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Registered Member #135
Joined: Sat Feb 11 2006, 12:06AM
Location: Anywhere is fine
Posts: 1735
I would, but you guys know that im no where skilled enough to do that yet.
He isn't showing some important steps too. Fred Rosebury's book on vacuum devices is a very critical read if you're interested in this. Three of the major things he skipped were Internal Getter, Electropolishing, and Heater treatment.
He does bake out the tube well, but without the internal getter, the tube will be poisoned by the heater evaporating.
He does etch the metal surface which is important to finishing, but in the vacuum devices book it points out how important electropolishing the device is to longevity.
Just reading on how to coat the heating element with the proper oxide mixture blew me away. It's a complicated process and getting the chemicals these days is a struggle.
I'm focused on making Crooke's tubes, but I have to get some Getters together if I hope to have it last more then 20 years without failing. So yes you can do it the way he's doing it, and I would like to also, but it's still more complicated then he's making it look.
Since I cannot get electronic glass, or I might have to contact Corning for it, I have to work with Boro, which means I don't have a lot of options for sealing electrodes. The few are Kovar, Tungsten, and Platinum. But these still require a graded seal, UO glass, which is very rare now, but I do have some. Sealing Tungsten into UO glass by itself is a skill, and I don't yet have a proper oven and my torch annealing skills are poor, so I'm unable as of yet to do these things. Secondly terminating the tungsten to a useful electrode outside of the tube is very problematic. Tungsten wire is difficult to weld and is very brittle, so even IF I seal the device, I may not be able to terminate it properly.
In short, lots of problems.
Maybe when I have my $18,000 Litton Lathe I'll consider starting on it ;p
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amazing glass work
