Originally Posted by
kevmatic
You could make the argument that computers are better left turned on because of HD spinup and spindown and that their components run very hot, introducing thermal stress.
But receivers have no HDs and don't run as hot as PCs, and the warm up rather slowly, so thermal stress isn't nearly as much of a concern.
What IS a concern are the plethora of large electrolytic caps that they have. Typically more than a PC. They're the most likely to fail in an audio system, and they don't like heat. So turning it off will help lengthen the life of the most fail-happy components in the thing.
The only other thing that could really be affected is the transformer, which experiences significant stress during power on. But they almost never fail unless they're overloaded- after all, they're just copper wire wrapped around a hunk of iron.
So turning it off is better for it.