What about "cascode" schematics?
I remember, back in dormitory times, making one for my homebrewed radio.
It needed about 100mW to produce 80-100W output, depends on band.
On Tue, Oct 12, 2010 at 3:12 PM, Robert Morris <robrk@nidhog.net> wrote:
> On 10/12/10 2:15 PM, johne tds.net wrote:
> > I was in qso with a another ham about a tube type amp that could be
> > used with our Yaesu FT-817 's.
> >
> Go look for grid driven, class AB1 amp designs. Any number of tubes from
> 2E26, 6146, 4X250, 4-400, 4-1000, on and on will take your 5 watts and
> make 30 or 3000 watts.
>
> The added complexity is the need for screen and bias power supplies.
>
> There were a few amps made in the 50's, Heath, E.F. Johnson, Central,
> good luck finding any.
>
> Many of last of the big iron transmitters of the day, Viking Valiant,
> Viking 500, Heath Apache had an input circuit to drive the PA stage from
> an outboard 5 watt SSB generator.
>
> http://www.heathkit-museum.com/ham/hvmkl-1.shtml
>
>
>
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