Now I know the "original" patent talks about magnetic coupling. Let's remember that the purpose of a patent is to protect the market for a product and also confuse the hell out of the competition if possible. Or maybe Seth Lover just did not understand.
There is nothing wrong with making a hum bucker out of coils with Alnico cores. It will not sound the same, and as you wrote: eddy currents.
The sensing area of a hum bucker is not the area between the coils and slugs, but rather consists of two nearly separate areas over each. The part of the string not strongly magnetized in the direction so as to make a strong B field pointing through the coils contributes little.
Where does this idea for a side to side sensing area come from? It is just one of many myths.
Originally posted by Mark Hammer
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