It depends on the design of the amplifier,whether the manufacturer pushes it close to the limit or not, and whether it is provided ample heat sinking or trying to save on an undersized heat sink.
My good friend has the legendary Mark levinson class A monoblocks (the ones that weigh a ton). He had them when ML came out with tit, and since then has them CONSTANTLY ON. Yup, never power off, and they are happy campers.
With most amp brands I would be worried, but ML class A ere built to last. With that being said, they can probably use re-capping to sound at their best. Ask how much use did they see. If they were powered on regularly, then the caps are in a much better shape vs amp being off for long periods.
My good friend has the legendary Mark levinson class A monoblocks (the ones that weigh a ton). He had them when ML came out with tit, and since then has them CONSTANTLY ON. Yup, never power off, and they are happy campers.
With most amp brands I would be worried, but ML class A ere built to last. With that being said, they can probably use re-capping to sound at their best. Ask how much use did they see. If they were powered on regularly, then the caps are in a much better shape vs amp being off for long periods.