Reply To: Power 12v or 9 v? Home › Forums › Products › Stompboxes › Power 12v or 9 v? › Reply To: Power 12v or 9 v? March 26, 2015 at 9:43 pm #138645 toddreynParticipant Thanks so much for your reply! are there converters, do you know, for those 2.5 mm plugs? i'm trying to use my h9 with a volto, and of course, that plug doesn't fit, could I use an adapter, thereby delivering the 9v voltage? Thanks so much again.