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MX40

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ID = 2538
       
Country:
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 p. 147 & 198
22.Nov.1935 : Wireless World (The), London (WW, 79)

Base British-7-Pin, old (M7A) (Codex=Ne) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Information source The Saga of Marconi Osram Valve   p. 28, 141 & 335
Babani, International Radio Tube Encyclopaedia   p. 120 & 121
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49

mx40_rm.png
MX40: data sheet
Jacob Roschy

165_4.png MX40: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
mx40_spec.png
MX40: Marconi Advertisement
Anonymous 15 Collector

More ...
Usage in Models 2= 1933 ; 2= 1934? ; 13= 1934 ; 3= 1935? ; 20= 1935 ; 14= 1936 ; 1= 1937

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):55

Collection of

 
mx40_045r.jpg

MX40
 

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