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S4VA

Information - Help 
ID = 12955
       
Country:
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:
  S4150E
Other characteristic (electr. data):
  S4VB
Other base:
  S4VA_UY
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 / Parallel, (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.jpg
S4VA: own collection
John Koster

 
9_46.png
S4VA: Telefunken Werkstattbuch
Wolfgang Bauer

 
uk_mullard_s4va_data.png
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 Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):25


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