There's a "Pulsearc 10/100 tig" currently listed on eBay. It appears to be a unit that cost a lot of dollars when it was new. The photos of this complex unit can be seen at:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=11774&item=3830249829&rd=1

I'm just curious as to what kind of specialized GTAW welding this unit was designed for?

LarryL