No, the 4-1000 is wired with both grids grounded for GG operation. The
degradation in the amplification factor is so slight as to be negligible.
Don't forget that in the GG configuration the grid itself acts as a screen
between the input and the output, so that the screen grid just adding its
own isolation.
Alex 4Z5KS
-----Original Message-----
From: amps-bounces@contesting.com [mailto:amps-bounces@contesting.com] On
Behalf Of RICHARD SOLOMON
Sent: Saturday, July 04, 2009 6:29 AM
To: Amplifier Reflector
Subject: Re: [Amps] 4-1000A in LK2000
Can I ask a dumb question ??
What do you do with the Screen Grid ?
Don't you need an additional screen supply ?
73, Dick, W1KSZ
> Date: Fri, 3 Jul 2009 20:26:01 -0700
> From: wc6w_amps@yahoo.com
> To: klahaie@centricata.com; amps@contesting.com
> Subject: Re: [Amps] 4-1000A in LK2000
>
>
>
> Hi Kevin,
> The input impedance of a 4-1000A in "strapped" grounded grid is circa 110
ohms.
>
> A 3-1000Z runs around 65 ohms.
>
> Some input network tweaking will be necessary with a transistorized
driver.
>
> 73 & Good evening,
> Marv WC6W
>
> http://wc6w.50webs.com/
>
>
> <snip>
> >
> > Is the input impedance that different from the 3-1000?
> >
> > 73 Kevin K7ZS
>
>
>
>
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