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220SG

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ID = 12427
       
Country:
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 220SG
Similar Tubes
Normally replaceable-slightly different:
  B242
Heater different:
  410SG ; 6075SG ; 610SG
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)
Aug.1930 : Philips Bulletin R1164, p. 16

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Er) Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =
Description

Ra 200k ohms; gm = 1mA/V at Vg=-1.5 and Va=150.
Price 1.1 GBP in 1929.

 
Information source Babani, International Radio Tube Encyclopaedia   p. 30 & 31
History of the British Radio Valve to 1940   p.145 & 183
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49

3_18.png 220SG: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
220sg_data.png
220SG: COSSOR VALVE MANUAL 1935-6
Jose Casas-Avalos

More ...
Usage in Models 2= 1928 ; 1= 1929 ; 1= 1931 ; 1= 1932 ; 1= 1933 ; 1= 1935?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):7

Collection of

 
220sgcossor.jpg

220SG
 

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