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RE: The important thing is how the ear percieves distortion.

"I also agree that speakers that are easier to drive (and IMO, higher impedance as well) are quite a boon as it then becomes possible to have some serious sound pressure without a lot of amplifier power. Some amplifiers (zero feedback in particular) are best run such that the output power probably does no exceed 20-25% of full power. This helps keep the distortion down, often to the point of inaudible and unmeasurable. "

Now that's what I'm talking about!

A SE amp with a very linear driver tube and a very linear output tube operated in the most linear way possible to the point that the first 20-25% (as you say) of the operation is so linear that there in almost no mechanism for producing harmonic distortion.

The increase in current (decrease in voltage) half of the operation, of both the driver stage and the output stage, is the same shape as the input and the same size as the decrease in current (increase in voltage) half.

There is almost total symmetry, thus no distortion and all without the need for GNF.

As you already know, to me that's the big advantage of Class A done right.

Tre'


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