the power supply specs: has to be at least 900mA 9V
specs below sourced from a replacement part sold by 3rd party but i assume the specs match the original PSU!
Parts Express: http://www.parts-express.com/9-vac-1000ma-ac-adapter--120-1030
Overview
This high quality AC adapter is useful for many applications. Always select an adapter with the same voltage.
Highlights
9 VAC output
2.1 x 5.5 mm right angle plug
6 foot cable
UL listed
Part # 120-1030
Price $11.62
9 VAC 1000mA AC Adapter
This high quality AC adapter is useful for many applications. Right angle plug. In most applications, you can use an adapter with a higher capacity. However, always select an adapter with the same voltage.
Specifications: • Power output: 9 VAC, 1000 mA • Maximum power output: 9W • Input requirements: 120 VAC, 60 Hz • Plug tip size: 2.1 x 5.5 mm (right angle) • Cord length: 6 feet • UL listed.
Note: Output voltages are rated at full load. No load voltages can be up to 50% higher.
PRODUCT SPECIFICATIONS
AC Output Voltage9VCurrent Capacity1000 mA
Center/Tip PolarityACPlug Size2.1 x 5.5 mm
Input Voltage110~120 VAC
9 VAC 1000MA AC ADAPTER
BrandParts ExpressPart Number120-1030
UPC848864003672