Still having issues with my infrasonic filter I have cleaned all switches with deoxit and replaced all 26 of the electrolytic capacitors.
The problem is only on the left side sounds like a popping noise.
when looking at the schematic I see IC #7 op amp 4136 . should I replace it? Mouser has a RC 4136 N will that work or is there a better one.
will I need to use a adapter?