Piano Warrenty/False Beats

[Farrell]

> Try taking the worst of the unisons and use the CA on the bridge pins.  If
> that takes care of the problem on that unison, I think you'll have a
little
> more concrete evidence that it really is loose bridge pins,  (probably is,
> but another little test or two can't hurt,)  and it would probably give
you
> a more solid leg to stand on when the 'factory rep' (or whoever) is on the
> other end of the phone saying, "Are you SURE it's loose bridge pins???".

I see your point Brian, but I wouldn't want to attempt ANY repair
(especially one that could be identified) prior to contacting the
dealer/manufacturer regarding the problem. I don't think there is anything
goofy going on regarding pressure on the board either, the false beats stop
with just light pressure on the pin.

Terry Farrell
Piano Tuning & Service
Tampa, Florida
mfarrel2@tampabay.rr.com

----- Original Message -----
From: "Brian Trout" <btrout@desupernet.net>
To: <pianotech@ptg.org>
Sent: Sunday, January 14, 2001 9:43 PM
Subject: Re: Piano Warrenty/False Beats


> Hi Terry,
>
> I did have one more thought when I read your reply and Don's post.
>
> Something you could try...
>
> Try taking the worst of the unisons and use the CA on the bridge pins.  If
> that takes care of the problem on that unison, I think you'll have a
little
> more concrete evidence that it really is loose bridge pins,  (probably is,
> but another little test or two can't hurt,)  and it would probably give
you
> a more solid leg to stand on when the 'factory rep' (or whoever) is on the
> other end of the phone saying, "Are you SURE it's loose bridge pins???".
>
> The only other thing that comes to mind that could cause those false beats
> to disappear would be your further loading the soundboard by the downward
> pressure on the bridge pin (changing the soundboard impedance)... but
that's
> a pretty big can of worms for a guy such as me.  It did come to mind
though.
> In such a case, something like mass loading in the bridge might make a
> difference, but I'm not sure I want to go any farther with that one just
> now.  I would also suspect that this type of problem would be a little
more
> universal to certain sections as opposed to the odd string here and there.
>
> Just more ramblings from the peanut gallery!  :-)
>
> Take care,
>
> Brian Trout
> Quarryville, PA
> btrout@desupernet.net
>
>