Its possible that youd fry it but ive never tried so i wouldnt know, but if you have another RP or somethin like that you can use it, RP100’s arent really that great though so you can try it, the most thats ever happened to me is it just wont work with that big of a power source, but once you change it back to a 9vac it will work so its up to you, use batteries or take the risk, good luck. Trevor : I’m new to guitars and I just bought an RP100. I have a 12vac 1a power supply but the pedal asks for 9v 1300ma. Will I fry the pedal if I hook this up?