rim supported soundboards tesnion resonator rods

[Richard Moody]

----- Original Message -----
From: Delwin D Fandrich <pianobuilders@olynet.com>
To: <pianotech@ptg.org>
Sent: Tuesday, February 06, 2001 10:24 AM
Subject: Re: rim supported soundboards tesnion resonator rods



> Never the less if M&H did design a rim to support the
> sound board arch the concept was at least given a try. The interesting
part of
> the debate to me is whether this is an efficacious way of maintaining the
crown.
> I am not sure anyone knows, unless they are/have actually used it.

It's easy enough to test. Make a test fixture emulating the grand rim and
check it out. You'll not be the first to have done so.
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Me do it?  Not yet, that is why I posted the question here. You know, "research
first".  I would rather wait for a M&H with a TR that needs restringing and see
if adjusting the bars actually makes a difference.  So if anyone has tweeked
a TR with measureable results I would be interested.  Or audible results even.
; )
    Besides there is that famous M&H (?) demo model, the one with a piece of
soundboard with a tuning fork attached in the middle.  When the thumb screw
(acting as a tension resonator bar) is tightened forcing a crown (the board to
bow) the fork suddenly sounds louder.   This I speculate a young Mr Gertz heard
and came up with idea of the tension resonator. Of course if a proportionate
amount of the arch of the demo were put into a piano the crown might be a LOT
more than it is.  ---ric
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