Recent content by mikeskory

I have a Mesa-Boogie Express 550 on my bench at work. I know it's a problem with the mute circuit but not sure how to pin point the failed component(s). No voltage at the J175M, J175RSM or the J175RFS gates.

I'm sorry to butt in. What email did you use for tech advise? I need some theory on an Express 5:25. Working on a customer's amp. Thank you, Mike