I'm trying to install a new input jack to go with my bass guitars 18v tonepump preamp & emg p/j pickups (taken out a euro spector). I've included pictures; the old jack is the one on the right, and the new one is on the left. There are three points of contact, and I was sure that I had created a for firm solder joint between the three points, but whatever reason, the pickups/preamp come through extremely quiet when plugged into an amp, if it all. I'm new to this process, and I still have a lot to learn: Is there a reason why the new one isn't working? Maybe it's only made to work with passive basses or something? How would I tell?