I leave SS gear on all the time unless I'm going out of town for a few days. I usually listen every day, so it makes sense to leave it on. When I've had tubes, I would only leave them on when I was home. On a few occasions I left the tube gear on overnight, and I thought it sounded better the next day. But that was probably a placebo effect. Generally, I don't like to waste tube life, so I only power it up an hour or so before playing.
Does anyone leave their amp and preamp on all the time?
I listen most nights after work. I find that the system takes a while to warm up and sounds it's best if it has been shut off. So I leave it on. I always have and this is vintage stuff. The amp is a 25/25 Bedini class A. It stays warm but never hot. It has never caused an issue but recently I've been speaking with others that were stunned that I would do this. So let me know if I'm the only one that lets it run. Do you shut off the equipment after each session?