I agree with Mrtennis. I have owned lots and lots of tube gear and always turn them off after a listening session. My solid state gear is left on.
Tube DAC Conundrum
I have the Blacknote DAC30 which has 4 tubes in it. I read that digital stuff should be left on for everyday listening, but won't that use up the tube life a lot quicker? I am willing to change the tubes every year if leaving them on all the time will get me that far, but I don't know.