I've heard that applying regulated 3-400 volts to the screen of a cathode driven 4-1000 in grounded grid will lower the drive requirements. Any comments? Thanks. Bob -- 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