> The downside is that you need tuned circuits in the
> cathode for decent linearity - I was always surprised at
> the 30L1 not having those.
Do you mean the S1?
> The grounded cathode tetrode with grid swamping isn't to
> be discounted, but can have the linearity improved with
> negative feedback, without too much difficulty.
> Does this answer the question?
If you look at actual tests of IM all these "clean" grid
driven 4CX800 tetrodes are nowhere as good as a cathode
driven 3CX800 or similar.
When you look at the regulation and protection required for
screen and control grid bias systems there isn't a penny
saved. The only thing cheaper is the tube, and that is true
only while you can still buy them from "surplus"
distribution.
73 Tom
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