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VO

Information - Help 
ID = 21481
       
Country:
France
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 Vacuumtube, Tyne page 401 Photo

Base Europe 4-Pin (A, 4A, B4, since 1914) Sidecontact
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =
  tubeenvdiag_klein_re074d_1~~1.png
  VO: H. Börner
Wolfgang Holtmann
 
vo1.jpg
VO: Ma propre collection , héritage ON4FD
Etienne Flemal

 
2_3~~2.png
VO: Telefunken Werkstattbuch
Wolfgang Bauer

 


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