At 00:38 AM 10/1/2007, Bill wrote: >Can a 800 test a 6550 and if so does anyone have the settings? You should be able to test it as a KT88 - 6.3 V, JR-5347-2, 18, 92, P4, 7000. Dale H. Cook, Chief Engineer, Centennial Broadcasting, Roanoke/Lynchburg, VA - WZZI / WZZU / WLNI / WLEQ http://members.cox.net/dalehcook/starcity.shtml