Website update.

[patchell]

    Hmmm.....what about a pentode ladder filter......that might cut down on the
number of diff amps.  That would be a sight, a moog ladder filter built out of
tubes....(slap..) well, it was just a thought.

René Schmitz wrote:

> At 20:13 27.09.00 -0700, patchell wrote:
> >    Maybe this is a pretty naive question, and please remember, I have
> >never used tubes in anything, so I might be ignorant......
> >
> >    Correct me if I am wrong, but doesn't the screen grid on a pentode
> >tube vary the transconductance of the tube?  Seems like there should be
> >someway of exploiting that to tune a tube based filter.
>
> Right. That should be possible. Varying the screen grid voltage does shift
> the DC-quiescent point. It could lead to a differential design, with plenty
> of diffamps. Looking at my VTVCA, imagine a cap from plate to plate of the
> pentodes whose screengrids are steered. Several of these two pentode stages
> could be cascaded.
>
> Bye,
>  René
>
> --
> uzs159 at uni-bonn.de
> http://www.uni-bonn.de/~uzs159
>
>

--
 -Jim
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