using a stereo RCA to 1/8" stereo miniplug adapter

I take it that this is something you bought from the RadioShack (or similar)? That is, is it a reputable adapter, or is it possible that it's broken? (I'm not sure whether being from RadioShack is reputable or not....)

What are you using as the AC adapter for the empeg? I seem to remember that someone changing his adapter and his noise going away.