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I respect all these opinions, but I have personally had CRTs with a broken tip re-evacuated (and cooked in the oven) and they worked fine. I was advised that it might be a waste of money, but it did work. One was an 8" Arvin metal tube which had a metal tip that leaked, the other was a 21" B&W bakelite base tube. No phosphor problems, but the 21" did get a new gun. When they cook the tube, it forces the air, gases, and moisture out while they evacuate. The Arvin gun was still OK, although maybe a little less emission. In another case, I had a Sony 30" Trinitron CRT rebuilt after it had the neck cracked and lost vacuum. That one too got a new gun, since they were cheap and available. But again, no stains or phosphor problems.
I also had a 21AXP22 rebuilt after being with lost vacuum for a long time. It worked fine, but lost vacuum again.
As far as the pressure band, I have heard both ways on that. In theory, it shouldn't implode. The band is applied AFTER the tube is evacuated, and often my local rebuilder (Dunbar Sales in Los Angeles) would store the tubes without the band, so that they could slap it on with whatever mounts were needed for a particular request. The newer tubes all have the pressure band holding the mounts on, not like the older ones which had the pressure band plus another screw-tight band for the mounts. I'll stay on the fence on this issue of what happens when the band is cut off after the tube is evacuated, as I haven't done it (and DON'T PLAN TO).
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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