Pitch Raise Experiment K&Cambell

[Stephen Airy]

Ok, here's a question on how to do pitch raises
(provided the piano can take 440:)

Here's the methods I can come up with on how to do it
-- can anyone point out any errors in my ways?

up to 10 cents flat -- tune.
10 to 50 cents flat -- pull up with overpull, then
tune (2 passes)
50 to 200 cents flat -- pull up to pitch, then
overpull, then tune (3 passes)
200 to 400 cents flat -- pull to 1/2 step flat, then
to pitch, then overpull, then tune (4 passes)
400 cents flat or more -- pull to 1 step flat, then to
pitch, then overpull, then tune (4 passes)

Or, is it...

regardless of pitch (over 50 cents flat) -- pull to
pitch (even if 500c flat), then overpull, then tune (3
passes)?

--- Farrell <mfarrel2@tampabay.rr.com> wrote:
> I'm surprised no one has questioned this post.
> Terry, are you suggesting
> that you did a one pass pitch raise with overpull
> from 170 cents flat? If
> you start in the bass, the treble would be even
> flatter by the time you get
> there, so you were likely raising the treble from
> 200 to 250 cents flat.
> That would require an overpull of approximately 75
> cents. I think most
> opinion suggests that pulling a string more than
> about 25 cents above pitch
> may permanently damage the tonal qualities of the
> string.
> 
> In the future, with any piano more than about 50 to
> 75 cents flat - and
> certainly any piano 100 cents flat, you may wish to
> consider a first pitch
> raise pass only targeting pitch with no overpull,
> and then a second pitch
> raise pass (usually from 25 cents flat or so) with
> appropriate overpull.
> This not only helps to save the strings from damage,
> but also gets your
> rough tuning closer for the final tuning pass.
> 
> Terry Farrell
> 
> ----- Original Message -----
> From: "pianolover 88" <pianolover88@hotmail.com>
> To: <pianotech@ptg.org>
> Sent: Wednesday, January 09, 2002 9:48 PM
> Subject: Re: Pitch Raise Experiment K&Cambell
> 
> 
> > Did a HUGE pitch raise on a 60's Kohler & Cambell
> spinet that was as much
> as
> > 170 cents flat. hadn't been tuned in more than 20
> years. Luckily, the pins
> > and strings were surprisingly free of even a hint
> of rust. Pulled it
> > completely up to pitch in one pass, then fine
> tuned. Also removed action
> to
> > take to shop for hammer filing/reshaping. Brought
> it back, voiced it and
> it
> > sounded terrific! no broken strings, customer
> elated! Fun job too! Of
> > course, i informed the customer that her piano
> will need a follow-up
> tuning
> > in 2-3 months to stabilize it. She gladly agreed.
> >
> >
> > Terry
> >
> >
> >
>
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