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[AMPS] Input Z

To: <amps@contesting.com>
Subject: [AMPS] Input Z
From: n2bc@stny.rr.com (Bill Coleman)
Date: Mon, 28 Feb 2000 00:41:39 -0000
Thanks Rich.  Here's where I display my stupidity...   I was going to avoid
a swamping R type of input circuit. But I suppose for a sand-state exciter
the swamping R presents a more stable load - is this true?


----- Original Message -----
From: measures <2@vc.net>
To: Bill Coleman <n2bc@stny.rr.com>; AMPS <amps@contesting.com>
Sent: Sunday, February 27, 2000 11:20 PM
Subject: Re: [AMPS] Input Z


> >
> >How do I determine / where can look up the input impedance for grid
driven
> >tetrodes?  I'm not satisfied with the input circuit I have in there now
and
> >want to give it another try.
> >
> In Class AB1,  input Z is essentially the reactance of the grid-C plus
> the grid-termination resistance.  The practical  choices of grid term. R
> are 12.5-ohms (4:1 bifilar transformer), 50-ohms (direct), 200-ohms (1:4
> bifilar transformer)  and 450-ohms (1:9 trifilar transformer).
>
> cheers, Bill


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