Check out my eBay auction of some 300 watt push pull transformers with cathode windings.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=290184165914&ssPageName=STRK:MESE:IT&ih=019
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&rd=1&item=290184165914&ssPageName=STRK:MESE:IT&ih=019