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True, but if you know the museum like I do having that many vintage sets running at the same time has about the same effect on the line as a variac does...
I can tell you that some sets do not like high line voltages, some don't care. I had a portacolor and you could run it normally no matter what the line voltage was, because of the type of HV section it had. Early RCA sets don't like high input voltages, because they can and often will cause the flyback to run hot. You can verify by monitoring horizontal output tube cathode current at various line voltages, the worst offenders are sets with silicon B+ rectifiers because they are more efficient than a vacuum tube. It's not hard to go out of spec on horizontal output current, and when you do it's not hard to burn out irreplaceable parts. I'm anal and don't like looking for unobtanioum flybacks, so I never run a set for extended periods without a variac.
Zenith sets tended to be more robust than RCA, so I personally wouldn't worry till line drifts past 120. But again, only way to know if you're in the 'flyback melting danger zone' is to read horizontal output cathode current, and if it's higher than called out in the schematic don't be surprised if things get too hot.
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Evolution...
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