Nearly all the McIntosh amps I have experienced were on the cool side compared to the average. The MC7200 is the only one I know that tends to run hot. The Stereophile reviewer for the MC501s remarked on how cool they stayed no matter the volume. I would give them a shot.
I think the Bel Canto switching amps run cool too and have good reviews. Arthur
I think the Bel Canto switching amps run cool too and have good reviews. Arthur