Hi,
I listed my Heathkit EC-1 analog computer on ebay yesterday:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=4193&item=5157588639&rd=1&ssPageName=WDVW
The machine is quite clean and seems to be in working order. I don't know how it works so I am selling it As-Is. Still it's a good...