[Amps] 4-1000A Input matching

[Bob Maser]

He told you that it is running in grounded grid.  At 6000VDC on the tube he 
is going to need at least 250W of drive in order to make it "come to life". 
Ken, I would like to see the RF deck.  Can you send pics?

Bob  W6TR
----- Original Message ----- 
From: "Harold Mandel" <ka1xo at juno.com>
To: "'Ken'" <kloc at commspeed.net>; <amps at contesting.com>
Sent: Thursday, June 08, 2006 9:40 AM
Subject: Re: [Amps] 4-1000A Input matching


> Dear Ken,
>
> Since you plan on some renovation you might want to
> look at a bunch of items.
>
> Will you be running the amp with a Grounded Grid or
> will you run Grid-Driven?
>
> If you decide on Grid-Driven, the 4-1000A's will
> really "come to life" for you, and provide you with
> a superb machine.
>
> In this case, installing a neutralizing circuit similar to
> the Tetrode circuits Rich Measures AG6K has on his
> website <somis.org> will provide protection for your
> tubes, a better input match and a superior signal from
> your amplifier.
>
> The secret is to use a combination of small roller inductor and
> air-variable capacitor in the neutralizing circuit.
>
> When combined with a toroid transformer to match the
> input impedances of the 4-1000A's to the exciter, the
> total input circuit is a simple affair that does all you need it
> to do to achieve better efficiency.
>
> Hal Mandel
> W4HBM
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Ken
> Sent: Thursday, June 08, 2006 8:21 AM
> To: amps at contesting.com
> Subject: [Amps] 4-1000A Input matching
>
> I picked up a grounded grid, dual 4-1000A, linear from a friend.
> After building a 3000-6000 volt power supply, I would like to include
> an internal tuned input to cover 80-10m. Does anyone have a suggested 
> design
> or diagram I may use?
>
> Ken WA4MNT
>
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