Have you tried floating the ground?
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I recommend purchasing a par of RCA test adapters from Jensen Transformers and performing the troubleshooting steps per Jensen's instructions.
Doing so will identify where the problem lies. Jensen's troubleshooting guide offers several options to fix the problem.
Bob, How bad is the hum? Have you tried this preamp in another system to make sure it is ok?
Grounding is important. I know a guy that bounds a grounding rod into the ground outside of the listening room wherever he lives for a dedicated ground.
You can try star grounding at the preamp while floating the ground on all other components.
Different cables and their arrangement might help.