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ID = 12447
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: COSEM (C.O.S.E.M.); Saint-Egrève 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 410SG
Similar Tubes
Normally replaceable-slightly different:
  4075SG ; 4SC ; A442 ; RES094
Heater different:
  220SG ; 6075SG ; 610SG
Other base:

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 4 Volts / If 0.1 Ampere / Direct / Battery =

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

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

Just Qvigstad
410SG: own collection
Peter den Boer

Usage in Models 2= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

Collection of



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