Phonograph diamond needle 648-DS73. Replaces: RCA 118197, 118198. Used in: RCA RMP-204-9, 117330, 117331, 122123. Tip materials: .0007 Diamond. Radii: .003 Synthetic Sapphire. Speeds: 33, 45 and 78 RPM. House packaged. New old stock. N573SD, 934D, 2913DS, M86XSD, 639SD 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.