much more common NC-300 with an eye to doing the K0EOO mods described in ER about 100 years ago.
I put the ER mods in an NC-300, and the results, while better than the stock radio, were not all that great.
The NC-303 SSB receive is much better out of the box, and after I got one, the NC-300 was passed on to someone else. The '303 is a pretty nice radio overall, although it suffers like the NC-300 from SWBC image problems wreaking havoc on 20M especially (at least in my location). The little trap circuit in the front end that's there to mitigate the problem is relatively ineffective. Still, I like the radio a lot, mostly because of that beautiful dial :-)
Grant/NQ5T