Simple physics: the strings are not uniform along their lengths, something that is actually difficult to achieve but something we have become accustomed to with newer more sophisticated methods of making strings.
A. John Mardinly, Ph.D., P.E. Retired Principal Materials Nanoanalysis Engineer On Feb 28, 2017, at 10:56 AM, Bruno Cognyl-Fournier <[1]fournier...@gmail.com> wrote: Dear Collective wisdom, I have been tuning my 5 and 6th course in octaves for years, with wound strings and gut or nylgut. recently I bought the CD loaded strings from Mimmo and am slowly getting used to them. I have thus replaced the fundamental with CD loaded, while keeping my octave strings in gut or nylgut, this on two different lutes. I have noticed that the octaves are horribly out of tune as I go up the neck, especially by the time you get to the 7th fret. I realize I rarely have to play up there, but it bothers me. Am trying to figure out what the problem is.. would it be a mismatch of tension? or would it be the Loaded CD strings, that as some of you have probably found to be very elastic. I have never had this issue with wound string/gut combinations. I will be testing each string individually to check which one goes out of tune as you move up the scale, but I suspect it is the Loaded string that is giving me the problem. any comments? Bruno -- To get on or off this list see list information at [2]https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cs.dartmouth .edu_-7Ewbc_lute-2Dadmin_index.html&d=DQIBAg&c=AGbYxfJbXK67KfXyGqyv2Eji z41FqQuZFk4A-1IxfAU&r=MAuGvnWTcVQkxORgQD0QS50ZicPM3Nw-61ygSK-LNEQ&m=7m6 qXHFLDq4UJWi-GfyPBtaiVJ_kFOn69VHw637ynDA&s=-7bGiiHqnFJB7nQpHaP75B_8t262 6BCzYNa0fBzEKa4&e= -- References 1. mailto:fournier...@gmail.com 2. https://urldefense.proofpoint.com/v2/url?u=http-3A__www.cs.dartmouth.edu_-7Ewbc_lute-2Dadmin_index.html&d=DQIBAg&c=AGbYxfJbXK67KfXyGqyv2Ejiz41FqQuZFk4A-1IxfAU&r=MAuGvnWTcVQkxORgQD0QS50ZicPM3Nw-61ygSK-LNEQ&m=7m6qXHFLDq4UJWi-GfyPBtaiVJ_kFOn69VHw637ynDA&s=-7bGiiHqnFJB7nQpHaP75B_8t2626BCzYNa0fBzEKa4&e=