What's a fair price for an Audio Research Reference 75?


The Ref 75 doesen't seem to come up for sale very often. I don't know if it's because they are rare, or owners are just hanging on to them, so I'm wondering what would be a fair price to a buyer?
audiojerry
Post removed 
yes - upgrade can be done to run kt150 - contact greg christensen via email to the audio research customer service webmail address - he can give you up to date costs