PM6 Azide Triode

The valve on the left is an early example, as can be seen by the white in-fill on the anode indication line. The one on the right is later and has no white in-fill. A power triode valve for audio output. 6 volt, 100 mA filament. Anode voltage 150 V, grid bias -9 V, mu 8 ra 3.55 kOhms. B4 base. Cost 15/- in 1931, equivalent to £117.00 today using average wages! This valve was no longer included in Mullard catalogues by 1934.

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