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PostPosted: Wed May 29, 2019 3:52 pm 
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Joined: Tue Sep 18, 2012 1:17 pm
Posts: 128
First name: Dave
Last Name: Baley
City: Goleta
State: California
Zip/Postal Code: 93117
Country: USA
Focus: Repair
Two quick suggestions. Sorry if they are duplicates of above somewhere.
1) what is the headstock angle to the fretboard?
2) does the D string contact, or almost almost contact, the wood of the headstock as it goes into the tuner roller opening? Is it possible the string is vibrating against the headstock there?


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PostPosted: Wed May 29, 2019 7:18 pm 
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Joined: Sun Aug 25, 2013 9:34 am
Posts: 356
Location: Massachusetts
First name: Rob
Last Name: Lak
State: Massachusetts
Country: USA
Focus: Build
Status: Amateur
bionata... Thanks for the suggestions. Yes, i am also trying to determine if there is something else vibrating. The Chladni pattern testing suggestion is an interesting one, i wonder if it would show up somewhere... or if it would show up on something like audacity software... and even if it does, how do you narrow it down? I have tried damping various parts... just haven't found the correct spot yet i think.

ProfChris.. same comment i think. I need to just try to isolate it.

I think i will try to take it to a local repair guy that helped me with my last issue, then to the next NEL meeting. then fire wood (LOL).

Rob

a great THANK YOU to all who have responded. it's really appreciated!!


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PostPosted: Wed May 29, 2019 7:32 pm 
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Joined: Sun Aug 25, 2013 9:34 am
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Location: Massachusetts
First name: Rob
Last Name: Lak
State: Massachusetts
Country: USA
Focus: Build
Status: Amateur
Dave Baley
- the headstock is at 9 degrees, which i know some say is low, but it is the same as my first acoustic guitar which turned out awesome. I am less inclined (pun intended) to think thats an issue.

- Yes, i kept the same shape of the headstock as my steel string which is different from any classical i have seen. it narrows at the center two tuners and causes an issue where the "D" string does contact the side if I am not careful. I have damped that portion of the string though and am fairly confident that it is not the issue. BUT i think i will move the D string to the B position and see if the issue remains. I previously moved it to the G position but i should have the same issue with touching the side there, so i need to be a bit more sure. i don't think i have the issue with the G string itself.

Rob


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PostPosted: Thu May 30, 2019 11:41 am 
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Joined: Thu Oct 27, 2011 11:28 am
Posts: 183
First name: Leonard
Last Name: Duke
City: Kalamazoo
State: MI
Zip/Postal Code: 49001
Country: USA
Focus: Repair
Status: Amateur
Go over the entire guitar trying to gently flex the wood, looking for a soft spot that indicates an unglued brace. Rap the guitar all over with you knuckles, listening for a crack or unglued part buzz. Do this with the guitar strung up as a crack can be open and buzzing when strung up but closed up and unnoticeable unstrung.

I would also check the fit of the bolt on neck. Now that the guitar has been strung up a while, are the bolts still tight? Figure out what wood is actually touching other wood in there. If you firmly try to flex the neck joint can you feel a "crick" in the joint? Make sure the end block is strongly glued all around.


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PostPosted: Thu May 30, 2019 5:33 pm 
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Joined: Sat Aug 27, 2011 1:59 pm
Posts: 374
First name: Ken
Last Name: Lewis
City: Mt. Pearl
State: NL
Country: Canada
Focus: Build
Status: Amateur
A thread on the MIMF that may have some similarities to your problem, maybe?
Lots of replies. Good luck.

https://www.mimf.com//phpbb/viewtopic.php?f=3&t=4639


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PostPosted: Mon Jan 25, 2021 8:29 pm 
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Joined: Sun Aug 25, 2013 9:34 am
Posts: 356
Location: Massachusetts
First name: Rob
Last Name: Lak
State: Massachusetts
Country: USA
Focus: Build
Status: Amateur
update: taken me a real long time to get anywhere on this, but i have not given up. I have tried many things, refretted with lower frets, opened the back and put ca on all the braces, made a new nut and saddle ( actually a couple of saddles, trying different angles. increased and decreased saddle height. On another thread, Al Carruth suggested that i made the top too responsive that it was picking up secondary vibrations from windings of the strings and when i checked the top i indeed did go way to far with aggressive sanding and had brought sections down to 1.5 mm. so i have pulled the top and made a new top and have glued it all back together. Not sure if i will string her up tomorrow, but maybe later in the day... any way, i am hopeful that this was the problem.

Rob


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PostPosted: Mon Jan 25, 2021 9:14 pm 
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Joined: Sat May 17, 2008 1:11 pm
Posts: 2335
Location: Spokane, Washington
First name: Pat
Last Name: Foster
Country: USA
Focus: Build
Status: Semi-pro
Fingers crossed!

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http://www.patfosterguitars.com


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PostPosted: Tue Jan 26, 2021 2:34 pm 
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Joined: Tue Mar 14, 2006 12:41 pm
Posts: 316
Location: Trois-Rivieres
First name: Alain
Last Name: Lambert
City: Trois-Rivieres
State: Quebec
Country: Canada
Focus: Build
Status: Amateur
Quote:
I have just finished my first classical, my second guitar all around and first guitar done solo. The problem i am fighting is an odd double tone on the D string. sounds more like a harmonic than it does a buzz, and it's noticeable even when played open. There's a slight amount of the same on the A string as well.

I hope your problem goes away with the new top. If not then it is the neck.
You said you had no trussrod, Did you put any reinforcement? Like a carbon fiber rod or the like?
I think it could be that vibrating under the A and D strings.


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