Intonation Problem?

Headphones

Chaps, a little exercise of your grey matter please:

I've just had a new nut fitted to my Strat, so I've given it a quick set up, to check the alignments.  The four top strings didn't need adjusting (just a whisker of height as you might expect).  The bottom E moved a tad, but it's the A that's making me wonder, it moved a very long way forward to intionate and is now ahead of all the other strings.  It plays in tune everywhere and all seems normal, it's just not a saddle alignment.  The strings are new and I've measured with my TC Polytune, my Pod Pro's tuner and a 'phone app.  Here's the pic, any thoughts?

http://i1260.photobucket.com/albums/ii567/Elephanttoo/Bridge_zpsmlrmxutn.jpg

SteveRobinson

Faulty string maybe? I've had sets from a certain manufacturer where the A string wasn't uniformly wound and caused just that effect.

If the string is okay, i find that Strat intonation problems are caused by pickups being too high and pulling the string out of tune.

Headphones

Will have a good look at the string, thanks.

Doubt the Pup as it hasn't changed, but...

WezV

SteveRobinson;1127601" said:

Faulty string maybe? I've had sets from a certain manufacturer where the A string wasn't uniformly wound and caused just that effect.

If the string is okay, i find that Strat intonation problems are caused by pickups being too high and pulling the string out of tune.

+1

I have had it happen specifically on the A string a few times

viz

Is it a different age string compared to the others? The bridge position for perfect intonation is dependent on the age of the string. Also is it the right gauge, ie part of the set?

longjaw

WezV said:

SteveRobinson;1127601" said:

Faulty string maybe? I've had sets from a certain manufacturer where the A string wasn't uniformly wound and caused just that effect.

If the string is okay, i find that Strat intonation problems are caused by pickups being too high and pulling the string out of tune.

+1

I have had it happen specifically on the A string a few times

And me: http://www.thefretboard.co.uk/discussion/75347/new-world-record-time-for-restringing-a-guitar

FelineGuitars

I'd wager a rogue string is to blame

Headphones

Thanks for the thoughts chaps.

Have now run through the whole set up again, tried cranking the pickups down a long way too - no difference.

The string feels like the right gauge and I can see or feel no defect in it (even used a magnifying glass).

This is a new set I'd passed to the luthier for the job, which he appears to have used.

I like my trems to float, so if the guage were really different the bridge would show signs but has only shown in this way.

I suspect - since it plays fine - the real answer is to live as it is and check it all again at next string change, about a week or so in this weather!

WezV

its always been new strings when its happened to me.   It can just be a flaw in the winding which makes it impossible to get right