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I think that one's banded; no glass. Only problem is that if it's a rebuilt, it's likely clear glass (no tinting), and it will have a washed-out picture. You can, however, get hold of a tinted separate glass from a set which used a 21FBP22, and just use it with the 21GU and have a nice contrast and color depth. The cataracts seem to start at about age 25, regardless of use or brand. And that's pretty consistent based on my years in old TVs. Even some Sony tubes, which I don't think I realized had bonded glass, from the 80s are starting to show up with cataracts.
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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