Raising pitch 8-10 cents, using an ETD that calculates an overpull value:
I would like to get each string in its new position with as few movements as possible.As I begin to "load" the tuning lever, I feel the springy stress building in the pin and front string length, but the pitch has not moved.
[If I release now, the spring releases and the string stays stable at its original pitch, which has not moved.]
I add more effort to the lever, and the string begins to render and the pitch rises.
The ETD display changes as the pitch rises.
When it has just passed "right" and is begining to go "sharp" I release the tension I'm holding in the lever, and the pitch display drops a little. In my release I'm trying to feel the "undoing" of the destabilizing stress I needed to make before the string began to render.
Now the same thing happens as I tune the unisons by ear: move up to clarity, then a little bit of sizzle. then settle back.
This happens rather quickly. I would not call it a slow pull.
Tiny corrections, if needed, I now make by "nudge" or "lift and nudge."
But alas! where has my simple description gone?
Dan Levitan says it's really much easier to do than it is to talk about or think about.
Our hands and brains make a simple synthesis...until we try to put it into words.
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Ed Sutton
ed440@me.com(980) 254-7413
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Original Message:
Sent: 09-25-2017 08:29
From: Peter Grey
Subject: Tuning Stability
Susan,
In general I would tend to agree with you!
Pwg
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Peter Grey
Stratham NH
603-686-2395
pianodoctor57@gmail.com
Original Message:
Sent: 09-25-2017 02:00
From: Susan Kline
Subject: Tuning Stability
Hi, Ed
Well, how easy it is probably depends on how one goes about it.
First, how well can you avoid the destabilization while still moving the pitch?
Second, instead of using fancy hand work with analysis of flagpoling, pin bending, twist in the pinblock, etc., to reverse whatever "English" was put on the pin, how about minimizing the "English" by using abrupt impact instead of slow pull?
Third, let the wire find its new equilibrium by letting it go back out a little bit -- then come back after tuning a different part of the piano, and tune it again, with extremely minimal motion and firm but not brutal blows. Repeat ad libitum until it is stable in its new place. (i.e., multiple passes with as small adjustments as possible, and the last pass should be a tiny fraction of a beat.)
Well, that's my self-encouraging blather about the process, anyway.
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Susan Kline
Philomath, Oregon
Original Message:
Sent: 09-24-2017 23:32
From: Ed Sutton
Subject: Tuning Stability
When we arrive at the piano, it is almost always stabile; out-of-tune, perhaps. but usually quite stabile, especially if it has been played a lot.
As we begin to move the pitch, first we destabilize the string, then we move the pitch.
Now our job is just to put it back like it was before we moved it, but at the new pitch, i.e. let go of the instability we put in while moving the string.
Easy. yes?
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Ed Sutton
ed440@me.com
(980) 254-7413
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