For sale is a PS Audio Humbuster. Works fabulously to get DC off of your electrical lines, a common source of hum from components. In my old apartment, my amp hummed so loud I could hear it from my sitting position. Insert the Humbuster, and the hum disappeared!
New apartment doesn't have a problem with DC on the line so the Humbuster is no longer needed. Hopefully it can solve a problem for someone here on AC.
$0LD.