OK, so I have a FrankenPeavey project in the works. I have been sitting on a fully loaded, rosewood fingerboard T45 neck and a single good (and another weak) Super Ferrite for over a year. Seems like a waste of good parts, but couldn't get rid of them.
Well, found a loaded, black 87 Foundation project body (complete, with no pickups). It arrived, I cleaned it up, attached the neck, dropped in the SFs, strung and set it up and is great all around. Originally was going to just install the neck Super Ferrite and rock this thing like a pre-57/single coil P bass, but then found an older toaster T40 pickup, which is on the way, along with a pickup ring from Frets On The Net.
I have never mixed T40/45 pickups with Super Ferrites, can anyone else chime in on this? I tend to play on the neck pickup soloed or in a 50/50 blend with the bridge pickup. Seems that the T40 pickup has a similar output to a P pickup in series mode and a vintage J pickup in split mode. Since this is the older version, I gather that's is not quite as aggressive as the later blade version. The Super Ferrites seem just a touch hotter than a vintage wound J pickup, so I feel they will match up well. I'm going to have a push/pull pot do the split, as one of the original volume pots is pretty shot. If I run into phase or RW/RP hum cancel issues, I know of another Super Ferrite with the opposite polarity to my good one I could get, if so desired.
My primary decision is whether to rout the T40 pickup for bridge or neck position. I already have an Ibanez RB630 bass modded as a virtual T45 with a blade T40 pickup in the Precision sweet spot, so I am leaning towards the bridge location for the T40 pickup in this build, for variety.
If the T40 pickup is to be in the bridge position, I would rout out towards the neck, putting the rear coil in the current space reserved for the Super Ferrite-pretty much putting the coils in the 60s and 70s J locations. Would play with the wiring phase so the bridge side coil activates in single coil mode. This will have that J/MM look with a Meridian flair.
If in the neck position, I would rout out towards the bridge, with the front coil in the current SF rout-putting is right in the P sweet spot. Also would play with the wiring phase so the neck side coil activates in single coil mode. This would be an interesting P/J variant. A T/SF if you will...

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I welcome any opinions or experiences with pickup choice and location.