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4021B

Information - Help 
ID = 13607
       
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 4021B
Similar Tubes
Other class quality (otherwise equal):
  CV1316
Other base:
  S4021A

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Telephony
Filament Vf 4 Volts / If 0.25 Ampere / Direct / Specified current DC = (Series working)
Description

Telephone repeater tube. Original design of this tube has a straight sided bulb and the element structure is at 45 degrees to the base. Designed for series or parallel DC use.

 
Dimensions (WHD)
incl. pins / tip
46 x 120 x 44 mm / 1.81 x 4.72 x 1.73 inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
- - Manufacturers Literature   

lp2_9.png 4021B: Manufacturer's Literature
Emilio Ciardiello


Just Qvigstad

Collection of

Collection of a member from FIN
 
4021b_stc.jpg

 

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