[sdiy] Hammond Tuning

[Donald Tillman]

On Apr 10, 2010, at 1:29 PM, dragons wrote:

> I think the actual frequencies used in the production Hammonds are  
> slightly different to the ones listed in the Patent.

Indeed, the patent is different than the production organs.   The  
numbers I used for my analysis were more modern.  And they're the same  
as here:

   http://www.electricdruid.net/index.php?page=info.hammond

and here:

    http://www.dairiki.org/HammondWiki/GearRatio


> some of the early Hammonds had an additional bank of tone wheels  
> that could be switched in to give a chorus effect. this was before I  
> think they developed the vibrato scanner.

True.   Also the chorus tonewheel bank provided pitches slightly above  
*and* below the main tonewheels:

   http://www.dairiki.org/HammondWiki/ChorusGenerator

   -- Don

--
Don Tillman
Palo Alto, California
don at till.com
http://www.till.com