Emma,
     According to the familysearch catalog (I just searched "Nograd" to find this); there are feudal taxation records for Nograd megye.  According to the list of results, films #1729913, 1729934 and 1729935 contain Jewish records, though the description for each film does not specifically indicate this.
     You should look at all these films, though it may be quite a slog.  They are all digitized, but not indexed/transcribed, so you will have to go through them image by image, which is a huge chore, but be patient and do it.  Just a guess--the Jewish records may be grouped together at the end of the film....??
     I found similar records for Vas megye, and I was able to use them to trace my SCHREINER and LICHT families from Körmend back to 1793.  There were tax census records for 1821/22, 1813, 1808, 1795 and 1793.  The 1848 census was there, but only for Szombathely, not for the entire county.  You may also, if you have a keen eye and can decipher a little bit of Hungarian, find handwritten notes (not entries on a form) about various individuals. 
     Best of luck!!

                  Judy Petersen