The 150C1P is a voltage regulator designed for a stabilised voltage of 150 Volts at a current of around 20 mA. The striking voltage is 205 Volts.
Radiomuseum.org says the 150C1 has different connections to the 150C1P but the connections given match the data-sheet for the 150C1. The difference is between a classic shouldered envelope and a tubular glass envelope.
The 150C1K was fitted to an Io base cap.
The pinch with closed cylinder above.
The wide glass tube envelope is 29 mm in diameter, and excluding the Ct8 base pins is 81 mm tall.
References: Datasheet & 3002. Type 150C1P was first introduced in 1939.
Absolute Maximum Operating Conditions¶
Updated March 13, 2014. shape:wide.glass.tube construction:pinch type:voltage.stabiliser age:1930.1940 base:ct8 pins:8 pin:1.- pin:2.- pin:3.- pin:4.- pin:5.k pin:6.- pin:7.- pin:8.a