Argyro,
Don't assume that you need to change amps. The Parsifal Encore (don't know about the Ovation) presents a moderately difficult load that rules out 300B and low power OTL amps. However, higher power SETs like the Cary 845/211 models work well, as does my higher power ARC VT130SE tube amp. I've had success with ss amps from Krell, Odyssey and TAD, too. I'd certainly try your Mac amp before I switched.
Good Luck,
Marty
Don't assume that you need to change amps. The Parsifal Encore (don't know about the Ovation) presents a moderately difficult load that rules out 300B and low power OTL amps. However, higher power SETs like the Cary 845/211 models work well, as does my higher power ARC VT130SE tube amp. I've had success with ss amps from Krell, Odyssey and TAD, too. I'd certainly try your Mac amp before I switched.
Good Luck,
Marty