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I wish I could explain, but that would maybe best be answered by an engineer. (Hey Tom Ryan or Colortel???) I think it could be that a CRT "gets used to" a certain cathode current, and the cathode coating deteriorates at a certain even pace. Then all of a sudden the temperature is changed due to a different current load (heat): Cathode coating cracks or fails somehow. Just an uneducated guess.
Similarly, a CRT could be excellent for 20 years with regular daily use. Then put the set in a closet unplugged for a year, and wham! Dead CRT. Cathode coating was heated & cooled at a certain pace, then left cold and static for a year. That seems only to be true of 1980s & newer tubes though.
Not that this is any analogy, but it is also my experience that you cannot swap a car battery among cars. It will be fine in one car for years, then put it in another car and it's shot within a month. Different charge & discharge rates between the cars!
Hopefully someone in the know can weigh in on this one!
Charles
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Collecting & restoring TVs in Los Angeles since age 10
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