I've got a Mesa 400+ head that I recently had all the power tubes replaced and biased in, but I'm still having some issues. The head will just cut out and not give me the volume I need! I usually run the pre-amp volume at about 9 and the master at like 2 1/2. The last show I played it just went quiet, no blown fuses though. I remedied my problem by switching both volumes to 6 (master and preamp.) anyone have any idea what is going on? I think it might be preamp tubes. Any thoughts y'all?
Did you do the tube replacement, or did you have it done by an amp tech. If you did it, take it in to see a real amp tech. If your tech did it, find another, more qualified amp tech.
And also try patching a guitar cord between your Effects send and return jacks - (If this helps your problem, the switching contacts in your return-jack probably just need to be cleaned/serviced)
