There's a section in the Empeg FAQ about AC adapters...I'm using an adapter that came from an IBM laptop for my recently-purchased unit...

FAQ Linky

Randy
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Happy owner of 2 Centrals, 2 Empegs Mk2a 160GB, 1 Empeg Mk2a 60 GB, a Rio Riot, 4 Rio Receivers, and two 1GB iPod Shuffles...