Hi Wayne,
That tube runs at just over 100 ohms for all
reasonable operating conditions.
Click on the 4-1000A link at the top of this page:
http://wc6w.50webs.com/wc6wamps/index.html?fr53.html
73 & Happy Building!
Marv WC6W
--- Wayne Rogers <n1wr@chesapeake.net> wrote:
> This discussion about the output impedence of a
> solid state transceiver has
> some bearing on my current problem.
>
> I am beginning to build a 4-1000A G-G linear (I know
> - old technology, but
> thems the parts I have). I am trying to figure out
> the best approach for
> coming up with an input network. My research to
> date says that the
> impedance varies snywhere from around 25 to 200
> ohms, frequency dependent,
> and I would guess is dependent on some of the input
> components (like the
> bifilar choke on the filaments).
>
> So how do I approach the design? I am planning on a
> pi-network with a Q of
> 3 or so. The values are easy to calculate if I know
> the tube input
> impedence, but I don't. I could design for 100 ohms
> and hope for the best?
> Also, with a low Q I'm expecting to have only one
> of the three pi-network
> components variable, but which one? What has your
> experience been? I am
> building this amp for the low bands - 160 - 40, so I
> won't have to deal with
> the problem of making a 4-1000 play on ten meters.
>
> Any input appreciated. Thanks in advance.
>
> Wayne N1WR
>
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