humidity control

[Don Rose]

>We have been intrigued with this question of should I control the RH level of
>the concert piano in a box or room off stage by controlling the environment
>in the box or should I control it with a humidity control system in the
>piano.
>
>My thoughts on this are, control the piano because this system can be used
>right up to the start of the performance (or perhaps throughout the
>performance if one doesn't mind the extension cord).  It can llikewise be
>started again right after the performance leaving just a short period for the
>piano to gain or loose water.

I have data which indicated a 17 cent pitch rise in 20 hours when a Dampp-Chaser unit was
plugged in on a Steinway (6') Grand. The room RH was 4% measured with a Pschodyne (the one with
the electric fan).

Regards, Don Rose, RPT drose@sask.maple.net