Pl advise on Amp for listening to AOR on Klipsch RF7 Mk II via a custom built R2R NOS DAC

Adult Oriented Rock also called Melodic Hard Rock e.g., Andy Rock, Find Me, Free Spirit, Lionville, Raintimes, White Widdow (spelt with an additional 'd'), etc.

Oh! Did not know that. As I don't have tuned ears, it sounded great to me when paired with a Krell and a Concept 16.5 separately. Perhaps because I did not have much exposure to listening to different speakers side by side. By the way, how are Paradigm Signature S8?

Many thanks to you all for kindly guiding me. At the moment, I have three amplifiers viz. Concept 16.5, Krell KAV 250a and NAD C326BEE. All three amps provide decent performance (perhaps a little bright) to my ears. I am thinking 'bout adding a valve based preamp to the Krell. How would it be? Or as advised, I may completely switch over to the tube amps.