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I think they test cartridges using a standard record with a steady tone, maybe 400 cps. Music would be all over the place. The best test is to hook one up and "see if it works."
From the pictures, the changer could use being taken apart and all the old grease and dirt cleaned out and white lithium grease and light oil used sparingly, keeping any oil off the rubber idler wheel. The wheel and every part it bears on can be cleaned with alcohol for better traction.
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Reece
Perfection is hard to reach with a screwdriver.
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