^^^ I also had a Yamaha CA 1000 back in the day. It had a switch where you could run it in class A. The only difference I noticed was it ran a lot hotter in Class A with no difference in SQ in either mode. It was a nice sounding unit for sure.
Its not Japanese, but these were some really good sounding receivers in the day ...
https://www.ebay.com/itm/TANDBERG-TR-2045-FM-STEREO-RECEIVER-SOUNDS-INCREDIBLE/183917204224?hash=item2ad251d300:g:vlEAAOSwvdxdUGMl
Its not Japanese, but these were some really good sounding receivers in the day ...
https://www.ebay.com/itm/TANDBERG-TR-2045-FM-STEREO-RECEIVER-SOUNDS-INCREDIBLE/183917204224?hash=item2ad251d300:g:vlEAAOSwvdxdUGMl