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I do think that when the sets were "younger", tube related problems were the most common, as other components had not aged enough.
Usually the biggest problem today is age-related problems like bad capacitors, bad wiring, etc. and tube related problems are fewer as the sets have been idle many years and have not been using the tubes.
TV sets seem to be often designed right to the edge of tube capabilities and when the sets are run for 10 or 12 hours at a time every day, some tube failures seem to happen after about a year or so of this kind of use.
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