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ID = 10740
Great Britain (UK)
Brand: Cossor, A.C.; London
Tube type:  Vacuum Pentode   Power/Output 
Identical to 42MP/Pen
Similar Tubes
Normally replaceable-slightly different:
  N41 ; PenA4
First Source (s)
1934 : History of the British Radio Valve to 1940 p.189

Base British-7-Pin, old (M7A) (Codex=Ndo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 2 Ampere / Indirect / Specified voltage AC/DC
Information source Taschenbuch zum Röhren-Codex 1948/49   
42MP/Pen: Telefunken Werkstattbuch
Wolfgang Bauer

42MP/Pen: Cossor Data Sheet
Roy Johnson

More ...

from Just Qvigstad

Usage in Models 2= 1934 ; 3= 1935? ; 4= 1935 ; 1= 1936?? ; 3= 1936? ; 1= 1936 ; 4= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):18

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