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Seymour Duncan TB-4 JB Trembucker Black — High-Output Bridge Humbucker for Tremolo Guitars

The Seymour Duncan TB-4 JB Trembucker Black is the F-spaced bridge-position version of the legendary JB Model humbucker, designed for guitars with a Floyd Rose-style tremolo or any wide-spaced hardtail bridge. The Trembucker is a high-output passive humbucker that brings the JB's signature upper-midrange bite, tight low end, and harmonically rich highs to instruments with 52.6 mm string spacing over the pickup. Built for everything from blues and country to the heaviest hard rock and metal, the TB-4 is the right drop-in upgrade for players who want their bridge pickup to push the amp harder and cut through any mix.

What Sets the TB-4 Trembucker Apart

Unlike a standard-spaced humbucker, the TB-4 Trembucker uses a wider 52.6 mm pole-piece layout so each string aligns precisely with a magnet on Floyd Rose and other F-spaced bridges. Inside, an Alnico 5 bar magnet and hot coil windings deliver the unmistakable upper-midrange attack that has made the JB Model a studio and stage standard for decades. The combination of a nickel silver bottom plate, vacuum wax potting, and a 4-conductor lead wire means the pickup stays quiet under high gain while supporting series, parallel, and split-coil wiring schemes.

Output and Magnet — The Voice of the JB Model

The JB Model's character comes from its hot coil windings and an Alnico 5 bar magnet, which together produce the aggressive mids and singing highs that define the pickup. The Trembucker variant measures 17.4 kOhms of DC resistance, putting it firmly in high-output territory and giving it the headroom to drive tube amps into natural overdrive.

• Magnet: Alnico 5 bar magnet — delivers the classic hot-rodded humbucker voice with strong treble detail and aggressive harmonics.
• DCR (Trembucker): 17.4 kOhms — high-output reading that pushes amps into saturated overdrive while retaining note definition.
• Type: Passive humbucker — no battery or preamp required, drops into standard 2-conductor or 4-conductor wiring.

Construction and Wiring — Built for the Stage

Hand built in Seymour Duncan's Santa Barbara, CA factory, the TB-4 Trembucker is engineered to survive heavy gigging and recording sessions. Vacuum wax potting eliminates microphonic squeal at high gain, while the nickel silver bottom plate keeps the magnetic circuit stable and the response consistent.

• Lead Wire: 4-conductor shielded cable — enables series, parallel, and split-coil wiring for tonal flexibility.
• Potting: Vacuum wax potted — prevents squealing under high-gain stage and studio use.
• Bottom Plate: Nickel silver — supports a stable magnetic circuit and consistent response across the string range.

Fit and Compatibility — Trembucker Spacing Explained

The Trembucker designation refers specifically to the 52.6 mm pole-piece spacing, which matches the string spread found on Floyd Rose, Edge, and other double-locking tremolo systems, as well as wide hardtail bridges. This makes the TB-4 the correct choice for Ibanez RG and S-series, Jackson Soloist and Kelly, Charvel San Dimas, and similar F-spaced guitars, while the standard-spaced SH-4 JB is the better fit for Gibson-style hardtail instruments.

• Pole-Piece Spacing: 52.6 mm (F-spaced) — aligns each string directly over a magnet on tremolo-equipped and wide hardtail guitars.
• Recommended Pot Value: 500 kOhm volume pot — preserves high-end cut and brightness; a 250 kOhm pot can be used for a softer, warmer response.
• Made In: United States (Santa Barbara, CA) — hand built in Seymour Duncan's own factory.