How do you fix the loud buzz of a metal halide? I can deal with the low hum
of the 3 of my MHs, but the 4th has a loud buzz. Anything to do besides
purchasing a new ballast that can fix this problem. It is in an enclosure.
The ballast is from Hamilton Technology. All my ballast are from them, but
this one is the only one with a loud buzz. The ballasts are all at least 4
years old.

Is there anything I can tweak in the enclosure?

big D
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