| From the Gibson web site:
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.
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Clubs: Thunderbird #8,Gibson #39,Yamaha #19,Lakland Owners Group #23,U.S. Peavey #5,Short-Scale Six-String #3,Kala Ubass #3,Brice #6,G&L #57,Carvin #203
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