<b>Notice:</b><br> As a phono preamp, it is suited for MM turntables only. Do not support MC turntables. <br> As an AUX preamp, it is suited for devices like CD, DAC, PC, cellphone. <br> Please note as a phono preamp, it can only work with MM turntables. Please note your turntable should have no built-in phono preamp. If it has, please make sure there is a PHONO OUT/LINE OUT switch and you should put it on PHONO OUT position. <br> We do not recommend using it with class D amplifiers since most class D amplifiers have much noise. <br> <br> <b>Parameters:</b><br> 1. RIAA phono part: <br> RIAA freq response 20hz-20kHz +/- 0.5dB, S / N ratio> 85dB<br> THD <0.05%, input sensitivity 3.0mV, gain 40dB<br> Nominal / max output 300mV / 1.8V<br> Output impedance 200 ohms, input 47k ohm / 220 pF<br> 2. AUX part: <br> Input voltage: AC12 ~ 18V<br> Frequency response: 20 HZ - 20 KHZ<br> Input sensitivity 300 mv<br> SNR: 96 db<br> Total harmonic distortion <3% (1 KHZ) <br> Power range output: 0.2 W<br> Output impedance: 100K<br> Input impedance: 50K<br> <br> <b>Chassis size:</b><br> 80×116×28mm<br> <br> <b>Net weight:</b><br> 0.24Kg (0.55Kg with package) <br> <br> <b>Package includes:</b><br> 1 x preamplifier<br> 1 x power supply<br> 2 x 6J1 tubes<br> <br> <b>What's more:</b><br> It will be better if its GND jack can be really connected to the ground, which can decrease the background noise to a very low level. <br> For MM turntables, please check whether your MM cartridge is the old version. If so. we suggest you to upgrade it as a new version one will bring much better sound. <br> Please keep T7 away from devices that can transfer signal like cellphones and routers. <br>