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ID = 36970
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 610SG
Similar Tubes
Normally replaceable-slightly different:
  6075SG ; PM16
Heater different:
  220SG ; 410SG

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Top contact screw type
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 - - Manufacturers Literature   
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