[AMPS] Input matching experiment

[wb8jkr@juno.com]

  It would seem to me that using a swamping resistor 
at the cathode of a cathode driven amp would get
rid of excessive drive power and also limit the
maximum swing in the load value the cathode shows 
to the source, but would do nothing to prevent harmonic
currents from finding they're way back to the source.
  I would also think besides the obvious lack of a path
for harmonic currents, in order for a swamping resistor to
allow the amp input to look like a constant load to the
source the resistor would have to be considerably
lower in effective "R" than the cathode. And if that 
were the case the swamping resistor would draw
more power from the source that the amplifier would.

Mark  WB8JKR


On Fri, 18 Jan 2002 19:26:56 -0500 "carl seyersdahl"
<carlseye@tampabay.rr.com> writes:
> 
> In reference to the subject matter. I have an article here written 
> by a ham
> in spain and published by Svetlana several years ago. This gentleman 
> built
> an amp, single 572B, using a home made rf choke and input 
> transformer
> combined, and using a large swamping resistor , about  75 ohms at 40 
> watts,
> untuned input..
>  Just how good it turned out I can't say, but it is an interesting 
> thought
> on the subject.!! I mention this only in the interest of theoretical
> discussion.
>   I have a copy of the article if anyone is interested
>  have a good day all.
>    carl / kz5ca

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