From my understanding pure class A amps do run a little hot. I would say mine does not run any hotter than my ARC... both can get a little toasty, but not overly so.
I have to say the purity in sound is very satisfying to me.
After we were really putting it through the paces yesterday, for several hours, I could still hold my hand on the heat sinks for 5 seconds. That is the test they recommend to verify that it has enough air flow and ventilation.
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