From pjgee@emptysquare.com Wed Aug 16 20:26:34 2006
Subject:Re: New clone ? (B-Free)

Where / when did this idea of "clutch" start? I've seen it mentioned several
other places as well as here. It is pretty clear from the design diagrams
and notes that each tone wheel has a damped spring connection to its drive
shaft -but- this is not a clutch!! This damping was added in an attempt to
reduce the tiny residual motor speed anomalies.

peace,
pj

_____

From: CloneWheel@yahoogroups.com [mailto:CloneWheel@yahoogroups.com] On
Behalf Of Ted Thompson
Sent: Wednesday, August 16, 2006 9:11 AM
To: CloneWheel@yahoogroups.com
Subject: RE: [CWSG] Re: New clone ? (B-Free)

Not so. While it may appear so on the surface, each wheel has it's own
clutch and therefore can be in a random relationship to any other tone
wheel. The wheels are driven in pairs, but these are several octaves apart,
and each one is one clutch of it's own.

That being said, they don't randomly change their relationship during normal
operation. But they are in no way locked together, unlike the later solid
state models for example where electronic dividers were used to make all the
pitches.

The hunting that occurs after a brief power interruption is due to the slack
that exists in the driver train, which has several couplings in it, together
with the overall inertia of all that metal and the relative weakness of the
synchronis motor.

As a side note, that is somewhat related, one of the spinets (The T series?)
uses an electronic divider to make its 8' and 16' pitches. That divider is
fed by the pedal contact when it's depressed. As a result you can randomly
get pedal note in and out of phase with the true TWG note, which at times
can cause cancellations, making the pedal note sound funny.

Cheers!

Ted Thompson
General Manager - Speakeasy Vintage Music
____________________

Maryland Organ Service
- A Division of Speakeasy Vintage Music

http://www.speakeas yvintagemusic.com
http://www.mosweb. com
> -----Original Message-----
> From: CloneWheel@yahoogro ups.com
[mailto:CloneWheel@yahoogro ups.com]
On
> Behalf Of jblann1
> Sent: Tuesday, August 15, 2006 8:07 PM
> To: CloneWheel@yahoogro ups.com
> Subject: [CWSG] Re: New clone ? (B-Free)
>
> From what I understand in the TWG design, the tonewheels are lock-
> phased by octaves... What I mean is all C's are locked, all D's are
> locked etc... this is the only sure way to avoid phasing/chorusing
> type effects if 2 or more "c" harmonics go "out of tune".
> I did this on my B3 a couple of times-- turn off power just for a
> brief second holding down a chord, and sounds like 12 pitch-wheels got
> turned around, sending notes waving back and forth in different
> pitches until everything arrived back to normal. BUT each octave held
> its own, so all the C's waved at exactly the same direction, all the
> D's waved at exactly the same direction. Most clones don't always
> follow this rule, thus harmonic and phasing artifacts appear (mostly
> due to poorly looped, or very short-looped samples --VK7,8 B4,
> Electro) The only clones I really listened to that get it at least
> 99.99% right are H/S XK3,1 and Voce V5 series, Diversi organ.
> I think the "micro-wavers" exist due to so many variables, but also
> makes the original Hammond sound so hard to duplicate, because those
> slight "wavers" enrich the tone through the leslie and the room
> reflections around it, more than most clonewheels today.
> But that's my $.02
>
> >>.... ie that a defining characteristic
> > of the traditional TW generator is that the wheels runs in lock-step
> > phase. I am not so sure myself, but it is interesting the things we
> > argue to be elements of the 'true' sound, whatever that is. However,
> > I would be interested to learn more about those 'micro wavers in
> > pitch'. Are they a generic phenomenon or a symptom of something?
> >
> > -fk
> >
>
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