[Elecraft] HF amp kits

[Val]

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