I have never tried. If I had, maybe I would also have heard a difference. That does not mean that the difference actually exists (expectation bias). And if it exists, that does not mean it would be an improvement in every way vaguely imaginable (soundstage, dynamics and so on).So you literally haven't heard any difference in swapping opamps?
I'm not talking regarding v3, infact in any of the designs which use opamps to make differential stage?
To always perceive a difference, and a positive one, suggests bias is at play.
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