It depends on how the device is built. With the 316 BEE V2 there are heatsinks on the voltage amplification and driver transistors. This is a major step in prolonging the reliability and longevity because the majority of the heat goes to the heatsink and not down the legs of the transistors located on those small heatsinks. When a transistor runs too hot it distorts and heat goes down the legs and dissociates/cracks the solder. Another idea NAD used to keep distortion down and power delivery up is putting the smoothing caps/power supply caps caps right beside the output transistors. But again they will run a bit warmer than if they are located far away from the heatsink. It's a trade-off to have lower distortion to put it all arranged the way they did it and they chose lower distortion and higher bias rather than very cool running. Bias is the voltage applied to the output transistors to ensure they do not turn off at the zero crossover point. If the device runs at a warm hypothetical 50C then it is still 35C below the threshold of 85C for thermal runaway. So there is lots of room remaining for temperature deltas to go even higher. The caps are heating up a bit more too and of course as usual they don't like heat but those heatsinks spread out the heat and make-up for that to a degree.Speaking of heat from the amplifier as addressed in the thread earlier, I'm generally wondering about BEE constructions.
I had a NAD C720BEE receiver and I found it to be much hotter than my other amplifiers.Other than that it was a good receiver, big and ugly but good.
Are all Bjørn Erik Edvardsen constructions more than "normally" warm, hot amplifiers? Maybe it doesn't matter that much, or does it?
I outlined the heatsinks that I mentioned and the location of the smoothing /power supply caps.