I know you guys are going to answer somethin' like : it's normal, you can use it as an overdrive... but wait 'till the end of this message. I just got (2 weeks ago) a used SABDDI and I find it usefull and it sounds great. The problem is it overdrives easylly (is that the right way to write easy-lee??) even when the drive knob is at 6 o'clock. As soon as I am playing with a little dynamic, it overdrives. Is it normal? I never had a tube amp and I'm wondering if this is the way tube amps sounds?? So, is it normal or is it broken?