I made these measurements on a few of my guitars, to compare the Neck profiles.

As noted in the table above, the JTV-69 has the narrowest Nut width at 1.6135 inch, and the widest E-E string spacing grooves cut in the Nut at 1.3815".

It leaves only 0.116" available fretboard under the E string, which after beveled fret edges is more like 0.055" inch available fret area under the E string before it fall off the edge of the fret board. For reference 0.055" inch is the thickness of a dime.

Also note the E-E Bridge string spacing is the widest on the JTV-69 too (2.1055"), which for me (as a Gibson guy used to 2.065" ) makes cross picking a tad too far, but I can adjust.

Link for typical Bridge specs is here:

http://www.callahamguitars.com/blocks.htm

At this hour all I can report is the Nut width on my JTV-69  at 1.6135" feels too narrow.

The stated JTV-69 Nut width is 1 5/8" (1.6250") , so mine falls short of that specification by 0.0115" inch.

In know on paper, 0.0115" inch does not sound like a big deal, but look at this pic to see my problem.

Look at the marginal fret contact area just to the right under the low E string.

Compare the above pic with my Variax 600 below:

By contrast, the Variax 600 has plenty of fretboard room on either side of both E strings.

My only choice is replace the current 1.3815" E-E spaced Nut with a Strat Graphtech nut with a narrower 1.363" E-E spacing.

or

Order a custom Warmoth Neck to my preference (Fat '59 LP  Profile, and Nut width of 1.75" )

But on my JTV-69 with a neck with a narrow nut width at 1.6135", forces me to cut a new  custom narrow spaced Nut to keep the E strings on the fretboard. But the end result creates a $1400 guitar with a neck that makes it damn hard to play a clean 1st position A7 chord, and not mute the open G string with my fat fingers.

Maybe I can sell my JTV-69 to a rich kid with small hands.

In the above table I included a new Jay Turser Strat for comparison.  That guitar plays great and has a wonderful fret job. I got it a couple months ago from Amazon.com during a one day sale for $55.

Bottom Line

The big issue for Line 6 's success with the Tyler JTV-69 in my

opinion is that World Music needs to be supplied with a proper

"Tyler Variax Minimum Dimension Specification Acceptance Checklist"

that gets signed off prior to shipping Tyler Variax's to the USA.

They need a good set of Mitutoyo Digital Calipers and have a final QC

guy in Korea measure all the critical Neck profile dimensions. If its

too narrow, it fails acceptance, and gets rejected.

Without guidance, you will take whatever they want to ship you that

week, and that not good for anybody.

When I worked at Ernie Ball  / Music Man 1998-2001, we had a big

problem with the guys in the sanding department removing too much wood

from a perfect CNC cut Maple Neck. As a result, the MusicMan Guitar

Neck Profiles were a "moving Target", and custmers had to play 5 of

them to find one they liked. But our European Dealers demanded we

deliver a consistent  product, so we had to enforce stringent QC steps

and re-train the production line workers.

  I'm sure you have a  similar problem today there at Line6 with the

Tyler Variax's, i.e. line up a population of ten "identical"  JTV-69's

and takes measurements on each one,  and record on paper the actual

Fretboard Width under the 1st fret, and you will find the Tyler

intended  1.625 (1 5/8) inch (41.27mm) Nut Width dimension will

actually vary +/- 0.050" (1.36mm)   - which is quite a lot!

If you guys were smart - just change the spec on JTV-69 Nut width to

the typical "SuperStrat" Warmoth/Valley Arts type Nut Width which most

session players prefer:  1.687 inch (1 11/16") (42.85mm) and all these

problems of both E Strings falling off the edges of the Fretboard will

disappear.

===========

JTV-69 SPECIFICATIONS

• Alder body
• Bolt-on solid maple neck with rosewood fingerboard
• 25-1/2" scale length
• Tyler '59 neck shape
• 22 medium-jumbo frets and dot inlays
• 1-5/8" Graph Tech Black TUSQ XL self-lubricating nut
• Sealed locking/staggered tuners (16:1 turn ratio)
• Chrome hardware
• Fully adjustable Tyler-designed tremolo bridge
• L. R. Baggs Radiance Hex piezo pickup system
• Alnico bridge humbucker and vintage-style neck and middle single-coil pickups wound to Tyler's specs
• Master volume and tone knobs
• Model knob and Alt Tune roller knob
• 5-way selector switch
• VDI (Variax® Digital Interface) for integration with Line 6 POD® xt, POD® X3, Vetta™ II amplifier, and other Line 6 products
• Li-Ion battery (12 hours of play time), and international wall charger
• Variax Workbench™ software and USB interface
• Includes quality padded gig bag
• Additional battery, charger and cable kit available separately