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Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ.

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A qualifier

Posted by Victor Khomenko on June 12, 2001 at 07:52:30:
The often mentioned mu-metal is in MOST cases NOT the best material for the power transformer. While it works exceptionally well in shielding the receivers (things like the CRT, or the microphone transformer), where fields are low, it usually saturates very quickly (due to its high mu) in the strong fields usually found next to the power transformer cores.
As result, its efficiency drops like a brick to virtually zero, and the "proper" and cheaper soft iron sield is far, far more effective.
There are various alloys that are positioned between theh traditional mu-metal and soft steel (things like Conetic), but their makers will also warn you about the saturation problems as well, so they need to be tried in every case.
So as a rule - use mu-metal for the sensitive components, use soft steel for power transformers.
Also, don't forget a very cheap and effective solution - a short copper turn around the transformer, easy to add and works like a charm.