Double check all of the specs below before buying

The output is AC (not the more common DC)

Class 2 AC Wall Power Supply Adapter 9VAC .5A

• Manufacturer: IEC / Atari
  
• Part: ADA090504 / CO61516
  
• Type: AC Wall Power Supply Adapter
• Input: 120VAC 60Hz USA 2-Prong Plug
  
• Output: 9VAC 500mA
• Unregulated
• Straight Plug
• Connector: 2.1x5.5mm (Center/ Outer Diameter) Center Positive
  
• Cord: 6ft.
• Color: Black