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Personally I don't think you need to change out all the tubes--I have found that most old tubes still have plenty of life. The only thing I generally completely replace in old sets are paper capacitors. I change electrolytics only if they appear to be bad.
The real damage from heat is when the heat from tubes overheats and shortens the life of resistors and capacitors. Is this a b/w or color set? Most console b/w sets I've seen don't seem to get excessively hot, as they have fewer tubes that color sets, which always seem to be very hot in the cabinet.
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