[Amps] 4-1000A in LK2000

[Dave white]

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 at q.com>
Sent: 04 July 2009 04:29
To: Amplifier Reflector <amps at 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 at yahoo.com
> To: klahaie at centricata.com; amps at 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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