I used this phono pre amp to hook my 1980's Technics SL-D303 turntable to a Sonos speaker system in my house. This is the type of amp you want to use for a record player all pre amps are not meant for this use. I mostly play rock albums and the sound quality I am getting makes me happy. The ground lug is great to have and is needed if you have an old turntable to keep the hum noise away. I'm not hearing any hum with my setup. Since I'm using it with Sonos there is a adjustment in the software to adjust what the line input is from the pre amp. I tried a few settings and got it perfect. Happy to buy made in USA as well.