New mando intonation problem

[newbolin]

Well I just finished my first mandolin and was pleased to find that the neck joint didnt bust when strung and it actually Sounds great. But. I find when I tune it by electronic tuner and play chords high on the neck it sounds good but the notes don't match up on the seventh fret. ( ex hold down the g string on seventh and hit the d open, they don't coincide ) this is a pattern for all four sets of strings. Anyone know what causes this and how to fix it?

[Ben Milne]

Do you get a completely different note or is it just sharp/flat.
Do you get an octave at the 12fth fret?
How are the first couple of notes on each string when you play a scale?
If your bridge position is correct or there abouts, maybe your nut is too low, causing the first fret to be the open string...

[newbolin]

I get the octave at the twelfth and the first notes are good it just seems that at the seventh the a and e sets are flat when trying to tune using the seventh fret method although according to a tuner ( and chords sound spot on) the tuning when played open is correct.

[ProfChris]

Does your electronic tuner say the octave is correct, or just your ear? If the tuner says the octave is off then your bridge position is wrong, and moving it will probably fix your 7th fret problem. If the octave is sharp, bridge moves towards the tail, and vice versa if it's flat.

If the octave is correct, then the only possibility is that you've wobbled when marking out your frets.

[toddjoles]

Is your bridge top on backwards?

[newbolin]

Thanks guys for all your replys. I was able to fix it with a different tuner. I was using an iPod app tuner that is kinda iffy. Thanks again.