I've had problems powering up my H9 at outdoor gigs using the factory wallwart. It never seems to be an issue inside. I have a Rifftone Performer Power Block which powers all my other pedals. It is center negative and does not have a 500 mA out.
From searching the forums I've learned some of the stompboxes will operate at 12V with lower amp ratings. The Rifftone has a 12V 250 mA out. If I used a polarity adapter will this be adequate to power the unit? Am I in any danger of damaging it if I try it?
The Rifftone also has two 9V 250 mA outs. If I bridge these using a VooDoo Labs current doubler (Y connector) and reverse the polarity, will that work? I don't know much about electronics. My concern is if using a Y will double the voltage as well as the amperage and damage the unit.