The digital amp is quite good, but it's not a contest.... It's a triumph of tube-amp, no any doubt! Tube-sound is natural, airy and bright with depth of the space... But it's all right! Congrat my friend, you're well done! Greets from Hungary! :)))
Thank you for your comment from Hungary. Vacuum tubes are an outdated device in Japan. However, Japan is a country with a traditional culture, so some people find value in old cities and old pottery. Which is better: digital amplifier or vacuum tube? Which one is inferior? I have no interest in such a simple comparison.