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ID = 72822
Great Britain (UK)
Brand: Six Sixty (valves), The Electron Company Ltd.; London
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to 6075SG
Similar Tubes
Normally replaceable-slightly different:
  610SG ; PM16 ; S610
Heater different:
  220SG ; 410SG

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Top contact screw type.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.075 Ampere / Direct / Battery =
Information source - - Manufacturers Literature   
History of the British Radio Valve to 1940   p. 151

b4_tetrode~~4.gif 6075SG: Fin Stewart
Fin Stewart

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