Sensibly equivalent¶ to:
The PM2HL battery triode was designed for detector service in broadcast receivers. The two volt filament was for operation from an accumulator, which is typical of radio valves from the 1930s
The classic envelope is 32 mm in diameter and, excluding the B4 base pins, is 82 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:classic 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