Siemens High Power Tube

Ref. K13

These remains are of a high power glass-metal tube that was offered to me by Siemens while visiting Erlangen in the eighties, but which in spite of careful packing did not withstand uncrated transport.

The model type and specifications are not available, but as far as I remember, it was intended for use in a heart catheterization set-up.  It has two focal spots with two parallel filaments of unequal length. The heavy 5” (12.5 cm) anode has one single track for both foci, and is backed by a thick graphite heat sink enhancing the heat capacity of the anode. The X-ray port of the tube is made of beryllium.

The metal part of the tube looks like copper, but it is probably made of a metal alloy having the same thermal expansion characteristics as the glass part of the tube.

Note the three balancing drill marks peculiarly placed on the surface of the anode, while they are usually found on the rotating cylindrical base of the anode structure.

Could this tube be a variant of the Siemens “Megalix”?