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ID = 28977
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Power/Output 
Identical to 4101D = VT31_GPO = CV1638 = SY4101D = 208A = 101DW = 208A_Wecoltd = 101D_Wecoltd = R208-A
Similar Tubes
Normally replaceable-slightly different:
  101D ; 101DW_Wecoltd ; 4101DL
Heater different:

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

Tyne, p 369 quotes the filament current as 0.25A.
Used principally for telephony amplification by British Post Office.

Dimensions (WHD)
incl. pins / tip
59 x 107 x mm / 2.32 x 4.21 x inch
Weight 65 g / 2.29 oz
Tube prices 3 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   page 367-369

4101d_so.png 4101D: ARRL Handbook 1972
Anonymous 10 Collector

Just Qvigstad
4101D: own collection
Peter den Boer

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