A JB Neck Pickup… for Your Strat! Over the years, we've modded a ton of Strats at GearNuts, and while many Strats come routed for a humbucker at the bridge, fitting a full-sized humbucker at the neck can be a real pain. That's why we're so glad to offer this single-coil sized Seymour Duncan's JB Jr. SJBJ-1. It may be half the size of the original JB, but the SJBJ-1 delivers the tone of this hugely successful humbucker. What's more, its pole pieces are adjustable, allowing it to more closely emulate the magnetic field of a full-size humbucker along with controlling the string-to-string balance. While it’s not quite as hot as a Duncan Hot Rails model, the high-end response of the JB Jr. SJBJ-1 more than makes up for it. If you play a Strat and you want to toss a Duncan JB humbucker in the neck, the JB Jr.