I bought a %13 JRT combo about a month ago. I absolutely love the amp, all of the hype is for real. Gigged with it a few times, band practice, home use, great for all of them. On the downside it has a horrible tube rattle. It's bad enough that you can hear it when it's mic'd through a PA or recording. I noticed it in the store but the sales guy assured me it was one of the other amps ( they have literally 40 or so amps all stacked on or near each other) it seemed plausible at the time. I have tried all the usual things to fix it, changing tubes, tube guides etc... no luck. It does go away when plugged into a different cabinet. I spoke with the dealer and they are happy to try to fix it They are a three hour drive away which is no fun, so I'll have to ship it or make the 6 hour trip twice. I am pretty sure I can't get a refund, and would rather keep the amp anyway, but dropping that much money for something that is flawed is not sitting well with me.( There is a couple of small issues with the cabinet itself, I wonder if it was dropped in shipping, can't believe it would go out the door that way) So my question is.... anyone managed to fix tube rattle, or is it one of those things that never goes away, once it starts ?