[CAUT] How long to stabilize??

[Richard Brekne]

Hi Andrew

One could think along those lines yes... and I'm not going to rule out 
their influence... but a couple facts (and I use the term without 
caution) annoy that conclusion. First, the back length frequency does 
not change in same manner as the speaking length. I've measured this 
several times and found on grands that the back length is quite stable 
in comparison to the speaking length. Secondly... the non-speaking 
length differences both vary from instrument type to instrument type and 
and this variance is not reflected in the pattern well tuned unisons 
display when start to go out of tune.

My attention is brought to the bridge itself, and the pinblock.

Cheers
RicB


    Speaking from an observational point of view without carefully 
    measuring; it seems that the opposite swing of the outside unison
    strings might be related to unequal string lengths between tuning
    and hitch pins.  Seems to me that this is one of the stated reasons
    for single string unisons a-la Bosendorfer et al.  Having a little
    experience with Bosendorfer, I am not certain that this holds up
    under  scrutiny, comparatively. The opposite would then be true of
    uprights  as well and I do note the swing in them, some more then
    others.

    Maybe someone has already investigated this and can lay these 
    questions to rest... ?

    Andrew Anderson