Lindell Audio 77X-500 500 Series Stereo FET CompressorOutfit and enhance your 500 Series rack with the Lindell Audio 77X 500, a stereo FET based compressor that's ideal for use on stereo buses, stems, submixes, and instrument sources such as drum overheads and double miked electric guitars. With four OPA1731 opamps and transformer balanced outputs, the 77X 500 delivers 1176 style compression in linked and unlinked modes. It even offers the classic All Buttons In 100: 1 ratio as well as 4: 1 and 12: 1