I recently bought a GT6-B via postage. After probing the seller over email, and be assured that it was 'in excellent condition' and 'came with everything' I now find out that the power supply is a non-original unit. Turns out it's a 12V power supply, of unknown milliamps, when it should be a Boss BRU-120 putting out 14V & 800ma. I can't find basically any details on the said power supply, except the voltage but it's an In-Li YL.41-10-12V. Would running the GT-6B at 12V instead of 14V, over an indiscriminate number of years have potentially damaged anything? Unfortunately the seller has refused to accept the unit for return, or chipping in for a new adapter, insisting that it's a non-issue because 'everything worked fine' for him, and that 'I didn't ask specifically if it had an original adapter'..