To produce a pre-amplifier with accurate RIAA response, this circuit use two stages of amplifier. This circuit is more complex than single op-amp RIAA pre-amp, but the performance is excellent in terms of accurate frequency response. Here is the schematic diagram of the circuit.

accurate riaa pre amp circuit schematic

The circuit uses LM833 high performance op-amp from National Semiconductor, giving the best performace of 0.1 dB response curve error, compared to the standard RIAA curve. [Circuit’s schematic diagram source: National Semiconductor Application Notes]