[pianotech] pitch of a piano

[tnrwim at aol.com]

the strings heat up and go flat.  


I think this is where the difference in opinion comes from. Strings themselves will go flat when heated up. But when the whole piano is heated, which causes the soundboard to expand, the pitch will go up. 

Wim 

 



-----Original Message-----
From: David Nereson <da88ve at gmail.com>
To: pianotech <pianotech at ptg.org>
Sent: Sun, Feb 24, 2013 9:59 pm
Subject: Re: [pianotech] pitch of a piano


Yes, that's what I've experienced -- sharp when cold, flat when warm.  I worked at a piano store where the grand in the south-facing show window, with its lid up, received the full effect of all-afternoon sun, and would drop in pitch dramatically, even if recently tuned.  
     Not thinking ahead, and wiith the action in the piano, I've used a heat gun in uprights to warm shanks for correcting the hammer angle.  If too many are done in the same area, the strings heat up and go flat.  
     I've read that pipe organs, and brass wind instruments (I don't know about the woodwinds) do the opposite -- flat when cold, sharp when warm.  
    --David Nereson, RPT


On Sun, Feb 24, 2013 at 9:16 PM,  <Jlmatt at aol.com> wrote:


No Wim and Marshall, it's the opposite!  Read what you wrote before you click "send"! 
 
Jean-Luc
 

In a message dated 2/24/2013 6:47:43 P.M. Mountain Standard Time, tnrwim at aol.com writes:
  
Yes, Marshall, the pitch of a piano does   go sharp when the temperature rises, or goes flat when the temperature drops.   You understand, of course, only if the temperature in the room in which the   piano is goes up or down. The pitch also goes up or down depending on the   humidity level in the room. 
  
 
  
Isn't this something sort of basic that your learned in school? So why do   you ask?
  
 
  
Wim
  
  
  
 
  
  
  
-----Original   Message-----
From: Marshall Gisondi <pianotune05 at hotmail.com>
To:   pianotech <pianotech at ptg.org>
Sent: Sun, Feb 24, 2013 3:28   pm
Subject: [pianotech] pitch of a piano

  
  
Hi Everyone,
I thought the pitch of a piano rises when the temp rises or goes   sharp and when it's cold goes flat?  
Marshall


Marshall Gisondi
MARSHALL'S PIANO SERVICE
215-510-9400
http://www.phillytuner.com   







 
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