CAUTION ago PROPHET VS and Prophet VS. As Moog or Oberheim, there were several fabrications. (Source doc SCI and Wine Country)
This is some of the models "keyboards" that are touchs, some do not have that amricaines parts SCI (same problem as for Xpanders), thus some are much less hot, more approximate, and less reliable in the time.
The models are CHOOSING to focus on and those whose last four digits of N series are between 1299 and 1499 (and the 2499 series was even worse in 2999 when the First). It seems that over the surrounding 3000 only 2 sries fabriqus these are truly the best (those staying much longer reliable components, these series are only very rarely victims of the classic syndrome of "loss of voice")
The revision has privilgier in cllavier version is also 1.1