This is a rare DIY T2. You can only get them custom built. This one was built by Kerry of New York City and is his version 2. He is one of the best builders. There is no commercially available Stax or other make headphone amp that comes close to a DIY T2. Condition is perfect. The sound is outstanding. The finish of the casework is the best. Price includes 4 Amperex Orange Globe 6DJ8 input tubes and 4 current issue Mullard EL34 output tubes, and shipping box. Units can be stacked one on top of the other, placed side-by-side or on separate shelves. Power supply unit has a transformer that was designed for 120VAC and 240VAC and I had Kerry check that it ran fine on 230 VAC. To change operation to 120 VAC will require the buyer or their technician to adjust the internal wire connectors to the transformer as appropriate. Sale terms: The price is very fair. No bargaining please. Payment by wire transfer only. Unit is located in Hong Kong and buyer pays courier shipping costs. Thanks for looking.