Tube amp recommendations to drive Paradigm Tributes

I am looking for recommendations for a decent reasonably priced Class A / Tube amplifier for my listening room. I currently have an integrated Peachtree Nova500 driving a pair of Paradigm 30th Anniversary Tributes.  The Nova supposedly outputs 500 watts per channel (into 8 ohms). The Tributes specs say impedance is  "compatible with 8ohms" I'm not exactly sure what that means. Regardless, the system sounds very good and I enjoy it. However I am very curious about class A/tube amps. Last year I listened to a Bob Carver Crimson 275 amp and was very impressed. I wonder if that would be a good match for the Tributes. Any input would be appreciated.