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They still work because they were only used a year or so, then sat dormant for the next 45. It's not because they were designed better, they simply weren't used as much. I have the opposite experience, actually. My CTC-4 was run into the ground; it went through a pair of 21AXP22's from new, then a third was installed in 1976 but went to air when the set was finally laid to rest. I picked it up from the original owner's home in Indy, then waited for a good tube to turn up.
Most B&W sets I run across are absolutely beat. I recently got a Zenith 12" set with metal tube and while it wasn't aired, there was a brightener on it and it had 0 emission even after whacking it 3 times on max rejuve.
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Evolution...
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