I bought one on Ebay about a year and a half ago for $180. The meter was all busted up and it was sold as untested. I was quickly able to surmise that some of the connectors to the cards had gone bad, so I hard wired them directly to the card. Also, this one had been in use at the University of Indiana and someone had scratched a "T" in front of Ampex thereby leaving it a "TAmpex".
But then, 6 or 8 weeks later I bought the correct Simpson meter on Ebay for $20. Now I have a great sounding, cool pre. All I need now is another one.