Vlad urged that users leave it on all the time -- though I don’t like running tube gear when I’m not home (and I used to pull power during electrical storms). That thing did not sound right for a long time from a cold start.
@whart - It's weird. I wish we had some way of determining exactly what components caused this. For my class-D amps for instance, if we knew it was just the input section, or a particular set of transistors maybe those could be kept warm, leaving everything else off, but at 7W idle it wasn't a huge deal then.