I think that your experience is in line with diff btwn amps that are Class A (run hot) and A/B, although some A/B amps are biased heavily into class A and will run warm-hot most of the time.
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When I was using the Ayre V5Xe, it ran on the low side of moderately warm. My tube preamp generated a lot more heat. I never drove it hard so I can't speak to its temperature if it was really stressed.
Swampwalker is correct. It has to do with how the amp is biased. A TRUE class A amp runs extremely warm where a class B amp runs cool. AB fits in between and how much it runs into class A. Of course the newer Digi amps run cool.
I have a V-1xe and it seems to run cool to me. I never feel any warmth unless I actually touch the amp itself and then it is only slightly warm at most. I have a large room and the V-1xe sits on the floor so there is plenty of ventilation. Also, I do not play at extreme volumes for long periods of time.