Open face vs. closed face pin blocks

Phillip L Ford fordpiano@lycos.com
Wed, 15 Aug 2001 15:53:13 0000


I'm not familiar with the Steinway Magic Circle.  Could you elaborate?
---
Phillip Ford
Piano Service & Restoration
1777 Yosemite Ave
San Francisco, CA  94124

On Tue, 14 Aug 2001 23:24:00  
 Richard Brekne wrote:
>Been following along this whole thread with lots of interest and couldnt help throwing into
>the wash (from afar and with a decided delay) that this whole line of reasoning begins to
>stir up that "Magic Circle" wash that a few of us have heard from the Steinway camp.
>
>I wonder tho, just how it is that energy leakage through the front termination, evnt.
>counterbearings, through the pins, into the plate via the pinblock is supposed to increase
>power. Would seem to me that such a leakage would be more an acoustical shunt then anything
>else. Anyone care to explain the "logic" of this idea ?
>
>larudee@pacbell.net wrote:
>
>> Another point to consider is that only a small proportion of the string energy is going
>> to reach the front flange and pin block area of the plate.  If everything is working
>> right, most of it will be absorbed through the bridge, and the next largest portion
>> partly reflected and partly absorbed by the capo bar.  Only a small remainder will get
>> through to flange and pin block.
>>
>> Even if it does work as intended, we need to remember that the tuning pins are 3 or 4
>> times farther above the pin block in a closed design and that string tension is
>> therefore exerting that much more leverage upon them.  To the extent that string energy
>> might be absorbed by the pinblock/plate in an open face design, wouldn't it be at least
>> as likely to be absorbed by the flex of the tuning pins in a closed design?
>
>--
>Richard Brekne
>RPT, N.P.T.F.
>Bergen, Norway
>mailto:rbrekne@broadpark.no
>
>
>


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