Svetlana literature says their 572B is a plug-in replacement for the 811A, anyone try it in a Centaur yet? 73 Jay W7CW 1AB Ranch Gillette, Wyoming -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm