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ID = 20329
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   Audio Frequency 
  <1925 very rare. ***
Identical to VT31_GPO = 4101D = 101D = CV1638

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Telephony
Filament Vf 4.5 Volts / If 1 Ampere / Direct / Parallel / series AC/DC

This is the VT designated 4101D used by the UK Post Office for telephony repeaters.
This was manufactured by the British Western Electric Co which became ST&C. It was a UK copy of the WE 101D.

Tube prices 1 Tube prices (visible for members only)
Literature -- Original-techn. papers.   p367, 368 ??
Saga of the Vacuum Tube, Tyne   Pages 367 & 369
British Radio Valves - The Vintage Years, Thrower
VT31_GPO: Fin Stewart
Fin Stewart


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