Quote:
Originally Posted by miniman82
I had an idea on how to fix it, though I must admit I think more like a machinist than the electrician I really am. Sometimes that can be a good thing, though I have yet to lay hands on a 15GP22.
Seems to me the welded seal is the problem for many of the tubes, so why not get rid of it entirely? I mean, if there's a metal rim embedded into the glass, could you not just trim it back flush with the glass, then mate the 2 glass parts of the CRT together the same way neck glass is attached?
One other thing that I wonder about, is why if the metal part was leaking would you attempt to fix the leak by any other process but welding? I mean really, if 1954 welders could do the entire tube rim with a TIG torch, what's stopping those with rim leaks from sealing up a little pinhole? Is it really that difficult, or do tube people really not think that way RCA did back then?
To me, even difficult problems usually have very simple solutions...
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And yes, you need to "lay your hands" on a 15G in order to appreciate the complexity of the issues involved. It has taken John and I more than 2 years of constant trial and error discoveries, to figure out where the problems are and how best to resolve them. It may look simple on the surface, but take my word for it, the issues are very complex indeed.
We will also have two 15G's on display at the ETF convention that were broken during our experiments. One tube has the entire glass rear section removed so you can get up close and personal with the shadow mask, and the other tube has the entire front cover glass and the decorative mask removed, so you can get up close and personal with the phosphor dot plate.
I am presently interviewing local welders to find someone with the talent to weld leaks that we have found in the Kovar TIG weld which fastens the two halves of the Kovar ultor flange. But only a small percentage of the 15G leaks occur at the weld line. Most leaks occur in the glass to Kovar bond or in two other Kovar to Kovar bonds, which I will explain in more detail in my presentation at the ETF convention.
Be there or Be square!