Siemens Biangulix Tube

Ref. K12

This tube goes back to the1970’s. It is of a classical construction, but its tungsten anode disc is molybdenum backed. It has two focal tracks on the anode surface, and two filaments in line of unequal length corresponding to a large and a small focal spots. The only other available specifications are those on the yellow label.

Note the rough focal tracks on the anode disc surface due to some long use of the tube.

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