stability of pitch raises

[jolly roger]

Hi Paul,
              Just start at A0 and go like the clappers.  The machine does
the thinking for you.  I deviate slightly if the end of the tenor bridge is
very sharp compared to the rest of the piano.   Then I will lower the first
8 to 12 notes of the tenor first.  then start at A0.   I have found that to
be more stable, and less lightly to climb back up as much.
Roger


At 12:33 AM 9/2/01 +0200, you wrote:
>Hi list
>
>I also thought I had seen something Al Sanderson had written about starting
>a pitch raise from A0, and continuing onward and upward chromatically. I had
>always started pitch raise's with setting a temperament, and tuning as per
>normal as quickly as possible. Obviously the only way to do the chromatic
>pitch raise is with an ETD. Can anyone expand on the chromatic technique?
>
>If one starts at A0, you're adding whatever extra "tension" there
>would be that occurs from a pitch raise, to the "middle" of the soundboard
>first? If I'm correct in assuming that, would that have any effect on the
>outcome of the tuning? Also, one is adding tension to the frame in a
>different sequence to the way you would starting with the temperament. This
>should also have an effect?
>
>I mentioned this to an RPT ( the only one in the area ), and he said he
>hadn't heard of doing a pitch raise like this, which made me think I had
>misunderstood what I had read.
>
>Any comments would be appreciated.
>
>Paul Tizzard, Piano Tuner
>Cape Town
>South Africa
>
>----- Original Message -----
>From: "Z! Reinhardt" <diskladame@provide.net>
>To: "Pianotech" <pianotech@ptg.org>
>Sent: Friday, August 31, 2001 12:22 AM
>Subject: Re: stability of pitch raises
>
>
>> One person you might want to talk to is Doc Sanderson (Dr SAT himself) at
>> Inventronics.  He has done research on the effects of doing a pitch raise
>> "piecemeal" (start with a temperament, tune single strings, then pull in
>> unisons) versus "brute force" (crank all pins from one end of the piano to
>> the other).  If I remember correctly, he has found that the "brute force"
>> method [my terminology] results in more stable tuning at pitch using a
>> smaller overpull than would be necessary to do a "piecemeal" pitch raise.
>> He may have an explanation for this phenomenon.
>