If the hum goes away using the Audioquest they may have shielding that is blocking AC power noise from getting into the signal. Switch all the original interconnects back.Then try one interconnect at a time. Also don't run any of them parallel with any AC power cords.Crossing at an angle(90 degrees or so)may get by.The hum that starts after a minute
is strange.If the power cords aren't unplugged from the outlet when changing interconnects,sometimes even with the equipment shut off at their power switch,some AC voltage could be on the chassis causing damage to the equipment.I hope this didn't happen.
is strange.If the power cords aren't unplugged from the outlet when changing interconnects,sometimes even with the equipment shut off at their power switch,some AC voltage could be on the chassis causing damage to the equipment.I hope this didn't happen.