Considerations for 78rpm Records Please note that it’s not advisable to play shellac 78rpm discs with a 33/45rpm stylus. Meant to track the ‘microgrooves’ of 33s & 45s, it will sound poor and cause undue harm to the shellac (and potentially the cartridge!). Sumiko has developed RS 78 for this very reason. The stylus tracks the grooves properly and reduces the risk of harm to your collection. Keep in mind that Rainier, Olympia, Moonstone, Wellfleet & Amethsyt are stereo MM phono cartridges, meaning that their normal job is to transcribe 2 channels (left and right) of musical information. When using RS 78 with any of these cartridges, what you’ll hear is the one channel of musical information (mono) of the 78 in both stereo channels.
