It'll be a switch-mode PSU, the amount of current it's *capable* of outputting is fairly irrelevant, as long as it can meet the minimum requirements.

Check it has centre positive (probably says on the label) and if the jack fits it should work. Keep an eye on the empeg as you plug it in, if it doesn't come up immediately pull the power out. There's quite a bit of protection circuitry to deal with reverse polarity (etc) but it's always better to be on the safe side!

Hugo