Advice on pricing old Audio Research pieces

Last week a SP6A pre sold for $611 on epray. The Power amp is probably less valuable as it is SS. I paid $350 for a d100b a couple of year ago, yes it still works, if it were tube there is a collectors market but old solid state ARC never gets a ton of money, not like Mac or Krell. You can either do a lot of work or buy a blue book. How's that for a direct answer!!

BLue book doesn't really reflect current market sales. EBAY has changed that dramtically. Condition is everything in vintage audio. Demand for any audio piece is an elusive concept. Factor in the blue book, ebay , audiogon and you'll get an idea for a asking price. Ultimately you accept a a price from a buyer you can live with- Good luck. Be patient

even if you dont use it alot, it is worth it when you do use it, the BB is how this site gets funded so we should support it

Thanks everyone for the input- I'm fairly new at this and this is quite helpful.

BB may work for some people here, but I am with Lolo on this one - there's plenty to learn from what happens on A'gon alone .... and then ebay would be a worthy secondary choice. It all comes down to the condition and the time of year and this simply can not be reflected by prices in a book.