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ID = 20393
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Vacuum Pentode   Power/Output 
Identical to 7A2
Similar Tubes
Normally replaceable-slightly different:
  AC/Pen ; N40 ; Pen4VA ; TE634
First Source (s)
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.2 Ampere / Indirect / Specified voltage AC/DC

Listed in information sources as branded Brimar. Listed on page 66 of th Suoplement to "British Radio valves The Classic Years 1926 - 1946" as Micromesh brand. Also available with 7 pin base.

Information source History of the British Radio Valve to 1940   Brimar P. 144 & 189
Babani, International Radio Tube Encyclopaedia   p. 14 & 15
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

14_7.png 7A2: Telefunken Werkstattbuch
Wolfgang Bauer

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Just Qvigstad
7A2: Brimar Radio Valves 1936
Adrian Riesen

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Usage in Models 5= 1933 ; 5= 1934

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):10

Collection of



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