3.2

2.50

B4

1

1928

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

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

Rectifiers

Type

Class

Cathode

Va

DC Ia

PIV

DC Vo

Base

Year

Type

Volts

Amps

Max RMS

mA

Volts

Volts

Type

Ref

Year

 Cosmos

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

SP41/U

HW

DH

4.0

1.00

250

30

B4

4

1927

SP42/U

FW

DH

4.0

2.00

350

60

B4

5

1927

SP43/U

HW

DH

4.0

2.00

350

75

B4

5

1928

SP45/U

HW

DH

4.0

30

B4

4

1928