Hi again Herbert, Martin, Arto et al.,
I have just spoken with the technician at Savarez. They are redoing
their website and hope to update their string calculator at some time
in the future.
In the meanwhile I managed to get some explanations regarding their
reference numbers for over-wound strings. They offer silver wound
strings (NFA), copper wound strings (NFC) and plastic wound strings
(NFP). I have never tried the latter but Savarez recommend them for
transitional strings on theorbo-necked instruments. I would be
interested if anybody has any feedback on them.
The numbers correspond to the PUL (linear density). For example, NFA
230 is a silver wound string with a PUL of 2.3 g/metre. The silver and
copper strings have different reference numbers because copper is
slightly less dense than silver and to compensate the inner core is
thicker so as to give the same tension.
One can calculate the tension with the following formula, making sure
to use the same units for SL and PUL (I hope I've got it right, I'm not
a mathematician by any stretch of the imagination!):
4 x the frequency^2 x string length^2 x PUL
This gives tension in kilos, for Newtons divide by 9.8
The technician gave me specific tensions for your baroque lute 9th
course fundamental (E at a'415):
NFA 230 gives 2.7 kgs
NFA 250 gives 3 kgs
NFA 275 gives 3.1 kgs
Strangely, when I do the calculations with his formula I don't get
quite the same results so maybe he was using a more complex formula (or
winding down for his afternoon nap).
I think Paul Beier's calculator is definitely the way to go for
simplicity's sake. Otherwise, why not use Kuerschner or Aquila, their
references use gut equivalent diameters and so are very straight
forward for tension calculations?
Anyway, one string down, 23 to go!
Best,
Matthew
On 25/04/2016 05:00, Herbert Ward wrote:
As an experiment, I put extremely light strings on my baroque lute.
This made the tone very difficult to control. This is pretty good
practice, but in a month or two I need to venture out of the house
with the lute.
So it's string buying time.
Can someone give me a Savarez PUL number for the fundamental of the
9th course (E) at AA5 with a 68.5 cm string length? Also helpful
would be an indication of whether the PUL corresponds to heavy, medium,
or light stringing.
Google searches gave nothing useful.
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References
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