[CAUT] damper chirp

[Becker, Lawrence (beckerlr)]

The left string is not in phase with the two vibrating strings.  I have
seen/heard that with Baldwins, too.

Lawrence Becker, RPT
Piano Technician
College-Conservatory of Music
University of Cincinnati
-----Original Message-----
From: caut-bounces at ptg.org [mailto:caut-bounces at ptg.org] On Behalf Of
geinert at drtel.net
Sent: Thursday, March 13, 2008 9:15 AM
To: caut at ptg.org
Subject: [CAUT] damper chirp

Last night I was at a Bosendorfer Imperial I service.  A couple months
ago I 
regulated and voiced it.  Last night, when played with the shift pedal,
whenever 
the dampers were lowered they would chirp.   It was not completely
unlike what 
a glazed damper sounds like, but these are pretty new, and definitely
not 
glazed.

When I had regulated this, too  bright/not enough warmth were the
complaints.  
When voicing una corda, even though I know Bosendorfer does not set the
shift 
to clear the left string I did it anyway.  I tried to figure out why not
to at the time 
and couldn't come up with a reason.  Last night when the dampers were 
chirping, I checked right away to see if the clearing string was the
problem, and 
it was.  Setting the action shift back to put the strings between the
grooves and 
the chirp went away.

I am interested to hear theories of why that would  be.  No other piano
I have set 
with the left string to clear when the action is shifted does this.(that
I know of 
anyway)

Tim Geinert