For all you Blues Deluxe owners- have any of you had problems getting the amp to go into overdrive? Mine refuses. I mean I've hit it wide open on the pickups (tele vintage pups wired in series), on the drive channel, with drive on 12 and the master up so loud it hurt... lots of unmusical noise ensued, but no growl or grit. I've seen YouTube videos where this amp distorts so nicely, but mine won't. My tubes are all new. Any helpful suggestions from experience are much appreciated.