I have been searching for info on this amp for a while now. The amp I keep seeing is just like the one in the ampguts link. It says "High performance amplification" on the black label. My amp looks pretty much the same except it says "High definition amplification" on a blue label. Also, the bass, treble, and gain knobs are arranged differently. I have a push-button filter on my amp also. I guess they could be different year models.??? I have tried to E-mail ZED a couple of times with no replies. I will keep trying. I thank you for the replies and I will post some pics here and on ampguts when I get a new camera, since it decided to take a swim one day.