AC-DC ADAPTER 9VOLTS DC @ 800mA 2.1mm DC POWER PLUG NEGATIVE CENTER

Actually 12V under load. I put a string of 1N4004 diodes in series with it to get the 8V I needed.

Works really well. Make sure you understand the difference between a negative center and a positive one, most musical equipment needs a negative center.

good and now my granddaughter is haqppy playing the key board