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ID = 30900
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Western Electric Company Inc.; New York (NY) 
Tube type:  Triode, vacuum 
Identical to CV1638 = 4101D = VT31_GPO = 101D

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Filament Vf 4.5 Volts / If 1 Ampere / Direct
Description This is the CV designated 4101D used by the UK Post Office for telephony repeaters.
Initially designated VT31.
This was manufactured by the British Western Electric Co which became ST&C. It was a UK copy of the WE 101D. 
Literature -- Original-techn. papers.   
CV1638: ARRL Handbook 1972
Michael Schlör


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