Cathode inp Z should be in the 100 - 150 ohm region but if anyone has a more exact figure I would like to know. 73 Jim SM2EKM jeh@on.mobile.telia.se -- 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