Hum/Buz fro JC1

Thanks for all response. First the system is connected to a dedicated circuit and the pream is Supratek Syrah (tubes). I am not sure it may be possible ics. I disconnect the powercord of the pre but still hear the noise. I then unplug the ics between pre and am. As the result the noise disappears. Any ideas?

thanks.

The pre is connected to PS audio Dac. I had disconnected the ground wire on the power cord of the pre but the problem is till there. Downunder and Seadogs1, can you explain to me how to do it.

Thanks

Audpgile, there is no tv near by. there is one cable jack right behind the componet rack but the cable jack does not connect to anything. Audphile1 what do you recommend me to do with this cable jack?

Downunder, i did the same thing with 3 prong female by disconnect the ground wire so which means that there is no ground feeding the amp.