Quite a stash to find after all these years!!! As for the NS chips, I have that in my Composer, and it works great. If it's set up correctly with a good stable input signal from a high end cartridge, it's almost impossible to tell the difference from the Exars. But. My understanding, which may not be correct after all these years, was that the NS chips had a flaw in the manufacture, meaning that before the units would work correctly, the factory had to do some workarounds. I thought I heard that you couldn't swap the chips across one for the other because of that. If you unit shipped with an NS it had to stay an NS and same for Exar, although after all this time, I may be wrong.