My DAC is tubed and the manufacturer still recommends leaving it on 24/7 and I do, unless I leave town for a week or more.
Pros and cons of leaving your DAC on 24/7
I hate waiting for equipment to warm up. But I don't want to kill a components lifespan by leaving it on, if that's a danger. My Musical Fidelity V90 DAC takes a little while to sound its best. I think most DACs do. I leave it on 24/7. Anyone have a problem doing the same?