Hi RIchard, The SAT measures the difference between, in cents, the 4th and 8th partial on F3, the 2nd and 4th partial on A4 and the 1st and 2nd partials of C6. An optimum set of values would be a straight line, like 8, 7 and 6 or 7,7,7 or some such. I like to see a straight line but C6 no higher than 5 but that is rare. Now one "D" I had was 7,6,5, real nice numbers but it rose to 8,9.5,6 and it didn't tune quite as nicely as the previous numbers. This piano was used three our four times during a week during recital season, the ends of semesters. Those CAUTs know what I mean. I also had a concert hall piano I might tune three or four times a week, regularly, except during July and August. Same situation. THese pianos did end up getting master tunings stored in the SAT for repeat tunings. DOes that make sense to you? Regards, Newton Richard Brekne wrote: > > Newton Hunt wrote: > > > Hi Richard, > > > > I have seen the "A" of FACs change from 6 to 9.5 one one of my "D"s. > > That is significant in terms of the end result of the tuning. OCtaves > > are a little over stretched for my sense. SO yes, the change is > > significant to upset my tuning values. > > I guess I am not familiar with the SAT enough... what exactly the FACs > say....perhaps you can answer my query this way. Oversimplified... take the > first three partials... (fund, oct, oct+5) and say the relationship in > winter is 2.1 to 1 and 3.2 to 1. Is this basic relationship going to change > with a climate change going into summer ?? and if so does it do so > proportionally or not. Another words could the 3rd partial relative to the > fundemental change while the 2nd to the fundemental remain unchanged... or > something of that sort ? Newton > > -- > Richard Brekne > RPT, N.P.T.F. > Bergen, Norway > mailto:rbrekne@broadpark.no
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