Yamaha TRBX174 with Hot Stack Noiseless Jazz Pickup

Discussion in 'Pickups & Electronics [BG]' started by Jefro, Sep 22, 2022.

  1. Jefro


    Sep 21, 2022
    I've had this budget Yamaha bass for about 11 years, and am very impressed with the quality of the build, the neck and the Candy Apple Red metalflake finish.
    The Yamaha TRBX174 is highly rated among the budget basses when they are reviewed online.
    The P and J pickups sound very good, beefy and rich, and even the J pickup sounds pretty fat (most sound kinda thin).
    My only gripe is the single coil J pickup hum that is distracting in the studio and on stage.

    So I decided to replace the noisy J pickup with the Seymour Duncan Hot Stack Noiseless J Pickup, STK-J2B in the Bridge location.
    A humbucker noiseless replacement was a must, and the Hot Jazz Stack has more output than the other Jazz Stack model with the more traditional tone.
    In prep for the replacement, I had already leveled, crowned and polished the frets and set the action low for my lighter touch.
    And I had done a lot of soldering in the past on my motorcycle projects, so was very comfortable opening up the control cavity.

    I spent a lot of time examining the wiring diagrams posted with the various J pickups on the SD home pages, and took a lot of before photos of the controls.
    The Hot Jazz Stack was a perfect fit in the existing cavity with no grinding or sanding necessary.
    I used a pencil soldering iron to reach into the control cavity, and did not have to remove any pots, just tape some of the the loose wires out of the way.
    I wired it just like the diagrams, tightened up the strings, and was expecting good things, but it sounded like crap, thin and weak. ***???

    I reexamined my soldering, checked everything twice, and then consulted the actual information diagram that came with the instruction sheet for the new pickup.
    There in tiny print, off to the side, in a small box, was a message saying something extremely important....
    So, Green wire to the pot, then the Black and Bare wires to ground on the back of the pot.
    This critical info is no where to be found on the Seymour Duncan site.
    Seymour would not be happy, and neither was I having to re-wire the new J pickup.

    I unsoldered the pickup, moved a few wires around, shrink wrapped the Black and Bare wires together, and soldered them in place.
    The new Hot Jazz was a very good match for the Yamaha P pickup.
    I set the J a bit closer to the strings, and lowered the P pickup just a tiny bit to get the volume outputs closer together.
    This STK-J2 Bridge is a great replacement for any 2 pickup PJ bass that is similar to the Yamaha174.
    I highly recommend this noiseless J pickup for noisy hum problems and great tone.

    20211103_162905 (Medium).jpg 20220915_141120 (Medium).jpg 20220920_202559 (Medium).jpg 20220920_203133 (Medium).jpg TRBX 174 PJ bass wiring 05 (Medium).jpg TRBX 174 SD Hot Jazz Pickup diagram (Medium)2.jpg