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ID = 55773
Great Britain (UK)
Brand: GEC, General Electric Co Ltd., GENALEX; London
Developer: GEC, General Electric Co Ltd., GENALEX; London 
Tube type:  Geiger-Müller- counter tube 
Identical to GM4LB
Similar Tubes
Other class quality (otherwise equal):
  CV2138 ; GM4

Base SPECIAL TUBEBASE in general
Was used by Technology / Measurement
Filament --/--
Description Low Background Count Version of the GM4

Organically (Ethyl Formate)quenched detector primarily for Beta radiation detection but also suitable for Gamma and X-rays.

Operating Voltage 1250-1450.
Useful life >6x108 Counts. 

Dimensions (WHD)
incl. pins / tip
30 x 122 x mm / 1.18 x 4.80 x inch
Information source - - Manufacturers Literature   July 1961
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