Yeah, 6 interleaved spirals, allowing it to select a track by timing when it drops the stylus. There are 6 electrical contacts spaced around the disc that clos

Yeah, 6 interleaved spirals, allowing it to select a track by timing when it drops the stylus. There are 6 electrical contacts spaced around the disc that close at the correct timing for each track. This is described in the patent (pdf) https://patentimages.storage.googleapis.com/74/b1/1c/cb2bf1218f26f8/US4426691.pdf https://patentimages.storage.googleapis.com/74/b1/1c/cb2bf12...