Hi all, I have a Dr Z Maz Jr Reverb combo. Love it. Until tonight. I as playing and decided the volume needed to go UP. So, I cranked the volume knob on my guitar. Volume increased. Momentarily and then decreased by like 90% permanently. Now I can still hear it working but the output is way down. Any advice on where to start (tomorrow when I am off the scotch)? Thanks for any help.