I think this is the crux of the issue.
I don't think it's that contentious to say that different tubes (and amps) might sound different when driven far past clipping.
Show me the measurements the do capture the physics in play and we’re good. This isn’t saying, “I can’t hear that”. Your tested data, although accurate to the tests resolution, is incomplete “proving” there is no difference when we know for a fact there is. A simple device is limited by what we...
Thanks to all for sharing their info and experiences.
Mine became bad enough to bother me after a really loud concert where I forgot my earplugs.
I'm mostly able to forget about it, and I suspect that mine is very mild compared to many, but I think I have the personality to "notice" it often...