Sony Phono preamplifier used in some integrated amplifiers (RIAA curve)
Easy to DIY, good and affordable sound
Recommended opamps for MM (Moving Magnet) Cartridges
• Texas Instruments OPA1612 / OPA1611
• Very low noise (1.1 nV/Hz).
• Ultra-low distortion (<0.000015%).
• Excellent bandwidth (40 MHz GBW).
• Widely used in high-end audio.
Texas Instruments OPA2134
• Very popular in Hi-Fi audio.
• More economical and stable.
• Slightly higher noise (8 nV/Hz) but sufficient for MM.
• Smooth sound, widely used in DIY and commercial equipment
It is necessary to make a very clean split type power supply, it is recommended to use quality three-terminal regulators type 78M15 and 79M15 and be careful to have good filtering.
