Hi Dick
Just strap it to ground and treat it as the grid. Sure, it lowers the
amplification factor but if you have a modern 100 or 200 watt transceiver who
cares? I did consider rebuilding my amp as a true grid driven tetrode amp like
the circuit for the 4-400 that appeared in the early 1960s ARRL handbooks but
decided it wasn't worth the hassle. I suppose if - has a 10 watt K3 or similar
then it'd be a different story....
Cheers
Dave G0OIL
-----Original Message-----
From: RICHARD SOLOMON <w1ksz@q.com>
Sent: 04 July 2009 04:29
To: Amplifier Reflector <amps@contesting.com>
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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