Leaving my amplifier on ok?

There is only one rule that apply universally and in all case:

Love God above all...

And the prime numbers distribution law after God ...

Amplifiers differ and human habit too , climate, house grid , etc then there is NO ONE RULE for all and every amplifier and for each one of us..

«Next subject if there is one»-- Groucho Marx 🤓

 Electronic components don't wear out like for example mechanical components. But a mains voltage spike or lightning strike - that'll fry your amp and perhaps other components - nicely. Maybe unplug your system if you're not using it for long periods.

@bishop148 

Electrolytic capacitors and relays definitely have a life expectancy, so there are components in audio equipment that need to be replaced.

Dam! Don't you hate being wrong!

However out here in the boonies, lightning strikes are frequent and without a very fast over voltage protection it can and will damage your gear.

I have left my Class D amps turned on for years.