I had the GP's hooked up to my Rotel RMB-1095 to great effect. Eventually, I re-arranged my systems and now the GP's are run by a Sonic Frontiers Power 1 amp (55 wpc tube). It is so ridicously good that I'm out of the upgrade business. So, if you're worried about power requirements, don't fret. The Rotel will do them justice, and then some. But if you find a Power 1 out there for sale, give it some thought!
Cheers.
Tom
Cheers.
Tom