Well, I made a JB hybrid for my Gibson, and I love the result. I wound up keeping the screw coil and baseplate from the JB and using the slug coil, single thickness ceramic magnet, and shorter filister screws from a BKP Brute Force neck pickup. Those spec at 13.4k, so a bit lower than a JB coil but not light years apart.
Tonally it reminds me a bit of the "Seymourizer" but with a more open/complex high end. The "sweet spot" is wider. Attack and compression are exactly what I was looking for (more and less, respectively) - there's something about my favorite BKPs that makes it easier to get more saturation without having to fight for note definition, and this is doing that. It still has some of the JB sizzle that I love, but also more crunch. I was worried about having a sort of bland, overstated midrange because of the sound of the Brute Force pickups, but these particular coils complement each other well. Sounds great with the amp set flat, no weird humps or spikes to correct for.
Fans of deep clean sounds won't like this coil combo. It has that zingy gritty ceramic bridge pickup clean sound. Middle position with the Jazz Neck, though, that gives me a really cool, scooped, hi-fi clean that I could probably find a lot of spots for. Hot lead sounds on the bridge are not as smooth as the stock JB but still sing well enough, not too jangly.
I had to use electrical tape on the coil-to-lead connections and the bulk of the tape kept me from getting it tucked back in as nicely as I would have liked. The bobbins are also very slightly different heights and I wasn't able to fit a spacer, so the top of the slug coil is tilted ever so slightly out of level with the screw coil. I hope the tape doesn't pose a problem for long term durability. I can take it apart and redo it if needed, I guess.
I'll try and do some clips if anyone is interested. I just had the most fun playing this guitar after I finished up. All in all I couldn't be happier. It's finally not fighting me.
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I did record a couple riffs with the stock JB, and also the Distortion and the Rebel Yell in their respective guitars, and they sounded so very similar on the recording... and that made me think about the "pickups don't matter" video, the fact that amp and mic and placement and recording preamp are all the same, and that I was playing bland "pickup demo" riffs, when what really sets these pickups apart is how they respond when I'm actually playing the stuff I play, which is more complicated. Wish I had done more recording here before the surgery. Dumb blah riffs hide more than they reveal. But it also made me think about subtleties of feel, and how I know the sound I'm looking for, but some setups make me work harder to get there. Not surprising that it could sound pretty similar in a recording, but my playing will be more or less relaxed depending on how much work I have to do, which is not entirely conscious. With this pickup swap, I kept the same strings on the guitar, but when I was playing I felt like I'd gone a gauge or two lighter.
I've also been playing a Gibson with a Bare Knuckle bridge pickup through this one amp for about 16 years now, so that's very much what I'm used to. Hard ymmv caveat.