Contacted Mesa about a low distorted output signal. Rich said it sounded like the MOSFETS. Got 10 Exicon MOSFETS from Profusion of England. Installed new MOSFETS and have exact low distorted output as before. Anyone have any ideas were to go next with it? I am working on it myself, so I already know I could have sent to an expert, but not able to do that at this point. If I was able to desolder and solder 10-3 leg MOSFETS, and still have a signal, I can possibly finish this. Any help will be greatly appreciated.