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Consumer Electronics by S. P. Bali

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FEATURES OF STEREO CARTRIDGES

In stereophonic applications, one of the most critical components is the pickup cartridge.

The weight of a cartridge and pickup arm assembly is transmitted to the record as needle force. The maximum allowable needle force without excessive record wear is related to the size of the needle tip. Wear is dependent on pressure, which is force per unit area. The smaller the needle tip, the less the needle force must be to prevent wear. Too small a needle tip size would result in loss of tracking; that is, the needle would skate over the record instead of staying in the groove. Thus the minimum needle tip size is kept to 0.5 mill, and the range of needle force is roughly from 1/2 to 6 grams.

Frequency response is usually ...

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