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A Modern Misconception

"It is my understand that the higher load impedance (to lengthen and straighten the linear part of the curve) is part of the Class A package.

From all the reading I've done, Class A is not just one thing, it's a whole package with the intent of achieving the least harmonic distortion possible (while still leaving some power in a power stage)."

That's incorrect. If the definition of Class A includes linearity at all, it is only from the perspective that operating a single-ended stage at the midpoint between cutoff and saturation will generally provide low distortion results. At the time this class designation was assigned to its respective operating condition, reducing distortion to the levels we expect today was not a consideration. What you're reciting is the modern use of Class A in an audiophile implementation. It carries an emphasis on reduced distortion - at the expense of output power - that is not a component of the original definition of Class A operation.


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