I bought a new Ampeg Heritage SVT-CL about a year ago. It always had a little bit of noise, and at first I found it annoying but acceptable, but it kept increasing over time. It sounded like static, and it would come through both the cab and the balanced out. So, I called Ampeg to get warranty work done on it. They sent me to a local repair shop in the Dallas/Fort Worth area. The bad news is, I dropped it off December 3rd, 2012, and I didn't get it back until February 2013. The good news is, they fixed the problem (although there are some issues that I discovered once I got it home, more below). Part of that fix was replacing the power tubes, which Ampeg paid for well outside the 90 day warranty for said tubes. Hooray! The only problem is, the repair shop used Sovtek tubes (Winged C tubes were in there prior to the repair). I called Ampeg, and told them that I was a little upset that I had not been told they were giving me lesser tubes (IMO). They shipped me out a full set of 6 JJ power tubes, no cost to me! While there are a couple of other issues specific to the shop I have to address (they put the head back together sloppily), I have to give Ampeg full marks, they really handled this the right way, even when some of the issues were caused by the shop and not them. So, three cheers for Ampeg!