radiomuseum.org

AC/S2

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ID = 25903
       
Country:
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:
  AC/SG
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
Description

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
Tube Tester Data Avo CT160

Just Qvigstad 		acsg_acs2~~1.png
AC/S2: own collection
Peter den Boer † 2025
Usage in Models 1= 1931 ; 1= 1932? ; 6= 1932 ; 1= 1935 ; 1= 1938??
Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):10

Collection of

Etienne Flemal (B)
Collection of a member from D
Rudolf Osterkamp (D)
Alan Scott Douglas † 16.11.15 (USA)
 
ac_s2_bild1~~2.jpg

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