[pianotech] Soundboard deflection - Pitch raise

[David Ilvedson]

So stretching or maybe deforming of the piano wire itself is not involved in the pitch loss?

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: PAULREVENKOJONES at aol.com
To: pianotech at ptg.org
Received: 8/4/2009 3:20:10 PM
Subject: Re: [pianotech] Soundboard deflection - Pitch raise


>My answer was not a suggestion. It was a request for data to support your  
>contention.
> 
>P
> 
> 
>In a message dated 8/4/2009 7:26:02 P.M. Central Daylight Time,  
>davidlovepianos at comcast.net writes:

> 
>Are  you suggesting that soundboard deflection is the cause for the 
>predictable 25%  - 30% loss in the initial pitch correction even when that net 
>change is  similar whether pianos have no crown and no bearing or quite a bit of 
>crown  and ample bearing? 
> 
>David  Love 
>www.davidlovepianos.com
> 
> 
>From:  pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
>Behalf Of  PAULREVENKOJONES at aol.com
>Sent: Tuesday, August 04, 2009 2:46  PM
>To: pianotech at ptg.org
>Subject: Re: [pianotech]  Soundboard deflection - Pitch raise

> 
>And  unproved. David, where's the data?
> 

> 
>P
> 

> 
> 
>In a  message dated 8/4/2009 11:45:27 A.M. Central Daylight Time,  
>AlliedPianoCraft at hotmail.com writes:

> 
>Interesting.
> 

> 
>Al  G
> 

> 


> 
> 
>From:  _David Love_ (mailto:davidlovepianos at comcast.net)   
> 
>Sent:  Tuesday, August 04, 2009 10:05 AM
> 
>To:  _pianotech at ptg.org_ (mailto:pianotech at ptg.org)   
> 
>Subject:  Re: [pianotech] Soundboard deflection - Pitch  raise

> 

> 
>Not  board deflection but plate contraction is the culprit.    
> 
>David  Love 
>_www.davidlovepianos.com_ (http://www.davidlovepianos.com/) 
> 
> 
>From:  _pianotech-bounces at ptg.org_ (mailto:pianotech-bounces at ptg.org)   
>[mailto:pianotech-bounces at ptg.org] On Behalf Of Al  Guecia/AlliedPianoCraft
>Sent: Tuesday, August 04, 2009 4:19  AM
>To: Pianotech List
>Subject: [pianotech] Soundboard  deflection - Pitch raise

> 
>I did 2 pitch  raises yesterday (new customers). One was at A-418 and the 
>other was A-420  before I started. What I found interesting was the amount of 
>board  deflection. On one of the pianos (A-418), the first 3 notes (A-0, 
>A#-0  & B-0, were dead on, (go figure) on my first pass. I raised the pitch  
>to 440, (some notes on this piano were 190 cents flat, wow!). On my second  
>pass the first 3 notes were about 10 cents flat. I was surprised that the  
>board deflected that much. No question here, just an observation I thought  
>I'd pass on.
> 

> 
>Al G
> 

> 





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