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depends on the cartridge. some cartridges need more to track without distortion. Zenith 2g cartridge was 2.5 to 3 grams, most ceramics needed 4-5, maybe 6, and the high output types and power point style ones needed to track at 8-10 grams. tracking force is related to the stiffness of the cartridge suspension. plus the friction of the arm bearings and trip mechanism need a certain minimum. most V changers need 4g or more to operate reliably, the Zenith 2G version has better bearings.
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