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ID = 55700
Great Britain (UK)
Brand: GEC, General Electric Co Ltd., GENALEX; London
Tube type:  CRT (cathode ray tube, picture tube)   Indication 
Identical to 400C

Base Loctal-9-Pin (B9G)
Was used by Industrial
Filament Vf 4 Volts / If 1.1 Ampere / Half indirect / Specified voltage AC/DC
Description 1.5 inch PDA ES monitor tube.

Available in P1 and P11 phosphors with 01 and 08 suffices to the type number. 

Dimensions (WHD)
incl. pins / tip
40 x 178 x mm / 1.57 x 7.01 x inch
Information source - - Manufacturers Literature   
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