They really do thatt with cars? I like mine quiet.
There may be some smoke and mirrors that goes into marketing to audiophiles for sure but placebo tubes seems a bit far fetched. I doubt that would get very far even if tried. Why bother as a maker and too easy to determine as a user. Most smoke and mirrors pitched at audiophiles is the kind that offers large profit margins and is hard to either prove or disprove. You know the old "you gotta try it" ( ie buy it) to know pitch.
There may be some smoke and mirrors that goes into marketing to audiophiles for sure but placebo tubes seems a bit far fetched. I doubt that would get very far even if tried. Why bother as a maker and too easy to determine as a user. Most smoke and mirrors pitched at audiophiles is the kind that offers large profit margins and is hard to either prove or disprove. You know the old "you gotta try it" ( ie buy it) to know pitch.