I have no immediate answer for you. It does not pass a signal through any electronics. Check your continuity and see if there are any issues.
It is also is static balance with spring tension for vtf. Make shure you have the correct vtf. If not, and it is extremely low, it could effect the volume.
Pretty, though.
If you move the internal power transformer to an external project box, replace the tone arm cable and damp the arm tube.....it raises the bar significantly.