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ID = 36850
Great Britain (UK)
Brand: Cossor, A.C.; London
Developer: Cossor, A.C.; London 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
  Late but no serial production. For instance only development samples. *****
Identical to 210SG = CV1048
Similar Tubes
Multiple differences or of other kind:
First Source (s)
1928 : History of the British Radio Valve to 1940 p.183

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Base on each end.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =

No manufacturers' information has been found for this tube. It is mentioned in some CV registers as equivalent to the CV1048 and also in some circuit details. Later, the CV1048 is recorded as a selected 215SG (CV1018).
It is probable that it was in limited production by Cossor for their radio kits of about 1928. However, it seems not to have been advertised or sold separately.

Further information located in Thrower's book "History of the British Radio Valve to 1940 - the tube was discontinued in 1929. The bases are B2 at one end and B3 at the other.

Information source -- Collector info (Sammler)   
Alan Scott Douglas † 16.11.15

210SG: P.den Boer
Wolfgang Holtmann


from Just Qvigstad

Usage in Models 2= 1928

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

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