Have heard and had most of the old McIntosh tube amps. The MC225 is nice and people like it a lot. Not so fond of the 240.
But the old tube version of the 275? Now, I've heard one rebuilt and it is just a superb McIntosh amp. If you can get one in good condition, you'd likely be pleased to give it a try in your system.
I'm on some rebuilt custom tube monoblocks now but that old MC-275 is really great.