My source component and my amps have a standby feature. The manufacturers both recommend turning them off when not listening. They do sound better after fully warm. I turn everything on 30 minutes before starting to listen and we're good to go.
Leave it on?
I just listened to Paul McGowan explain that turning SS equipment on and off degrades the capacitors from the tiny power surge and that leaving SS equipment on ALL THE TIME is best. What do you do?