I just had a brief chat with Shikata San on facebook. He had posted there that the new hybrid amp will be more suitible for harder to drive headphones and that the TU-05 runs single tube thus less power.
I asked him what he meant by single tube and his response made me really happy!
It turns out our amp runs in Single Ended Triode mode!
So fellow owners of the '05 I think we own, from what little research I have found thus far, something very rare if not unique, a battery powered SET amp!
That explains the effortlessness and sweetness of this amp!
Edited by ianmedium - 3/5/13 at 11:25am