[Jukebox-list] AMI F80 Hum problem

Can anyone help me with this please. In the video is my G80 with a rebuilt amplifier. It plays beautifully. However, the other cartridge a when plugged into the amplifier makes a continuous humming noise. It will play fine but still hums. I cannot figure out why it continues to do this. Can you please help with this question. Thank you. IMG_4667.MOV https://drive.google.com/file/d/1N1Wo3b6o0sPdx98nQ8GGDPYtfcbPlPp-/view?usp=drive_web