tuning with Dampp-Chaser

[James Baker]

I have 2 studio Yamaha pianos that move around alot in pitch after I open
them and I suspect the DC system.  On one, I removed the dehumidifier bar
and installed rear bars and a cover leaving the humidifier section inside
the piano.  It tunes like a champ now.

James

----- Original Message -----
From: "Charles Neuman" <piano@charlesneuman.net>
To: <pianotech@ptg.org>
Sent: Thursday, March 21, 2002 11:53 PM
Subject: tuning with Dampp-Chaser


> Any strategies on tuning when there is a D-C installed?
>
> When I open the piano, the humidity starts to change. After a while this
> affects notes I've already tuned.
>
> In my case, the humidity near the action of my vertical changes from 42%
> to 36%. After a half hour or so of practicing setting a temperament, my
> first notes have drifted a bit from where they were. I assume the humidity
> change is the problem, but I suppose it could be how I set the notes.
>
> Do people run into this problem? If so, would you recommend leaving the
> piano open for a while before tuning?
>
> Charles Neuman
>
>