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Do you guys know how Sylvania started out? According to their website, they started out REBUILDING light bulbs! That was back around a hundred years ago. And to think, today we don't even bother to rebuild most picture tubes.
I would assume that for a shadow mask to be replaced they would have to cut the face off the tube? That part (and the respray of color phosphors) is unclear to me.
Some crts are much better than others; often there would just be no financial incentive for a company to build a more stout crt/gun. If it makes it through warranty, who cares? Most of us here have sets from 40, 50, close to 60 years ago that still operate fine with the original crt, while many bottles died after just a few years. Since very few of our old sets are today daily watchers, they don't have to have tons of life left in them.
I used to wonder why the gun & the screen couldn't be in seperate vacuum tubes, so that the gun tube could easily be replaced, but I finally figured enough theory out to understand it just don't work that way!
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Bryan
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