Intonation problem on low b

Discussion in 'Sevenstring Guitars' started by conorreich, Oct 28, 2020.

  1. conorreich

    conorreich Momento Mori

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    I have my Sterling jp70 tuned to drop Ab and the saddle on the trem is tightened all the way. It will not intonate properly. It's still sharp at the 12th fret. I have a .64 for my lowest string.

    Is this an issue I can even correct?
    So far I've thought about a gotoh replacement bridge or an esp/ltd compensated nut, but the compensated nuts are 48mm and the jp70s nut is 50mm.

    Help me SSO!
     
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  2. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    How often do you play the 7th string that high up the neck? The "match the 12th" intonation method isn't the be all, end all, and is more of a compromise across the fretboard.

    Also, what tuner are you using? How accurate is it? It's not uncommon to skip past an intonation point if the tuner can't keep up.
     
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  3. conorreich

    conorreich Momento Mori

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    I'm using the tuner in my HD500x. That's a good point, I'll try it on my korg. I've been using frets 8-12 a lot learning a couple songs. I could move the position to the E string and be good, but this is bugging the hell out of me. Power chords above the 7th fret are not in tune.

    EDIT: it is much closer to tune with my korg. I'm curious, why are my power chords out of tune if the 12 fret is only slightly off? I'm not using the harmonic btw
     
  4. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    Have you tried a new string? Every so often you get one that just doesn't want to cooperate.

    Was it fine in a different gauge?
     
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  5. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    How far out is it? Have you tried removing the spring on the saddle for a little more room?
     
  6. conorreich

    conorreich Momento Mori

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    No it was way worse when I used the .57 the previous owner had on it. It's a brand new string from string joy and my last set of Ernie balls with a .62 did the same thing.
     
  7. conorreich

    conorreich Momento Mori

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    I took the spring out.
     
  8. conorreich

    conorreich Momento Mori

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    I meant to attach a picture.

    Sorry I'm double replying, we're going to get hit pretty bad today by the storm and I'm a teacher. So we've got a weather day.
     

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  9. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    Neck angle and relief all good?

    The trem looks like it's sitting level.

    How does the nut look? Is the string well seated and no burrs?
     
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  10. conorreich

    conorreich Momento Mori

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    I just adjusted the nut for the .64 low string. No burrs. The string could be a little lower at the nut though. Should I try to enlarge the slot more?
     
  11. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    Hard to say, as long as it's seated well and isn't sticking up like crazy it should be alright.
     
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  12. conorreich

    conorreich Momento Mori

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    Hmmm I'm going to keep trouble shooting. I guess it worst comes to worst I can move the nut a mm or so forward. Thanks Max. You always come to my rescue. ❤️
     
  13. MaxOfMetal

    MaxOfMetal Likes trem wankery. Super Moderator

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    Don't mention it dude, happy to help. :cheers:

    It's so hard to diagnose stuff like this remotely. I'm sure you'll nab it once you start fiddling with it.
     
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  14. crackout

    crackout The Yellow One

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    I'm no 7 string guy, but a 25.50'' scale for a seven?
    Does not sound ideal to begin with. If the bridge is not specifically made for such a purpose, intonation may not be possible to full extent.

    If you run out of space for intonation and the fretted note is still sharp, your only chance might be to change the string gauge of the B. Could end up in a compromise between right tension and tolerable intonation.
     
    Last edited: Oct 29, 2020
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  15. conorreich

    conorreich Momento Mori

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    Yeah it's a 25.5. I've had a 27" and 28.625" before and 25.5 feels ideal to me. I have never had this problem before. When I use my korg tuner it's much closer which leads me to believe it's just falling out of tune real quick.

    Anyways, thanks for the response!
     
  16. cardinal

    cardinal F# Dive Bomber

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    Have you pushed down on the string just past the witness point on the saddle? I have to do this with my Floyd guitars. String tension alone isn't enough to force the string flat against the saddle: you have to help it. It throws off my intonation when I forget to do it. Could be the issue here.
     
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  17. conorreich

    conorreich Momento Mori

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    I have not tried that! So pretty much push on the string at the end of the saddle?
     
  18. cardinal

    cardinal F# Dive Bomber

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    yeah, just to make sure the thicker string is actually laying on the correct point of the saddle. Sometimes these thicker strings end up kinda floating over the end of the saddle and need a little help to lay flat.
     
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  19. nightlight

    nightlight SS.org Regular

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    Sometimes, when you run out of space to move further back, it's a sign that you should move the saddle forward instead. Unless there's a defect, it should be possible to intonate it.
     
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  20. Enjoyabowl

    Enjoyabowl SS.org Regular

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    Following.
    Having the same issue with my ibanez s7420 on the low B with .64 tuned to drop Ab. The other 6 string intonate just fine, using the 5th and 17th frets, and 12 to open. Bridge is setup per ibanez factory manual, neck relief at .4mm and action at 2.25 mm at the 12th low B. The
     

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