I am happy with mine. Consider the following changes, made over the years, if interested…
Use good vibration control underneath. Cleaning the glass periodically can change the sound. Use a good contact enhancer on the plugs going to the back of the unit and on the main plug of the cord going to the wall. Use an upgraded duplex and cover plate. A PURON is beneficial when placed near the main power cord on the back of the unit. And a PURON in the unused outlet at the wall.