Leave it on?

@invalid 

As l said, oil is okay with no other choices. 
 

Your last question to me in unanswerable.

I never turn off my accuphase integrated or my aurender streamer, as recommended by the manufacturer. The only piece I turn off is my Manley tube preamp to preserve the rather expensive tubes. I leave my simaudio amp in stand by all the time. I’ve been told the constant cycling is bad for the power switch and the capacitors. I’ve never had any problems with my equipment. 

Me leaving my amp on 24/7 (which I do) will not destroy the planet any more than turning it off will save it. 

@mitch2 ,

Do you hear any appreciable difference with your thermal magnetic switches in?

I have Yamaha MX-1 (>30 years old). Everyday, I turn it on and off.

No problem so far.

I just like to listen to music, not observe best condition of audio equipments.

Some vinyl LPs give music + scratch noise, but I only focus on the music itself.

True music lovers do not care about best listening condition, such as immediate warm sound from all-day-long turned-on audio system.

Please, just listen to music using your current system. Refrain any upgrade or any method to make sound better.