only a few weeks ago my RP350 pedal stopped working and it's adapter as well.
I send my pedal to repair and I got it back. lovely...
But I don't if I should buy a new adapter from the guitar shop (expensive, but Harman pro), I also considered to buy an adapter from any electronic store.

Any words of wisdom?
Dukey Uses & Abuses:

A Jackson Kelly, A Gibson Les Paul, 2 Fender amps,An Ibanez bass, A Digitech RP350
Just make sure the adapter you buy has the same voltage as the harman one does.
Guitars: Fender FSR Standard Strat, Squire Affinity Strat, Epiphone Nighthawk
Amps: Vox AC15C1, Roland Cube 15x, Peavey KB-1
Pedals: Digitech RP355, HD500, Joyo AC-Tone, EHX Soul Food