bchiodini

Dave, Replacing the main board fixed the problem for me. It was purchased from fullcompass.com. $92 US. Troubleshooting revealed, no 5 volts on the input board. The 5 volts is sourced on the main board, but I couldn't find an accurate schematic to trace the problem any further. I suspect a bad resistor between the 5 volt regulator and the input board. Bob...

Dave, I have the same problem with an identical amp. It doesn't seem to matter what I put in the 1/4" jack. I tried a plastic rod and the amp squeals. The rod does not need to contact anything inside the jack, simply be inserted a short distance. Have you found a solution, before I open it up?