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ID = 25903
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Developer: Mazda = Valve (Tube) brand GB (see also France) 
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
  Ca. 1925 up to 1945 very rare. ***
Identical to AC/S2 = VT109_GPO = CV1677
Similar Tubes
Normally replaceable-slightly different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.1 Ampere / Indirect / Specified voltage AC/DC

Va <200. Vg2<80. Gm =3.4 High gain version of AC/SG.

Information source - - Manufacturers Literature   Grundig Röhren-Taschenbuch, 1948
Babani, International Radio Tube Encyclopaedia   Pages 48 & 49
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
- - Manufacturers Literature

Just Qvigstad
AC/S2: own collection
Peter den Boer

Usage in Models 1= 1931 ; 6= 1932 ; 1= 1935 ; 1= 1938??

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):9

Collection of



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