First of all, you will need a soldering iron, solder and flux. It also helps trememdously if you have an extra set of hands to help hold everything together while you do the soldering. The biggest part of the job is not actually the soldering, but fitting the bridge to the fiddle. If you haven't done this before, I strongly recommend that you let a professional do this. Since the pickup is embedded in the bridge, if you mess up the bridge, you are done. My instructions here are going to focus on the soldering part of the job.
Make sure that you do the soldering part away from the fiddle. You don't want to accidentally drop hot solder on the instrument!
Start by putting the "cap" from the 1/4" jack onto the wire. Make sure the threads are facing towards the jack and away from the bridge.
Take a look at the three metal prongs that are sticking up from the jack. They are three different heights. You will not be using the middle one for this regular installation. It will look like there is only one wire that comes out from the bridge. It is a single wire in the center covered by a plastic shield, and then that is covered with a fine, metal braiding. You will start by soldering the metal braiding to the largest and tallest of the prongs. Be sure to use flux and only a small amount of solder. You will then solder the single, center wire to the shortest prong. Make sure that all of your soldering is done on the INSIDE of the three prongs. Any wires or solder that are on the outside of the prongs will cause the cap not to fit back onto the jack.The following picture shows how there is no solder or wires on the outside of the prongs.
When you are done with all the soldering, you can install the bridge with the wire facing the tailpiece. Install the jack on the same side as the chinrest. Screw the cap back onto the jack. It may look like the cap is not screwed on all the way because there are more threads on the jack than are on the cap.
You are now done and can plug the jack directly into your amplifier and check it out!







