Upgrades for Rotel RB-991 Power Amp

Hi Guys,

What are the recommendable Capacitors, resistors or any other parts would be recommendable to select for a best possible quality / price ration upgrade to Rotel RB-991 Power Amp. I think they where manufactures starting from 1999

The Amp uses: BHC slit-foil capacitors. It circuit employs Black Gate and Wima capacitors and Roederstein metal-film and Vishay military-grade resistors.

Also, what are the signs to look for if power amps of that age needs upgrades? although is it really necessary to upgrade 1990 + Rotel Amps, meaning would the caps and other parts lose their ability?

Thanks
 
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