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Feedback gives the amp a second chance to distort

Posted by Ray Moth (A) on January 20, 2007 at 18:07:43

In Reply to: Re: common misconceptions posted by Tom Bavis on January 18, 2007 at 14:30:47:

If the signal that is fed back contains harmonics, then the amp happily creates higher harmonics from them. We hope they will be at too low a level to be objectionable, but they may not be, especially because of the increased risk of intermodulation with a complex signal (as most music signals are).

Perhaps this is why triodes with NFB can sound worse than without it? The triode's simple harmonic spectrum - mostly 2nd with a lesser amount of 3rd, becomes more complex with NFB,

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