The two coils are very different to each other, being wound with different size wire and vastly different turns count (unlike regular stacks which have similar coils) but each generates the same noise voltage and therefore cancell noise perfectly. The lower noise sensing coil has less than half the number of turns and less than 1/3rd the resistance of the string sensing upper coil, reducing it's undesirable affect on the sound to almost zero. Here the bobbins have been assembled, the wires terminated and it has been vacuum wax potted at 120 degrees C.
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