Normally, it sets the bias on the output transistors (power output stage). However, without actually seeing the schematic I can only guess. If the bias is too high they will be running with too much current, which generates the heat. That's why Class A amps run hot. Always on, even when idling. They are 'big' amps (for the large heatsinks, transistors, transformer size, etc.), to safely allow for the higher current (heat) compared to Class A/B. Many folks prefer Class A, but I'm generally good with our Class A/B.
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Glenn...
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