This is the standard Auditorium 23 Step Up transformer matched for cartridges such as Denon and EMT (and many others) This is approximately 6 years old (I'm original owner) used in a Shindo / Auditorium system. It worked fantastically with my Denon 301 and EMT 15 cartridges - fleshing out the sound tremendously. It really does make a big difference. I recently upgraded to the Auditorium Hommage model, thus my reason for sale. It's in perfect condition. This sale is for the step up transformer only - please see other listing if interested in matching Auditorium cable.