Wierd Pitch Raise Results

[Don]

Hi Terry,

Most of the laminated boards also have full perimeter metal plates--it is
the plate flex that makes the difference not the laminated board.

At 08:25 AM 2/8/02 -0500, you wrote:
>Thank you. That's an interesting thought. I'll have to pay closer
attention to laminated boards. Yes, this one had a hunk of plywood down there.
>
>Terry Farrell
>  
>----- Original Message ----- 
>From: "Patrick C Poulson" <pcpoulso@pacbell.net>
>To: <pianotech@ptg.org>
>Sent: Friday, February 08, 2002 12:29 AM
>Subject: Re: Wierd Pitch Raise Results
>
>
>> Terry: Check to see if the piano has a laminated sound board. In my
>> experience a piano with a laminated board needs significantly less over
>> pull.  I assume that this is because the board itself is stiffer due to the
>> cross grain and layers of glue, and doesn't flex as much as a solid board.
>> I also use a SAT, but in these cases I modify my pitch raise technique.  In
>> the middle section, rather than tuning the unisons as I go, I mute off the
>> strings, pull just the center strings up to pitch up throughout the tenor
>> section, and then go back and pull in the unisons.  The upper treble and
>> bass I tune as usually. This usually brings the pitch raise in as close
as I
>> typically get normally.  I also use this procedure on spinets and it works
>> well on them too.
>>     I hope this helps. Patrick Poulson, RPT
>> ----- Original Message -----
>> From: "Farrell" <mfarrel2@tampabay.rr.com>
>> To: <pianotech@ptg.org>
>> Sent: Thursday, February 07, 2002 8:50 PM
>> Subject: Wierd Pitch Raise Results
>> 
>> 
>> > Half the piano I tune require a significant pitch raise. I do a lot of
>> pitch raises. I use a SAT III. Almost all my pitch raises come out really
>> close to target.
>> >
>> > BUT. Some don't. Today I pitch raised three pianos. An Aeolian spinet
>> (what junk!) was raised 30 cents - came out real close to target. A German
>> F. Weber old upright - raised 80 cents and came out right on target.
>> Yesterday I did 60-cent pitch raises on six P22s (and tuned them - new
>> tuning output record for me! - also a new one-day income record for me! :-)
>> !!) - all came out right where I wanted them.
>> >
>> > I also pitch raised a 1973 Kimball console today. The piano was all over
>> the place tuning-wise, but was only about 5 to 10 cents flat on average. I
>> made the small pitch offset correction as usual with the SAT, and after the
>> pitch raise pass, the ugly son-&%-$-$#%&@ was a good 15 to 20 cents sharp.
>> WHY? I went through it again without any pitch correction (the piano should
>> have ended up perhaps 5 cents sharp) and every thing was like at least 10
>> cents sharp!
>> >
>> > Is this like some loosey goosey piano or what? Was I having an acid
>> flashback? I takes a lot to get me riled up while working on a piano, but
>> this one pushed me close to the limit.
>> >
>> > Ever see anything like this, or is it more likely that I was just tired
>> and screwing up big time?
>> >
>> > Thanks.
>> >
>> > Terry Farrell
>> >
>> >
>> >
>> 
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