Been using my amp without the 47k jumper, what’s the effects of fitting one, the phone cartridge says 47k recommended. Thanks
Without the 47 kohm termination resistor, moving-magnet cartridges usually have a peak in their response somewhere above 10 kHz. The power handling of the resistor doesn't matter much, as it will typically dissipate less than 0.000001 W.
Thanks Marcel, also seen somewhere a small capacitor in with these resistors any info on these ?
That also affects the response above 10 kHz, but the optimal value depends on the cartridge model, the cable capacitance and the RIAA amplifier's capacitance. The optimum will usually be somewhere between 0 and 330 pF.
You can either look up the capacitance recommended by the cartridge manufacturer, measure the cable and amplifier capacitance, calculate the difference and round it off to the nearest standard value, or just experiment with a few values between 0 and 330 pF and use whatever sounds best to you.
You can either look up the capacitance recommended by the cartridge manufacturer, measure the cable and amplifier capacitance, calculate the difference and round it off to the nearest standard value, or just experiment with a few values between 0 and 330 pF and use whatever sounds best to you.