Just a heads up, this power supply is hard to find in person (impossible?). I ordered a generic power supply from KVGear, but he didn't mention that he was out of stock and on backorder, and I didn't get word until 9 days late. He basically told me it would take 3 weeks to receive from ordering.
The Korg KA350 is the adapter you want anyway, not a knockoff Chinese adapter that could burn up your $300 synth. I ordered from Sweetwater, $26.95 and free shipping. Guitar Center has the same price. Personally I would pay the money and just get the legit adapter. I don't think you want to mess around with saving $10 when it could destroy a synth if it wasn't built proper.
Amazon be warned, if you buy a KA350 from Amazon, you're likely getting a Chinese knockoff based on the reviews people are posting.
Monologue Power Supply
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