I told Bruno the only way you would know if you got rid of the hysteresis in a ferrite coil would be to A/B his coil with an air core coil and listen. This is how you know somethng.....by actual listening tests......not by a made up measurement test that has no basis in sound quality.
Measurements are objective, they have no bias. They have a basis in reality, unlike subjective listening that varies from person to person. If there was one best sound, there wouldn’t be so many different and successful amps in the market place. Your idea of good sound is just that, your idea. It has no basis in reality for anyone else. Eye witness testimony has been proven time and again to be unreliable. Your ear witness testimony is flawed for the same reason. At least Bruno delivers an honest product that delivers as advertised, rather than some magic guru fantasy tweak that simply, at best, just adds more noise to the signal.
If Bruno listened to everything he did and was all knowing.....then maybe not. He does not listen to everything he does and is not all knowing.
Bruno produces products that amplify a signal as cleanly as possible. If people like distortion, they can add it themselves in any flavor they prefer. He doesn't push his subjective tastes on others and claim he knows what sounds "best" -he isn't all knowing but he does know that. I can't say the same for you.