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Mullard S4VA
Mullard pentode with oxide coated indirectly heated
cathode. 4 volt, 1 A filament. Maximum anode voltage 200, screen
100 V, grid bias -1 volts. Anode current 3.4 mA, screen 1.2 mA, ra
430 kOhms, gm 3.2 mA/V, amplification factor 1500. Cost 34/- in
1931, equvalent to £265 today, using average wage! B5 base plus top
cap. Equivalents AC/SG, MS4B.
PDF Data Sheet