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ID = 12577
Great Britain (UK)
Brand: Gecovalve (Geco) = Brand of General Electric (GB)
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to BG4
Similar Tubes
Normally replaceable-slightly different:
  A441N_5pin ; DG407/0 ; DZ1 ; MX40_Fotos ; R43M

Base French Bigrille 5 pin (D) (Codex=Eu)
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =
Description Mit Bigrille-Sockel hauptsächlich in Französischen Radios der 20er Jahre zu finden. 
Information source Taschenbuch zum Röhren-Codex 1948/49   

BG4: DRB 55
Wolfgang Holtmann

tubesockel_klein_bigrillem_4.gif BG4: W.Holtmann
Wolfgang Holtmann

Usage in Models 1= 1927?? ; 1= 1931? ; 2= 1931 ; 9= 1932

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):13

Collection of

Collection of a member from D


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