[CAUT] mystery solved

[Alan McCoy]

One thing I discovered this summer is that pinning these brass half-rounds
in place before stringing is a good idea. They will have a tendency to move
back (toward the keyboard) if left unpinned, especially when the duplex
angle is steep, which is the case on a 1977 M&H BB. Per Ron's suggestion I
pinned them with center pins.

Alan

-- Alan McCoy, RPT
Eastern Washington University
amccoy at mail.ewu.edu
509-359-4627


> From: Ron Nossaman <rnossaman at cox.net>
> Reply-To: "College and University Technicians <caut at ptg.org>" <caut at ptg.org>
> Date: Sun, 16 Dec 2007 09:44:49 -0600
> To: <ilvey at sbcglobal.net>, "College and University Technicians <caut at ptg.org>"
> <caut at ptg.org>
> Subject: Re: [CAUT] mystery solved
> 
> 
>> I noticed today on a Steinway B and a Yamaha C5 that the duplex is tuned
>> about and octave above the pitch.
>> So the shorter bear bars will change that relationship...right?   The design
>> was they were supposed to be an octave higher?
>> 
>> David Ilvedson, RPT
> 
> Truthfully, I don't really care where they are "supposed" to
> be. They were cast into the plate in what I presume to be the
> position in which they were intended, and they aren't
> adjustable without grinding them off and substituting
> something else, so what I think of their positioning is pretty
> much a moot point when I can't change it. What I do care about
> are the extraneous whistles and squawks they too often produce
> to be called a feature. So given the owner's permission with a
> rebuild, I shorten and effectively de-tune all the front
> duplex segments, and all the duplex hassles magically go away.
> 
> Ron N