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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:  TETRODE (Detail uncertain) 
Identical to DW1_Mazda
Similar Tubes
Normally replaceable-slightly different:
  E442S

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If 1 Ampere
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