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New twelve string bass

Discussion in 'Luthier's Corner' started by Basvarken, Apr 16, 2021.


  1. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    I've completed the build of a new bass.
    The Brooks EXB-12-2PR (EXplorerBass - 12 string -2 pickups Reverse triplets).

    brooks-exb-12-2pr-full-1500_orig.jpg
    brooks-exb-12-2pr-1500_orig.jpg
    brooks-exb-12-2pr-back-full1500_orig.jpg
    brooks-exb-12-2pt-headstock-1500_orig.jpg
    brooks-exb-12-2pr-bridge1500_orig.jpg
    brooks-exb-12-2pr-diagonal-body1500_orig.jpg
    brooks-exb-12-2pr-headback1500_orig.jpg
    brooks-exb-12-2pr-close-upper-horn1500_orig.jpg
    brooks-exb-12-2pr-tailshot-1500_orig.jpg

    - Mahogany body
    - Laminated Mahogany set neck. Glued in
    - Black gloss finish
    - Checkerboard binding
    - Ebony fretboard
    - Brass position dots
    - Nickel silver frets
    - 34" scale
    - Buffalo horn nut
    - ETS twelve string brass bridge set. Gold plated
    - Two spokewheel double action trussrods
    - Carbon reinforcement strip in the neck
    - Lace Alumitone Bass Bar in the neck position
    - Lace Alumitone Bass Bar in the bridge position
    - Switchcraft output. Gold plated
    - 2 x Stacked volume/tone knob. Gold plated
    - Pickup selector switch. Gold plated
    - Gotoh GB 350 lightweight bass tuners. Gold plated
    - Gotoh Stealth ST 31 guitar tuners. Gold plated
    - d'Addario EXL 170 - 12 strings
    - Weight: 4.5 kg

    Electronics circuit by Bas Becu.

    I'll post pics of the build process in separate posts below
     
  2. SlingBlader

    SlingBlader

    Oct 19, 2013
    Gorgeous! I'd love to hear some sound clips. I have the same set of pickups set aside for a future 12 string build.

    Tell me about the binding. Did you assemble that, or were you able to source it already assembled like that? I have a project coming up that needs very similar binding.
     
    Basvarken and bholder like this.
  3. bholder

    bholder Affable Sociopath Supporting Member

    Sep 2, 2001
    Vestal, NY
    Received a gift from Sire* (see sig)
    Wow. Would love to hear it.
     
  4. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    Bought a nice pair of Mahogany blanks (its actually Khaya)
    Plus a pair of thinner Mahogany blanks for the top.

    Glued the body blanks together.
    And drilled holes for the control cavity first and then routed the control cavoty plus wire channel.

    After that I glued the top on.
    And routed the body shape

    two-blanks_orig.jpg
    two-blanks-for-the-top_orig.jpg
    two-blanks-for-the-body_orig.jpg
    two-piece-body-blank2_orig.jpg
    making-the-control-cavity_orig.jpg
    routed-control-cavity-plus-channel_orig.jpg
    routed-controls-cavity-body-blank_orig.jpg
    glueing-the-top-onto-the-body_orig.jpg
    routed-body-front_orig.jpg
    routed-control-cover-profile_orig.jpg
    routed-body-backside_orig.jpg
     
  5. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    Next was the ebony fretboard.
    Drilled holes for the position markers
    Made a custom one for the 12th position
    Hammered in the frets.

    And then I found out that the fret wouldn't seat properly. Turned out the fretboard had a long lengthwise split on the backside...

    Had to start all over gain with a completely new fretboard. It's all in the game I guess.

    drilling-position-maker-holes_orig.jpg
    glueing-the-dots-in_orig.jpg
    cutting-brass-ring_orig.jpg
    brass-ring-black-dot_orig.jpg
    brass-ring-black-dot_orig.jpg
    glueng-in-the-side-markers_orig.jpg
    sanded-16-22-radius_orig.jpg
    all-frets-hammered-in_orig.jpg

    The split...
    split-fretboard_orig.jpg
     
  6. tb4sbp

    tb4sbp

    May 9, 2017
    North East
    That is one beautiful bass
    Outstanding job, well done
     
    srayb and Basvarken like this.
  7. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    Next was the neck.
    Made a laminate neck blank of three parts mahogany with maple veneer in between

    neck-blank-laminate_orig.jpg

    routed the slots for the two spoke wheel truss rods.
    routing-trussrod-channels_orig.jpg
    test-fitting-the-trussrods_orig.jpg
    two-spoke-wheel-trussrods_orig.jpg

    And a smaller slot for the carbon reïnforcement strip in the middle
    trussrod-access_orig.jpg

    Sawed off the headstock angle.
    And shaved it flush
    cutting-headstock-angle_orig.jpg
    shaving-headstock-angle_orig.jpg
     
  8. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    Routed the channel for the checkboard binding.
    routing-binding-channel_orig.jpg
    routed-binding-channel-close-up_orig.jpg

    Bought strips of the checkerboard binding from Custominlay.com
    checkerboard-binding-p-us-gold-mop-dots_orig.jpg

    Glued them in
    glueing-the-checkered-biding_orig.jpg
    binding-halfway_orig.jpg

    And then routed the channel for the outer bindings.
    outer-channel-close-up_orig.jpg
    routed-the-channel-for-the-outer-binding_orig.jpg

    Pre-bent the white strip
    bending-the-white-purfling_orig.jpg

    And then glued the white strip and the outer black binding in place. Clamped it with inner bicycle tubes
    taped-and-clamped-the-binding_orig.jpg
     
    TerribleTim68, 4SG, toothguy and 4 others like this.
  9. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    The routing of the pickup holes got done somewhere between ;-)
    Drilled a hole for the output.

    black-and-white-binding_orig.jpg
    output-hole_orig.jpg
    squaring-the-corners_orig.jpg
    fitting-the-pickups_orig.jpg
    pickups-fit_orig.jpg

    Routed the neck pocket
    routing-the-neck-pocket_orig.jpg
    neck-pocket-ready_orig.jpg
     
  10. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    Glued the (new) fretboard onto the neck. Used the same inner bicycle tunes for clamping again

    clamping-the-fretboard-onto-the-neck_orig.jpg

    Shaped the neck profile.
    shaping-the-neck-profile_orig.jpg

    Cut the (rough) headstock shape
    headstock-shape-rough_orig.jpg

    Fine tuned it somewhat
    headstock-shape-refined_orig.jpg

    Drilled twelve tuner holes
    drilling-12-holes_orig.jpg


    Shaped the neck heel area
    wokring-the-heel_orig.jpg
    working-the-heel2_orig.jpg
    neck-heel-ready_orig.jpg

    Test fitted the neck into the pocket
    making-neck-joint-area_orig.jpg

    When the bridge set arrived from ETS Hardware (Germany) I could finally determine the exact angle
    ets-bridge-set_orig.jpg
    checking-the-angle_orig.jpg
    checking-the-angle2_orig.jpg
     
  11. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    after some test fitting and fine tuning the neck was a perfect fit

    [img[https://www.enkoo.nl/uploads/1/3/3/7/13376708/fitting-the-neck-getting-there_orig.jpeg[/img]
    fitting-the-neck_orig.jpg
    glueing-the-enck-in2_orig.jpg
    glueing-the-neck-in_orig.jpg

    When the neck was set I cold start the finishing process.

    First did some pore filling. Git no pics of that. Too boring...

    The painted the bass black

    black-body-back_orig.jpg black-body-front_orig.jpg
    black-body-front2_orig.jpg
    black-lower-horn_orig.jpg

    Applied the decals
    made-in-velp-decals_orig.jpg
    headstock-with-decals_orig.jpg

    Cut the bone nut (for string spacing only, since I used a zero fret)
    filing-the-string-slots_orig.jpg
    top-nut-grooves-filed_orig.jpg


    After sanding and polishing I started the mounting of the gold plated hardware
    tuner-bushings-and-topnut_orig.jpg
    hardware-installed_orig.jpg
    jackplate_orig.jpg
    tuners-installed_orig.jpg
     
  12. Bruce Johnson

    Bruce Johnson Commercial User

    Feb 4, 2011
    Fillmore, CA
    Professional Luthier
    Beautiful! Clean and elegant. I like that you didn't clutter it up with unnecessary stuff. Let that big bunch of parallel strings be the focus of the design.
     
    srayb, dave64o and Basvarken like this.
  13. M0ses

    M0ses Supporting Member

    Sep 11, 2009
    Los Angeles
    I love love love love love the binding! It brings the whole style together into something absolutely next level. Not generally a fan of the body shape but this bass is SMOKIN!!!
     
    CGramazio, Thundar and Basvarken like this.
  14. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    I bought the binding from custominlay.com.
    You can order it per inch. And they send it in strips of 10 inches and some shorter.
    You have to cut them into little pieces for the tight corners. Because it is not flexible at all.
     
  15. SlingBlader

    SlingBlader

    Oct 19, 2013
    Yes, thanks. They were the only supplier that I had found to date, but I didn't want to pay their price! :D I may just work on some jigs/fixtures to make my own.

    Again, great job on the build, it looks fantastic. :thumbsup:
     
    Basvarken likes this.
  16. Basvarken

    Basvarken Commercial User

    Dec 3, 2010
    Velp Rockcity
    Amateur Luthier / Gibson Bass Book
    SlingBlader likes this.
  17. That is a gorgeous bass! You are a very skilled craftsman. I would love to hear a sound clip.:thumbsup:
     
    Basvarken likes this.
  18. JimmyM

    JimmyM

    Apr 11, 2005
    Apopka, FL
    Endorsing: Yamaha, Ampeg, Line 6, EMG
    Dude, the pin striping that looks like stitching...absolutely fabulous! Looks like an insanely fun bass to play.
     
    bdplaid and Basvarken like this.
  19. I’m a sucker for checkered binding. Count me in on thinking it’s gorgeous!
     
    bdplaid and Basvarken like this.
  20. gmarcus

    gmarcus Supporting Member

    Apr 4, 2003
    Wow this is amazing!
    How is it tuned?
    What does it sound like?
    What inspired you to build this?
    Truly exceptional original build!!
     
    Basvarken likes this.
  21. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
    May 6, 2021

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