Crown,

[Roger Jolly]

>To: pianotech@ptg.org
>From: Roger Jolly <baldyam@sk.sympatico.ca>
>Subject: Re: Crown,
>In-Reply-To: <3590BC71.1050@cmich.edu>
>References: <3.0.5.16.19980623180809.2c7fa080@mailhost.sk.sympatico.ca>
>
>Hi Mike,
>         You have just reinforced my gut feeling. The L seems to produce
the best harmonic package and duration of sustain on this model at about
.010" measured with the supply house 3 legged dial gauge, or 1.5 degrees
deflection when measured with a compound gauge.
>  The factory seems to set them at .025" and I have readjusted some
mishaps that were set at .065" producing some dramatic results. General
experience over the years with rebuilds ect. I'm happiest when the
deflection is about .020" in top treble going down to ,010" through the
centre section, measured when the piano is at pitch. It seems that energy
transfer is at it's best, and the loading is not too excessive so the board
really sustains.
> Perhaps Del can jump in with some pearls of wisdom, being the resident
expert on loading and impedence.
>Regards Roger
>
>
>
>At 08:44 AM 6/24/98 +0000, you wrote:
>>Hi Roger,
>>   Downbearing barely exists if at all in the whole midrange using
>>several different tools to analyze.  Downbearing is strong at the lower
>>end of the bass bridge decreasing  as you go up.  The treble bridge has
>>good positive downbearing in the top section which disappears about half
>>way down, and reappears slightly near the bass break.   Yet this old
>>board with no crown, cracked, etc has a strong solid tone and aftersound
>>thoughout with good sustain. 
>>-Mike Jorgensen
>>
>>
>>> Hi Mike,
>>>            I would be interested in your comments on the bearing of this
>>> instrument, I have experienced a notable loss of power and sustain when
>>> this model has excessive bearing.
>>> Regards Roger
>>> 
>>> At 08:43 AM 6/23/98 +0000, you wrote:
>>> >Hello all,
>>> >
>>> >    Of my bunch of Baldwin Ls,  #141142 is my favorite and shows ZERO
>>> >crown on the board and a crack. This L has good hammers and a powerful
>>> >tone throughout its' scale and an astounding bass.  I have heard that
>>> >bass tones improve when crown is lost.  This makes me wonder why we
>>> >worry so much about crown, especially in smaller sizes where the bass
>>> >would seem the ruling grade in the quality.
>>> >
>>> >-Mike Jorgensen
>>> >
>>> >Method I used for checking crown-- I stretch a thread along the board
>>> >next to the longest rib and look for space between thread and board.
>>> >
>>> >
>>> Roger Jolly
>>> Balwin Yamaha Piano Centres.
>>> Saskatoon/Regina.
>>> Canada.
>>
>>
Roger Jolly
Balwin Yamaha Piano Centres.
Saskatoon/Regina.
Canada.