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Old 08-03-2014, 09:34 AM
Protosphere Protosphere is offline
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Originally Posted by Todd Yates View Post
Breedlove uses them in some guitars, not all.

Yes you are right, I was incorrect in saying all.

However, as per Breedlove's site:
"Select models feature the Breedlove Bridge Truss – most commonly the Concert and Auditorium shapes. The BBT reduces tension on the soundboard of the guitar, so the top wood is able to vibrate more freely, producing remarkable sustain, balance, and clarity. The BBT also allows for a thinner graduated top, thereby allowing Breedlove craftsmen to bring out the optimal sound from the top wood without sacrificing structural stability. Relieving much of the string tension from the bridge prevents “bridge belly,” ensuring top stability for decades.

Guitar strings can exert up to 230 pounds of pull from the nut to the bridge. Traditional methods for preventing top bowing at the bridge usually involve heavy internal bracing and thicker tops. The BBT compensates for this pressure in an innovative way: The BBT is mounted to the bridge from the inside and is connected into the tail block of the guitar, pulling downward on the underside of the bridge to distribute some of the tension, relieving pressure on the top. The resulting tonal effect on BBT-equipped guitars is more resonance and livelier sound with enhanced overtones."

"resonance and livelier sound with enhanced overtones" is not desirable?

Based on that, I'll respectfully suggest you have little knowledge of vintage guitar maintenance or repair. This is just not how it works.

You are right, I have very little knowledge on vintage guitar repair. How does it work? Do they replace the top when (not if) it inevitably develops a belly through time. I understand filing the saddle compensates but this can be done only so many times before fret buzz. Right?

(Never say never I guess, but no one with any connection to Martin will admit to ever using a Bridge Doctor. (I've asked a few people who should know.) Next time I'm at the factory, I'll ask again.)

How many time do you visit the factory? Is that where they are made? Do they repair them at the factory? Consider a new top on an old body like I said but I don;t know. I'd at least dampen to flatten which still lasts but not for decades like the JLD. Dunno...

I've discussed it with a few repairmen. Many of the responses break Rule#1, so I'll leave that there.
What is rule 1? If it ain't broke don't fix it? What if they just want it for tone and volume, and what if it is too bellied effecting action to an unplayable degree? Then its broke right?

No competent repairman would suggest replacing or re-bracing a top because there was some belly. The idea that an acoustic guitar showing some belly behind the bridge is always bad and should be "fixed" is completely erroneous. Some belly is normal, and is either built into the guitar or occurs over time. Excessive belly is often due to loose braces or other structural issues which can be repaired without extraordinary measures.

You probably know more than me there so I do not know what would be required if the belly became a real problem. i.e. making the guitar unplayable. I can not see how all guitars braces become loose through time than bend with the wood but I may be wrong here. Braces are wood and flexible, not iron, right?

That said, I'm happy you're pleased with the results on your guitar, but they're not for everyone. They change the tone tremendously and in ways that are not pleasing to me, all the while correcting something that hardly needed correction.
pleased? I am ecstatic, hence my passion.

What didn't you like about the tone, sustenance, and volume that so many throw it on for even without a bellied top? I strongly disagree here in that it transformed my seagull 12 string and a Fender AG10 into supernatural instruments in tone, volume, and profoundly low action that can be played for literally hours effortlessly. The sound blew me away. I am surprised. These are not Martins or Tayors but sound exponentially better tp be than the several thousand ones off the rack, waaaay too tinny.

Martins are well built but when new they sound tinny to me, until they age 50 years. This is what the JLD is said to do, add 50 years to the sound. Even Taylor sounds tinny, albeit not as bad as Martin where a 500 buck Seagull sounds exponentially better than a 2,000 buck Taylor or Martin. Now the 4,000 buck bulletproof Martin had the best tone but still couldn't rival the cheaper 500 buck Seagull but throwing a JLD into that baby would make it supernatural i would imagine, and that is exactly what I would do to preserve the guitar while adding volume, tone, and sustenance. Even though its over a 4 grand instrument I would be nervously drilling to add the JLD.

I am curious and love to be enlightened in exactly what sound qualities are not for you to claim that "They change the tone tremendously" when its more volume and sustenance bringing out the tone that can be easily subdued or amplified, even if it didn't need correction prevented bellying forever that time inevitably forces with 200+ lbs string tension.

Guitars are not forever without this system I guess is my argument, let alone the sound and corrective or preventative action distortion. Like I said, I am surprised they are not putting them in all guitars... yet. =)

Even though I strongly disagree, I respect your opinion as you seem very knowledgeable in this area and I am a tad surprised you found the tremendous change the tone undesirable when it is like adding 50 years to the sound of a guitar. This little device blew me away, for many reasons, action first most and sound an equal second. The amplification of the lows, midranges and highs with such sustenance and volume must be heard to be believed I thought. One could play softer too if they wanted less volume with still beyond incredible sound in my view.

I will research to try and find where I read Martin uses them to repair their bellied tops too. Fixed and sounding waaaay better, why wouldn't they. I'd even do it to a top model brand new one although most people might think this was absolutely nuts to do on something of that value.
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