PitchLock couplers

[Cy Shuster]

The big question is, why couple only two of a trichord?  In the Journal
article, it says "to preserve the original tone quality" (picture caption).
So, what happens to the tone?  And why not use them on bichords?  (And
they're "designed for the right pair" of a trichord?  Even curiouser!).

--Cy "too many questions" Shuster--
Rochester, MN

----- Original Message ----- 
From: "Ron Koval" <drwoodwind@hotmail.com>
To: <pianotech@ptg.org>
Sent: Friday, January 30, 2004 9:12 AM
Subject: PitchLock couplers


> Ok, I've got them on one piano already here at school, and will put them
on
> another today.
>
> 1st - old Lyon & Healy grand in a group piano lab.  Probably not the best
> first candidate, the old strings didn't allow the clips to slide very
> easily, the poor rendering and loose tuning pins made the tuning a little
> difficult.  For you electronic tuning types out there, be prepared for a
> pitch drop when you bring the second string in tune with the first.
Kindof
> the 'Virgil effect', only bigger.
>
> 2nd  6' 1970's Baldwin in the choir room.  This one takes a beating and
just
> keeps going.  I have stability problems around D5, bridging the strut.
>
> Since the goal of the couplers is to minimize the effect of unison smear,
I
> won't be able to report back on how well they work for a while...
>
> Ron Koval
> Chicagoland
>
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