“Okco” Hot Cathode Tube
Made by the Otto Kiesewetter
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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