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side question on feedback

Hi,

>This threshold is set not only by feedback factor but also by
>inherent linearity (neglecting DIMD's). If the triode is inherently
>linear then PRF might make it moreso, is what I'm saying.

Here is a side question about feedback linearizing a transfer curve.
It seems to me that when applying feedback and using only a small
amount of feedback (in the range where the harmonics are being
multiplied), a transfer curve is going to be less linear. It is only
until we get over the hump and apply enough feedback (>13dB) that
the transfer curve actually straightens up and becomes more linear
than without feedback.

Is 13dB (or whatever the number is) a magic number where above this,
hi-order and low order harmonics are reduced, and this value holds
for every circuit? It seems intuitively that it could not be a magic
value, but I wonder what the spread is. Could this value actually be
less, say 6dB if the device is very linear, or would it be more, say
20dB? I'm wondering how universal is Cheever's figure 2-15 page 58
with respect to 13dB and devices it is applied to?

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