Please click your language flag. Bitte Sprachflagge klicken.


Information - Help 
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)
Filament Vf 4 Volts / If 1 Ampere / Direct
Description Tyne, p 369 quotes the filament current as 0.25A.
Used principally for telephony amplification by British Post Office. 
Tube prices 3 Tube prices (visible for members only)
Information source Saga of the Vacuum Tube, Tyne   page 367-369
4101D: collection EP
Eduard Pavlik

4101D: ARRL Handbook 1972
Michael Schlör

4101D: own collection
Peter den Boer

from Just Qvigstad

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]