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A microphonic pickup can plague the player, builder and repairman. It produces an uncontrollable, unmusical high-pitched squeal that makes the instrument impossible to play at stage volume. The culprit is a loose component in the pickup. Either the coil windings were improperly potted (waxed), or age and abuse have loosened the windings or some other part of the pickup. For example, a common problem with Telecaster® bridge pickups arises when the metal base loosens and vibrates under the polepieces.
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