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Compatible with LP 78. When the needle tip is driven horizontally (left + right), the output voltage phases of the left channel (L) and the right channel (R) should be the same. When the frequency F is 1kHz, the vibration speed V in the sound slot L or R direction is 3.54CM/S or the vibration speed of the horizontal sound slot is 5CM/S, the output voltage is corresponding to the specified value (250MV) (i.e., within the range of 200~300MV). When testing the tracking capability and electrical parameters of the cartridge, the needle pressure should be measured within the range of 40±10MN. The wear life of the ruby needle is about 120H.