Bellari Hum

Wasn't this a problem with certain (read: older) versions of the Bellari? I believe it's a quick fix courtesy of Bellari and something that was taken care of in later versions. Perhaps someone here has more info, but I would definitely try contacting Bellari/Rolls. Good luck.

This is a very common problem, from what my dealer told me, and that it depends on how well isolated you have the Bellari, and other external factors.

I'm noticing that the hum comes and goes. There is no consistentcy here. It may happen for 5 minutes at a time, then I won't hear it for a good hour or so, then it will come back. Very frustrating.

i have been using the bellari and have been loving it. it was only when i got the grado gold that i noticed any hum.

I had this exact same problem for awhile. I lived with it for about a year but was recently prompted to investigate further.
I found a solution here-

http://www.audiokarma.org/forums/showthread.php?t=86591

"The preamp is fixed. I found that there was a ground loop between the case and the two screws that hold the circuit board to the case. So I removed the ground connection to the PC board near the power indicator LED and the hum stopped. Also I put a star washer between the top and bottom case to insure there is a good ground as the top was not grounding well to the bottom. IMHO the preamp sounds very clear and open."

I simply opened the unit and placed a small piece of electrical tape between the PCB and the place where the screw fixes it to the case nearest the LED. I then left that screw out, the other screw and the screw at the rear hold it all together well enough.
The hum is gone and I noticed an immense improvement in sound.