As others have mentioned, it depends.
All Class A run warm. Many run hot. Some run so hot that they dry out the electrolytic capacitors.
Solution: don't run them hot, use electrolytic caps only in the power supply, and isolate those caps from the heat sinks. Personally, I run the amplifiers' heat sinks at comfortably warm and the power supply at room temperature in a separate rack in another room. That's a bit extreme - but not as extreme as George!
All Class A run warm. Many run hot. Some run so hot that they dry out the electrolytic capacitors.
Solution: don't run them hot, use electrolytic caps only in the power supply, and isolate those caps from the heat sinks. Personally, I run the amplifiers' heat sinks at comfortably warm and the power supply at room temperature in a separate rack in another room. That's a bit extreme - but not as extreme as George!