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ESP LTD BK-600 Bill Kelliher Signature Guitar

Written by

Elliot Stent

Bill Kelliher from Mastodon needs some serious firepower to play those brutish, chugging riffs and the LTD have given him his very own signature model called the BK-600!

It's very similar in shape and feel to the well-known Eclipse models but with some important upgrades and changes that Bill required.

It has the full sized eclipse body with no waist cut and a 3-piece mahogany set-thru neck for increased sustain. With a scale length of 24.75" you'll easily get away with using heavier strings without hurting your hands.

The neck is flat and easy to play with a modern Thin-U shape on the back and a flat Ebony board on the front, and you'll always be in tune with the LTD branded locking tuners.


Perhaps the most unique feature on the BK-600 is the pickups. It comes standard with the signature Bill Kelliher Lace Sensors. They're called the Dissonant Aggressors and they have got the ability to coil split.

These pickups are not incredibly high output, but really offer a lot of clarity under high gain. This will mean you can play clean, overdriven and heavy distortion parts with ease without ever muddying up your guitar tone. They also clean nicely with the master volume allowing you to use a single channel amp on high gain, and roll off the volume for clean sections.

Here's what LTD say ABOUT THE BK-600

The BK-600 is the LTD Signature Series guitar for Bill Kelliher, guitarist for influential American metal band Mastodon.

Designed by Bill to provide the wide range of tones needed for Mastodon’s music while being sturdy and reliable enough for his most punishing rhythms and brutal riffs throughout long tours, the BK-600 is based on the single-cutaway ESP Eclipse guitar style, along with a traditional full body thickness and no waist cut.

Its three-piece mahogany neck is joined to the body with set-thru construction at 24.75” scale for smooth and comfortable fast access to the upper frets.

The BK-600 offers an ebony fingerboard with pearloid “ESP Flag” inlays and 22 frets, as well as binding on the body, neck, and headstock.

Its sound is generated with two of Kelliher’s own signature Lace Sensor “Dissonant Aggressor“ pickups, a sonically versatile humbucker set with excellent dynamic response, sustain and tone.

The flexible sounds of the BK-600 are controlled with master volume and tone knobs that each offer a push-pull control to split the bridge and neck pickups respectively.

Other professional features on the LTD BK-600 include locking tuners and a TonePros locking bridge, and it’s available in a distinctively cool Military Green Sunburst Satin finish.


  • SCALE: 24.75"
  • BODY: Mahogany (full thickness)
  • NECK: 3Pc Mahogany
  • FINISH: Military Green Sunburst Satin
  • NUT WIDTH: 42mm
  • NUT TYPE: Molded
  • STRAP BUTTON: Standard
  • TUNERS: LTD Locking
  • BRIDGE: Tonepros Locking TOM Bridge & Tailpiece
  • NECK PU: Lace Sensor Dissonant Aggressor *(Pull Tone to split)
  • BRIDGE PU: Lace Sensor Dissonant Aggressor *(Pull Vol to split)
  • ELECTRONICS: Passive
  • ELECTRONICS LAYOUT: Vol(Push-Pull)/Tone(Push-Pull)/Toggle Switch
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