About the title of this thread, you did not blow your Empeg by supplying it too many amps. Ohms law applies nicely here. Amps= volts/ resistance. The Empeg will only draw the current (amps) that the combination of resistance in the overall circuit and the voltage supplied will allow. 1100 ma is 1.1 A. 11,000 ma is 11 amps, but either would work! It's just a rating by the power supply manufacturer of how much current the supply can pass without damage to itself.

As already suggested, you probably got the polarity reversed, either through the wrong wiring in the plug or by using an AC power supply.

If you could find what parts are damaged, I'm sure that your friends could remove the old parts and put in new, as long as they know what they are doing.

Good luck

Stu