The pickups on the early Gibson basses of the 1960s remained unchanged for many years, undergoing only minor cosmetic modifications from time to time, but staying true to the originals’ sonic characteristics. The pickups in today’s Thunderbird IV—two vintage-style TB Plus humbuckers—both capture and recreate the classic attributes of those early Gibson basses. The TB plus humbuckers are traditional hum-cancelling bass pickups with ceramic magnets. They are wax potted then filled with epoxy, producing a full frequency, heavy-bottom sound similar to pickups with a passive EQ, and delivering the huge, powerful bass tone the Thunderbird IV is renowned for.