When figuring the tank Z in an output pi network is it figued using the expected plate voltage under load or at idle? It makes quite a difference. Lane Ku7i -- FAQ on WWW: http://www.contesting.com/ampsfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com Search: http://www.contesting.com/km9p/search.htm