The valve is marked CV1041 and the paper label gives PM2M. The CV1041 commercial equivalent is the PM12M. The PM12M is a variable-mu amplifier pentode with a 2 Volt filament.

The filament is for accumulator use and the anode is designed for dry battery operation with a maximum anode voltage of 150 Volts.

The classic envelope is 42 mm in diameter and excluding the B4 base pins, is 106 mm tall.

References: Datasheet & ¹⁰⁴⁰. Type PM12M was first introduced^¶ in 1933.

 
Pin Connections

B4	1	2	3	4	tc
	g2	g1	f	f	a

 
Absolute Maximum Operating Conditions^¶

Triode	Vh	Ah	Va	Vs	Vg	mAa	mAs	gm
	2.0	0.18	150	90	0	2.5	0.5	1.4

PDF scanned from an original document held by the museum

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