I am selling a Rupert Neve Designs API 500 series diode bridge compressor, the 535. I purchased it new from Rock on Store several years ago. It's a beautiful item, with only a few hours of rack time. From a pet-free and smoke-free environment. *Condition is based on my personal assessment, and there may be minor scratches not visible in the photos. Please consider this a used item and understand that before purchasing. *I will periodically review the price, so please refrain from price negotiations.