@dogberry: Yep, Harvey Rosenberg was the most interesting, entertaining guy in the entire history of hi-fi. I met him at SoCal retailer Havens & Hardesty, where he did an in-store to introduce his New York Audio Labs Super It phono stage.
Harvey was a well-known Decca pickup fanatic and expert, whom I subsequently wrote for advice concerning the subtleties of optimizing that design’s very finicky nature. He actually called information to obtain my phone number, and called me in SoCal from New York! We also shared a love of the QUAD ESL and OTL amps (Harvey is best known for buying the rights to the Futterman OTL and re-engineering it), but in his last years became a proponent of horn loudspeakers and single-ended triode amps.