Schitt freya preamp hum- how do I get rid of this?

It is very likely it wont be as quiet in tube mode as in S.S.  

Dont take this wrong way guys, but none of us are any better than the best we have heard or have seen. So if you compare a Schiit Freya against a better sounding unit and design, you are not nearly as impressed. I stopped looking for giant killer products years ago but they simply dont exist. I also learned long ago that I am simply not capable of differentiating a poorly made from a well made product and then applying this build quality to sonic performance.

Noise problems are common on this preamp. In fact I refuse to retube them as my experience has been terrible with with this brand. In fact the only returns I got for over 2 years (with probably over 250 6SN7 pairs sold for other components during this time) both came from this preamp. A hum from a bad tube is kind of unusual in my experience and some of the noise problems I have had reported were unusual and not typical of N/M. To make matters worse, tubes often get noisy quickly. I hope you have good luck and fix the problem, but I felt I should share my experience as a tube seller. I wouldnt waste my time and if the next set of tubes doesnt fix this problem I would demand a new unit.

Well I cant say that there were no others failures just not immediate requests for returns for noise problems. After this rather unusual event I did a search to see if this seemed to be a trend and other customers had reported the same problems. Dont get me wrong I think these products represent a good value, but the types of noises being reported were unusual. In fact I kept track of the Schiit specific tubes, tested them again for noise/microphonics sold them and had no problems.