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.

try cheater plugs on the amps to see if the hum thru the speakers stops

Houstoneef, what components do you have connected to your preamp? Try disconnecting one component at a time from the preamp and see if the buzz goes away. If it does that's your problem. To fix the problem get a ground eliminator and inset in circuit between the preamp and the IC connected to the problem component.

houstonreef, I had the same exact strange behavior with my A21/P3 setup. I could never figure out what the issue was. I know this does not help but I eventually got rid of my Halo gear. I wonder if this is some sort of design issue with the Halo products?

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