For those who are unfamiliar with the 4CX600J, there is a picture and some specs at: http://www.SignalONE.com/vactubes/eimac/tubedata/4CX600Jm.JPG de Randy, W7HR <hamradio@emerald.oz.net> -- FAQ on WWW: http://www.contesting.com/ampfaq.html Submissions: amps@contesting.com Administrative requests: amps-REQUEST@contesting.com Problems: owner-amps@contesting.com