Recently one of my clients had an old AudioNote system that wants me to test. AudioNote Japan founder - Kondo passed away during Las Vegas CES show. I still remember I was just passed by THE SHOW area and saw an ambulance arrived.
The Kondo system includes AudioNote M6 Preamp, DAC4 Signature, Neiro 2A3 Power Amplifier.
It represents the glory of tube amplifier design and the musical coloration is hardly to reproduce in any other system. Highly respectful design.