I have the MC312 being fed by a Cary SLP-05 tube preamp. Bought it in 2023 and been listening to it most days since then.
It was the perfect amplifier for my system- strong bass when called for, smooth treble and a clear, blooming midrange as well as fast dynamic pace.
I had a Pass Labs XA25 and loved it but it ran out of steam at higher volume levels. My goal was to find that same sound but with more power.
I went through Benchmark AHB2 mono blocks, Pass Labs XA30.8, Parasound a21+ and Parasound JC5 and none of them sounded as good as the McIntosh MC312. Done.