I agree with you, Richard.
The phase relationship between any two notes in real (tonewheel) Hammond
is totally random.
To answer the question from the similar group "Why we love Hammond organ
I performed phase measurements using digital storage oscilloscope on my
Hammond A100 made in 1964 during its restoration.
Still have video clips of those tests. The phase changing speed is totally
Depending on the phase changing speed and depth we can hear different sound
(phase shifter, phaser, chorus, flanger) in random sequence.
Add here the Doppler effects from connected rotating Leslie speakers and,
finally we can hear flying "Voice from Heaven".
You can see The Hammond restoration project in pictures on 3 pages of my
G e n n L a b
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Tel: +64 21 238 3056
----- Original Message -----
From: "Richard L. Hess" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, February 22, 2013 2:12 AM
Subject: Re: [ARSCLIST] a segue from wires to recordings of music performed
> Hi, Art,
> At one point I had a fleeting interest in Hammond Organs and acquired one
> used as another musical toy for our home...I don't really play, but my son
> Robert is studying music at the university level. Personally, I was
> fascinated with the technology of the Hammond Organ (but telegraphs have
> fascinated me, too), and I had never really dug into how they worked until
> my brief foray in 2010. I had always wondered why you had to oil them--I
> never realized they were electric, rather than electronic, instruments.
> Each tonewheel is a miniature generator (as in dynamo). One of the
> interesting things is that the tonewheels are friction coupled to the
> drive shaft and their spinning can be heard on power up. This provides the
> interesting property that the phase relationship between any two notes is
> totally random--I guess not unlike a pipe organ which is so temperature
> When I was interested in learning about Hammond organs, I found there were
> several communities on the Web that offered support for the addiction.
> One group I subscribed to in 2010 was
> [log in to unmask]
> You might ask there.
> On 2013-02-21 12:21 AM, Art Shifrin wrote:
>> I have a one hour wire of Porter Heath lecturing / demonstrating a
>> to a group of church organists, circa 1950. Might such musical &
>> contents be of interest to some group, collection, or institution? It
>> played through in real time in an uninterrupted & otherwise trouble-free
>> transfer to digits a few days ago & will remain tails out for posterity.
>> Art (Shiffy) Shifrin
> Richard L. Hess email: [log in to unmask]
> Aurora, Ontario, Canada 647 479 2800
> Quality tape transfers -- even from hard-to-play tapes.