Granite Audio makes a device called the Ground Zero that should solve the problem. It's a bit pricey but comes with a 30 day trial.
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Sounds like the problem is ground related. I had the same problem with my Krell KSA 250.
1. If your Preamp is a 2 prong plug style, plug the Preamp and the Amp into different circuits.
2. If the Preamp is a 3 prong use the cheater on the Preamp only leave the Amp with its 3 Prong in tact. Still try different circuits for each.
3.If your Amp has balanced and RCA input and you are using the RCA make sure that the copper jumpers have been inserted into the Balanced inputs.
4.Most hum comes from Video sources try unplugging any RF or Video inputs to your Preamp to see if the hum disapears.
if you have a cable tv, this may be a cause, as mentioned in the posts above. I had the same problem. To find if the cable tv is the cause of this problem, you need to disconnect the coax cable that runs into your house at it first point of entry, not from the cable box to tv, but before the cable box(if you have a splitter) or disconnect it from the input of the cable box. Unplugging the cable box from the wall will not to a thing. You need to disconnect the coax cable. Then turn on you system and see if you still get hum. If it's gone then you need Mondial Magic Box. Coax cable plugs into this device then second piece of coax cable runs from the Magic Box to the cable box. This thing's about $100 at music direct. Works like magic. http://www.amusicdirect.com/products/detail.asp?sku=AMONDBOX