Perimeter Plates, was Re: Wierd Pitch Raise Results

[Patrick C Poulson]

Don: Is this true of Kimball consoles? I do not recollect them having full
perimeter plates, but I don't have one on hand to double-check that
----- Original Message -----
From: "Don" <pianotuna@accesscomm.ca>
To: <pianotech@ptg.org>
Sent: Friday, February 08, 2002 8:09 AM
Subject: Re: Wierd Pitch Raise Results


> 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
> >> >
> >> >
> >> >
> >>
> >
> >
> >
>
>