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I'm with Bob when it comes to the 15G. If you have one with good emissions and getters, it's probably best to leave it alone. After all, it held vacuum for the last 58 years without any help so why fix what isn't broken. If on the other hand you need a rebuild, the full protocal of leak sealing ought to be applied whether it was still under vacuum or not. As proven by the rebuild attempt of John's under vacuum tube, leaks can pop up even if you assume the thing was good before. It still took a full 30 days for John's tube to become gassy, so it may start out good and deteriorate. I think in the future, 15G owners will likely opt to have the tube treated with frit regardless if it was still under vacuum or not.
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Evolution...
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