Yesterday I picked this up at a tube-maniac shop in Tokyo, totally handmade, hand-wound transformers, 1940 US miltary tubes, 24/192 dac, coax/opt/usb/analogue inputs; highgain/lowgain outs. Totally silent. Super powerful. The HD800s are finally at home . . .
Now really keen to try a kit, probably Bottlehead - may just jump in and build the balanced Mainline !