I would use a 4c5000/10000 as rich suggested at half plate volts, look
at the price of the 4cx1600, the 4cx10000 is a bargain even new, and
has a "A" type warranty, you can aslo have them rebuilt. Ham type
tubes burn out like light globes, a large tetrode would outlast most
of us in ham service. Besides that you would have a clean signal. Just
check out the splatter from these new amps with EBS circuits,
Besides in winter you can connect this tube to a Bird water load and
feed your Hydronic heater system if you are worried about running high
power.
Igor
---"Phil T. (VE3OZZ)" <phil@vaxxine.com> wrote:
>
>
> Joe, I've always been intrigued by the 3CX5000A7 and 3CX10,000B7 but
Ive
> yet to find a surplus one. These require no socket (bolt directly to
> chassis), and the heaters draw less current than a pair of 3-500Z's.
The
> cathodes are oxide coated, indirectly heated (obviously), so warm up
is
> required.
>
> Don't know anyone that's used one for an amateur amp but there must be
> someone.
>
> Phil T
>
> At 06:26 PM 2/18/99 -0500, you wrote:
>
> >
> >OK ... I looked at my Varian catalog and the 103 Amps was for the "J"
> >version of the 4CX5000/4CX1000. Still, the requirements for filament
> >power, air socket and air flow are a bit stiff for the amateur
builder
> >(and no amateur commercial builder is using the 8171). What do you
> >think ... 9 KW with 7 KV on the anode and drive by a FT-1000 <G>?
> >
> >73,
> > ... Joe Subich, W8IK/4 ex-AD8I
> > <W8IK@IBM.NET>
> >
> >
> >
> >--
> >FAQ on WWW: http://www.contesting.com/ampfaq.html
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> >
> >
> >
>
>
> --
> FAQ on WWW: http://www.contesting.com/ampfaq.html
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>
>
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