Looking for the Yamamoto HA-02
Had to look up the amp, first time I've ever heard of it. The specs look good and it seem it was made for headphones with wood cups like the ATH-W1000 and RS series Grado. If you already have this amp then you might be the only one that I know of who has one so I don't think there are too many out there that can tell you how it would pair with the TH-X00 or almost any other headphone since its not a very common amp. Sure does look nice, like a good match for a TH-900 IMO.