These hardly ever come up for sale. I am very impressed with this amplifier. It is extremely quiet, dynamic, and clean. It is very well suited to tube rolling. There is a thread dedicated to it here. I encourage you to read about the design and all of its well-deserved praise. It natively takes a 12AX7 / ECC83 preamp tube and 6AS7G power tube. I'm including an adapter made by our own @Deyan that allows 6SN7 / ECC33 tubes to be used instead of 12AX7. The amp has two sets of input jacks on the back but I removed the selector switch to improve the fidelity of the signal path. So only input 2 is active. You can certainly put in another switch if you wish to have two inputs. The volume control is smooth and the two output jacks are solid. I replaced the gold faceplate screws with black hex screws for a more sophisticated look. Included are two NOS RCA 6AS7G tubes and two NOS Tung-Sol 6SN7GTB tubes in addition to the adapter. You WILL enjoy this amp, I give you my word. And at this price, it's a no-brainer. I just don't use it anymore now that I have my Glenn OTL and I'd rather someone else enjoy it.