Not sure if this is the same problem, but a few days ago i bought a new PT01 scratch. So after unpacking, plugging in the dc and listening to a record for the first time over headphones i heard some noise. Funny thing was the noise got louder when i got near the needle like a theremin. Without the headphones over speakers i had to turn up the volume to max and hold my ear on the speaker to hear it, but it was there. As i cut on headphones all the time i thought i had a defective unit and sent it back. The Shop i got it from ran some test, but couldn't hear anything, but they used a powerbank. After i told them to use the included DC they were able to reproduce this problem even with other and older devices. It seems that the power adapter is creating this noise and probably all units have this. I requested my unit back as i'm going to use it with a powerbank anyways and we all know that numark wont do shit about it.