One thing you might want to check is for any DC getting into the
transformer. This can cause the transformer to saturate on one side
of the sinewave, leading to high peak currents and a buzz. You can
try checking for this by putting a DMM set to DC across the AC line.
Should be well under a volt.
Not positive, but I’d suspect resonant frequencies.. might be simple as using
flat washers under the mounting screws.. maybe try adding an inductive load to
skew the power factor.. gobs of information online.. good luck. db
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> On Jan 31, 2022, at 10:34 AM, drake.chamber...@re
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