Hello Rich,
that about a third of the way down, says:
"... Accurate imitation of the Hammond sound with simple electronic
circuitry was difficult, because the subtly-changing phase relationships
between tonewheels could not be easily replicated...."
OK, fair enough. :-)
Even with complicated electronics it wasn't. IIRC it was Suzuki-Hammond
which came out with the XK2 and then the XK3. Those are pretty elaborate
synthesizer organs. But according to the experts it just ain't the same.
Regards, Joerg
http://www.analogconsultants.com