On Tuesday, May 6, 2014 5:47:03 PM UTC-4, Nil wrote:
>I still worry about the guitar's >stability the belly might bulge out again.
>
> device called the "JLD Bridge Doctor"
> Does anyone have any experience with it? Does it do what it advertises?
> Does it affect the sound much? Is it hard to install?
Personally I think of them as sound killers but everyone seems to have their own idea about what a good sound consists off. Why, some people might need to install three or for bridge doctors in their guitar to get a sound they really like.
I read rmmga on google groups which provides topic search and the group archive. A search using the term "JDL" shows that the doctor has been VERY extensively discussed on rmmga. Here is a sample, the writer was working on a Guild and was pleased with the results, his guitar came out sounding more like a Taylor:
TITLE: Review: JLD Bridge System
AUTHOR: Bob Henderson,
guit...@bigfoot.com
POSTED TO NEWSGROUP: RMMGA (Recreation.Music.Makers.Guitar.Acoustic)
DATE POSTED: 5/16/97
OVERVIEW
The JLD Bridge System (AKA "Bridge Doctor") is a patented (US PATENT
5-260-505) removable wooden device that is installed inside an acoustic
guitar, underneath the bridge. JLD Guitar Research and Development,
Inc. claims that the device will flatten the top on your "bellied"
guitar, prevent your other guitar’s flat top from ever bellying, improve
your guitar’s balance, make it louder, and improve its sustain. This
review is the result of my buying and testing the JLD Bridge System in
my own guitar.
CONSIDER THE SOURCE
First of all, here’s some background on me so you can "consider the
source" of this review. I am 41 year old microcomputer consultant. I
am not in any way employed by or related to JLD Guitar Research and
Development, Inc., marketers of the JLD Bridge System, or James Oliver,
the inventor and patent holder of the JLD Bridge System (he’s the "J" in
"JLD"). I will get nothing from JLD for having written this review. I
will get nothing from JLD if someone decides to buy the JLD Bridge
Device. I personally paid full price for the JLD Bridge System that I
installed and tested on my own 1978 Guild F-512 guitar for this review.
I also personally paid full price for the JLD Bridge System that I will
be installing and testing in my brand new, incredibly-sounding $4400
custom-built Taylor 955-CE that just arrived last week. I have been
playing the guitar for almost 29 years (boy are my fingers tired);
however, since I am self-taught and play by ear, I’m sure that many of
you who have been playing for ten years are better guitar players than I
am. I’ve followed the RMMGA Newsgroup since 1994, and have gotten a lot
of good guitar advice from many of you, including Charles Tauber, Tom
Loredo, George C. Kaschner, and even Bob Taylor (though I haven’t seen
him here in awhile). This review is my contribution to RMMGA.
THE JLD BRIDGE SYSTEM - MAKE ONE BY HAND
Stretch your arm out full length with your palm facing up. Now, curl
your fingers and thumb into a "U" shape that points up from your palm.
You should now have four fingers side-by-side, making one side of the
"U" while your thumb makes the other side. Next, use that hand to reach
into your guitar through its end pin. Put the tips of your four fingers
right under the bridge saddle and the tip of your thumb right under the
bridge pins. Install five threaded brass bridge pins into the bridge,
using small metal nuts on the inside of the guitar to keep them in place
and to keep your guitar’s bridge from ever pulling off. Insert a sixth
threaded brass bridge pin through the D-string hole of your guitar’s
bridge and screw it into the tip of your thumb. Now, keep your arm
really stiff, and lower your elbow. Notice how you’re using your entire
arm as a lever to push up the saddle side of the bridge and pull down
the bridge pin side of the bridge, flattening your guitar’s bellied
top. Finally, cut off your arm at just the right length to allow your
arm bone to push against your guitar’s end block. If you’ve done
everything correctly, your severed arm will keep the bridge from ever
bellying again. Congratulations -- you’ve just made a human version of
the JLD Bridge System. It may not be pretty or high-tech, but it’s the
perfect solution for anyone who’s ever said, "I’d give my right arm to
be able to fix my old vintage Sears Silvertone guitar…"
THE TEST GUITAR
The guitar I used for this review was a 1978 Guild F-512 jumbo 12-string
that I’ve owned since early 1979. At the time I bought it, it was the
top of the line Guild 12-string guitar. Guild still builds a version of
it, that lists for over $2000 and is available for around $1500. Mine
has Brazilian Rosewood sides and back, and a nicely-aged honey-colored
Sitka Spruce top. After trying several types of strings over the years,
I settled on John Pearse 80/20 lights (.09-.47 gauge) a couple of years
ago, and I keep them tuned up to pitch. The set of strings on the Guild
were about 7 months old and sounded pretty dead. I hadn’t changed them
because I had been expecting my new Taylor guitar any minute (it ended
up being delayed for a few months due to abalone supply problems at
Taylor) and I didn’t feel much motivation to put new strings on the old
guitar. The Guild’s top had about 3/32" belly behind the bridge.
THE AGREEMENT
In the past week, I’ve spent about 8 hours on long distance, talking to
James Oliver, the 52-year-old inventor of the JLD Bridge System, to
learn more about his invention. He told me that Taylor Guitars has been
using a version of his Bridge System to repair bellied Taylors for
years, and Breedlove Guitar Company builds a version of the JLD Bridge
System into every single one of their handmade guitars (you can confirm
this by going to Breedlove’s home page at
http://www.breedloveguitars.com/. Mr. Oliver says he has personally
installed about his Bridge System in about 6,000 guitars over the years
- even some of them in the guitars of famous guitar players who don’t
want anyone to know that they’re using his invention. On Monday, May
12, 1997, I called Mr. Oliver again to order two of his JLD Bridge
Systems. He then asked me to measure the distance between the centers
of my two guitars’ back bridge pins and the centers of their saddles so
that he could make two Bridge Systems specifically for my guitars. As
soon as I finished talking to him, I mailed him a check for $100 to
cover the cost of two Bridge Systems, and Mr. Oliver shipped the systems
to me with his assurance that, if I didn’t like them, he’d take them
back and refund my money. I told him that I was planning to test his
Bridge System in at least one of my guitars and then, whether or not I
thought it worked, I would write a review about it for RMMGA.
THE TEST
Yesterday, Thursday, May 16, 1997, the two systems arrived at my home by
priority mail. Last night, it took me about 40 minutes to install one
of Bridge Systems in my Guild F-512. About half of that time was spent
removing and reinstalling the same curled-up dead strings that had been
on the guitar. As I finger-tightened the "arm bone" part of the device
against my guitar’s end block with the strings removed, I was shocked to
see the 3/32" belly gradually disappear from my guitar’s top. When it
looked nice and flat, I reinstalled the strings and tuned it up to
pitch. Tuning was a whole new experience. As I brought each string up
to pitch using my digital tuner, I could clearly hear the other tuned
strings "singing along" with the newly-tuned string right when it
reached its perfect pitch. Several times, I’d tune one of the strings
up to pitch and then mute it, only to hear its note still resonating
from one or more of the other tuned strings that had started vibrating
sympathetically. At the same time, I heard a lot of overtones and
undertones that I had never heard coming from that guitar before. Once
I got all twelve strings perfectly up to pitch, the first thing I
strummed was a full E major chord. A Guild 12-string is a pretty loud
guitar by nature, but mine was noticeably louder than it had ever been.
I immediately noticed that it sounded a lot more balanced, with more
definition between the different string sounds; a lot like my new Taylor
12-string. Some might argue that it sounded more balanced because it
had lost some bass and treble, but it was clear to me that it had simply
gained a lot of mid-range, giving it a much more balanced sound than the
exaggerated bass and treble mix that I had gotten used to hearing from
it. Sustain was improved as well. With a new set of strings on that
guitar, I was always able to strum a loud E Major chord, put my ear near
the sound hole, and hear it ringing for 20-22 seconds. Last night, I
could hear the E Major chord ring for 26 seconds – with 7 month-old
strings that had sounded dead right before I installed the Bridge
System. I then played some harmonics and was pleased to hear that they
also sustained loud and clear for ten seconds or more. The only down
side I could see was that I had a slight string buzz on the first fret
from a couple of strings when I played it hard. This was due to the
fact that when the Bridge System pulled my guitar’s top back down flat,
it lowered the bridge (and the action) by the 3/16" that the top had
been bellied before. A new saddle will solve that problem.
CONCLUSIONS
The JLD Bridge System does exactly what JLD Guitar Research and
Development, Inc. claims it will do. It flattened the top on my
"bellied" guitar, improved its balance, made it louder, and improved its
sustain. In addition, it appears that it will prevent the top from ever
bellying again. Next, I will be installing one in my new custom Taylor
955-CE. Here’s my reasoning:
1) A 12-string guitar with an Engelmann top is almost certain to belly
with time unless it is braced so heavily that it doesn’t sound good,
2) Taylor’s repair department uses the Bridge System to repair bellied
Taylor guitars,
3) I can either choose to spend $50 on the Bridge System right now to
prevent my new guitar from bellying, or I can wait for it to belly and
then send it back to Taylor to have them install the Bridge System.
To me, it is well worth the $50 right now to prevent problems in the
future.
FOR MORE INFORMATION
If you want to learn more about the JLD Bridge System on your own, you
can visit the JLD web site at
http://netrunner.net/marketing/jld/. The
web pages haven’t been updated in awhile, so they don’t have pictures of
James Oliver’s latest evolution of the Bridge System, but they do have a
lot of valuable information about how the System works. Or, if you feel
like talking to the inventor of the JLD Bridge System, you can call
James Oliver in Avon Park, Florida, at
1-941-452-5239.