I don't speak Japanese, so I can only guess at some translations. There was an Audio Note company founded in Japan by a designer named Kondo. He put out a highly praised, very expensive tube amp called the Ongaku, which means "music" in Japanese.
Some time later, another company was formed in the U.K., called Audio Note U.K. The Japanese company became known as Kondo Audio Note Japan. This Japanese company put out a line of hifi products including the Kondo Gaku-oh (note spelling -- not "Gaku-oN") tube monobloc amp, also favorably reviewed and very expensive.
I could not find any Gaku-on. You might consider Googling the other names. I came up with a comment by reviewer Robert E. Greene ("REG") from TAS in May 1992, excerpted at the web page below:
http://www.regonaudio.com/ongaku.html
As you can see from reading it, he doesn't like it all that much and seems to think its qualities have been overstated by other reviewers. After reading his comment, I conjecture that it may have been a sidebar to a more positive full review by someone else, which would imply that such a full review might have been published in the same issue or alternatively, perhaps earlier in the few preceding issues of TAS. I haven't done that search. Good luck.