9volt DC mains adaptor around 50 hz (Kingsmead)

LIke the one in the image...discovered we've been using the wrong voltage (too high) for appliance which has not been too happy, and wondering if the right one might be found through freegling. [ah anyone have those cupboards of random chargers and leads!]
Not very savvy re amps and hz so am including an image of the right kind or thereabouts. Would also welcome any education!
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