I had one of those sets in the late 60's. Somebody had traded it in at the TV store, where I worked at part time. I think I paid the boss $75.00 for it. The chassis was very similar to an RCA set of the era, and it used a 15" picture tube with the same large round socket as popular 21" American TV's. It was quite deep, so it was probably a 70 degree deflection angle tube. The thing made a great picture. The smaller tube probably had a lot to do with that, since it reduced convergence error, which was still a big deal in 1968. My parents had a huge RCA color console in the living troom, and this set ran rings around it picture wise.

The downside was it was incredibly ugly. It was just a big black metal box with a small picture. None the less, it was the start of Japan's entry into the US TV market, which did a lot to improve over all color TV quality.