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