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ID = 21481
Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
Developer: Grammont (Radiofotos, Fotos); Paris, Malakoff 
Tube type:  Space Charge Tetrode 
Identical to VO
Similar Tubes
Normally replaceable-slightly different:
  A441 ; RE074d ; T_Adzam
First year 1924 ? Saga of the Vacuum Tube, Tyne page 401 Photo

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =
  VO: H. Börner
Wolfgang Holtmann
VO: Ma propre collection , héritage ON4FD
Etienne Flemal

VO: Telefunken Werkstattbuch
Wolfgang Bauer


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