Here's an idea for a cheap screen supply.
Start with the plate supply from a very old Motorola or GE VHF/UHF base
station.
They usually generate about 600V, 200W CCS. Pull out the 5R4's and replace
with solid state rectifiers. Then install 6L6, 6880, EL34 class tubes as a
series
regulator into the 5R4 sockets and figure out a series regulator circuit
from an
old handbook. This approach saves a _lot_ of work. If you feel a bit more
modern, use a high voltage hexfet or equivelent for the series regulator. I
did
this for a 4-1000 screen supply and it worked well.
jeff
----- Original Message -----
From: "Lane Zeitler" <Ku7i@worldnet.att.net>
To: <amps@contesting.com>; <boatanchors@listserv.tempe.gov>;
<boatanchors@qth.net>
Sent: Friday, October 06, 2000 7:49 PM
Subject: [AMPS] amp project: 4-400s X 4
>
> Gents,
> The new amp project is four 4-400s in parallel. I would like to talk with
> current or past builders of 4-400 rf decks for any advice. I pretty much
> have all of the data I need btwn the West Coast Handbook, AG6K's site, old
> magazine articles, and previous amp projects. The biggest hurdle is what
to
> use as a regulated screen voltage source. Many options here. The deck will
> cover 160 to 10 unless the combined Cout of all of the tubes in parallel
> makes it too hard to get to load on 10/12, etc.
>
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