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JM ultra wiring! Want out-of-phase+series. How?

Posted: Thu Nov 07, 2019 4:41 pm
by WilburBufferson
Hi friends. I have been hanging out at TDPRI for 10 years now, but now that my guitars are mostly offsets, I have a feeling I will be spending more time here!

I have a CP 60th Anniversary JM. I've already modded it to do the "dual dial-a-tap" thing with Ken Rose humbuckers: The upper switch turns the rollers into coil taps. Well, I find the tapped sounds to be too thin and not very useful. Having seen the tricks that the newly released JM Ultra can do, I am wondering if anyone can point me to a wiring diagram to do the following:

Upper switch puts pickups out of phase AND in series (I don't think I will use the out-of-phase+parallel option that much, and don't want to install another switch to flip between series/parallel). The rollers can function as volume pots, like the ultra. Is this possible? I've seen drawings for 2V and 2T, but nothing in the JM format.

Oh, here's my JM. I love it to death!
https://photos.app.goo.gl/acZh2x4EeP4xMxDS9

Re: JM ultra wiring! Want out-of-phase+series. How?

Posted: Thu Nov 07, 2019 7:45 pm
by timtam
OOP requires all of the existing DPDT slide switch pins. Like on the Am Pro Jaguar (which is functionally the closest thing to the ultra JM, switching-functions-wise), which flips the phase on the bridge pickup.
https://www.fmicassets.com/Damroot/Orig ... 7-2016.pdf

So you would usually need a separate switch for series-parallel (which probably makes more sense, ie keep them separate ... like on the ultra where the S-1 does series/parallel). But there are 4PDT slide switches if you really want them together ... that may or may not fit in the space available.

Combine mods 22 (S/P) and 23 (OOP) here ...
https://guitar.com/guides/diy-workshop/ ... t-guitars/

I haven't thought much about how the ultra puts the two rollers into the OOP circuit (only .. as seems to be the case) as independent pickup volumes. I doubt it's something I would use myself .. so I'll probably wait for the official wiring diagram to appear to figure that out. ;)

Re: JM ultra wiring! Want out-of-phase+series. How?

Posted: Thu Nov 07, 2019 8:23 pm
by WilburBufferson
Hey! Thanks for the reply! I've consulted the sources you quoted (thanks for the links). I actually was on an online chat with Fender this eve. They said that they will probably make the wiring diagram available a few months from now. I will continue doing some research in the meantime. :wtf:

Re: JM ultra wiring! Want out-of-phase+series. How?

Posted: Fri Nov 08, 2019 9:20 am
by WilburBufferson
Bumping for expertise.