Where do you hear this buzz? The buzz is the 60Hz AC I'm sure. You will hear it with amps with regulated supply when the toroid is not isolated well. It's the magnetic field causing AC current signal. Of couse if you hear it from phones it's probably the ground is not grounded well, but I've only picked this noise up with sensitive phones and the HE-6 is pretty stable since I believe this noise is well below what HE-t will pick up.
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