opinions

I'm just curious as to why the vintage gear? I've done some experimenting with vintage pieces myself, and the only type of components I thought worth buying were tube amps. Didn't care for anything solid state or even tube preamps. To be fair, I haven't heard the NAD in a very long time, and never heard the Sansui, but I don't see why they would very different than similar products I did listen to.

The Sansui AU series is highly regarded for its sonics and build quality. They are not completely neutral sounding, more pleasant sounding than explicit, but they do provide long-term musical satisfaction when matched with sympathetic loudspeakers. I use an AU-999 with EPI 202s and I suspect your ARs will be a good match. I've never used the phono input so I can't comment.

I owned the Sansui AU-555 back 70’s and agree with Tls49 and Onhwy61. That said, I would buy something much newer as suggested in your other thread. Never mind my question concerning the AR2s there. Enjoy!