[CAUT] Baldwin Termination Bars

[Scott Nelson]

I have to confess that I didn't fully comprehend the alteration to the termination bars that Ron accomplished in his SD-10 rebuild. The schematic makes it perfectly clear. 
 
It looks like the duplex length has been cut down from from about 43-46 mm, depending on the type, to about 10 mm. Does the segment between the half-round and the front string rest still contribute to noise or is it no longer a direct function of the speaking length?
 
Also, is there any particular reason for choosing brass over some other insert, other than it being readily available?
 
Scott Nelson

--- On Sat, 5/9/09, Ron Nossaman <rnossaman at cox.net> wrote:

From: Ron Nossaman <rnossaman at cox.net>
Subject: Re: [CAUT] Baldwin Termination Bars
To: caut at ptg.org
Date: Saturday, May 9, 2009, 6:05 PM

> I am interested in the current discussion about the vertical hitches, and
termination bars in Baldwins.  I don't really know anything about the
termination bars, or how they work.  Colby College has one SD-10, and I assume
those things that look like upside down sleds are the termination bars (?) 

Yes, those are the termination bars.


> I've never seen anything that explains what they do or how they do it.
 

What they do is make noise. How they do it is by the resulting duplex segment
being too long.


> I have noticed that they are not all set the same, so I figure there is
some adjustment made with them as the piano is strung. 

There are two duplex lengths. The idea as I understand it is to not have the
front duplex tuned to the speaking length, so they wouldn't make noise.
They're easy enough to quiet with a restring, with the addition of a bass
half round that shortens the duplex.

Ron N
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