Gomerpile1, I think that the SF Homage line likes tube amps with a little drive capability. My SF GH's are a match made in heaven with my ARC D70Mk2 tube amp. They are also great with my ss Rowland, but that amp has 250 watts/ch!
I have heard the Mac 275's on many occasions and I think that it is a very good amp, only question is whether it has enough power to drive your Amati's in whatever size your room is. If it does, then I suspect that this would be a very good match, and preferable to your Mac 252 amp. BTW, I am also a BIG believer in a tube preamp...the preamp is what i would upgrade first.
I have heard the Mac 275's on many occasions and I think that it is a very good amp, only question is whether it has enough power to drive your Amati's in whatever size your room is. If it does, then I suspect that this would be a very good match, and preferable to your Mac 252 amp. BTW, I am also a BIG believer in a tube preamp...the preamp is what i would upgrade first.