Is this pre-amp new? Do you have a VCR pluged into the same outlet? Also try lifting all ground except the pre and let me know what happens. Simply Music
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Simply_music- The preamp is new. I disconnected everything from the outlet and all other outlets on the circuit and still got the hum. I replaced the classe w/ first an Adcom preamp and then an A/V preamp/processor and got no hum with either. This preamp has a separate power supply. I wonder if it could be a problem w/ either the A/C cord or the power line from power supply to preamp?
Ignatz. The easiest way to do that is just go to your walmart, k-mart or home depot and buy a cheap plug-in multi plug for about $3.00 and take a pliers and break the ground on it and plug the unit you want to lift into it but may I suggest that you lift the amp first and if no improvement then the pre but not both and if that works just get a power cord and cut the ground. Now this is all assuming that the noise is there even with the volume is down and in both channels, right? I am a Class A dealer here, you can drop me an e-mail if you would like and if the problem persists and if your dealer can't help.