Gentlemen, is there a tendency for the grid current to fall off after the tube has been on for an extended length of time in the 3CX800A7???????? Larry AA7LR -- 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