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RE: Ah, but that's the point ...

"A preamp with only minimal swing requirements could happily run Class A at numerous operating points along the load line..."

When you say Class A do you mean A. running the tube in the most linear way possible or B. running the tube so that plate current never cuts off?

A tube can't be running in the most linear way possible and at the same time be operating in the non-linear cutoff region.

A tube operating in the non-linear cutoff region (but not cutting off) meets some people's definition of Class A.

My whole point is that Class A is more than that.

Class A is (according to all the examples in all the books) operating a tube only in the most linear part of the curve.

If, in your preamp tube example, the preamp tube's operation is staying in the most linear part of the curve anyway, why not bias it in the middle of the most linear part of the curve? What would be the harm in that?

As you point out, a power tube is more limited. If we want some power and we want the tube to operate only in the most linear part of the curve we pretty much have to bias it in the middle of the most linear part of the curve.

Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"

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