Jla,there are some tube amps I would worry about leaving on while I was away from home. Yours is not one of them. I won't mention any brand names, but some of them are fire hazard(poorly designed)! I would hate to come home to find that my brand X amp had burned my whole house down after it spewed sparks and flames ,in a sort of, mini, Mount St.Helens catastpophic melt down. I have seen power supply failures that burned holes through circuit boards.
Not another "Should I leave my amp on question???"
Warning....could be the dumb question of the week.....I own an Audio Research VT-50 (tube) amplifier and I would like to know if I should power the amp down when I am going to leave the house for a short period of time (lets say 1-2 hours) with the anticipation of listening to music when I arrive back home.