Wow! How did you wire that? Seperate or all together? Do you have the impedance selector switch? I have two of those pups somewhere for a project that never happened. Have a Gibson Triumph pup too.
WARNING: LONGWINDED ANSWER WITH BACKGROUND INFO (and other rambling) --
The initial thought experiment happened because I'm not a fan of bridge pickups that are super close to the bridge. When this bass came into my possession back in 2014, it already had a pickup cavity routed in that extreme bridge position (for a Bartolini GB pickup, which now resides in my Hagstrom Swede bass). Anyway, for this same extreme-bridge-position-issue reason, I was really only using the North coil of the bridge pickup -- even though I had wired up a 4 way mode selector switch for each pickup, offering North, Series, Parallel, and South. That coil in combination with the South coil of the neck pickup has a fantastic, near-classic-dual-Bisonic Starfire tone. On a sidenote, I like ALL 4 settings when it comes to the neck pickup (solo'd or blended with the other pickup) and like to switch between them depending on the song we're playing. In any case, that big ol' space in the middle there, made me really want to do a little more experimenting, with a middle/bridge-ish position pickup.
I had two Casady pickups and one transformer&switch harness in the parts bin. Recently I feel like I optimized my Newport bass with the single black Casady pickup in the middle position, coupled with the JTEX Distiller filter preamp. It has enough boost on tap to not require the step-up transformer. Though it's not a huge signal, it makes up for the lack of BOOM, with amazing clarity and articulation. I think it will shine in the studio especially, but with a little bump of the pre-gain on the amp, it's a killer in a band setting too.
So that said, I was left with one Casady pickup and the transformer&switch harness! Those are now in this Starfire. I just replaced the bridge pickup's 4 way mode selector switch with a pan pot. This lets me blend between the Casady pickup and and the North coil of the bridge pickup.
THEN! There's a master 4 way selector which lets me combine the pan pot signal with whatever is coming out of the neck pickup's 4 way mode selector switch. The master switch offers the following:
- signal from 4 way neck mode switch
- signal from pan pot
- both in parallel
- both in series
The signal from the master switch then goes to the master volume control, which is further sculped by way of a 12-position varitone with separate contour control and the mini-toggle, which activates a super deep .1uF cap for a heavy dub reggae kind of tone.
It's a beast, but has the most versatile passive tone palette I've created thus far.
Mungi, regarding your pickups in the parts bin: if you're thinking about doing a 2-pickup bass with the Casady pickups, you will only need one transformer, but I found these pickups to not be ideal in the neck position (via my Newport bass experiment). The E string was noticeably weaker than the other 3. I even tried flipping it around, since in standard operation there's an additional off-center magnet underneath the higher strings for a boost in output, but even with that magnet underneath the E sounded a bit weak. So if I was going to do a dual Casady pickup bass, I'd go more in the direction of Fender Jazz bass pickup positions. I wonder how the Gibson Triumph pickup would work with the Casady pickup... since those had 3 separate leads to tap the pickup(if I remember correctly), unlike the Casady which just has one signal coming out of the pickup and 3 coming out of the transformer.