I modified my new Squier Vintage Modified Jazz 70's bass. So I guess it's a Modified Vintage Modified (oh brother!). I needed a two channel setup where each pickup has it's own output jack. It's part of an
http://www.talkbass.com/forum/f36/experimental-fully-modular-bass-rig-902681/ setup that I'm doing. It ended up being so easy to do, so inexpensive, and so darned successful -- so here it is.
I started with this brand new Squier Vintage Modified Jazz 70's Bass.
I bought this bass specifically for this project knowing full well that I was going to modify it. I picked it up about three weeks ago.
A few days ago I completed the installation of the full-length thumbrest. It's a piece of 1/2" aluminum angle that I installed across the entire length of the playing field, with that thing I have an even reference spanning both extremes of the playing area. It may look odd but it friggin WORKS! It's just a set up experiment for something more elegant later on. My thumb just glides along it's length when I fingerplay to give me the sound I like. It also works for using a pick, my wrist just sorta slides along the length and gives me a perfectly even reference distance no matter where I decide to pick the strings. I can get a super even sound when going from string to string by moving my picking/plucking position to given areas - it really makes life easier. I scribed a line on the pickguard with a cargo knife, then removed the pickguard and completed the cut by scribing that same line over and over with the cargo knife until the unwanted section just came off. Nice straight cut that's nearly dead-flush with the edge of the aluminum. There is less than 1mm gap between the thumbrest and the pcikguard. The only "aw shyte" is the visible screwhole in the wood from the piece of the pickguard that was removed. I only had to drill one hole, I ended up using one of the pickguard holes on the neck-end of the thumbrest. It only needs two screws to anchor it. This thing really works!
After getting the thumbrest project done, and playing it for a few days to get used to it like that, I began the 2-channel modifications. I removed the control plate and found typical *low-cost electric guitar wiring* inside. It was your average ~done quickly~ wiring job in an economy-priced bass. Some of the factory soldering joints actually just broke off while I was fiddling with the wiring (cold/hasty soldering joints). So it all needed to be resoldered anyhow.
For the electrical mods, first I removed the stock tone control. I also removed the stock output jack and replaced it with a high quality Switchcraft #11. That one was connected to the Bridge pickup's volume control. I added a Switchcraft #12A for the Neck pickup's output and connected it to the neck pickup's volume control and placed it where the tone control used to be. I had to ream out both holes to accept the slightly larger barrel diamter of the Switchcraft jacks. That was easy to do with a handheld "T" reamer. The Neck pickup jack is a "normally closed switching jack" that has a switching terminal. I connected the switched terminal to the bridge pickup jack's Tip terminal (purple wire)
What this setup provides is double functionality. If I want 2-channel operation, I insert a cord into each jack. But if I want to use only one cord and still have both pickups available (just like stock) I insert only one cord into the Bridge pickup's jack. Since the two jacks are connected together via the switched terminal on the neck's jack both pickup's signals are available at the Bridge jack as long as no cord in inserted in the neck's jack. As soon as a second cord is inserted into the neck's jack, that connection between the two is broken (the normally closed connection is opened) and the jacks (and pickups) become fully independent.
So I can have it both ways ... single channel (exactly like stock) by using only the bridge pickup's jack, or 2-channel by simply inserting cords into both jacks. In single channel operation both pickups signals come out of the bridge pickup's jack. In 2 channel operation each pickup's signal is sent out it's own jack. Cool, right?
Yea, I could have used a "stereo" jack but that would mean using a special "stereo" cord, and then making some sort of special splitter box or "Y" cord adaptor. Totally not worth it. This way is easier, and is easier to apply to sending each pickup to it's own destination. On the finished Race Bass I'm building from this prototype, I may end up using an XLR connector, it depends on how I end up making the off-bass preamp section. But for prototyping out the design, two cords made a lot more sense.
For the two new Switchcraft jacks, I used thick stainless steel flat washers on top of the control plate, stainless steel inside-star lock washers underneathe the plate, and used Blue Loctite (#242) on the jacks' threads before torque-ing them down good and tight.
Ok, all done .... and it works PERFECTLY. In fact since I replaced the all of the wiring, resoldered everything, added actual ground wiring (that bare copper wire that runs full length connecting all of the components' grounds together with a single wire), used high quality jacks, and removed the tone cap and tone control, this bass sounds better (to me). Clearer, more detail. And the jack switching logic works perfectly, just like I had planned it out.
Here's what was removed....
And here's the end result .....
It works far better than I had hoped. Even without connecting it up to any of the panning/fading setup in my experimental rig made with modular synthesizer components (see that thread I linked up at the top of this post). I just started to experiment with it a little bit using the Line-6 M13 and the results were stellar, it sounds great. I used the bridge pickup as the "FX" chain and the neck pickup as the "clean chain". I was able to use the volume knobs like a wet/dry mixer. I tried phasers, flangers, overdrives, EQs, distortions, wild combinations of up to FOUR FX all connected to just the bridge pickup's output while leaving the neck pickup clean and dry. It's so cool that way! I connected the two chains to a two-channel mixer and fed that to my bass amp (details in that thread linked above). The levels were set evenly so all of the mixing was done right at the bass while playing. Friggin Mondo Cooly!!
And using the single jack/single channel method worked perfectly as well. Both pickups' signals came out of the bridge's jack with full volume control available if I just didn't insert a cord into the neck pickup's jack. The volume controls worked just like stock in that mode as well.
So it's going well. The funky big thumbrest is getting me to learn exactly how much thumbrest I'll actually need. And the 2-channel set up is Thuh Bawlz. The doors that got "kicked wide open" by this set up will lead me to many different ideas. Once I get a few more things figured out I can start working up the actual end-result Race Bass that I'll be building next year. This one is my prototype "proof of concept" bass that is allowing me to work out some new ideas.
Man that 2-channel set up is just mondo cooly.