The power supply you need is an H PRO PS-200R. It's 9.6V and 300mA with negative to centre polarity. If you tried to use a multi adaptor (DC-9 etc.) then it'll be mega noisy as it needs 9.6V. A Line 6 DC-1 supply would also work as it has the same rating. Not sure if we have any left but R&B often stock the DC-1.