Sony's legendary reverb unit, the MUR201. It was a must-have in professional studios back then. I've confirmed it's working without any noticeable crackling. I think it produces a crystal-clear, hard-edged sound that you won't find in plugins. This is old equipment, and the condition is based on my personal assessment, so please understand this before considering a purchase. Everything in the photos is included. No claims, no returns, please.