Alas, mine hums--and it's starting to drive me a bit crazy, which is why I have mine for sale at A'gon (mine's the one with phono listed at $1190, but I'm certainly open to offers).
A couple of things: aside from the hum, which varies in volume from barely noticeable to noticeable from a couple of feet away (with no rhyme or reason as to when or why), the Unico is a great sounding unit, even with the stock tubes. That's why I'm so frustrated by this. In a perfect world, I'd keep it and save up for the upgrades, which are supposed to be excellent.
By the way, when I inquired, the manufacturer said that the hum is "normal" and is caused by differences between the power grids here and in Italy, and particularly by the power coming into my home. Interestingly, my Unico does NOT hum over at my friend's house (he lives around a mile away), so I guess it is something here in the house.
Feel free to PM me with any other questions or if you're interested in discussing a sale.
Thanks,
Jon