Siemens Special Small Focus
Tube
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The tube proper is about 8” (20cms) long and 2.5” (6.2cms) in
diameter. It is an oil immersed, small focus (0.8 mm) tube, fitted with a
hooded anode and a beryllium window, and with a large size external aluminum
heat sink fixed to the anode end of the tube.
The tube is strongly discolored owing to long use, but the filament
tests OK.
The small focus and the relatively large anode fitted with the heat
sink are typical of tubes designed to withstand long exposures with a
relatively low output and intended to give acceptably sharp pictures with
some magnification. These specifications fit perfectly the requirements of
panoramic dental x-ray machines generally rated 50-80 Kilovolts, 10-15 mA, and
exposures of 10-15 seconds.
Note the type number of the tube, starting with the letters “GE”. I
wonder whether this has anything to do with “General Electric” or it is just
a fortuitous coincidence |
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