I take my stored amps and turn them on for a day or 2 every 6 months. Every 3 months might be better but really it's just a hassle. Maybe somebody else knows the best compromise.
Electrolytic caps last at least 15 years - even more if temperature is low. They dry-out so keep storage temperature low. It is possible (and often done) to recap whole amplifier if necessary. Other components don't deteriorate.
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