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<DIV> Hi Terry</DIV>
<DIV> In most cases why would the weight in a large old upright be that
much different from a low medium hammer weight for a similar sized grands.
I also taper the treble as Joe suggested to get the weight down to something in
the 5 ish range but the strike weight for note A 0 sound too heavy JMO. I'd be
shooting for a hammer weight of about nine grams max.</DIV>
<DIV> Dale</DIV>
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<DIV><FONT face=Arial size=2>I am replacing hammers in an old upright. I have
a concern regarding hammer weights and how they follow (or rather don't
follow) the Stanwood curves. I have used Stanwood curves in the past to weigh
off upright hammers for tonal purposes - I realize it affects touchweight
minimally - although it does affect the inertia portion of
touchweight.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I have purchased a set of Isaac Credenza hammers
for the piano. SW for the A0 is about 10.8g - right in the lower end of the
midsection of Stanwood's curves, and probably about right for a smallish piano
(52"). SW with the Isaac C88 is 6.9g - right at the most extreme heavy treble
hammer on the Stanwood curves. I presume reducing treble hammer weight will
provide better tone for the piano (maybe not - I guess a 9-foot grand has a
similar speaking length?). As you can see in the picture below, the original
C88 core is a lot smaller than the Isaac - 1.7g compared to 2.9g. If the new
C88 hammer had a core like the original, that hammer weight would fall in
about the middle of the Stanwood curves - a much better match for the
bass.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I wonder how any Pianotech List participants
(and/or lurkers!) have addressed control of upright hammer weight in a
situation like this.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I don't have any similar new hammers where C88 is
much lighter to try to compare tone.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>And what the heck kind of wood was used on these
old actions? It is very dark right through - some kind of cedar (no pleasant
odor)?</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Thanks for any thoughts.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Terry
Farrell</FONT></DIV></FONT></BLOCKQUOTE></DIV>
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