Recent content by blackmountainamps

Sorry Sorry I thought I had replied yesterday but I now realized I replied to the "noreply" email address that sends the notifications... :) Anyway...here's what I wrote: Yes, it's a pain to check that cable. If you ask mesa I believe they will send you the schematics. However, try doing this...

I serviced two of these amps this year with the exact same issue but different causes. One of them was on my bench yesterday. The problem you are describing sounds more like a bad 7-pin footswitch cable which was the case of one of the amps I worked on. Try measuring continuity from on end to...