I have a inexpensive Bellari phonostage that sounds pretty good after a 15 minute warmup, but develops a terrific hum after about 30 minutes. It has one tube. Anyone have an idea?
No quiz. It has been back in the box for a couple years. I keep looking at it wondering what's wrong. Thought maybe I could get some help as I am no tube genius. Maybe I will give it away and let it drive someone else crazy.
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