This is an SVT-4 pro in excellent condition. I purchased this a little over a year ago for a gigging rig that I was expecting to use but the band project died out and I never was able to gig with it. All knobs and sliders work fine. Also, when you first power on the amp it makes a pop sound, but the amp has and still does work perfectly. I even had an electronic tech check it out but could not find the source of the pop. The previous owner replaced the tubes (JJ’s) just prior to selling the amp to me and they probably do not have more than an hour play time on them. Comes with power cable and mono cable. 475.00 shipped conus!