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ID = 20032
Brand: Grammont (Radiofotos, Fotos); Paris, Malakoff
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to MX40_Fotos
Similar Tubes
Normally replaceable-slightly different:
  A441N_5pin ; BG4 ; DG407/0 ; DZ1 ; PM4DG ; R43M ; TA31
Other base:

Base French Bigrille 5 pin (D)
Filament Vf 4 Volts / If 0.12 Ampere / Direct / Battery =
Description Mit Bigrille-Sockel hauptsächlich in Französischen Radios der 20er Jahre zu finden. 
Information source - - Manufacturers Literature   2-9-1933

MX40_Fotos: DRB 55
Wolfgang Holtmann

tubesockel_klein_bigrillem_5.gif MX40_Fotos: W.Holtmann
Wolfgang Holtmann

MX40_Fotos: own collection
Peter den Boer

Usage in Models 1= 1926? ; 1= 1927?? ; 1= 1927? ; 1= 1927 ; 1= 1930

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):5

Collection of



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