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I notice this thread return today. I have a comment on electrolytics.
Earlier this year I opened up and checked the electrolytics on a ~1975 device I have that has run with no repairs for over 250000 hours. They check out fine, low leakage, low ESR, and within spec capacitance. This set ran continuously except for long vacations for over 30 years. It is a Hafler 280 watt audio amp. I also checked the amp's performance, and it meets specs.
Just to be sure, the words are "two hundred fifty thousand hours". The caps are mounted well away from the transformer and heat sinks, and it has been well ventilated.
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