Pure Sound (was A 435 or A 440 ?)

[Stéphane Collin]

Hi Gene.

I suppose that the long bridge on that Knabe makes a "hockey stick" shape in the tenor section (reducing the speaking lengths in that area compared to the logarithmic progression).  Is it so ?
In pianos with plain wire trichords on the tenor end of the long bridge (did I understand that this is your intend ?  replace the long bridge wound bichords by plain trichords ?), the use of shorter speaking length induces a drastic drop in tension for those wires, causing an increase of inharmonicity.  My understanding (following Wolfenden) is that this is meant for the tenor end of the long bridge's notes inharmonicity to meet that of the high notes on the bass bridge, ensuring a smooth transition between the two bridges.  I understood that many redesigners on the list don't like that drop in tension and try to bypass the need for it.  
How do the wound bichords on the long bridge sound ?  Too much inharmonicity ?  Maybe the Pure Sound trichords could be a good idea there, as you suggest.  But if they sound better, wouldn't the transition between those and the bass bridge be more obvious ?  And also, the volume of the Pure Sound notes would be a concern.  Maybe choosing a thicker gauge would help.

Just my 2 euro cents thoughts.

Best regards.

Stéphane Collin.


----- Original Message ----- 
  From: Gene Nelson 
  To: Pianotech List 
  Sent: Wednesday, July 26, 2006 10:13 PM
  Subject: Re: Pure Sound (was A 435 or A 440 ?)


  Stephane,
  Thank you very much for this information.
  I do not have any experience with Pure Sound but had entertained the idea of using it in place of wound bi-chords in the lo-tenor of a 5'8" Knabe rather than try to get a string maker to wind the ultra small wrap or make a 3rd bridge.
  Sounds like I could indeed get a bit more tension and less inharmonicity. 
  Any thoughts?
  Regards,
  Gene Nelson

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