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ID = 30196
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Voltage Regulator, single   Power-supply 
Identical to G50/1G = CV2208
Similar Tubes
Normally replaceable-slightly different:
Successor Tubes G50/2G  

Base 3 pin wires in line (1937, B3G) Wires only.

50V at 0.1 to 0.5mA.

Dimensions (WHD)
incl. pins / tip
14 x 40 x mm / 0.55 x 1.57 x inch
Information source Universal Vade-Mecum, Electron Valves and Semiconductor Devices   group 481
-- Original-techn. papers.   

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