The C34 would be the "era" match for the 7270. It's a great preamp. I think the newer ones would be better sonicly plus you get remote control. Your call.
I can't think of any Mac pre that won't match up with a Mac amp impedance wise so I wouldn't worry about the numbers plus there is alot more to it than just the ratio.
I can't think of any Mac pre that won't match up with a Mac amp impedance wise so I wouldn't worry about the numbers plus there is alot more to it than just the ratio.