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The right bottom screw of on the top face of the amp may have some grounding issues which makes the amp sensitive to the power socket you are using. If there are other devices sharing the same socket (aka power strip), a high volume hum can be heard. The hum disappears if you touch the screw and the front panel together. So if your workplace has limited number of wall socket and you have to use power strip, reconsider buying this. What I did is to buy a long extension cord to plug the amp to a wall socket far away.
Hmmm... After switching to another socket for some time, there is hum appearing in the left channel. Disconnecting DAC and running with only power cord is of no use. If I switch the tubes (Left and Right), the hum still appears in the left channel. Any idea or suggestion?