Leaving my amplifier on ok?

Is your amp Class A?  If so the answer is obvious unless it has a low bias switch (like Plinius SA103, some Clayton amps, etc.).  I recently had my McCormack Class A/B amp upgraded by SMcAudio and Patrick told me I probably extended the life of my amp several years by leaving it on 24/7 (I only turned it off when we left for week-long family vacations).  My amp worked fine for 30 years this way with nothing more than a blown fuse along the way that was easily replaced.  Plus, my amp was always warmed up and ready to go immediately, which was nice.  I mentioned to Patrick the reason I left my amp on was from anecdotal evidence that light bulbs almost always blow out when you turn them on, and he thought that was an apt analogy.  SMcAudio believes in this so strongly that when you upgrade the amp they disable the power switch that becomes nothing more than a dummy switch that controls nothing but the power indicator LED (they said so the wife/dummy knows it’s on — heh heh), so as long as the amp is plugged in it is always on.  Given my personal experience and that Steve McCormack kinda knows what he’s doing I just thought I’d share FWIW. 

Further, I’ve never heard of an audio component bursting into flames and causing a fire.  But whatever. 

most new components have soft start circuitry that dramatically reduce the inrush and damage to components. So this shouldn’t be an issue with newer components.

@minorl Even if that’s so, which you’d need to confirm with the manufacturer, the point you’re missing is that the constant temperature fluctuations between cold and warm/hot also degrade electronic components faster — this according to Steve McCormack.  I’d refer you to my prior post for more context if you haven’t read it already.

@minorl I think I kinda misspoke — I meant that every time you turn your system on the temp of the internal electronic components go from cool to warm/hot, and then when you turn it off the reverse happens.  This is the temperature fluctuation I was referring to, not some constant fluctuation during operation.  Just wanted to clear that up and sorry for the confusion.