That’s good! I do get numbers of engineers with those JM compressors worried about level differences and it’s often a wiring or connector problem. I’m glad yours is OK again. That’s quite a rare piece you have; the very early ones had no output gain control, then I added a control on the back as a temporary measure while we redesigned the fronts to take the new layout. There were probably only about 10 units made like yours. 
