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Responsiveness in Acoustic Guitars.

Portland Guitar claims that curved bracing(falcate) is more responsive than traditional X-bracing, a Collings D2H and a Portland Guitar are compared to show this. We record the difference in theoretical and recorded note at each string of each fret(intonation errors). Near the air resonance of the body (f#-A#) an interaction occurs. This interaction is the response of the guitar to the natural low frequencies.   These graphs show the difference between desired and received note in guitars with different bracing patterns. First is a Collings D2H  This uses a traditional x-bracing system. You can see that each note runs a little sharp. Around the air resonance, F# to A2, there is constructive interference occurring causing a peak. There is little to...

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Instructions for Portland Guitar’s Split Saddle Adjustable Compensation Bridge

  Build Instructions: As delivered the bottom of the bridge blank is flat. The depth of the blank may be deeper than necessary. The wings are left for you to finish with your own design.  If your guitar has a domed top the bottom will need to be shaped to fit.  The depth of the blank can be set by sanding the bottom.  The specific depth will depend on the particular design of your guitar.  We’ve had success using the same depth as a standard bridge. When sanding, remove the bottom evenly. To match the bottom of the bridge to the top of the guitar: use double stick tape to adhere an 8.5” x 11” inch sheet of 100 grit...

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Guitar Rosettes and Fine Inlay Guitar Art

 The rosette, contra-rosette, and inlay sound hole artwork are distinguishing features of Portland Guitar. The art should not stop at the top of the acoustic guitar, so Jay creates a complimentary medallion (Contra-Rosette) that is installed under the sound hole. You do not need to have a label advertising the fact that this is a Portland Guitar. Yet, an appropriate label is included inside the body in an unobtrusive location. Below are a few examples.         

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Elegant Micro-Tuned Action in Electric and Acoustic Guitars

Portland Guitar uses a tilt-action neck that is completely hidden from view. In order to make a change the strap pin at the heel-stock is unscrewed and a hex driver can be inserted into the socket. By making a small turn the angle of the neck to the body can be changed from outside the instrument. It is possible for the acoustic guitar owner to make millimeter adjustments to the height of the strings above the fret board without changing the bridge saddle. No more going into a shop for a bridge replacement or fretting over humidity.  The split saddle nut and bridge act together to provide not only acoustic intonation adjustments but also action adjustments. By inserting shims below the...

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