Leading Vertical Dampers

[John Ross]

Hi Ric,
Is there any way to determine, how close to the node the damper is
located?
In the earlier part of the last century, people liked this resonance.
If you press on the damper, and it makes no difference, then perhaps a
longer damper is also part of the answer. It will get you closer to
the moving portion of the wave.
Did I explain this clearly enough?
Regards,
John M. Ross
Windsor, Nova Scotia.
jrpiano@win.eastlink.ca
----- Original Message -----
From: "Richard Brekne" <richard.brekne@grieg.uib.no>
To: "PTG" <pianotech@ptg.org>
Sent: Monday, June 03, 2002 4:47 PM
Subject: Leading Vertical Dampers


> Hi folks
>
> I have decided to give this idea a try and see how it goes, and
thought I might
> both seek advice as to just how much lead to add to the dampers and
at the same
> time give a sort of before and after story of the action for
everyones
> edification.
>
> This action is from an approximately 70 year old  Rønish full sized
upright.
> Damper felt is origional, dirty but not crusty......should actually
do the job
> well enough but doesnt. Springs are on the weak side for sure, and I
think I
> will have to change centers on the lot... but I will know that
tommorrow. In
> anycase the whole piano sings through the damper system quite a bit
and for a
> good long time. Seems pretty evenly distributed through the whole
system but
> the bass is a bit more active then the rest predictably enough.
Still a
> noticeable drop in the problem when any section of the damped
strings is muted
> by hand.
>
> Anyways I thought about giving Dels advice a whirl on this one and
am asking
> for input as to how heavy the damper heads should be.
>
> RicB
>
> Richard Brekne
> RPT NPTF
> Griegakadamiet UiB
>
>