Looking at an Ultra on CL< priced cheap...listed as a 1517D Ultra Deluxe, but the Ovation model listing says a Deluxe was simply 1517, while the later not-a-Deluxe was designated 1517D. Anyone able to enlighten me as to the differences? The Deluxe lists a V preamp while the non- has no specification?

I played one of these a few years back in a pawn shop and was impressed, but not enough to pay anywhere close to retail.