9V myVolts replacement power supply compatible with Casio CTK-601/CTK-631 Keyboard | Fruugo US
DC 9V Power Supply Adapter for Casio CTK-574, CTK-591, CTK-601 Keyboard Piano 5055329377307 | eBay
Casio CTK601 Service | PDF | Input/Output | Synthesizer
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Amazon.com: MaxLLTo 6FT Extra Long 9V AC DC Power Adapter Supply for Casio CTK-550, CTK-551, CTK-601, CTK-611, CTK-615, CTK-620L Electrical Paino Keyboard : Musical Instruments