Neve BA618 Replacement PCB

Some Neve channel amplifiers contained a daughterboard which switched between MIC and LINE inputs using optoisolators. Decades later, these photoreceptors are starting to wear out and replacement can be problematic. Granted, Coral Sound asked us to draw a PCB which would replace the optos with a brand new relay instead. This is not only more reliable but also lowers noise, distortion, and crosstalk.