This may or may not apply to the Krells but I was told a sign of electrolytics reaching the end of life is you can hear the capacitors make a faint sound when the amplifier is turned off. My old Adcom does that. The noise lasts only a second or so and it’s hard to describe but it is audible if you listen carefully. It almost sounds like you can hear the capacitors discharging. Just something i had read when a similar question was asked in the Adcom circles.
25...30 years, you don't need to really know when to recap. if it works, than you can decide weather you like the performance or not.
regardless, recapping old amp will have similar effect of the new strings on guitar -- fresh and crispy sound. also i would replace output transistors as they also tend to become noisy within same period of time.
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