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I usually don't bother to change the FP cans if they're still good, which seems to be most of the time in my limited experience, for quality equipment newer than mid 50s. Cardboard tubular electrolytic caps though are always bad. Those coupling caps put the EL84s in danger, which is why I would change them right away. Some of the others may be okay to leave, especially if they don't have any DC voltage on them in service.i guess it depends on how often you plan to use it and now reliable it needs to be, etc. I have original FP can electrolytics in both my mid sixties daily watcher RCA TV sets without any ill effects.
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