power cord upgrade

I recently bought vintage accuphase preamp. It has detachable power cord but it is not 3 prong but only has 2 prongs. I have only seen 3 prong power cables. Does anyone know of an adapter so I can use my 3 prong power cables.
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PS Audio and Cardas both make PC with the 2 prong C-7 connector... Check AA or Music direct.
X-Port By Audioparts IEC/AC ADAPTER
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