Magnetic-Pickup Phono Preamplifier

This is a simple circuit of magnetic pickup phono preamplifier. A proper loading to a reluctance is provided by this circuit. Here is the circuit:

The gain provided by this circuit is approximately 25dB at 1kHz (2.2mV input for 100mV output). Referenced to 10mV input at 1 kHz, the S +N/N ratio is better than -70dB and the the dynamic range is 84 dB. This circuit also provides feedback for RIAA equalization. [Source: National Semiconductor Application Note]