No Power Yamaha revisited

[Richard Moody]

All the more reason to make the key bed strong enough to roll the
piano over using the lyre.    ----rm



----- Original Message -----
From: <A440A@aol.com>
To: <pianotech@ptg.org>
Sent: Monday, May 26, 2003 8:48 AM
Subject: Re: No Power Yamaha revisited


> Bill writes:
> >I agree that a good healthy blow will put the frame under
pressure,
> >but if the BR doesn't have anywhere to go (because the glides
are
> >contacting the bed),
>
>   I have been wondering when somebody is going to mention the
entrainment of
> the keybed?  Once the glides are in contact, the action cannot
move, UNLESS
> the keybed is not absolutely rigid.  But we know the keybed
isn't.  This is
> easily seen by depressing the pedals under a very lightly bedded
set of glides and
> observing them to lose contact with the keybed.
>    So,  the extra power and tone being ascribed to heavier
loading on the
> glide buttons may possibly be a function of preload on the
keybed?  And the
> observed differences between makes of pianos may be more due to
the differences
> between keybed strength than the flexibility of the balance
rails??
> Wondering,
> Ed Foote RPT