[BC] Making Beautiful Music

[Mark Humphrey]

Yes, here's the tone wheel theory of operation:

http://b3world.com/hammond-techinfo.html

Note that the vibrato system uses a rotary switch, driven by the same
motor, which "scans" a delay line to vary the phase shift and produce
frequency modulation.  Analog engineering at its finest!

Mark

On Thu, Apr 3, 2008 at 2:08 PM, Milton Holladay <miltron at mindspring.com> wrote:
> Weren't they driven by synchronus motors, so they were always correct pitch
> ?
>  M
>  ----- Original Message ----- From: <RichardBJohnson at comcast.net>
>
>
> > The early vacuum-tube Hammond Organs had spinning tone-wheels