sounds great brent, i need to call paul now and see if he'll fix mine. i'm more than happy to throw $120 at this ad500 (mine) to get the power lead fixed. the crystal didn't die, i just wired a 4pin XLR incorrectly and shorted the unit out.
thanks for reporting back.
EDIT:
paul said he thinks he can fix my ad500, too. here's his diagnosis before seeing the unit:
Generally there is a "crowbar" protection circuit which is designed to protect backwards wiring. The fuse will blow if power is connected backwards, but my assumption is that the protection diode shorted as well.
freaking A, this is great news to start the day.