The good news is: I got my brand new EZG-50 2x10 combo yesterday. The bad news is: when I start it up - I get a weird, octave-down, synth-like sound underneath the low notes. Then it goes away after a couple minutes. Since it goes away after the amp warms up - could it just be a tube issue? When it finally goes away - the amp sounds absolutely incredible. Everything I was hoping for; very disappointed however about the possibility I might need to send it back for some warranty repair.