Yes, shut it off, especially when going away or not listening for over a week. You are just wasting electricity. It only takes about a half hour roughly for most things to fully warm up. Class A may take up to 90 minutes to sound its best.
The only piece of audio equipment that ever came close to starting a fire was a carver receiver I had in the late 1980's, it shot a big flame out the top cover, so I suppose if I would have put a magazine on top of it there might have been a fire.
I had this exact question regarding my First Watt J2. So I called Nelson Pass. He said what turns his amp on earlier in the day if he knows he’s going to listen to it. So that’s what I do.
If Nelson says so, I don’t need no freakin science. 😀
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