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Larger caps won't increase voltage much, if at all. With tube rectifiers, there is a limit due to peak current, but solid state rectifiers have a much higher peak capability. Larger caps may decrease hum - a good thing.
All the tubes can operate on higher voltage than 124V... what matters is dissipation (voltage times current). The two tubes that wear out fastest are the FM converter and the audio output - they're the only ones that run close to their ratings, and will show problems sooner if they become weak. But they are $5 parts - I guess I wouldn't worry about it too much. If you want the tubes to last a REALLY long time, take out the 35C5 and put in a 50C5. Performance may suffer a little, but ALL the tubes will run cooler.
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