Are some years of NAD 2200 better than others?

I've noticed some sell on Ebay for considerably more than others.

fivefasts03-12-2009 7:15pm

bongofury Details Discussions Posts This discussion Message User 1,160 posts 03-12-2009 at 10:14pm Copy Comment URL Report Comment Edit Delete The basic watt per channel and noise cancellation improved through the years, peaking around 1987 to 89.
shsu Details Discussions Posts This discussion Message User 19 posts 03-22-2009 at 05:43pm Copy Comment URL Report Comment Edit Delete i think there was a X version and a non X version i had the 2100 which had these two versions, only on the label and on the box but not imprinted in the unit