Currently Being ModeratedOct 30, 2011 10:49 AM (in response to bmcmanus)Re: Unable to correct JTV-59 intonation
On the rear of the JTV59 bridge, on both the left and right (top and bottom) sides, just above the screw posts, you will see allen key sockets. These allow you to move the bridge forward (towards the nut) or back (away from the nut). You should be able to move your bridge back to allow you to then move the saddles further back and set the intonation correctly.
The JTV59 allows you to move the entire bridge up and down or back and forward as well as the individual saddle movement.
Currently Being ModeratedOct 30, 2011 1:55 PM (in response to edstar1960)Re: Unable to correct JTV-59 intonation
Thanks, edstar. I neglected to mention in my post that the bridge is nearly as far back as it will go. If I move it any further back, the bridge height adjustment screw will not be accessible through the slot on top.
Currently Being ModeratedOct 31, 2011 3:20 AM (in response to bmcmanus)Re: Unable to correct JTV-59 intonation
Sorry to hear that. If you have already moved the bridge back as far as it will go, and the saddles as far as they will go, and you are still getting a sharp note at the 12th fret, then you have run out of options, and it sounds as if there may be a physical problem with your guitar such as the bridge being positiioned incorrectly so that it is too far forward. This is a complete guess of course based simply on the information you have told me.
What guage strings are you using? The JTV59 has been designed for use with 10's and should have plenty of scope for adjusting intonation correctly when using those strings.
What strikes me as odd, is that by raising the action you are effectively lengthening the distance between 12th fret and saddle, so I would expect you should have to move the saddles and possibly the bridge forward to correct for that. If you were lowering the action then I would expect you to have to move saddles and possible the bridge back.
I would recommend that you take it to a luthier to have it checked out and professionally set up - if there is anything wrong with it then they would be able to tell you, and if it is faulty then you can contact Line6 to get it rectified under warranty. Or you may prefer just to contact Line6 by phone in the first instance and just ask them to look at it for you.
Certainly, this is not a generic problem with the Korean JTV59's - they should all be able to be set up correctly.
Good luck with getting it resolved.
Currently Being ModeratedNov 1, 2011 11:33 AM (in response to bmcmanus)RE: Unable to correct JTV-59 intonation
What gauge of strings are you using?
I agree with edstar1960's suggestion to have a luthier perform a setup for you, and report back to us if you run into any further issues.