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What might be nice is partial coil split. This involves the use of either a capacitor or a resistor between the split mode switch and ground. (I need to see photographs of the Quick Connect PCB to deduce where the resistors could be added non-destructively.)
IMO, what would be great fun with the standard controls is Seymour Duncan P-Rails pickups wired so that splitting them engages P90 mode.
Google PRS DGT and it will give you an idea of partial coil tap options/wiring - If you just have the one tone pot then you can wire both pick-ups to this push/pull switch option - something like 1.1 K resistor on the neck pick up and 2.2K for the bridge as you can wire one pick-up on one side of the 6 'tags' and the other pick up on the other side
Partial tap gives a far better single coil tone than just split the 'old way'
Lots of food for thought.
I’ve got a short shaft push pull pot which will fit in the cavity nicely, the p-rails option sounds interesting.
The simplest approach is to split both P-Rails simultaneously. IIRC, this involves using the green conductors as hot. Red/white form the series and split connection. Black and bare are permanently grounded.
My preference is for the hotter SHPR-2 in the bridge/Treble position.
The Triple Shot mounting surrounds offer four possible sounds per pickup. As time passes, I use two of those so infrequently that they might as well not be there. Parallel coils mode is only occasionally useful. The Rail coil is shite.
YMMV
If both pots were push pull would it be possible to use the tone pot for phase reversal and the volume pot for series/parallel?
Edit: At least I don't think you can... maybe someone smarter than me can explain what's going on here:
https://www.seymourduncan.com/images/wiring-diagrams/2H_3G_1VppSP_1TppPH.jpg
330pf gave me a brighter tone at lower volume (much like a coil split does) but full fatness at full volume with my pair of 490s. Just an idea if it suits your playing style.
I’m guessing the two red and white wires taped together cant be utilised for anything?
But @Cols, I see what you're saying, each individual pickup stays in normal (series) wiring, this is putting the two pickups together in series or parallel with each other. I can't imagine two HBs in series being a particularly desirable sound - although series, out of phase might be interesting.
For series/parallel wiring of each pickup, I think you would need two separate push-pulls or mini-switches, as I thought originally.
Series and out-of-phase will produce a honky tone. This might suit the occasional foray into scratchy Brian May Red Special sounds.
These are the north end of one coil and south end of the other in the humbucker. Taped together, one coil feeds into the other - series.
If you separated these, you could do a coil split or series/parallel switching.
You could also put the humbucker out of phase with itself, but I really wouldn’t recommend this. The result would be a very weak and thin tone.