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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