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ID = 50055
Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
Tube type:  Dual-Grid Tetrode   Frequency converter 
  Ca. 1925 up to 1945 rare.
Identical to BigrilleOscillatrice
Predecessor Tubes BigrilleOscill_4pin  

Base French Bigrille 5 pin (D)
Filament Vf 4 Volts / If 0.07 Ampere / Direct / Battery =
Description The designation of this tube is: Bigrille Oscillatrice. Printed on glass: Vf=4, If=0.07, Va=40 
Dimensions (WHD)
incl. pins / tip
49 x 100 x 35 mm / 1.93 x 3.94 x 1.38 inch
Weight 48 g / 1.69 oz

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