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  #1  
Old 01-27-2010, 02:31 AM
jgparker  is offline
 
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Question

Jem 7v intonation problem


I have it intonated at the 12th fret, so from the 1st to the 12th it is in tune/intonated BUT from the 12th to the 24th fret it starts rising sharply to almost a full half tone on the 24th!
What needs to be done? Do I need to use the truss rod?HELP!!
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  #2  
Old 01-27-2010, 05:56 AM
nuno  is offline
 
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Re: Jem 7v intonation problem


intonate it at the 24th, and be sure your string action isn't set too high
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Old 01-27-2010, 09:54 AM
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Re: Jem 7v intonation problem


Try intonating with a decent tuner by matching the fretted notes the 2nd and 14th fret. This should get all *fretted* notes reasonably close.

If after doing this you notice that the open strings are off in relation to fretted notes, it would indicate a nut placement problem. If this were the case, it would explain why the standard 12th fret harmonic intonation method doesn't work for you.
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Old 01-27-2010, 12:29 PM
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Re: Jem 7v intonation problem


12th fret intonation doesn't work because it doesn't take much of the scale into account.

A Peterson manual will recomend 5th and 17th fret. The last few frets will still be a little sharp but not as much as with the antiquated 12th fret method.

I always liked last fret intonation because it leaves the lastm frets in tune where they will be sharp in any other method. You can always add pitch with pressure but you cannot take pitch away. Using last fret the middle range of the neck will be a little flat though.

That's just how guitar necks are. Quite imperfect.
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Old 01-27-2010, 04:09 PM
jgparker  is offline
 
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Re: Jem 7v intonation problem


Thanks everyone for the advice. I will try these techniques. Guess I should try these techniques using a new set of strings rather than trying to intonate on a month old pair right?
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Old 01-27-2010, 04:44 PM
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Re: Jem 7v intonation problem


Most assuredly...
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  #7  
Old 02-06-2015, 05:56 PM
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Re: Jem 7v intonation problem


Does anybody have problems intonating the low E string? For me the fretted notes are always too sharp and there is no room to bring the saddle back any further (its maxed). This isn't just a problem with my jem (I have 2 strats and with the same problem). I've tried everything in the past - doesn't matter if strings are new, neck is adjusted, etc. In fact I bought a new strat with the same problem! Nobody seems to have a decent answer or solution.
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Old 02-07-2015, 01:34 AM
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Re: Jem 7v intonation problem


String height as already suggested. 17th is a good compromise. Look at what Rich wrote. You will never get it perfect.
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Old 02-07-2015, 02:28 AM
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Re: Jem 7v intonation problem


Quote:
Originally Posted by green2 View Post
Does anybody have problems intonating the low E string? For me the fretted notes are always too sharp and there is no room to bring the saddle back any further (its maxed). This isn't just a problem with my jem (I have 2 strats and with the same problem). I've tried everything in the past - doesn't matter if strings are new, neck is adjusted, etc. In fact I bought a new strat with the same problem! Nobody seems to have a decent answer or solution.
What year is your JEM?
__________________

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Old 02-07-2015, 08:54 AM
Kyle am I  is offline
 
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Re: Jem 7v intonation problem


Or you can get a TT neck
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  #11  
Old 02-07-2015, 02:26 PM
green2  is offline
 
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Re: Jem 7v intonation problem


Thanks for all your feedback.

My jem is from the 90's....probably around 1997.

What is a TT neck?

My string height is fine. Neck is not warped. Frets are fine. I know some have said it could be a nut problem or too much pull from the pickups. Maybe, but doubt it since this is a problem on some other "strat-style" guitars I have. I understand intonation is a compromise. The problem is the fretted noted are sharp. So when I play below the 5th fret the tuning is great. When I started fretting chords around the 7th fret, the low E string is so sharp it sounds horrendous.
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  #12  
Old 02-07-2015, 03:18 PM
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Re: Jem 7v intonation problem


So that means simply that you haven't set up instonation. Set it so that either 12th or 24th fret give a straight E with light fretting. Or 17th fret giving an A. I like the idea of the 17th fret based intonation for higher strings. For lower strings go with the 12th.
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  #13  
Old 02-07-2015, 07:51 PM
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Re: Jem 7v intonation problem


I can't set anything. The saddle is maxed out - i need to lengthen the string (to decrease pitch) but there is no room to make any adjustment. The other strings are fine and can be adjusted comfortable in either direction. Its just this low E string that's driving me nuts.
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  #14  
Old 02-08-2015, 01:06 AM
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Re: Jem 7v intonation problem


OOOps, sorry I missed the maxed out part. I think it is time to get your ruler/caliper/tape measure out and start measuring lengths, just to be sure. I dont have a Jem but people here who have one might want to help. Also you might try to check that particular saddle for anything abnormal. Also the frets might not be completely parallel to each other. Do you have consistent sharp notes on low E from 5th-24th fret?
EDIT : do you have a 25.5" guitar which does not have this issue? Then measure all the relevant lengths. Maybe your fretting finger presses too hard?

Last edited by panix; 02-08-2015 at 01:58 AM.
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  #15  
Old 02-08-2015, 12:49 PM
jer3d  is offline
 
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Re: Jem 7v intonation problem


Quote:
Originally Posted by green2 View Post
...What is a TT neck?...
I believe that is where the fret does not go straight across the fret board. It is curved. Not sure what models have those but I've seen them mentioned here in greater detail. ^ ^
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