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?
I have no idea if it has an AC filiment supply. It has a wall wart power supply. Once it starts humming, it gradually gets louder and I have to unplug it to stop.
Yes, the ground wire is secure. I have tried grounding it a few different ways with the same result. Like I said, it sounds fine for about 30 minutes, then the humming gradually becomes louder the longer it plays, or even not playing.
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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