I think John Lyles' summary is excellent.
He goes on to say:
> Low Mu tubes are best for
> series pass tube regulators, as they have a low drop across the tube
> with widely varying load current.
This statement is true but the low drop is not a result
of low mu but rather of low Rp. For a given Gm a
lower-mu tube will have a lower Rp, generallly
considered desirable for varying-load situations.
- Jim Tonne
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