I use a Cary tube SL98P with my Mac 501s (driving an old pair of Apogee Duetta II's) and I am extremely satisfied. Very smooth, detailed; much better than the Audio Research LS2B I was using previously.
BTW, I A-B tested the MC2200 vs. the Cary and liked the Cary much better. Listen to a good recording of a horn section or viola and hopefully you'll know what I mean...
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