Yes it would damage it. You can run it on more amps than it is rated for - it will only draw what it needs. However you cannot run it on a higher voltage than it is rated for - you will release the magic smoke.

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Do you think there's a strong chance I damaged it permanently? That would be a real bummer.

I picked up an 8v/2.5a power supply. I was hoping that it would work out, but I wonder if even the extra 1/2 volt would be too much.