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ID = 2538
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  Pentagrid-Converter (Heptode)   Pentagrid (old) 
Identical to MX40 = ACFC4
First Source (s)
1934 : History of the British Radio Valve to 1940

Base British-7-Pin, old (M7A) (Codex=Ne)
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source Taschenbuch zum Röhren-Codex 1948/49   
  MX40: data sheet
Jacob Roschy
MX40: Collection JR
Jacob Roschy

More ...
MX40: Telefunken Werkstattbuch
Wolfgang Bauer

MX40: Marconi Advertisement
Anonymous 15 Collector

from Just Qvigstad

Usage in Models 2= 1933 ; 2= 1934? ; 13= 1934 ; 2= 1935? ; 20= 1935 ; 14= 1936 ; 1= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):54

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