Very Hard to get extremely well respected Japanese Head Phone Amplifier.
In conclusion, the HA-02 mirrors transistors in how linear it sounds and how detailed against a very low noise floor. But it's triode through and through in its staging, layering, coloring and microdynamics. Considering how intimate an experience headphone listening is, you really do want the very best this close to your ears. For the 40-ohm ATH W1000 "affordable luxury" 'phones, the Yamamoto is a match made in the Japanese heavens. Christmas indeed.