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He's not completely correct on stuff he says in there, just so you know.

For example he states that PP amps will sound harsher on account of even ordered cancellation. This statement is false. He glossed over a bit in that no mention of the kind of non-linearity is mentioned (Quadratic vs Cubic in this case). In addition, he seems to not understand that the 3rd harmonic is treated much the same way as the 2nd by the ear. He compounds that error with false comments in various places in the video. He is correct though that you do want to minimize the 3rd an PP circuit.

In case there's any question about the 3rd being a problem to the ear, any properly functioning analog tape recorder produces a 3rd harmonic as its dominant harmonic distortion.

Ultralinear can be used in class A as well; he seems to gloss over this fact. The reason to use class A, triodes, ultralinear and other techniques is to minimize distortion because feedback isn't going to eliminate it- the more distortion the open loop circuit has, the more the closed loop circuit will have too. So there are class A ultralinear amps out there.

I'm not debunking this video- but I am saying its not 100% correct. For example you can build an ultralinear amplifier using only a pair of power tubes and a single 12AT7 or 12AU7. He is saying something else at 18:30 in the video...

At the same time there's a lot of really good information here.

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