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It is not a tricky issue at all

Posted by 6AS7_6SN7 on October 13, 2010 at 01:14:20:

These are the (simulated) output spectra @ 1.2A peak current (in 8 Ohm speaker) of my dummy schematic with (top) and without (buttom) the 100 Ohm resistors.

As at 300 Hz negative feedback (with the 100 Ohm resistors) is working 'full steam ahead' the overall distortion is MUCH BETTER than without the 100 Ohm resistor.

And this is exactly as it should be according to known electrical theory, because negative feedback not only reduces output impedance but distortion too.

You can also see that in the case at hand odd distortion with zero feedback exceeds 0.1%, the supposed upper limit recommended by the still unknown/unpublished General Electric study of 1960 mentioned so many times by Ralph.

Best Regards
Luca