Kicker ZX 750.1 missing cap preamp board

I have an old school kicker ZX 750.1 amp that is not passing audio. I’ve been taking a hard look at the preamp board and there is a missing SMD capacitor C79 that goes across pins 1 and 3 of an A393F op amp.

I was wondering if anyone knew what belongs there or a safe value to use there to see if this is what is causing the amp to not pass audio. Also, feeding in a strong signal will cause the amp to cycle in and out of protection.

I have the area of interest circled in the attached photo.




  • 2B014BA8-AA29-4735-8B3D-715549C657D9.jpeg
    546.8 KB · Views: 36