DC

[Don]

Hi Jonathen,

Your post does not provide details about the costs of such a unit. I
suspect that in a forced air home which is what most northern climates have
such a unit would far exceed the cost of the piano. I also doubt that
humidity could be kept within 5% on a year round basis. My research
indicates that a 5% change in humidity causes a one hertz variation in
pitch at A4--and far more than that at the bass break. It also "smears" the
unisons. I could live with + or - 4 cents at A4 but can't live with what
happens to the octaves at the break. 

My results with damppchasers with back covers and bottom covers are less
than 2 cents pitch change on any note over a one year period. (Assuming
piano is stablized). This is not an opinion, it is a documented history on
more than a "few" pianos.

What part of the country do you live in?

At 02:57 PM 2/12/2003 -0700, you wrote:
>Don,
>
>I just meant that there are other options such as climate control.  I
>know a lot of this depends on the climate, but where I live, I have seen
>better results with whole house humidification than I have with DC
>systems.  And when I say whole house humidification, I don't mean the
>"water wall" method which relies on the furnace.  I mean a high quality,
>steam generating humidification system.  It is my opinion that (at least
>in this climate) these systems produce more of a stable environment than
>the DC system.  And from measuring RH levels under the piano, they offer
>a much more consistent solution.  Again, I haven't had experience with
>this all of the country, so I'm not making a blanket statement.
>
>Also, as already mentioned, the unit is pretty useless if it isn't
>filled.  Unfortunately, this is often the case.
>
>
>Jonathan Finger RPT.
>
>
>
>-----Original Message-----
>From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
>Behalf Of Don
>Sent: Wednesday, February 12, 2003 2:49 PM
>To: Pianotech
>Subject: RE: DC
>
>Hi Jonathan,
>
>Would you care to elaborate?
>
>At 09:57 AM 2/12/2003 -0700, you wrote:
>>There are also options which will not create a
>>gradient in the way DC’s (at least in my experience) do.       
>>Jonathan Finger RPT       
>
>Regards,
>Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.
>
>mailto:pianotuna@accesscomm.ca
>http://us.geocities.com/drpt1948/
>
>3004 Grant Rd.
>REGINA, SK
>S4S 5G7
>306-352-3620 or 1-888-29t-uner
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>
>
>_______________________________________________
>pianotech list info: https://www.moypiano.com/resources/#archives
>
>

Regards,
Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T.

mailto:pianotuna@accesscomm.ca
http://us.geocities.com/drpt1948/

3004 Grant Rd.
REGINA, SK
S4S 5G7
306-352-3620 or 1-888-29t-uner