Intonation problem : scale length too short after one (reversible) error

[Pipotron3000]

john.w.lawson is probably right : factory 1993 WAS Schaller/JT590.
But previous owner (or shop) SWAPPED it with a JT580.

Reading this post was clear like water : some ppl done it (one way or another) BUT some got troubles ... like me
https://www.jcfonline.com/forum/equi...94#post1956194

Confirmed here too :
https://forum.seymourduncan.com/foru...lp#post4980924

Schaller mount is SHORTER than JT580 one
That's why it is almost impossible to intonate this guitar ... since i got it second hand.

Today i disassembled it : no play in neck pocket, only half a millimeter "missing" on knifes (it was "cleaner" than expected) ... and G saddle STILL hitting the read plate (and E very close).

Now reading this was clear like water : this guitar was NOT factory mounted with JT580.
This guitar NEED a Schaller/JT590.

Distance between 12 fret and middle stud is 30 cm.
Can you check yours ? (JT580 and/or JT590/Schaller)

[john.w.lawson]

john.w.lawson is probably right : factory 1993 WAS Schaller/JT590.
But previous owner (or shop) SWAPPED it with a JT580.

Reading this post was clear like water : some ppl done it (one way or another) BUT some got troubles ... like me
https://www.jcfonline.com/forum/equi...94#post1956194

Confirmed here too :
https://forum.seymourduncan.com/foru...lp#post4980924

Schaller mount is SHORTER than JT580 one
That's why it is almost impossible to intonate this guitar ... since i got it second hand.

Today i disassembled it : no play in neck pocket, only half a millimeter "missing" on knifes (it was "cleaner" than expected) ... and G saddle STILL hitting the read plate (and E very close).

Now reading this was clear like water : this guitar was NOT factory mounted with JT580.
This guitar NEED a Schaller/JT590.

Distance between 12 fret and middle stud is 30 cm.
Can you check yours ? (JT580 and/or JT590/Schaller)

30 + almost 31 on bridge post 580, under 30 a bit on 590 both are 25.5 scale guitars

[Pipotron3000]

Thanks !

I will mesure mine better, but it seems closer to 590.
I wonder if factory changed trem provider during 1993 ... without changing mount distance

[john.w.lawson]

Thanks !

I will mesure mine better, but it seems closer to 590.
I wonder if factory changed trem provider during 1993 ... without changing mount distance

I'd just get a schaller and if money is a issue get a jt-500 people cry about them all the time and I've had quite a few guitars with them and never any problems. Same specs as a schaller just cheaper metal.. So, just don't treat it like a gorilla when tightening stuff down.

[Pipotron3000]

12 fret to middle post : 30.1 cm (301 mm) on mine ... with JT580 it is too short

Takeuchi JT580 block height : 35 mm so i need a 37mm Schaller block

May be a 42mm will fit. I will check it.

[ed]

any chance to get a picture of the guitar?

[john.w.lawson]

12 fret to middle post : 30.1 cm (301 mm) on mine ... with JT580 it is too short

Takeuchi JT580 block height : 35 mm so i need a 37mm Schaller block

May be a 42mm will fit. I will check it.

32mm a 37 might work a 42 will stick out the back and is used for top mounted guitar without routes

[Pipotron3000]

Schaller on the way !!!

This one :
https://www.zikinf.com/annonces/annonce-2016367

With 37mm brass block AND "no cut" string ball saddles.
Seller is a luthier. A nice guy. He didn't used it on a project. Brand new.
I don't care about no posts and nut.

Here are some guitar pictures :






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[ed]

OK so its a Fusion SS with added knob. Also there is no such thing as ""no cut" string ball saddles" The guitar came with a JT-580 the routing is clear giveaway.

https://www.axebition.com/electric-g...kson-fusion-ss

You are better of measuring the whole scale lenght it should be 24.75inches from nut to the saddle and 12th fret should be at the middle. And this is the high e-string.

[Dak]

I had a reply typed earlier but as usual the forum got flaky and I lost it. It basically said what ed said. FU-SS in the pocket means that's a Fusion body. Fusions were 24.75" scale like he said and the route looks correct for the bridge. Measure from nut to saddles to see what the scale is and report back. The Schaller should work as long as it clears the route. I had one in a guitar that came with a JT-580LP and it intonated just fine. It was a Fusion as well.

[Pipotron3000]

Saddles are changed on THIS Schaller i bought : they are "Edge Pro" like.
You can put strings with balls.
Remember : he is a luthier and create his own "blends"
Like added brass 37mm block.

See this picture to understand (see : no blocks)



About measurement, you can read previous post from john.w.lawson
Inserts are around 1 cm too short for JT580. They are at "JT590 distance".
So G and E low saddles are maxed out.

Don't know what happened ... but it happened.
May be a factory fault.
From 1993 and still running

UPDATE : checked scale length ... 24.8 inch
So YES you are right, it is a Fusion SS
And YES John is right too : inserts are 1cm too short

So now it is going to be a Fusion SS with Schaller

Funny thing : my other Jackson is a JS32 7 strings ... with 26.5 inch scale
I now understand why i had hard time to play it when switching from 24.75

Thanks again !

[Dak]

Also what is stamped on the heel of the neck. It should have FU or FUS on it if it is the right neck IIRC.

[Dak]

About measurement, you can read previous post from john.w.lawson
Inserts are around 1 cm too short for JT580. They are at "JT590 distance".
So G and E low saddles are maxed out.

Don't know what happened ... but it happened.
May be a factory fault.
From 1993 and still running

Measure the full scale from nut to bridge. Also for reference my Fusion that originally had a Jt-580LP is 11.875" approx. 30.1625cm from the edge of the 12th fret to the center of the stud. I think all replies were based on the assumption this was a 25.5" scale guitar.

[Pipotron3000]

Mine is 30.1 cm stud / 12 fret too ... but it is a JT580 NON LP.
And yes i assumed it was 25.5 ... and others too.
Because i said "dinky" ... and it was not

See my previous post update : YES it is the right 24.75 neck, measured

[Dak]

I think since you have the Schaller if it fits in the route it's worth a try. I measured my other Fusion that has a JT590(Schaller) in it and it was 11.8125" or 30.004cm. So the posts sit .0625" or .1587cm closer to the 12th fret. I think it is because the distance from the knife edge to the saddle is slightly further on the Schaller. This should help you out if so. With the Schaller installed on your guitar the base would sit further back on your guitar than the JT-580 base thus moving your saddle further from the nut/ 12th fret. Of course, we are only talking about 1.587mm but in your case every little bit helps.