1Do not put the PHONO connect to the antique furnishing turntables, because most of them are not grounded. 2The internal has a PHONO amplifier, as well as the previous combination of audio inside the PHONO and the carbon core pin of the special turntable to use. 3Use NOVER audio dedicated capacitor as filter, the vocal is very good, the effect is better than the general low-end capacitor filter array. 4Resistance to American DALE or VIS resistors, German ERO output capacitors, decoupled from red WIMA and ELNA brown gods and other advanced resistors. 5PCB used for double-sided gold immersion process, line alignment 1 point grounding.Features:Do not put the PHONO connect to the antique furnishing turntables, because most of them are not grounded. The internal has a PHONO amplifier, as well as the previous combination of audio inside the PHONO and the carbon core pin of the special turntable to use. Use NOVER audio dedicated capacitor as filter, the vocal is very good, the effect is better than the general low-end capacitor filter array. Resistance to American DALE or VIS resistors, German ERO output capacitors, decoupled from red WIMA and ELNA brown gods and other advanced resistors. PCB used for double-sided gold immersion process, line alignment 1 point grounding.Specification: Supply Voltage: AC12VX2 to AC20VX2PCB Size: 11x4.6cm / 4.3x1.8in Op-amp Option: NE5532, 49720NA Package List: 1 x Finished Amplifier Board Note: The board is two-stage voltage amplification, one-stage magnification 47. According to your needs, you can adjust the gain. If you think the magnification is too large, you can put 6-7 feet between the resistance 47K to 4K7 Below (or direct short-circuit 6-7 feet)(finished board no need to change)Please note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.