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As miniman82 says, it depends a lot on the particular manufacturer and how good and consistent their processing was. Lots of posts have been made here about particular brands or particular years of particular brands of color tubes that exhibited short life. Don't know if there has been any similar info on monochrome tubes, but probably not due to the people who had the experience being dead by now, plus the fact that even the better really old tubes have reached end of life anyway.
When I was at Motorola in the late 60's, their color tubes were mediocre, but Admiral's were even worse. The Motorola engineers were grumbling about how Motorola would have to eat a lot of warranty costs of CRTs that were sourced from Admiral.
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