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ORGAN Voice Section
- Original B-3 /C-3 Vibrato and Chorus Controls -
- SKX PRO Vibrato and Chorus
Controls -
u Vibrato & Chorus
The Hammond Vibrato & Chorus is a hallmark of the “Hammond Sound.”
“Vibrato” is created by a periodic raising and lowering of pitch, comparable to the effect produced when
a violinist moves his finger back and forth on a string while playing, varying the frequency while
maintaining constant volume.
On a tone-wheel Hammond Organ equipped with Vibrato & Chorus, the vibrato circuitry consists of a
series of plural coils or low-pass filter sections called a “delay line” or “line box” and a motor-driven
“scanner” which, as the name implies, scans the delay line and progressively retards the phase, creating
the Vibrato effect.
“Vibrato Chorus,” an effect similar to the effect of two or three slightly out-of-tune frequencies mixed
together, is obtained when the vibrato output signal is mixed with a portion of signal without vibrato.
The diagram below shows the vibrato equipment of a typical tone-wheel Hammond Organ such as a B-3.
t The Vibrato and Chorus Controls
The Vibrato and Chorus controls on vintage Hammond console organs with either a “2" or a “3" as part
of their model designation (B-2, B-3, etc.) consist of two tilt tablets and a six-position rotary knob to the
left of the Drawbars. The SKX PRO uses a similar arrangement, except that it uses buttons instead of tilting
tablets, and instead of a rotary knob there is a MODE button which accesses the same six degrees of
Vibrato and Chorus.
HA<O> SKX PRO Reference Guide
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