Try plugging the CJ directly into the wall outlet that the conditioner is using.
Try using a cheater plug on the amplifier or preamp.
If your audio system is connected to your cable system disconnect it and see if the hum goes away. Otherwise simplify your system AMP, Speakers, Preamp, CD nothing else and disconnect any other cables attached to those pieces and keep adding until the humm identify's the component(try a cheater plug)
Good luck ground hums are a pain to resolve sometimes, I found one in my system coming from a crappy Monster Cable interconnect.... I tore my system apart, bought conditioners etc... it was a bad interconnect.
Try using a cheater plug on the amplifier or preamp.
If your audio system is connected to your cable system disconnect it and see if the hum goes away. Otherwise simplify your system AMP, Speakers, Preamp, CD nothing else and disconnect any other cables attached to those pieces and keep adding until the humm identify's the component(try a cheater plug)
Good luck ground hums are a pain to resolve sometimes, I found one in my system coming from a crappy Monster Cable interconnect.... I tore my system apart, bought conditioners etc... it was a bad interconnect.