Sinon je viens juste de recevoir une réponse de Paul Galbraith par mail, à propos du choix des cordes. C'est très étonnant... je copie ici une partie de sa réponse.
Pour résumer il accorde maintenant sa guitare en SOL, un ton en-dessous donc, et il utilise du fil de pêche ("Seaguar Fluoro Premier") pour les cordes 2-3-4. Pour ce qui est de la première corde il privilégie la corde la plus épaisse possible, D'Addario J44. Enfin il mentionne la possibilité d'un diapason plus large de 60cm à 66cm ce qui marcherait mieux d'après Martin Woodhouse."As to the all-important question of stringing, I use as thick a nylon 1st string as possible, as it simply sounds & feels better. If it gets too tense, or threatens to break, then I tune everything down.
In fact, I tune the whole guitar down a tone these days, and it's working very well for me - with thicker strings right across:
> 1= Extra High tension E (D'Addario, or equivalent);
> 2= Seaguar* fluorocarbon 50lb test (0.66mm);
> 3= Seaguar " 60lb test (0.74mm);
> 4= Seaguar " 90/100lb test 'Big Game' (0.93mm);
> 5= D'Addario NYL031W;
> 6= D'Addario NYL040W;
> 7= D'Addario NYL052W;
> 8= D'Addario NYL064W (you have to order this one specially, as they don't advertise it commercially - they make it to order for me. Though I think some other string manufactures produce this thick string normally.)
> NYL062W or even NYL060W also work, especially if your guitar gives a reasonable length here (see below - Martin Woodhouse).
> *Seaguar is a fishing line from Japan - you can order them online, and they're really fine strings (even though they're not designed as such!).
The only modifications (NDLR pour l'accorder en LA) to make with the strings I recommended, would be:
1/ a lighter 1st string (normal tension E string), and;
2/ strings 5-7, which are D'Addario (or equivalent) J4404, J4405, NYL050W respectively. Lighter versions of the ones mentioned above.
The other strings work fine tuned up at standard pitch, only they become quite tense under the fingers. You can get used to that without too much problem.
The 8th string 'issue' is simpler here, as you can use an NYL060W (or equivalent), which is easily available.
One extra point: a guitar-making friend of mine, Martin Woodhouse, who has made over 30 Brahms guitars already, recently used an increased string-length spread: 60cms for the 1st string, to 66cms of the 8th. (My Rubio guitars go from 61.3 to 65.3.) Martin says that the results are improved, and that the added angle for the left hand is still perfectly comfortable. Maybe your maker has already some ideas of his own, too.
Je vous tiendrai au courant pour ma future guitare (ça fera peut-être l'objet d'un sujet dans la rubrique lutherie si j'ai des photos).