Theogenes
Headphoneus Supremus
- Joined
- Mar 28, 2010
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It wasn't just a tube. I have tried two other pairs of tubes. Same hum. Also, something bizarre had happened to one of my preferred pairs of tubes, but I am going to report that in the Schiit Lyr tube-rolling thread.
This might be a dumb suggestion, but have you ruled out ground-loop hum? Tried a cheater plug or a different outlet, maybe?