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Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
The anode water cooling jet, is a slot, which coincides with the electron impact area on the anode surface, so the vacuum port was arranged, so that when the tube is fitted into the cabinet, the window facing my film, is one of the original spot focus windows. (The others will be blocked off with small lead discs.)
I ground a small mark on the cathode assembly, to align the filament correctly, for spot focus, out of that window.
The anodes in these tubes are in fact flat, which means, that if I need line focus for anything, I can just loosen up a clamp, and rotate a flange by 90 degrees, or in fact, any geometry in between! The only caveat being, the less efficient cooling of the hot spot (line) on the anode face, since it would be rotated 90 degrees with respect to the cooling jet.
Registered Member #1938
Joined: Sun Jan 25 2009, 12:44PM
Location: Romania
Posts: 701
yes , me too, excellent initiative into restoring these old tubes, but what about trying to build your own design from complete scratch?
I can only guess that I'd have a lot of good time playing with various discharge tubes, filaments, and various metallic targets if I only had a good vacuum pump.
Registered Member #1134
Joined: Tue Nov 20 2007, 04:39PM
Location: Bonnie Scotland
Posts: 351
radhoo wrote ...
yes , me too, excellent initiative into restoring these old tubes, but what about trying to build your own design from complete scratch?
Already done that! Several designs in fact, including flash x-ray tubes, carbon fiber cathode tubes, special windowed tubes, etc, all built using standard flanges. I built a Lenard tube once too, it is somewhere in the project thread on here.
The point of this project, is to re-build the tube, to perform at the manufacturers specification, whilst being fully demountable, which turns out to be much more challenging than any of my other designs. Building x-ray tubes is easy, building it constrained by rules and limits, is hard! Most of the issues have now been addressed, however, since the tube will be run to its original spec, heat dissipation and management still needs solving, and I have yet to replace the cathode filament, which I'm sure will be very entertaining!
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Rebuilding an x-ray tube.
