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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