I have the same problem but I don't have tubes. I have tried many ways to get rid of this noise even a b-p-t power cleaner and no success. So I'm still working on it.
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Did a lot of experimenting, and found that I could eliminate 75% of the buzz by rerouting cables. There was a set of ICs touching and partly intersecting the path of a power cable. Lifting it in my hand reduced it quite a bit. As the rat's nest did not allow for too much tweaking there, I just moved components around.
There is still that 25% or so left. I will try more fiddling tonight.
Try that, Clydemetz!
I doubt this is your situation, but I was using my amp and DAC with a SS pre and it was dead silent. Switched to a tube pre and a similar noise appeared. Tried everything to no avail. Eventually found out that a connection inside of my amp was bad. It was fixed and the noise went away. For some reason, the problem only manifested itself with the tube pre and not the SS pre.
I actually didn't find it myself. I unhooked everything and slowly put pieces back together and narrowed it down to my DAC and/or amp. I sent my DAC in for a check-up first. It checked out fine, so I sent my amp in for a check-up and that's when the loose (or broken?) connection was found.
I'm not sure if the SS pre actually blocked the interaction between the DAC and amp (it seems to have done so), or maybe the amp's connection coincidentally got worse when I hooked up the tube pre?? Either way, I never had the hum problem until I hooked up the tube pre...eventhough the tube pre had nothing to do with the problem at all. It was incredibly frustrating and it went on for months. Listening at night was almost impossible. I was very happy when it was all over and I had beautiful silence again.
This all happened about 18 months ago. I can't remember if the symptoms changed when I fiddled with power cords and interconnects like yours do, so I can't say if the problem is really the same or not. Good luck!