I'd get a vintage Crown over a Krell. May not have the 'panache' of a Krell, but they tended to be more 'bomb-proof'.
And as for heat, get a clue. I run 'puter fans on my amps. Quiet, efficient insurance for peace of mind, and cheap. Maybe not 'pretty', but it beats repair costs replacing fried parts.
And....you might give a thought as to why things are getting heated up so.
"Pushing the envelope" in any pursuit tends to push anything to their limits... cars, aircraft, relationships, audio equipment....