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3A/108A

Information - Help 
ID = 59253
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Developer: Standard Telephones and Cables Ltd. (STC); London, Foots Cray 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to 3A/108A = VT73A_GPO = CV1653 = 4020A
Similar Tubes
Other shape (e.g. bulb type):
  4631 ; CV1311 ; CV1664

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Telephony
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Battery =
Description

High Impedance triode

Ra, 50,000 ohms ; Gm 0.6 mA/V

 
Information source Babani, International Radio Tube Encyclopaedia   
-- Original-techn. papers.   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
 
3a_108a_stc.jpg
3A/108A: My tubes
Anonymous 413 Collector

 
uv~~5.png
3A/108A: Fin Stewart
Fin Stewart

 

from Just Qvigstad

Collection of a member from FIN

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