IC SSM2166 - SBE Reissue
Analog Devices compressor-on-a-chip. The through-hole part went out-of-production many years ago, so this is the SOIC version bonded to a 14-pin DIP header. Repair your old rack units and build old-favorite designs! Jack Orman offers a PCB and build notes for his Q&D Compressor that is based on this chip.