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There were different grades of rebuilt tubes, on the Grade "A" everything except the envelope was new, new phosphor, new Coating inside and out, new Gun and maybe Aluminizing as an upgrade, essentially a new tube.
Cheaper rebuilts just got a new gun, and new outside coating but the Phosphor was reused, and probably somewhat less efficient, possibly with some minor defects in the screen.
Similar to the difference between Remanufactured and Refurbished.
These days I'm happy to get anything, rebuilt, refurbished, used, as long as it's good!
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