I found an AT 15SA body on a thrft store turntable years ago. Of course the stylus was missing/broken. At the time, I didn't realize this was a high end quad cartridge. On checking into this cart, the AT 15sa and AT 20sa are the same, but the 20's were hand chosen for superior specs. Has anyone had success with a new stylus from the internet that worked with this cartridge for cd-4 playback ?