Phonograph Diamond needle stylus Radio Shack RS-100, cross-reference Pfanstiehl 464-DS77. Replaces: Euphonics 509 510 512 513. Used in: Euphonics U14, U15, U16, U17, U18, U19 Series. “Miniconic”. Used in Astatic 732, 735, 737, 738, 739, 741. Tips: .7 mil diamond and .7 mil synthetic sapphire. Speeds: 33 and 45 RPM. Needle color may be black or white. Used in Motorola models: SD523, SD654, SD655, SD656, SD657, SD661, SD662, SD663, SD664, SK540, SK550, SK551, SK552, SK553, SK554, SK555, SK556, SK557, SK558, SL650, SK652. New old stock. Search my store titles AND descriptions. Enter your needle no., cartridge no., or brand name. E-mail for further help. IF YOU ARE PURCHASING A NEEDLE Model numbers are provided in manufacturer’s references for the cartridge they installed in those models. If the cartridge has been changed by a dealer or user, this needle will not be correct for the model numbers listed, as it is the cartridge that determines what needle is needed. Be sure it looks like your old needle.