Well; let me ask; you must have the pre-amp connected to a amp in there somewhere. Can you tell us what that is and how it is connected. See; if you have isolated the pre-amp and that is not the cause; you've isolated the turntable and you say that is not the cause then we know this; the pre-amp has no problem internally since it works independent of your existing system. The turntable motor is not affecting the cartridge causing hum. The turntable you say worked with another system so that is good internally. This leaves only the possibility of an external connection problem. Either in the wiring between components or in the grounding scheme coming off the wall. If the pre-amp has a three pronged plug and the turntable has a three pronged plug and the amp also; all going into the house outlet; thats your problem, then you need to float one of the components with a three to two prong adapter because you are creating a ground loop.
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