[sdiy] Hammond Tuning

[dragons]

Hi,
I think the actual frequencies used in the production Hammonds are 
slightly different to the ones listed in the Patent.
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.
regards Peter

P.S it is a good point that some of the frequencies from the top octave 
generator chips are further out.

> Hmm, I'm finding it hard to believe.
> 
> The Hammond tonewheel tuning is determined by the ratio of the number of 
> teeth between pairs of gears, and those teeth number between 46 and 
> 108.  The details can be found in the original patent.
> 
> The result is that the Hammond tonewheel pitches are all within a spread 
> of 0.9 cents -- that's the peak-to-peak deviation from equal temperment.
> 
>