.....................FREE SHIPPING UNTIL, WELL FOREVER..........Simply put, this is a buffer amp, made for the same use, as say, the Musical Fidelity X10D. The difference would be that this model uses a 5670 twin triode tube, instead of the dual triode 6922 tubes that the Musical Fidelity buffer uses. The idea of a tubed buffer stage is to put tube sound into an audio system at a reasonable price. It can be put between say, your pre-amp and power amp, or between your source and pre-amp. Notice that I added a tube protector that can be removed when the unit is in use. And in the rear of the unit, I replaced the captured AC cord with an IEC power inlet. Nothing more needed to be done to the unit. Looking inside, and seeing the wiring, I couldn't have done better. This craftsman does excellent and clean work. Having said that, the power supply for this unit is an Edcor power transformer instead of a 500 milli-watt 'wall wart'. IME, this buffer is more truthful, meaning, I do not find the usual coloration as compared to many tube buffers. As always, I will carefully pack the unit for trouble free shipping within the lower 48 states. I am only selling to help fund a new project.