The PM2HL battery triode was designed to have the filament powered by an accumulator and the anode circuits powered by a dry cell stack.

This is a small signal amplifier valve and has external metalising as a screen. The valve is of low impedance and low gain. The CV equivalent is CV1050.

The balloon envelope is 33 mm in diameter and, excluding the B4 base pins, is 64 mm tall.

References: Datasheet & ¹⁰⁴³. Type PM2HL was first introduced^¶ in 1938.

 
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	0.1	135	-1.5	2.2	21,500	1.4

Thanks to Andy Cowley for supplying the above PDF datasheet

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