John Curl's Blowtorch preamplifier

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Let me be clear: Edmond is LEADING WITH A CONCLUSION, in other words, that he has already made up his mind about feedback and its relation to open loop linearity, and is not interested in going further.
PMA is 'advertising', something that I am inclined to do as well, in showing that he, too, does a good job with open loop linearity.
I am thinking about typical audio IC op amps that are used by the vast majority of manufacturers, in most of the audio equipment that you and I use for practical reasons. For example, why does SONY use a 4558 rather than a AD797? Cost, cost, cost! Rationalized by Edmond, as being 'good enough'. Now do you want to go forward, or just 'dog paddle' where you are?
 
I'm sorry, Netlist, but it just won't work in this case. They just ask the 'question' or 'statement', over and over. I often try to politely ignore people, but they almost invariably stand in my way, and insist that I answer them. Then, they are not often satisfied with my first response, so I get more specific, and then either I am 'BS'ing' or compromising them, and then they yell for their friends. It gets old.

Interestingly enough, I found an input on TAN, a phone network from 1996, 13 years ago, where almost EXACTLY the same questions were addressed at a AES convention, as discussed here last week. The similarity was remarkable! It just shows that I am going in circles addressing everyones' opinions. I don't have enough time left to do this for another 13 years.
 
For linearizaion, don't forget the cross-quad. It is worth noting that you do not need 4 matched devices but two pairs should work fine.
 

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