I keep my amps and pre amp on all the time. I was told by a designer that keeping them on all the time does less damage than the on off cycle. By keeping on the caps and resistors maintain temperature and when pushed by more volume they are already warm. By turning on and off you create a heating and cooling cycle or expansion and contraction. That expansion and contraction can cause cracks that lead to failure. We have been told for years that excess heat is the evil in electrical components. To some degree it is but the heat cool cycle takes the evil to the next step. Example I have my old Sansui 7070 running in my wife’s salon other than power outages it has not been shut off for 25 years and is running strong.
Keep them on and enjoy the music.
Keep them on and enjoy the music.