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.

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