Philips Type K Kenotron

Ref. F6

This tube is 16” (40 cm) long without the radiator and has a four-inch (10 cm) strongly discoloured bulb.

Dating probably to the thirties or late twenties of the twentieth century, its country of manufacture remains unspecified and is marked “FOREIGN”.

Its ratings can reach up to 125 kV and 300 mA. It has a multi-layer heat radiator on the anode end.