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3A/108B

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ID = 61504
       
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   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 3A/108B = 4020B = VT79A_GPO
Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Telephony
Filament Vf 2 Volts / If 0.25 Ampere / Direct / Specified voltage AND current AC/DC
Description

Telephone repeater tube

 
Dimensions (WHD)
incl. pins / tip		 46 x 116 x mm / 1.81 x 4.57 x inch
Information source - - Manufacturers Literature   
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Pages 120 & 121
b4_1~~47.png 3A/108B: Fin Stewart
Fin Stewart

Just Qvigstad 		3a108_b_characteristics.png
3A/108B: My schematic colection.
Pier Antonio Aluffi
 
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