It depends entirely on how well the amplifier is ventilated. Heat also will work its way from the heatsinks through the chassis so over time the entire amp will get warmer.
Heat in class A equipment
Heat is one of the biggest enemies of electronic equipment. Does anyone know if this Heat is only at the output transistors and their heatsinks o8is it also present in other components within the unit.
I was planning to remove the top cover and with a IR thermometer going to check temps..
Has anyone done this?