So I am reading that "run-out" is considered to be inferior for the wood. I recently saw an expensive guitar for sale where the top looked stranger than I had ever previously seen. I then found out it was caused by run out. It was presented as though this was a good feature and desireable. Was that right?
Hi Craig, to me it's an aesthetic thing only. I really can't say if it has any effect on sound or not. I had posted the following in the past at some time already, it is from Bob Taylor in their Wood&Steel magazin, Volume 69. I found it a pretty good explanation of "runout".
"...The tree twists round and round, almost like the stripes on a barber pole. Some trees do this. Some have a lot of twist, some have a little, and a rare few have none at all. Those are the prized trees, but there aren't many left in the world.
So, you pick the tree with the least twist.
Now, you cut that log into two-foot length and split wedges from it to saw tops from. The wedges naturally have twisted face. I hope that makes sense. Now you saw a straight piece off the face of that split wedge. What you'll have is some grain running out the face of your cut because you saw cut a straight surface right through the twisted surface. Now cut a sister piece, the book-matched second piece of your top, and open it up like a book and glue the two together. When you look at that top, there is grain running slightly out of the face of both halves, but at different angles, so it catches the light differently. Look at your guitar and make a mental note of which half is lighter, and then rotate it 180 degrees, like from right side up to right side down, and you'll notice that now the other half looks light. We call that "runout", and it's pretty normal. We allow up to about a half-inch of twist per foot of length of the tree trunk, and that will make a good guitar."
So those runout tops are exactly bookmatched, however due to the natural twist in the wood this visual effect happens when you "open the book". So it seems a matter of fact that top wood without twist becomes so rare in future that they might keep it only for custom shop or high end models. Hence you also see many Martin high end guitars with runout now.
I also prefer guitars without runout, but it is only a aesthetic thing and should have nothing to do with the sound. But it might be a matter of "you get what you pay" in future when buying new, or you find the used models that used "better" wood. Kind of what you see with Brazilian rosewood on guitar backs. The old guitars have very straight lines in the wood, the new guitars have all kind of wood figures and are less that perfect bookmatched even if they come exactly from the sister piece of wood, since the wood runs out in all directions.
See also here, Frank Ford usually also explains things very visible:
http://www.lutherie.net/frankford.runout.html
Frank's last sentence sums it up pretty well: "
The matter of grain runout is largely a cosmetic one, and most builders try to avoid runout if possible." But like we learned with Ebony or Brazilian Rosewood, in the future those kind of woods might be so rare that changes will have to happen.
Ralf