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I agree with reducing the line voltage. Fan cooling might make the eletrolytics last longer if any are near a large tube. I doubt that fan cooling would make any of the tubes last significantly longer.
Some of the coils in my set had the wax bubbled up. I'm assuming from heat. The Sylvania doesn't have the neck of the CRT sticking out in back so it's possible that previous owners had the set sitting right up against the wall. That would be bad. When I make a proper back for mine I might include a fan just so I can keep it close, but not touching the wall.
John
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