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MF

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ID = 14505
       
Country:
France
Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
Tube type:  Triode, vacuum   Universal 
Identical to MF
Similar Tubes
Normally replaceable-slightly different:
  B438
First Source (s)
1925 : Saga of the Vacuum Tube, Tyne p.302
Aug.1930 : Philips Bulletin R1164, p. 34

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Description

For resistance-coupled RF and AF stages.

 
Information source Röhren-Vademecum; P.H. Brans; Antwerpen   p. 49
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 98, p. 132
Taschenbuch zum Röhren-Codex 1948/49
Röhrencodex , Röhren-Taschenbuch 1950 23000 Röhren

b4_base_pins~~933.png MF: Fin Stewart
Fin Stewart


Just Qvigstad
 

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