Pitch Raise Experiment K&Cambell

[Farrell]

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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