Sensibly equivalent¶ to:
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.
Absolute Maximum Operating Conditions¶
Thanks to Andy Cowley for supplying the above PDF datasheet.
Updated January 08, 2013. shape:balloon construction:pinch type:triode age:1930.1940 base:b4 heater:2.0v pins:4 pin:1.a pin:2.g1 pin:3.f pin:4.f