Hi Chris, With barefoot K2 you don't need two stages to get 600-800 watts out. For instance 4CX800 is happy grid driven with 10 watts. Unfortunately most HB PA articles now are in Russian. However I could help with the translation, if needed. Having only smaller tubes in my junk box, I am working now on a grid driven 4xEL509, delivering 400-500 watts. PA0FRI have a great web site for the amp home brewers. See http://www.xs4all.nl/~pa0fri/Lineairs/Lineairs.htm
73, Val LZ1VB > The Linear Amp kits seem to need a fair amount of drive. I've been > idly thinking about a linear that would allow me to drive it with > my barefoot K2 and get 600-800 watts out for CW. > > I've been told that such things were "common" in the 70s. One description > I was given is > > two stages, with a pair of 6CL6 pentodes in class A passive grids, > driving a pair of surplus 4CX250Bs in AB1,a very common design. > 0.1W in gives 650W out. > > which sort of means something to me, but will certainly start many > evenings of study. > > If this was "common", it seems that there should be articles. I haven't > had much luck finding one (there's an article from 1959 that uses > a single 4CX250B). So, how about it, you guys who were there then? :-) > > 73 de chris K6DBG _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
