Ten slots of 500-series in a Rupert Neve rack, with a power supply built to feed real modules with consistent power. The R10 is the serious rack for 500 units. It is listed empty. The two 1073LB preamps and the 1073LBEQ that have been mounted in it are for sale on their own, so you can buy the rack, the modules, or the whole front end. Smoke-free studio. Everything functional - bought it brand new a few years ago.