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In Reply to: RE: Tripplite Isolator mechanical noise posted by Duster on January 02, 2016 at 13:18:11
One way to reduce noise from this source is to remove any steel upper top which is close to the transformer. On occasions I had simply cut a circular hole or replace the top with an aluminium shield.
Isolating the transformer mechanically rarely works.
In 50Hz countries, US made transformers are often poor whilst Japanese source ones are almost always fine. It is down to the design.
Follow Ups:
It could be from DC on the line. DC causes transformers to mechanically hum.
A vanAlstine hum dinger will solve this problem. I use one before a 60lb toroid and it eliminates what slight hum it was making.
Edits: 02/10/16
I know some people who sand filled the enclosure of their balanced transformers! Noise killed!
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