Phonograph needle, diamond, Astatic N808-sd, replaces Pfanstiehl M853-DS73, replaces Astatic 794-sd, replaces: Tetrad T5HD, Tetrad T5HS, Tetrad 52, 54, 62, 64, A2, A4, B2, B4, C2, C4. Used in: Tetrad 52D, 52S, 54D, 54S, 62D, 62S, 63D, 63S, 64D, 64S, A2, B2, C2. Example: 6-B2D-C; 2-62D-Z2. Tips: .7 mil diamond and 3 mil synthetic sapphire. Speeds: 33, 45 & 78 RPM. New old stock. Search my store titles AND descriptions. Enter needle no., cartridge no., or brand name.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.