Re: Capacitors. Is physical size important?
I wouldn't use higher voltage rated electrolytics than the original specs called for. They need to see voltages they are designed for to retain their integrity. Something relating to silver oxide inside that's maintained through use. I'm sure someone else will put it more eloquently than I. This doesn't apply to other capacitor types, just electrolytics.
Don't worry about the size, I've replaced loads with modern tiny ones, providing you use decent brands you will find they're better made. (EDIT - not that I've owned stuff long enough to have witnessed that!)
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