Description
If you love the JB but your Strat’s routing says otherwise, the JB Jr is the workaround Seymour Duncan built for exactly this problem. It’s a genuine twin-coil humbucker shrunk to single-coil dimensions, so it drops straight into a Stratocaster bridge slot without any cutting or extra pickguard fuss.
The rails-style design uses adjustable pole pieces instead of fixed bar magnets, which lets the pickup track your string spacing more accurately and mimic the magnetic spread of a full-size humbucker. That translates into a more even response across all six strings, rather than the uneven pull you sometimes get from compact humbuckers.
Tonally, it borrows the JB’s aggressive midrange but dials things back just enough to open up the top end – expect lively harmonics and a brighter, airier edge than you’d get from Hot Rails, along with slightly lower output. It still hits hard enough for heavy riffing, but cleans up nicely for blues work too.
- Single-coil-size humbucker (rails design) for Strat bridge position
- Adjustable pole pieces for fine-tuned string balance
- Four-conductor hookup cable included
- White cover
- USA Patent No. Des. 355,207
Also offered for neck/middle positions, and as part of a versatile three-pickup set pairing the JB Jr (bridge) with a Duckbucker (middle) and Little ’59 (neck).





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