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Amazon.com: MaxLLTo 6ft Extra Long AC Power Replacement Adapter for Casio Keyboard CT-610, CT-615, CT-630, CT-636, CT-638, CT-640, CT-650, CT-657, CT-660, CT-656, CT-670, CT-770 : Electronics
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PwrON Compatible AC Adapter Replacement for Casio CT-636 CT636 CTK-2100 CTK2100 Piano Keyboard 9VDC Power PSU - Walmart.com
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