Simon Steed wrote:
> Hi all,
>
> I'm a UK ham who is limited to 400W & would like to build my own
> linear, one as I've always wanted to play with valves and two because
> I want to learn more from the experience.
>
> Now googlising has brought up many designs + I also have a few old
> magazine articles for similar. A couple that have caught my eye are:
>
> 1/One published in the UK mag Ham Radio Today & was designed by
> G4JST. It uses three 4CX250B's with a HT of 1.3kv to produce 400W
> which is apparently very linear output. I know the HT is low compared
> to what it should be so I'm prepared to uprate it accordingly if this
> is feasible. I can scan the article in if any of the more experiences
> users would like to see it's design? There are some holes in the
> article though so it may not be 100% suitable for my 1st project - I
> quite like it though :)
I've always admired that one too - although the live chassis version is not
for the faint hearted! Leave the ht low on '250s, run them at 150-200W out
and the problems and vices go away. It's not as if you need every last drop
of gain!
Steve
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