21V 1.5A dc power adapter 21 volt 1.5 amp Power Supply input 100-240v DC 5.5x2.5 Power transformer - AliExpress
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AC Adapter Compatible with Korg AL1021/A Power Supply SP300, 21Volt , TRA0003008 | eBay
UpBright 21V AC/DC Adapter Compatible with Model JLH282101300U C22.2 NO.223-M91 +21V DC21V 21.0V 21 Volt 21 Volts 21VDC 21.0VDC 21 V Class 2 Power Supply Cord Cable PS Wall Home Battery Charger
Amazon.com: MTYTOT 21V 1000mA Power Adapter Supply AC to DC 21 Volt 1A 800mA 450mA Power Supply Transformer 5.5mmx2.5mm us Plug : Electronics