The PM stands for Philips-Mullard and were introduced in 1925. The PM2A is a later addition to the original range probably from 1929. The series all had oxide coated filaments.

These audio valves could drive a small loudspeaker. The PM2A had a rating of 0.15 Watt at 5% distortion.

The balloon envelope is 43 mm in diameter and, excluding the B4 base pins, is 85 mm tall.

 
Pin Connections

B4	1	2	3	4
	a	g1	f	f

 
Absolute Maximum Operating Conditions

Triode	Vh	Ah	Va	Vg	mAa	ra	gm
	2.0	0.2	135	-6	5.0	6,000	2.0

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This exhibit was last updated on 02 December 2007