Gibson SJ-200 bulging behind bridge.

[fvh]

Hello.

I hope some of you can give me som tips on this issue.
I have a 2010 Gibson SJ-200,and the soundboard is bulging somewhat behind the bridge - and the board goes the opposite direction in front of the bridge.
The bridge tilts forward a little, but it's NOT loose from the soundboard.

What do I do to correct this?

Thansk a lot for your time.

Here's a (bad) pic where you can see that the board is higher behind the bridge than in the front.

[Jim.S]

A good guitar always has some bridge rotation, if there is no rotation at all from unstrung to tuned to pitch then I don't think you would like the sound much. It is hard to tell from your pic if the rotation is excessive. Trevor Gore states that 2 degrees of rotation is a good figure so measuring will tell you if it is too much.

Jim

[fvh]

Thank you for that, Jim.
I'll try and get a better picture, so that it will be easier to make a judgment.

[Vognell]

I believe that can indicate loose bracing....some pull is normal, but if the glue on the bracing under the bridge gives out, it becomes pretty extreme. Probably worth taking to a technician for evaluation.

[CoolerKing]

Originally Posted by Vognell

I believe that can indicate loose bracing....some pull is normal, but if the glue on the bracing under the bridge gives out, it becomes pretty extreme. Probably worth taking to a technician for evaluation.

(+)1. Can be normal, could be a loose brace.

[Protosphere]

Look at how a JLD bridge system works, it will fix it and won't devalue the instrument either.

My only advise is to flatten the belly before installing the JLD rather than let the JLD bridge system do all the work when tightening to adding tension .

For the depressed front part before the sound hole, dampen inside first ensuring sponge doesn't touch any part of wood, then a few days later I simply cut 2 pieces wood the right length and placed them under each side of the sound hole to lift up while placing books on the back half of the top to lift down and straighten the belly. remove dampness and let dry a few days, then install JLD. presto, better than new.

[Halcyon/Tinker]

I think a JLD would certainly devalue the instrument. As well as degrade the sound as that is a lot of weight to add to your top. It will also restrict the guitar's ability to let the bridge rock back and forth which is an important part of it's motion.

Furthermore, I don't think your guitar has any problem at all. It looks fairly normal to me. In a Martin/Gibson bracing pattern, it is normal to see a bit of bulge behind the bridge. But the picture is not clear enough to tell for sure...

But I think you're fine...

[fvh]

Thank you all for your valued replies.
This might be a better pic to show the top.

[Frank Ford]

There's a risk of error judging from photos, but it looks like the classic "loose X-brace wrinkle."

Most often caused by heat exposure, and potentially nasty:

http://www.frets.com/FretsPages/Luth...xwrinkle1.html

[Vognell]

Yep. That's a bit more belly than I'd like to see. I'd take tension off of the strings and get it to a qualified service center. I don't believe its major surgery, though I could be wrong.

[CoolerKing]

Originally Posted by Frank Ford

There's a risk of error judging from photos, but it looks like the classic "loose X-brace wrinkle."

Most often caused by heat exposure, and potentially nasty:

http://www.frets.com/FretsPages/Luth...xwrinkle1.html

(+)1. Much more evident in your most recent photo.