Yes, Nikko had a lot of very listenable gear back in teh 70's.
My choice of receiver that I owned for many years back then was a Hitachi sr804 Class G receiver. IT was a very well made piece. The Class G design enabled more power in a smaller package but the sound quality fared poorly against the absolute top notch Tandberg tr2080 that I acquired concurrently a couple years later. Nikko sound was very neutral as I recall and always sounded good versus the other Japanese competition but the pricier Norwegian made tandberg was a cut above them all.
My choice of receiver that I owned for many years back then was a Hitachi sr804 Class G receiver. IT was a very well made piece. The Class G design enabled more power in a smaller package but the sound quality fared poorly against the absolute top notch Tandberg tr2080 that I acquired concurrently a couple years later. Nikko sound was very neutral as I recall and always sounded good versus the other Japanese competition but the pricier Norwegian made tandberg was a cut above them all.