“Okco” Hot Cathode Tube

Made by the Otto Kiesewetter Company, in Germany, this is a typical Coolidge type X-Ray tube of the twenties. 20” (50cms) long, 4” (10cms) bulb, cooled by a heat radiator mounted on the anode shaft protruding out of the glass tube.

Flat spiral filament inside a cup reflector. Heavy copper anode with a tungsten target.

Before the advent of the “Line Focus” design, the 6 KW output of this tube was about the maximum to be expected from an x-ray tube.

By comparison to early Coolidge tubes, with large 6-8”(15-20cms) bulbs, this type of tube was sometimes referred to as “Baby Coolidge’.

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