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ID = 12955
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Screen-grid Tetrode   RF/IF-Stage 
Identical to S4VA
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
Other base:
Predecessor Tubes S4V  
Successor Tubes S4VB  

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Fc) Top contact screw type.
Filament Vf 4 Volts / If 1 Ampere / Indirect / Specified voltage AC/DC
Description Ra = 430k ohms. gm 3.5mA/V at Va=100, Vs=75 and Vg=0

Higher impedance and gain than the S4VB 

Information source Taschenbuch zum Röhren-Codex 1948/49   
Experimental Wireless & Wireless Engineer   Mullard Advertisement July 1931
S4VA: own collection
John Koster

S4VA: Telefunken Werkstattbuch
Wolfgang Bauer

S4VA: Mfg. data sheet
Jay Kinnard

from Just Qvigstad

Usage in Models 5= 1930 ; 10= 1931 ; 1= 1932?? ; 2= 1932? ; 3= 1932 ; 2= 1933? ; 2= 1934?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):25

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