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7A3

Information - Help 
ID = 9524
       
Country:
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Vacuum Pentode   Power/Output 
Identical to 7A3 = PenA4
Similar Tubes
Normally replaceable-slightly different:
  A70C ; A70D ; N41 ; Pen4VB

Base British-7-Pin, old (M7A) (Codex=N)
Filament Vf 4 Volts / If 2 Ampere
Description Power Output 3.75W at Va 250V and Ia 32mA. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
 
7a3.jpg
7A3: RFJ
Roy Johnson

More ...
 
551_1.png
7A3: Telefunken Werkstattbuch
Wolfgang Bauer

 

from Just Qvigstad

Usage in Models 1= 1936? ; 3= 1936 ; 1= 1937 ; 1= 1938?

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):6


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