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<P>I've got a similar Petrof, but smaller...5' 7" or so...same problem.=
It does seem, to me you're going to have a really low upwe=
ight...? Why not, as Dean wrote, remove weight from the ham=
mer?</P>
<P><BR>David Ilvedson, RPT<BR>Pacifica, California<BR><BR></P>
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Original message<BR>From: Erwinspiano@aol.com<BR>To: pianotech@ptg.org<=
BR>Received: 12/8/2005 10:40:48 AM<BR>Subject: Petrof Quality<BR><BR><F=
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<DIV align=left> Listers</DIV>
<DIV> After a recent encounter with a 10 year old 6 ft. Pet=
rof ,my once fairly high opinion of them has sunk. I generally have lik=
ed the sound of there bellies & the workamnship looked good but&nbs=
p; I had the following experience.</DIV>
<DIV> The action although upon examination had a nicely done 5.3 =
overall action ration the touch was extremely heavy high 60's down &=
; below 20 up. The problem is that the hammers were just way to heavy f=
or example Note 16 was 10.5 grams. That's hammer wt. not strike w=
eight.</DIV>
<DIV> So extrapolate those heavier than normal readings thru the =
rest of the scale.</DIV>
<DIV> Since the desired service was to make it play more like a S=
aturn than a truck & no parts were being changed the original=
parts were used. The remdey was to add one lead to a sparsely le=
aded keyboard & then adjust the wippen springs. Even at that =
the average down up weight was around 56 to 22 up which is a 39 balance=
weight.</DIV>
<DIV> I believe the real solution was a lighter set of hamme=
rs & subsequent even leading applied with springs detached to some =
higher than normal nominal number down/up numbers & then re -tweaki=
ng the springs. for a light bit of wippen weight removal from the syste=
m.</DIV>
<DIV> This to me was a prime example of a nicely done leverage se=
t up that was doomed from the git go due to extreme hammer weights =
;It seems all grand piano actions fall within certain reasonable =
& typical leverages that when exceeded are problematic until rectif=
ied by appropriate counter measures.</DIV>
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