Hum problem solved
A. Joseph Ross
Sun Apr 13 16:27:32 EDT 2008
On 13 Apr 2008 at 7:47, Dan.Strassberg wrote:
> If there is a green pigtail ground wire on the outlet strip's power
> cord and the pigtail wire has a spade lug on the end that you are
> supposed to place under the head of the screw that secures the cover
> plate to the wall outlet, the spade lug might have been touching the
> head of the screw. To do an effective job of reducing hum in audio
> equipment, the pigtail wire doesn't have to carry much current--maybe
> only microamperes. As a result, if the lug had merely been touching
> the screw head, it could have been sufficient for hum reduction--until
> something ever so slightly disturbed the ground wire's position.
> That's all it would take.
Good point. But (1) the head of the screw is fairly well covered
with paint to match the color of the cover plate; and (2) the wire
lug was nowhere near the screw. So there must be some other reason
why the system worked previously. But since it's working now, that's
only a matter of idle curiosity, not a problem I need to solve.
A. Joseph Ross, J.D. 617.367.0468
92 State Street, Suite 700 Fax 617.507.7856
Boston, MA 02109-2004 http://www.attorneyross.com
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