Static noise help please

Eddy - haven't experienced what I consider "static" from tubes but definitely a few random pops soon after start up that eventually turned into tube failure... an EL34 power tube.  Static to me is a more prolonged sound, sort of a rapid, lower volume crackling.  I'm wondering if it could be due to a dirty or loose connection that got "fixed" when you changed out gear.  Have you returned the ARC gear to service and is the static noise still gone?  Good luck.  

ghosthouse, Thank you for you responded.  The static noise is still there.  Windows were opened so I couldn't hear static at that time but after all windows closed I heard static noise again.  Did some search on Schitt Modi and found some people having the same problem.  Yes, it is low volume cracking noise and continue making same noise until I unplug usb cable.  Will not hear static noise when I play the music.   I will have to check with my Cary SLI80 again if it make noise like ARC to make sure.  This Modi is only $150, it might be too cheap that's why I having this problem.  I was going to spend $1,200-1,500 on DAC but something came up and need to use those money so I just pickup the Modi for temporary for couple of months and now I am afraid to buy Schiit Gungnir Multibit, might try different brand.  

Hello again Eddy.  I use a Macbook Air into a Gungnir via USB but it isn't connected directly.  In between there is a V-Link USB/SPDIF converter.  The Gungnir does not have a USB input.  No noise.  Things are very quiet.  You might try calling or emailing Schiit to see what they think the source of the noise might be.  Or, maybe consider an Audioquest Jitterbug.  They are supposed to clean up the USB/audio signal from a computer...only $50. The other thing i did on my system was get a split USB cable...one leg for signal one leg for power.  Both legs have A type USB connectors and are joined at a single common B connector that goes into the V-Link (or, in your case would go into the Modi, I'm guessing).  There is a V-Link on A'gon for $110 if you want to try that.    

Hello ghosthouse,  This guy on Computer Audiophile had similar problem and use something similar to Audioquest Jitterbug and solved his problem.  Here is the link, the last posted shown what he used,  http://www.computeraudiophile.com/f6-dac-digital-analog-conversion/noisy-schiit-modi-help-needed-oth...
What do you think about Audioquest Jitterbug and the one that he used here
 https://electronics-shop.dk/galvanically_usb_isolation.htm?currency=EUR

The guy at Schiit told me to try certified USB 2.0 under 2 meters.  And I don't think this is the problem because I did with 4 feet USB and still got static but will go out and buy certified one to try out today if I can find one, mostly have to order online.   

"The Gungnir does not have a USB input." ghosthouse, I'm listening to my Gungnir Multibit via USB right now as I type. It certainly has USB input. 

Eddy, agree to try a certified USB cable. If ordering online check out Blue Jean cables on amazon or their own website, very affordable and reliable source for ethernet, usb etc. 

The galvanic isolator would probably help, but for your temporary setup, not worth investment. Wires are all antennae. Experiment with physical layout of the computer, dac, etc. Minimize wires touching each other and when they have to cross, try to keep at right angles. Bundle extra length with plastic ties or twisties from grocery store(not as good because there is metal inside). Neat cables minimize noise. Cheers,
Spencer