RIAA Preamplifier using NJM4558 / JRC4558 Op Amp

This RIAA preamplifier circuit is based on the NJM4558 (or JRC4558) operational amplifier (op amp) IC. This IC is used in many high-end commercial applications from big names such as Sony, Panasonic, and Samsung, due to its good cost/performance ratio. The phono input has sensitivity of 2.5 mV per 47 kΩ, and the RIAA deviation is ±0.5 dB. I have made this circuit a few times for use with moving magnet, and high output moving coil cartridges, and it works extremely well. This circuit uses 0.0024 µF (2.4 nF or 2400 pF), and 0.0082 µF (8.2 nF or 8200 pF) Mylar film capacitors which might prove difficult to source, however you can always make up the values by combining multiple capacitors.

For the operational amplifier IC you could use the NJM4558D, or the NJM4559D, as they both have internal frequency compensation and high voltage gain of 100 dB typically. The NJM4559D has gain bandwidth product of 6 MHz, whilst the other has 3 MHz. The JRC4558 also works in this circuit and it is available readily and cheaply (20 chips per pound on eBay). These are all dual operational amplifier packages with the same pinout.

Components