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The PM6D dates from 1929 and the valve is described as a highly sensitive detector. The PM series all had oxide (azide) coated filaments.

The dome carries the identification as etched lettering.

The box anode is mounted horizontally. The filament is an 'N' shape.

The grid is wound on notched rods.

The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 90 mm tall.

References: 1931 data-sheet & ¹⁰⁴⁰. Type PM6D was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Andy Cowley for supplying the above PDF datasheet.