Crumar Performer

I have a dead Crumar Performer. I was working, then cut out (no sound) and although it is powered up, I hear nothing. I gave it to a repair guy but no success. Any thoughts??

Sorry, there are just too many possibilities there to suggest any particular direction. Checking the voltages that the power supply is putting out is always a good first step. If those voltages are correct, then it’s time to do some serious signal tracing, and for that, you’d need a tech with an oscilloscope and the schematics.