@knotscott,
Ah, the one and only Harvey Rosenberg, or to give him his full title:
Dr. Harvey "Gizmo" Rosenberg
Guildmeister, The Triode Guild
Thermionic Techno-shaman.
Perhaps the most original writer on audio we have yet seen, and the doyen of the audiophile tinkerers worldwide. However in his case the experimenting was never without a clear purpose or aim.
Harvey had strongly held opinions about audio and he stuck to them.
Harvey probably also did more for the cause of the Tannoy Dual Concentrics in the modern era than anyone else.
Who else but Harvey would dare to mod a Tannoy Westminster?
https://www.meta-gizmo.org/index.html