does your system "warm up" and then sound better?

You can do this with SS components which have insignificant idle draw- when leaving them on all the time. They generally do sound better than cold components
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You can't do this with with tube gear because even the lower current on the tubes will still age the tubes and you'll burn thru them at an unacceptable rate. I have good NOS preamp tubes in my amps which I hope to preserve for as long as I can, so I never like to see my amps on when not in use. I have mistakenly gotten distracted and found them on much to my chagrin.

The Answer is no for tubes Yes for SS.

Anyone who said warm tubes would sound better is correct. They sound much better than cold tubes. I was thinking of the leaving them on all the time part of the question,