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Mullard PM12
Mullard screen grid valve with top cap anode,
present in 1931 catalogue (Cost 27/6 = £214 today, based on average
wage). 2 volt filament, maximum anode voltage 150 V. Screen voltage
75 V, grid bias 0 V, 2.5 mA anode current, 0.5 mA screen, gm 1.4.
Amplification factor 200, Impedance (ra) 212 kOhms. Base B4. The
PM14 and PM16 are equivalents with 4
and 6 volt filaments.
High Resolution PDF Datasheet :- PM12, PM14, PM16