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The PM1LF is part of the first series of Philips-Mullard valves. The filament has an oxide coating applied by the Azide process. The PM1LF was introduced in 1926 as an AF amplifier. The µ or amplification factor is nine.

The balloon envelope is 40 mm in diameter and, excluding the B4 base pins, is 73 mm tall.

References: 1931 data-sheet & ¹⁰⁴³. Type PM1LF was first introduced in 1926. See also 1926 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Andy Cowley for supplying the above PDF datasheet.