>
>Rich said:
>
>" With any tetrode, to obtain linear suds, one can vary the grid v. Or one
>can vary the screen v. -- but Not at the same time. In other words, When
>the grid potential varies, the screen potential must be fixed, and vice
>versa. "
>
>WHY NOT?
>
It's not polite to shout.
>For a linear amplifier to result, the plate current simply must be linear to
>grid drive.
ok
>We know from the Eimac curves of the 8171 that gain changes
>with screen voltage.
The 8171 is quite similar to the 4-125A, the 8973, and other tetrodes.
> Logic tells us that for any particular grid drive,
>there must be a certain screen voltage that will yield the desired plate
>current (to achieve linearity).
. There is no certain screen voltage. This screen potential is always
1500v unless you need to make less suds. . My guess is that c. 250v on
the screen would be needed for 1500w out.
> That necessary screen voltage will vary with drive,
not in a linear amplifier.
> but can be plotted and will be a curve. If the G2DAF design
>achieves the desired curve, then that condition of linearity will result.
>
>Your statement is simply wrong.
>
any port in a storm
>There are a number of other factors that would remain, even if the original
>G2DAF design satisfies this requirment of linearity.
''this requirement of linearity'' does not fly.
>......
>
>If any amplifier is to be rejected, it ought to be rejected for the right
>reasons. This is called science.
No amplifier has been rejected. Some generate less splatter than others.
>
later, Colin
- Rich..., 805.386.3734, www.vcnet.com/measures.
end
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