humidity/CAUT

[Don]

Hi Mark,

I would suggest that you add back covers to all uprights. You will find a
dramatic improvement in tuning stability if you do this. 6 mil poly works
very well--attach it with staples and use duct tape to prevent the staples
from pulling thru the plastic.

At 11:35 AM 04/25/2000 -0500, you wrote:
>
>Last year we upgraded all systems here; 50 watt dehumidification for
>verticals, 50 plus 25 for grands, and double tanks for the concert grands.
>
>According to the tables, this should move our "climate" status up from .70
>(wild season swings) to 1.0.  In reality however, we still do have some
>instruments that fluctuate (seasonally) by as much as 15-20cts, still
>requiring pitch correction (increased workload) before tuning.
>
>The dampp-chasers have made an enormous impact on the stability of tunings
>throughout most of the year.  It would be inaccurate to say the systems have
>neutralized the effects of our climate (from .70 to 1.0) though.  However,
>the pitch deviation from season to season has decreased dramatically.
>
>BTW, I've two clients whose pianos (both verticals equipped w/ 5PS50's)
>would still swing up to 40cts between seasons.  I've documented this through
>pitch corrections, system upgrades and component tests over the last ten to
>twelve years.  A year ago I supplied both clients with the Mylar
>"back-covers."  On my recent tunings I am pleased to note, both pianos for
>the very first time, were within 4 cents of pitch.
>
>In the practice of "good" science, I will continue to monitor these pianos,
>but am somewhat ready to go out and by a 300' roll of the stuff for the
>University!
>
>Comments?
>
>Mark Cramer, RPT
>Brandon University
>
>
>
Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

Tuner for the Saskatchewan Centre of the Arts

drose@dlcwest.com
http://donrose.htmlplanet.com/

3004 Grant Rd.
REGINA, SK
S4S 5G7
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