My bass player lost the ac adapter to his 3630. Looks like it uses 9v ac 830 mA. I've got a Harman ac adapter from an old Digitech RP100 that is ac 9v 1300 mA. Think it's safe to use on the Alesis 3630? BTW, the Harman has a red tip on the end of the barrel. Don't think the Alesis did. Not sure if that means anything.