Yamaha Duplex Scale

[Richard Brekne]

The only written reference I have seen on this subject (though no doubt there
are others) is Ed McMorrows book "The Educated Piano". There is a fine
description on how and why the front duplex is tuned and how this relates to the
Capo Bar profile. Tho the subject matter is disputed by some, and undoubtably
there are more ways to approach the subject matter then Ed would have it, his
book is interesting reading, and will provide you with a fine approach to tuning
(or de-tuning as he refers to it) the front duplex.

Curioius... why where you trying to tune the duplex on a C5?

Richard Brekne
I.C.P.T.G.  N.P.T.F.
Bergen, Norway

Brian Henselman wrote:

> I tried tuning duplexs once on a C5, and couldn't get them to budge.  Ok, so
> I let down the tension and pulled on set of duplex (THEY ARE PINNED TO THE
> PLATE!).  At least this 15 year old C5's was!  There was a hole drilled into
> the plate and a little guide nipple on the back of the duplex plate.  I'd
> call and comfirm that they are moveable.  This set wasn't!
>
> Be careful-
> Brian Henselman, RPT
> musicmasters@att.net
> Austin, TX
>
> >>List,
> >>
> >>This may be a stupid question, but what are the correct pitches for a
> >>Yamaha duplex scale?
> >>
> >>Mark,
> >
> >No, not stupid at all, but it may be un-answerable. What are the correct
> >pitches for any of the unisons in Yamaha pianos, other than A-4? The rear
> >duplex is theoretically supposed to be some partial of the speaking length
> >to sing along and augment the overall sound. "Tuning" them may help, at
> >least some folks think so, but it's really not possible to keep them in
> >tune with the speaking length. There's about a week's worth of reading in
> >the archives on the subject if you want the gory details. Del also
> >published an article in the Journal on the subject that sums it up more
> >succinctly. As for the Yamaha specifically, measure them and compare
> >against the speaking lengths. Then do the math. Or pluck and ponder.
> >
> >
> >Ron N