1. The tuning board uses a good layout, the overall size is satisfactory, and the components are arranged neatly. 2. The two NE5532 dual op amps commonly used in the industry are used, and the effect is good, and the 8P chip socket is used to facilitate the user to replace the op amp chip! It is easy to replace the chip you like! 3. There are ten high-frequency and low-resistance capacitors in the power supply capacitor array to reduce power supply interference and good filtering effect! The rectification part uses a rectifier bridge module, not a simple diode!! There is also a white 3P power supply Socket, easy to connect directly to the transformer! 4. Standard potentiometer spacing, convenient for users to install and use in chassis! Name: NE5532 dual op amp front-level tuning board Power supply voltage: dual power supply 9V-15V Potentiometer spacing: 24+24mm Colour:As shown Material:ABS Size:95x70mm Package Contents: 2 x Amplifier preamplifier board Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.