PS Audio HCA-2 amp and matching PCA-2 preamp. Dirt cheap on the used market and fabulous at driving my Acoustat 2+2's, having replaced a McIntosh MC7300, Acoustat TNT-200, and Hafler 9505. No heat, no hum, no noise.. just incredible detail and dynamics from top to bottom.
Of course, if I had the budget I'd be all over the new PS Audio GCC-500.
Of course, if I had the budget I'd be all over the new PS Audio GCC-500.