So last month I came across and purchased a used 1998 Ampeg Heritage B15R. I believe that this was the first year that this model was produced and according to the serial number it's #21 of 50 that were made that year? The amp is in very good condition, sounds great, and has the original tubes which still have plenty of life left in them. I see that they have introduced some other similar Heritage models, but apparently they made some changes to cut costs for the units. Does anyone if this is or will be considered collectible? Thanks in advance!