Line output, 75/600 ohm, 1:3 turns ratio, like the API 2503 used in
their 312 and 325 amp cards.

Pair:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2554818928

Single:
http://cgi.ebay.com/ws/eBayISAPI.dll...tem=2554820889

Now go get 'em!