Preview - Koa tricone

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Preview - Koa tricone

Postby Freeman » Mon Mar 22, 2010 1:41 pm

My latest project

Image

Image
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Re: Preview - Koa tricone

Postby rustyslide » Mon Mar 22, 2010 1:52 pm

Looks beautiful! What's the t-bridge made from? Looks too shiny to be ebony.
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Re: Preview - Koa tricone

Postby Freeman » Mon Mar 22, 2010 3:15 pm

The tee-bridge is an aluminum casting and is either painted or anodized. The cones are true NRP but the bridge is Beard's imported one - it was something like $50, a real NRP is $150. There will be a maple saddle with an ebony cap installed in the slot in the bridge. In that pic the cones are just sittng in the sound well, there are a few more bits and pieces that will go in to help position the parts.

Kind of an interesting project - I spend a lot of time thinking about the geometry of this critter. Normally when you build a guitar the bridge and saddle are the last things that go on it and you have a lot of wiggle room to get the compensation right - with a reso the bridge is the starting point and everything else (neck angle and fretboard location) follow.

Its a month or so from completion but I had to show off.
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Re: Preview - Koa tricone

Postby ricochet » Mon Mar 22, 2010 4:52 pm

VERY cool!
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Re: Preview - Koa tricone

Postby guitarslim101 » Mon Mar 22, 2010 5:00 pm

That looks great so far.
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Re: Preview - Koa tricone

Postby rustyslide » Mon Mar 22, 2010 7:19 pm

Freeman wrote:In that pic the cones are just sittng in the sound well, there are a few more bits and pieces that will go in to help position the parts.


Yeah, my wooden tricone's well is a bit different than the one in yours. Will see if I have pics from when I took it apart last.
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Re: Preview - Koa tricone

Postby birddog » Mon Mar 22, 2010 7:53 pm

Stunning, georgous
Nice to have a bulder to inspire us :wink:

Wally
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Re: Preview - Koa tricone

Postby kiwiblues » Mon Mar 22, 2010 9:10 pm

Beautiful. I envy your luthier skills. Looking forward to hearing it when it's finished. :)
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Re: Preview - Koa tricone

Postby De Ferre » Mon Mar 22, 2010 10:06 pm

Looks very promising.
I wonder how it will finally be.
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Re: Preview - Koa tricone

Postby Old Stella » Tue Mar 23, 2010 11:18 am

I got goosebumps!!
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Re: Preview - Koa tricone

Postby zhyla » Tue Mar 23, 2010 3:22 pm

Very cool. I briefly toyed with the idea of building resonator guitars. Then I looked around at both rooms in my apartment, considered my lack of wood and metal working skills, and came to my senses. Wish I could though!
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Re: Preview - Koa tricone

Postby ricochet » Tue Mar 23, 2010 3:29 pm

I've got people in China building mine.
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Re: Preview - Koa tricone

Postby Buffalo_Bill » Tue Mar 23, 2010 3:50 pm

It's lookin' good Baby! I never thought about it before but, those are huge sound holes there. I guess because the cones provide the resonance, the body can have such large openings.
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Re: Preview - Koa tricone

Postby ricochet » Tue Mar 23, 2010 6:16 pm

That's the standard National tricone vent arrangement. The large open area means the body has a rather high resonant frequency, so traditional tricones are midrangey without strong bass. The cones really act as acoustic transducers or, as they were originally termed, "amplifiers," but the combination of their elastic properties with the string downforce and the mass of the bridge means there will be a resonant frequency to that system. It'd be difficult to calculate, but I rather suspect that the ringing you hear from the guitar after a cough, sneeze, hand clap or such peaks near the "resonator" system's resonant frequency. Messing around with a PA system and EQ controls to find the loudest feedback frequency band would give you a good idea.

The original name of the National Tricone when it came out in 1927 was "National Silver Ampliphonic Guitar." :mrgreen:

"Resonator Guitar" and "Resophonic Guitar" are modern terms adopted to bypass copyrights.
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Re: Preview - Koa tricone

Postby Buffalo_Bill » Tue Mar 23, 2010 8:54 pm

ricochet wrote:That's the standard National tricone vent arrangement. The large open area means the body has a rather high resonant frequency, so traditional tricones are midrangey without strong bass.
Wow, you really got the book down Bro. :) Myself prefers deep tones, or a bass sound in a guitar, and so I prefer a Drednaut over a parlor size guitar. What type of resonator guitar has the best bass resonance Rico?
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