I owned MC275 - it’s ok, but not amazing IMO. All McIntosh gear uses too much global feedback. If I was to choose from the above I’d go for the MC462.
I’ve tried loads of pre and amp combinations.
Most solid state amps use too much global feedback and have too complex circuits to let a tube pre really show what it’s all about.
I’d say go integrated hybrid tube amp - look at Pathos. Way way better than MC275.

