@tomic601, your mention of mentoring has jogged my memory (too much alliteration? ;-) . Everyone who met or even read the writings of Harvey Rosenberg knows what an interesting character he was. He was also a generous man, as I found out in the mid-80's.
Harvey was famously known for his love of three hi-fi produtcs: the original Quad ESL loudspeaker, the Futterman OTL amplifier, and the Decca cartridge. I had a Decca Blue back in '73/4, then moved on, along with everyone else, to a Supex SD-900e moving coil (into a Levinson JC-1 head amp). By the mid-80's, my interest in the Decca had been rekindled, partly because of Harvey's writings about it. He obviously understood the cartridge better than anyone else, so I wrote him (no email ;-) at NYAL, asking him every question I could think of about the Decca.
One day the phone rang, and it was Harvey. I hadn't included a phone number, but he called Glendale information and got it! He started talking about the Decca, but soon had to put me on hold to take care of something (a knock at the door, perhaps). I put down the phone, and ran for a pen and paper. When I again picked up the phone, he was yammering on, oblivious to me not being on the other end ;-) . He told me ALL about the cartridge: capacitive and resistive loading, appropriate arms, damping, etc. I wrote it all down, and still refer to my notes. Thanks Harvey, you are greatly missed.