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

Just reflect

on how a toroidal transformer works. The magnetic field generated by the coils wound on the toroid forms a donut shaped pattern. The core material of the toroid captures some of that field from the primary windings and uses it for induction on the secondary windings.

That being said, there's a lot of that field that escapes outside of the windings. That external field then drops down through the center of the toroid. Any hold down bolt that offers high resistance to that field has the field actually generating work as an induced field is now being generated in that hold down bolt ( Faraday's, and Maxwell's laws).

Brass is significantly more conductive than steel so it offers a faster pathway for that induced field (drained to ground). You can gain even more by using Nylon hardware which is completely non conductive. Incidentally the large steel washer used to compress the toroid does not necessarily have to be changed: it actually will shrink the field some.

I have been advocating this for many years now, and it also works for speaker inductors also. A sense of hardness disappears and there is a greater sense of ease to the music. At various CES I have talked to transformer engineers about this phenomenon, but have been dismissed or ignored by most of them.

Stu



Edits: 04/16/12

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