Jul 22, 2016

F907 Bridge Modification / correction

Not long ago, I replaced my Micarta with a bone saddle. As you can see, the saddle height is very shallow and the break-angle is almost non-existent. I got to the action I like (went too far I guess) but the saddle height is a real issue. There is no downward pressure on the saddle, and in a couple of the photos, you can see that the saddle is pulled slightly toward the nut. The saddle slot is worn a bit which complicates the situation 




The neck relief was off slightly - not bad for a 44 year-old guitar. I corrected that, but it didn't address the real problem, of course.

The correct solution is a neck-reset, and even though this is a guitar that I am emotionally attached to (my very first one) I can't justify paying for a reset and not inclined to do it myself. 

So, my solution is to shave the bridge 1mm. I spent a lot of time (off and on, since I am not in a rush) planning this operation. The bridge is actually fairly thick, and can afford to go on a 1mm diet.

Martin's spec for saddle protrusion is 3/32 min to 3/16 max (2.4mm - 4.8mm)
I currently have 2mm, so shaving the bridge 1mm will give me a min of 3mm bridge protrusion. My action is a bit too low, so I should end up with about 3.5mm when done. I will work on the new saddle to get the final height. All of this should get me the cut-angle I need for proper downward pressure on the saddle. The distance of the pins to the saddle doesn't make it easier btw. 

Shows the thickness of the bridge. About 8mm in the back. 



Patient is preped for surgery


I marked a line on each side that represents a 1mm cut, and taped the sides so they are't damaged while I am shaving the top. I will blendin the sides as a last step.


The new bone bridge blank is very thick, which gives me a lot of flexibility with compensation. It will fit nicely into the slot. 

I am also replacing the nut with a hunk of bone, but that is too boring to detail. 

I will post more photos after the surgery is complete. 

She is looking forward to post surgery life. 

-----------------

Surgery was a big success. It took about 3 hours in my 95 degree garage but we made it. 
I shaved about 1.5 mm from the top of the bridge and then made a new compensated bone bridge. I added a bone nut as a bonus. 

Better cut angle:




New bone nut:






Showing off the Grevin Tor-tis 30's style Pickguard. 


Plays great!

Action is slightly higher than what I had before, but I wanted to make sure there was enough downward pressure on the saddle. 

I set to Martin 000-28 specs of course if possible. Here is what I have now:

Bridge height: 8/32
Saddle protrusion: 5/32 bass, 5/32 treb
Neck relief: 0.010
Action at 12th fret:  3/32 bass, 3/32 treb ( I will lower a hair at next string change. 
Action at nut, 1st fret: 0.020














Dallas Dreadnought-Style Acoustic

I discovered photos of a Dallas branded acoustic guitar. It appears to be a dreadnought size and shape but hard to tell in the photos. 

It was made in Japan.
Uses the same truss rod cover as most Jedson and Terada acoustic guitars.
It seems to have most in common with the Jedson 9000 








Dec 31, 2014


Welcome!


Apparently, little is known about Jedson guitars. This site is intended to be a place where information about the guitars can be combined for the benefit of anyone having an interest in them. They may not be collectable guitars; however they certainly are rare!

The main website is located at http://jedsonguitars.net


It you have any information to share or if you are the owner of a Jedson guitar, we would love to hear from you! info@jedsonguitars

If you would like to post a comment to this blog site, please feel free to do so. The comments are moderated and all that are appropriate will be posted as quickly as possible. I will not publish posts for individuals looking to sell their equipment (or viagra etc.) The best place to sell is on eBay. My main website has a "blue pages" page which shows the average selling prices for Jedson guitars on eBay.

Your blog posts can be accessed via the "comments" link under the main post.

Enjoy!

Mark E



Aug 4, 2014

Interesting Dreadnought Model

Someone recently send me an email asking if I knew the model number of their Jedson acoustic because there was no model number printed on the label and the guitar didn't quite match up with any of the others we know about. Here are some photos and things I noticed that are unique about it.



From this distance, it looks like a 9000



Deep Mahogany Body



One-piece Back (laminated)




Badge Attached With Pins







No Model Number on Label

This might be similar to the W130, but I can't be sure because I only have a little information on the W130.








Jedson Guitar Specifications

Hi folks,

I would like to build a table of specifications for the various Jedson guitar models, particularly the acoustic guitars.  I can provide details for the F907, but would love to have specs for the various Dreadnought and 12-string guitars.

Some of the specs I would like to show are:

Construction
     Back and sides material (assume laminated.) Most are  Mahogany or Rosewood.)
     Top material (laminated or solid).  Most appear to be sitka spruce.
     Neck material (most are Mahogany.)
     Fingerboard material (most are E. Indian Rosewood.)
     Logo (inlay, printed, mounted badge etc.)
Details
      Model number printed on label
      Serial number if it exists (inside guitar on neck block in most cases.)
      Overall length
      Depth at neck
      Depth at heel
      Width at upper bout
      Width at waist
      Width at lower bout
       Diameter of sound hole
       Width of fingerboard at 12th fret
       Width of fingerboard at nut
       Type of tuners (open or closed)

And anything else you think is unique and you want to share.

Thanks,

Mark

Jan 22, 2014

Expanding Blog to include other Terada brands

Since we know that Jedson acoustics were made by Terada and there are strong family resemblances to other brands made by Terada, I will include those in the blog from now on.

                         Terada T1000                                         Jedson F907

Jan 4, 2014

Thumb Guitars

Another brand made by Terada was Thumb.


The Thumb Gibson J200 copy above can be seen in this gallery:

It has a 3-piece back like the Jedson. The Gibson has a 2-piece back which is a better design for excellent tone.

Mar 26, 2012

Jedson Guitar Scale Length

Hi folks,

Can we make a list of scale lengths (and other measurements) for Jedson models?
I had a recent request for the scale length for a tele but I don't have one to check.

Thanks,

Mark

Sep 9, 2011

Updated site and blog design

You probably noticed that I cleaned up the blog site and altered the placement of some of the widgets. I also updated the main site .  I like a cleaner look with fewer graphics -- this should help in page load times.

Any comments or suggestions are welcome.  I will make a few more updates, including adding more photos soon ...

Sep 8, 2011

Jedson acoustic guitars made by Terada

My friend Ian Barker and I spent a lot of time investigating the makers of Jedson-branded acoustic guitars. It is blatently obvious that the guitars were made by Terada.

At least two, but probably more, Jedson models are identical to Terada models. Because of this,
I created a PBase gallery for the Terada acoustic guitar brand. I don't intend to let it grow to the point as the Jedson guitar sites.

Aug 29, 2011

Jedson 1930-1931 Catalog

Front cover of 1930-1931 Jedson catalog. I will update my history page to include new information discovered.

Jul 27, 2010

Jedson Acoustics in the USA

I am afraid to ask, but does anyone know of any Jedson acoustics that are available in the USA?  Shipping from the UK is pretty expensive.

Acoustics: solid or laminated

Calling all Jedson acoustic owners,

Can you please examine the back and sides of your guitars and try to determine whether yours has laminated wood or solid?  I believe, based on examination of my own, that these acoustics are made of solid wood from top to back. I am 100% sure that the tops are solid spruce.

Apparently, all of the Jedson (and other Terada-made) guitars of the period have laminate sides and back. The higher-end models have solid tops. A few models (mainly early ones or cheaper) have laminated tops. From what I have seen, the T1000 is a cheaper version of the F907. The T1000 has a laminated top versus the solid top on the F907.

Jul 12, 2010

Value going up ?

I just received a couple of Jedson catalogs on CD from a fellow on eBay.  The Jedson name was in use as far back as 1930!  I think this will help boost the "vintageness" of the Jedson brand.

I asked the provider of the catalog information if I can post some of the content on the blog and/or the jedsonguitars.net website. If I get an approval, I will post the interesting content.

I can tell you that one acoustic guitar model looks just like my F907 except that it has a tailpiece. I suspect that Jedson made the guitars in house back in the 30's but outsourced the manufacture around the time Dallas merged with Arbiter. Outsourced to Japanese guitar makers obviously.

As you might see from the recent posts under the "Post here if you have a Jedson Acoustic" topic, Ian and I have concluded that several of the 70's Jedson acoustics models were made by Yamaki in Japan.

Nov 22, 2009

Acoustics are more loved ?

After watching the blog for a while and other activity going on about Jedsons, it seems pretty clear to me that the Jedson acoustic owners are the most passionate about their guitars.

May 8, 2009

Jedson Lap Steel sold on eBay


A lap steel like this one sold on eBay recently for 370 GBP. There were 15 bids. Obviously these are in high demand. Probably the most desirable Jedson instrument with the possible exception of banjos.

Apr 30, 2009

Jedson Drums


Did you know that Jedson (J.E. Dallas) was primarily a drum maker? Drums and Banjos were the first Jedson products and many collectors view these as much more collectable. Guitars seemed to be an afterthought,and that was right before the brand was discontinued and Dallas Arbiter fell apart. Of course, the lap steel is the most sought after Jedson instrument. Below is a Jedson snare drum that recently sold on eBay.

Aug 5, 2008

Jedson "Super-Strat"



A couple of Jedson "Super-Strat" guitars have been brought forward. They have three single-coil pickups and a full set of control options. These guitars are clearly (at least to me) made by Teisco in Japan during the late 1960s and early 1970s.

Apr 15, 2008

Thin-line hollow archtop



I found this thin-line hollow archtop model and had it shipped from the UK to the USA. It literally came out of the closet after 35 years! It's in mint++ condition, almost as new. See the photo gallery for detailed photograph.

I'll do a full writeup, but here's what I found so far.

* The entire body is laminated -- looks like Maple
* The neck is made of some sort of strange laminated hardwoodlot of them!
* Bound body and neck -- not high quality binding
* Very dark stained rosewood fingerboard (almost as dark as
ebony) having small and low frets.
* There is no headstock angle -- there is a straight run from
the tuning pegs to the tremolo
* The only indication that Jedson (Dallas Arbiter) had anything
to do with this guitar is the badge on the headstock. The
badge is a glued on piece of thin metal with the Jedson
logo painted on -- very cheap
* Full wooden floating bridge -- compensated saddle and base.
Since the saddle is like new, I will see how it plays. I suspect
there will intonation issues and will probably replace it with a
tunomatic roller bridge.
* Dual P-90 style single-coil pickups.
* The pots/knobs are very stable and smooth turning -- a little
more pressure is required to turn these than on my other
electrics -- seems like high-quality electronics.
* The neck is pretty straight -- better be with all that laminated
maple!

More to come!

UPDATE: Since my original post, three additional samples were discovered. One was listed on eBay ad two other owners came forward and discussed theirs.

Nov 1, 2007

Jedson Les Paul copy!

Beautiful Jedson Les Paul copy located. Thanks to Simon Edwards in the UK for the photos!



Several flame maple LP copies have also been located. Here's the most beautiful example:




Click here to see the entire gallery

Jedson SJ-200 (Gibson) copy



Beautiful Gibson Super Jumbo (SJ200) copy!
Images provided by owner, Henning, in the UK

Differences from the Gibson
--Slightly different bridge, although at least one model SJ-200 has this bridge
--Jedson has three-piece back

See the rest of the photos in the gallery