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Yeah, I first swaped the tubes since it was only happening in one channel but nothing, then changed the entire set for preamp an power amp and the same... I usually do my amp service, but I need a schematic and Mesa told me that they don´t give schematics of current production amps, only when...

Thanks for your reply. The first thing I did was disconnect the footswitch and try only with the toggle switch. Them problem persist without the footswith. It´s only in Channel 2 no matter the mode. .....

Hello, I am new at the board and came here looking for help. I have been a happy owner of a MB Express Plus 5:25 for about 1 year. This week the amp Channel 2 started coming and going intermittently, when I stopped playing I heard a clicking/chattering noise that I assume is from a switching...