GRE Super Amplifier 3001 power supply?

[KI4LIV]

I recently picked up a GRE Super Amp 3001 used off Ebay for $16 (yeah - CHEAP!) but it didn't come with a power supply.. I've tested it using another 9v wall wart that i have, but not sure of what the power draw is on this thing..

Can someone who has one tell me what the amperage is on the original power supply?

 

[Dugout6]

Power Adapter- RS model 27-1767 9V 300mA with a M adapta plug. Make sure the tip is negative (-)