Essentially we are allowing a $500 credit for the old wired and working chassis when we install a new mother board in your existing 17" wide AVA preamplifier. This is because the new mother boards are pretty much a drop in fit and reuse the existing controls, jacks, power transformer, and most of the existing wiring.
If you want to sell your existing older AVA preamp or have us broker it, obviously the newer models will bring more than $500 on the used market. In general, current generation products will bring about 60 percent of new price. Remember that used buyers are buying used equipment because they don't want to pay anything near new price. Remember too that the market for great used audio equipment is depressed now due to the long running recession. Not our fault!
Note that we can't install silver faceplates on units over a couple of years old. It took revisions to the inner sheet metal on the chassis to accommodate the new switch, LED, hidden fastener hardware, and headphone jack locations.
Frank Van Alstine