I know this is an old thread, but I think the explanation of the difference between U and non U models would be beneficial also to the rest of the JVC VCR range,
Seems like the U model is an updated version. Has more buttons on it and an extra green lit button for S-VHS ET, also some extra buttons around the screen which 7600 doesn't have. the 7600U claims to have SVHS enhanced technology, whatever that is and dynamic drum. While the HR S7600 just says DigiPure and that's it.
The obvious difference is that the 7600U is black and 7600 is silver, but I doubt they are exactly the same, what would be the point?