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ID = 21624
Country:  France      Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
  Tube type:  Triode, vacuum   Universal 
Identical to A9
Similar Tubes Normally replaceable-slightly different:

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If 0.065 Ampere / Direct / Battery = /
Literature Babani, International Radio Tube Encyclopaedia   

A9: CA
Christian ADAM

A9: Telefunken Werkstattbuch
Wolfgang Bauer



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