Hi Guys (if this is inappropriate for this circle, Mods please move).
I'm looking for help diagnosing a problem. Here it goes:
I have a non modded tube Dac.
There is a scratchy noise in one speaker only. It is worse when I first turn the DAC on, and can scratch and pop for 30-90 seconds. If I leave the Dac on for a day, the scratchiness almost disappears. It does not change with tube changes or cable changes or with adjusting any cables other than When I change RCA cables from Right to Left, it changes Speaker. It does not change when I change amps or speakers, so I know it is something inside the DAC. It is a rapid scratchy sound that lasts for 1-2 seconds and then stops. When I first turn it on, it also sounds a bit fuzzy, as if playing an LP and the needle has hit the edge of the recording, with just a low level hiss. The hiss and the acratchiness both disappate with time.
I am not an EE, but have decent skills....any thoughts?
Thanks in advance.