Stumbled upon a close-out demo of the SD TT Classic. $129. OK I know, so I got it home plugged it in, and there is so much noise from this pedal that it is unusable. Could there be a fix? Anyone else who has one experience these kind of probs? The adapter they gave me says 16V 600mA output. Maybe the tube is bad? Any suggestions before I take it back. I really wanted to like this pedal, but I think I'm gonna buy a BUEQ also. Thanks in advance.