Home › Forums › Products › Stompboxes › H9 Daisy Chain Power Rail Hum › Reply To: H9 Daisy Chain Power Rail Hum April 30, 2020 at 9:58 pm #154775 tsternfeldModeratorEventide Staff If the hum changes tone as you add and remove pedals that aren't the H9, then it probably is the power supply causing problems rather than the H9. The H9 might just be the largest current draw that pushes the power supply past its capabilities.
