Thanks for the rest of the storySince the OP hasn't post - (as Paul Harvey would say) here is the rest of the story...
The OP asked whether he could bring along his new CJ preamp (I don't remember what model, but it was pretty fancy). He set up the Lampi Pacific and we plugged it directly into the wall socket - not my isolation transformer - using a cheap AC cord. I had earlier done the same with my Lampi and it was dead quiet coming from the wall. We connected my computer and fancy FTA USB cable and 512 engineering RCA interconnects - and there was no noise, just great music. We switched to a cheap USB cable - still no noise. So it was pretty clear - the Lampi was not a problem. We took out the CJ preamp, and the OP said he had heard something moving around in the CJ when he was packing it up. So I suggested we take the top off before plugging anything in. We opened up the CJ and there was a big capacitor (one of many in the CJ) sitting loose, able to roll around in the case! We didn't want to plug it in with the loose capacitor, so we took it out and tried to determine where it belonged. Not sure, but it certainly was not supposed to be loose. The conclusion was that if he had not also packed up the CJ preamp, he probably would not have heard the loose capacitor moving around in the case and determined the problem. Tomorrow there will be call to CJ.
Larry
For one I'm glad that not the Pacific was the cause and secondly that you together where able to determine the real culprit and therefore a solution seems possible in the very near future