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Radio Valve Data: 1915-1960

Keith R Thrower OBE, The Valve Museum, April, 2022.
    
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Help information: Abbreviations - Explanations - Notes.

 

Imported Triode Receiver Valves*

Type or
Trademark
Filament
Anode
Grid
ra
gm
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
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.

Helicon

Miniwatt
D
3.0-3.5
0.06
20-80
29.00
0.21
6.0
1925Ω
B4

Post-1925 amplifying valves, frequency changers
and signal diodes

Type
Description
Filament
Anode
Auxillary Grid
Grid
ra
gm/go
RL
Po
Rk
Base (1)Pin-out details for non-exhibits can be found with the base details.
Year
 
 
Volts
Amps
Volts
mA
Volts
mA
-V
mA/V
Watts
Ω
Type
Ref
 

 Helicon

 Note: for Loctal B8G read B8B, USS & USM = UX, Y8A = Footless
212
General-purpose triode
2.0*
0.12
-
-
B4
1
1927
216
Output triode
2.0*
0.16
-
-
B4
1
1927
406
General-purpose triode
4.0*
0.06
-
-
B4
1
1927
408
AF triode
4.0*
0.08
-
-
B4
1
1927
415
Output triode
4.0*
0.15
-
-
B4
1
1927
430
Output triode
4.0*
0.30
-
-
B4
1
1927
606
Detector triode
6.0*
0.06
-
-
B4
1
1927
625
Output triode
6.0*
0.25
-
-
B4
1
1927

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