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1920s tubes are more prone to sleeping. When newer tubes are weak they usually are just bad.
Some tubes in a set can be cap casualties...though it isn't always recent. Some sets when the owner decided it was no longer worth repair would run their sets till they literally dropped dead and sometimes would even periodically beat the dead horse to see it it'd go a bit further after collapsing...
Some sets were also less picky about tube quality than others...some of my daily driver sets that get hours per day to hours per week after a few years of that on a service I'd sometimes find many tubes VERY weak despite the stages they drove still working decently (changing those would wake up performance often).
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