Pitch Raise Percentage

[Paul McCloud]

Phil:
	I have had the same experience with my SAT I.  Here's what I do.
In the bass, I measure A2 and divide by 4 and raise the pitch.  I tune
the whole bass with this amount.  When I get past the break, I reset the
machine to zero and measure any wound strings, divide by 4, etc., and
tune.  Then I reset again to zero and measure some plain strings, maybe
4 or 5, to find one that's average.  Then I use this to measure.  I'll
divide by 3, but not add the full amount.  Suppose the notes are about
18 cents flat.  I might add 5.  I've found that if I add the full amount
(in this case would be 6), I end up sharp when it's all done.  I will
measure 2 or at most 3 times in the tenor area.  But I won't add the
full amount. If I reset too many times, it tends to end up sharp.  Past
the tenor/treble break, I'll add the full 33%, and measure every 6 notes
or so.  If I see the lights are getting faster all of a sudden, I'll
reset there.  Then when all is done, I'll do the unisons.
	This is my method, though it took me years to get to this point.
I hate going back and putting the pitch down.  It takes me a lot longer
to finish the piano, and is very frustrating.  I guess you're at the
same spot.
	I hope this helps.
	
	Paul McCloud
	San Diego

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Philip J Ryan
Sent: Wednesday, February 04, 2004 6:02 AM
To: Pianotech
Subject: Pitch Raise Percentage

I did a pitch raise on a 30 cent flat piano yesterday with my SAT (25%) 
recalculating it several times along the way.  I ended up with a very
sharp 
piano.  After bringing it down with the fine tuning, it crept back sharp

again and I ended up leaving it a little sharp. (Not a bad thing)
However, 
does anyone have a rule-of-thumb for calculating a pitch raise
percentage 
that will leave it close to A-440? Are there variables to be considered 
such as size of piano, age, condition of piano/strings, etc. other than
the 
obvious?   I would love to hear what others do in this situation.

Phil Ryan


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