In my posting, my fingers got ahead of my eyes. No, there isn't a new tube called a tride. It's a TRIODE. Oops. John K5PRO -- 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