leave amps on?

Both my Quad 405-2 and my Bryston 4B sound better when left on all the time, so that's what I do. Bryston specifically states that it is perfectly okay to do this. It is the normal practice in pro audio. I even read a review of the Bryston 4B-ST in which the author thought the amp was grainy and harsh until he forget to turn it off one night. After that he thought it was the best amp for the money that he'd ever heard. In any case, try it out yourself and decide. Hope this helps. Joel.

I once had a pair of Adcom GFA-555s and left them on for over a year...saved me having to warm them up before listening. Took them about 30 minutes to really come up to temperature and sound better. Not essential, though, as long as you fire up the system well in advance of a listening session. Play some pink noise while you're decanting the wine!

I have a aragon 4004 that at first I would turn off after listening. But I found that the amp took a long time to warm up. Now I leave it on and in case I want to show off the system to a neighbor it's ready to go. Unless your amp is class A I would leave it on. Good listening Bret

I leave my amps on 24/7 unless there is an electrical storm, then I unplug 'em. Like Rsuminsby, I have had Adcoms for many years, and it takes about 45min for the sound to noticeably change, but it really takes a day or so before they fully stabilize (the new MOSFET ones take a bit longer). The reason to leave a Solid State amp on is so you don't have to wait for it to warm up, but keeping the amp on also stabilizes the bias. When an amp is first turned on, the bias is high and needs to settle with the ambient temperature. As the amp warms up, the ambient temperature rises, which, in turn, lowers the bias. If you can imagine a scale or a see-saw leveling off, you get the idea. This bias settling takes quite a while, so I find a day is usually good. Once you play music and get the amp hotter, the settling time becomes a bit faster, because the transistors are operating in their quiescent range.