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ID = 20641
Great Britain (UK)
Developer: Mazda = Valve (Tube) brand GB (see also France) 
Tube type:  Triode, vacuum   Audio Frequency 
  Ca. 1925 up to 1945 rare.
Identical to AC/P_Mazda = VT128_GPO
Similar Tubes
Normally replaceable-slightly different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC

Va<200. For Driver, detector or output use.

Information source - - Manufacturers Literature   
Babani, International Radio Tube Encyclopaedia   Pages 48 & 49
L'ABCDaire des lampes de TSF des jeunes années

b5~~11.png AC/P_Mazda: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1929? ; 2= 1929 ; 1= 1932

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

Collection of



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