Tuning a concert piano with humidity control

[Don]

Hi,

I would arrange for it to stay plugged in during the concert, or else add
an uninteruptible power supply (like the ones for computers) to it.

I'd add a bottom cover to the piano immediately. I recently measured a
5'10" (175 cm) grand. Room was 16% and humidity at the controller above the
beams was 18%. This was in a classroom so there was no lighting to deal
with. As a bonus, the instrument will also look esthetically more pleasing
with a bottom cover.

In an ideal world the piano would be under performance conditions (full
stage lights etc) for 8 hours before the tuning began.

At 10:32 PM 3/5/2005 -0500, you wrote:
>
>
>If a Dampp-chaser system is installed in a piano that is only used for
>concerts, what is the best schedule to observe for unplugging the
>Dampp-Chaser, moving the piano on stage, and tuning?
>
>Here is the problem I see. The Dampp-Chaser will maintain the piano at a
>fairly constant humidity, especially with a floor length cover over the
>piano. But when the piano goes on stage, the lid is raised, and the lights
>are on, the humidity as well as the temperature will change. I understand
>that the effect of temperature change, especially from the lights striking
>the strings is almost immediate, while the plate takes longer to warm up.
>The effect from the humidity change is much slower since wood takes longer
>to change its moisture content.
>
>As a practical matter, how soon before the concert should the Dampp-Chaser
>be disconnected, and the piano moved on stage? And when should it be tuned?
>
>Looking forward to your responses.
>
>Jerry Cohen, RPT
>NJ Chapter
>
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Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
Non calor sed umor est qui nobis incommodat

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