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DW1_Mazda

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ID = 20722
       
Country:
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to DW1_Mazda = E441
First Source (s)
Nov.1929 : L'Histoire Singulière du Tube Radio; G. Duperray 2009

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Parallel, (AC/DC)
 

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