Rear Duplex Bars on Steinways: was Baldwin Accujust...

[David Love]

Relocating was a bad choice of words, I was thinking that one might have to
raise the back end of the plate.  I can see with the addition of vertical
accuhitch pins this would be unnecessary.  Has the ideal backscale length
been quantified?

David Love
davidlovepianos@earthlink.net


> [Original Message]
> From: Delwin D Fandrich <pianobuilders@olynet.com>
> To: Pianotech <pianotech@ptg.org>; <davidlovepianos@earthlink.net>
> Date: 5/7/2003 1:11:17 PM
> Subject: Re: Rear Duplex Bars on Steinways: was Baldwin Accujust...
>
>
> ----- Original Message -----
> From: "David Love" <davidlovepianos@earthlink.net>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: May 06, 2003 9:12 PM
> Subject: Rear Duplex Bars on Steinways: was Baldwin Accujust...
>
>
> > This discussion reminds me of something that I have wondered about with
> > reference to rear tuned duplexes and the effect on backscale length.
> When
> > replacing a soundboard on a piano with aliquots, such as a Steinway, one
> > could, conceivably, reset the plate such that the rear aliquots could be
> > removed adding some backscale length to the treble and mid tenor.  Would
> > that added backscale length contribute anything to improving the tone,
> > i.e., is the backscale length on Steinways theoretically shorter than
one
> > would design it under ideal circumstances.
> >
>
> In some versions it is very short indeed. Our usual approach is to simply
> remove the back so-called 'aliquot bar' and use vertical hitches. If there
> is a desire to retain the aliquot bar for aesthetic reasons it is also
> possible to relocate it some further back. With a bit of grinding it can
> usually be placed far enough back to bring the backscale up to an almost
> reasonable length.
>
> Relocating the plate is not a easy as it looks. It requires plugging and
> drilling to relocate the nosebolts, grinding the bass end of the plate
> flange for clearance, relocating the action for strikeline, etc.
>
> Del