Young Chang Duplex Noise

[sigurd hanson]

I Agree that using felt to cut out the duplex zinging will cut the tone down
much to much. I tried everything with a Steinway D.  I applied a little VJ lube
and it didn't kill the tone as using the felt and it totaly elimated the zing.

Sigurd Hanson, Registered Piano Technician
ufdanotes@writeme.com

atonal@planet.eon.net wrote:

> Don Mannino wrote:
> >
> > The problem can be helped considerable through proper voicing. Level the
> > strings carefully, seat the hammers carefully, then needle & shape the
> > hammers for a little softer attack.
> >
> > Inserting felt to cut the duplex noise works, but it also cuts the singing
> > ability pretty dramatically. Voicing the hammers and getting the owner to
> > accept a little of this sound is the best answer - most fine pianos have
> > some sound from this area, and good voicing should bring this piano into
> > line with others.
>
> Some months back I was frustrated with this duplex zing on a Baldwin
> L 6'3". I posted to the list and received many responses on the
> subject. The only acceptable compromise - and this was after a full
> week of trying everything - capo bar filing, string and hammer
> replacement, voicing, tuning, levelling, strike point adjustment,
> bridge pin and string seating, glue, nail polish, felt punchings on
> the duplex strings, and finally,  Accu-Just pin adjustment (after
> consulting Kent Webb) - was to weave a thin piece of flange bushing
> cloth through the duplex, using  enough cloth to cover six notes at
> a time. This achieved two results: 1) it dampened, rather than
> eliminated the duplex, partially because of the thinness of the
> cloth, and also, the shorter cloth sections could be slid back and
> forth along the duplex to find the optimum area of  noise dampening
> and partial re-enforcement. Result # 2 is that this is a totally
> removeable system, and can be un-done in seconds!
>
> Happy Sunday all,
>
>
> Rob Kiddell,
> Registered Piano Technician, PTG
> atonal@planet.eon.net