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ID = 31239
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Photocell Gas filled 
Identical to 20CG

Base Loctal-8, B8G (Sylvania, 1938)
Filament No heater
Dimensions (WHD)
incl. pins / tip
32 x 80 x mm / 1.26 x 3.15 x inch
Information source - - Manufacturers Literature   
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20CG: elektron taschenbuch 1952
Heinz Höger

20CG: Mullard - original papers
Detlef Narten

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