Yes that's true, "Circulating current in a KW PA is significant." But fortunately the output side of the L-Pi-L shares a good portion of it with the load. 73, Roy K6XK -- FAQ on WWW: http://www.contesting.com/FAQ/tentec Submissions: tentec@contesting.com Administrative requests: tentec-REQUEST@contesting.com Problems: owner-tentec@contesting.com