@audphile1
I owned the same headphones. Although Grado was the first to make a moving coil cartridge, he mostly sold moving magnet cartridges back then. The company may have moved back into moving coil cartridges. I haven't kept up. The Grado Reference was a very smooth cartridge. At $1K, probably one of the most expensive moving magnet cartridges back then. It was a demo on a Thorens turntable and I bought both the turntable and cartridge.
I later bought a VPI TNT 3 and the cartridge sounded great on the turntable. I now own a VPI Prime Signature 21 with a VPI Shyla moving coil cartridge. It sounds very good. I think I have moved on from moving magnet cartridges, except I have a Clearaudio Maestro Ebony V2 in reserve, which I will send in to be retipped so I can use it when I send in the Shyla to be retipped. Retipping takes a couple months. The Clearaudio Maestro Ebony V2 is a wonderful moving magnet cartridge with a fineline stylus. When Michael Fraemer wrote a review on it, he said why bother with a moving coil when you can get all of that sound out of the moving magnet Clearaudio.