High Quality Cartridge/Stylus Specifications: Frequency Response: 20-20,000 Hz Channel Separation: >18 dB Channel Balance: 2.5 dB (1 kHZ) Output: 3.5mV (1kHz, 5 cm/sec.) Recommended Load Impedance: 47,000 ohms at 1 kHz Stylus: 0.6 mil Diamond conical tip needle , 16 or 33 or 45rpm NOT for 78rpm , 1.5 ? 2.5 grams tracking pressure