The J-Core 2 was exactly what my American Original Jazz Bass needed. Along with upgrading to Fralin split jazz noise canceling pickups, the core gives me the output boost I needed over the stock fender set. The EQ is very smooth and musical. The tone control itself is a beast. In most cases I can run bass and treble flat and just adjust the tone control. When I need a treble or bass boost/cut, the moves are usually subtle. Can’t say enough about it. I’ll probably replace my stock fender player plus preamp with J-Core 4. Love it.

I installed this on a Lakeland DJ5 Skyline. The improvement in tone is phenomenal. The single coils are the originals that came factory installed on the bass. They sounded decent but left me wanting. I was looking to replace the pickups but decided to try this route first. Glad I did. Of course, the single coils are now dead quiet (the noise was getting to me), but moreover the tone is now rich, punchy, deep and full. It's awesome to have both tone control and stacked treble and bass. The neck pickup is full on in P territory with tone rolled back and using both with a slight favor to the bridge gives me the punchy openness that I love on a Jazz bass. Bridge pickup soloed cuts the mix extremely well and has the growl and bite that was missing before. I'm not sure if I'll upgrade the pups now or not. Loving this tone.

Couple of things- the Lakeland Jazz plate is not same as Fender, so until I drill the original plate to accept the mini switch, it's a little funky on the install. This is purely cosmetic as the alignment is slightly off.

Be careful attaching the pickup hot and ground leads. I errantly had a ground installed into a 9V attachment meant for jumping active pups. I contacted FBT and talked with Max (promptly returned my call) prior to talking with Max I found my error and everything was golden. If you do make this wiring error you'll get scratchy pot sounds in the blend knob and a static pop when toggling on and off the active circuitry.

FBT is my go to site for bass pickups, harnesses and preamps. The guys are outstanding on customer service support. Thank you!

I purchased the Flexcore Mike Pope pre amp a few years ago for My used Fodera bass. It’s fantastic! So when I saw they were doing one for the J Bass I was on Board.
I purchase the Trickfish 2 Band J Bass preamp. Installed it in my Frankistien j bass. Instant improvement in the sound I was looking for, although I miss the midrange tone control that the flexcote has.
Overall I would recommend this preamp as it requires no cutting or modifying my bass. I’m not a lurthier, but even O’l thumbs Jodie installed it without a problem. The biggest thing though is the people at Fat Bass Tone. They sell the best products, are extremely well informed on install, and advise before you make stupid decisions. I am purchasing from them from now on. They will insist your happy with all purchases.

Regards Jodie Hill bassist

Absolutely the best upgrade for a jazz bass . Unbelievable how awesome this preamp is . The highest quality and Super easy install as well. Put this in my Fender Custom shop 66’ Jazz bass keeps the passive tone i love and then ive got the clean punchy tone of the Trickfish magic !

Instantly improved my tone. The five minute install couldn't have been easier. Thanks