Construction
The construction of a Tri-Sonic pickup is extremely simple. The coil is not held in a rigid shape on a bobbin, as in most guitar pickups, but simply squashed into an oval shape and fitted around the three magnets, joined end-to-end by their magnetic attraction, and placed onto the flat metal base. A simple cover is attached which fits over flanges running either side of the base. There are six holes in the pickup cover, through which can be seen a piece of black plastic which is glued to the inside. These are simply for appearance, not being any kind of pole piece.
As a result of the higgledy-piggledy chaos of directions in which the coil wires point, the Tri-Sonic produces a richer harmonic content than any pickup wound in a more standard manner. However, due to the looseness of the coil's linkage with the guitar body, Tri-Sonics are microphonic and can produce unwanted feedback. This can be eliminated by potting.
Read more about this topic: Burns Tri-Sonic
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