Right to the point: Is it OK to use a Power Supply rated at 9VAC / 800mA on a device that calls for a Power Supply rated at 9VAC / 500mA ? The long version: I just purchased a used RNC1773 Compressor. When it arrived I noticed that the wall-wart type Power Supply provided is rated at 9VAC and 800mA, and is made by ART. Looking on the back of the compressor near the power supply input I see 9VAC and 500mA. Looked fishy. I asked a buddy who recently purchased a new RNC1773 to look at his power supply. It shows 9VAC and 500mA - made by GlobeTec. So it appears the Power Supply I was given is not an original. Not wanting to fry the unit, I contacted the seller and asked them if they had made a mistake and sent the wrong power supply. Their reply was: "That should be the power supply I had with it, and it's fine to use. As long as the voltage is correct, any power supply with MORE milliamps than is required is safe to use. A power supply with less milliamps than required cannot be used. Thanks." So before I plug this thing in, I'd like to know from a disinterested (hopefully authoritative) third party...is what the seller wrote accurate? Is it really OK to use the power supply he provided? Thanks a TON !