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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