From breynold@usc.edu Sat Jan 08 11:28:50 2005
Subject:Re: Motion Sound: matching upper/lower rotor speed


Athough the motors were the same on the 122 and 147 series Leslies, the 122 AMP itself is said to cause a slower speed change, not sure if it is acerllation or decelleration or both. In fact, Bob Schleicher advertises that his solid state relay replacement causes a 122 Leslie to have speed changes more like a 147.

And, I believe that the "Decorator Furniture Versions," namely the 222, may have had the lower motor reversed so that the upper and lower rotors moved in the same direction, which many people then want to modify!

----- Original Message -----
From: jacobsenrichard
> To chop the upper ramp speed
> > immediately loses a fine effect - but some that don't know, or
> for
> > whatever reason (maybe 1st experience?) simply prefer it, want
> > instant slow. In any case: Instant ramp-down of the upper rotor
> is
> > NOt a "standard" factory default for all Leslies. I don't
> remember
> > specifically which - most likely some new or just-reconditioned
> > 122's - but a few Leslies ramped down instantly, others took a
> bit
> of
> > time, depending on model, pulley selection, age and wear, etc.
>
> The motors in the 147, 145, 122 and 142 were all the same! Only
> the
> amps are different in them. The 122/142 tremolo switching is
> controlled with a DC voltage superimposed over the audio channel
> Pins 1 and 6, a 147/145 tremolo is switched with AC. This is why
> there is more of a problem with "click" or "crack" when switching
> speeds on 145/147 Leslies.
>
> There are two motors for each rotor, slow and fast. The fast motor
> is the larger one, which has the smaller slow motor mounted
> underneath it(backwards on the bottom rotor because the motors are
> upside down). When you switch to slow speed on the upper rotor,
> the
> smaller slow motor is engaged and rides along side a wheel that
> has
> a rubber belt attached to the fast motor. When switched to fast,
> the
> slow motor disengages and the fast motor goes to fast speed. The
> fast speed reaches full RPM almost instantly when switched, the
> slow speed slows imediately. The small motor is mounted
> differently
> on the top rotor as opposed to the bottom rotor. The bottom rotor
> has the definite ramp up and ramp down time.
>
> > but some that don't know, or for
> whatever reason (maybe 1st experience?) simply prefer it, want
> instant slow. In any case: Instant ramp-down of the upper rotor is
> NOt a "standard" factory default for all Leslies.
>
> It is for top rotor on the above models and all the Pro Series
> Leslies I've ever used or seen. The new Leslie 2101 has the
> capalility of changing the ramp speeds though. I do know because
> I've played Hammond organs with Lelies for over 40 years and every
> Leslie I've ever owned or used works this way!
>
> I don't think you should make assumptions of peoples experience or
> ridicule them unless you know more about them. I'm not disputing
> peoples taste of how they want a Leslie to sound, I was merely
> telling Karl how the stock Leslies work! You have accused me of
> not
> knowing what I'm talking about before. This time I'm telling you I
> find it patronizing offensive.
> Rick
>
> ------------------------ Yahoo! Groups Sponsor --------------------
> ~-->
> Has someone you know been affected by illness or disease?
> Network for Good is THE place to support health awareness efforts!
> http://us.click.yahoo.com/pKxVKC/UOnJAA/n1hLAA/XkLolB/TM
> -------------------------------------------------------------------
> -~->
>
> To unsubscribe, send email to: CloneWheel-
> unsubscribe@yahoogroups.com
> Yahoo! Groups Links
>