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.
It's equally possible that by removing and replacing the tube, in your scenario, you improved contact at one or another tube pins, thereby curing hum that had nothing to do with the tube itself.
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