Sensibly equivalent¶ to:
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 CV1041 was first introduced in 1933.
Absolute Maximum Operating Conditions¶
Updated December19, 2013. shape:classic construction:pinch type:pentode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.g2 pin:2.g1 pin:3.f pin:4.f pin:tc.a