Just to add guys, this has been the best preamp I have owned and that was comparing it to the Pass Labs XP10, XP20, Ayre K5xeMP, Modwright, Dodd audio etc. The only reason I am selling is because I purchased an Aesthetix Janus which is a calypso with a phono stage built in. If you have been thinking about wanting to find out what tubes are capable of this is the preamp to tell you. I had tried tubes before and was not impressed, this preamp changed my view on them. It truly is an amazing sounding pre. Thanks