Hi guys,
When replacing those large electroytics, an important component parameter to watch out for in the specification sheet is the capacitor's Effective Series Resistance (ESR). The huge current movement in the capacitor teams up with ESR to generate not only ripple voltage across the plus/minus terminals of the capacitor but also internal heat. It is this internal heat that can contribute significantly to the 'drying out' of the capacitor.
Generally the larger the capacitor value, the lower the ESR for a given brand/series. Basically look to the OEM component selection and match or better the specs but beware of increasing the value of the capacitors to the point where the bridge rectifiers, and the mains transformer, become overly stressed due to the larger caps drawing larger pulses of current on each charge cycle. It's difficult to avoid a domino effect when making changes to a design that has been effectively engineered to begin with.
I really like the idea of matching the transistors, a few challenges there.
Regards
Pat
