The Uni-Vibe, also marketed as the Jax Vibra-Chorus,Harry Shapiro, Michael Heatley, Roger Mayer
''Jimi Hendrix Gear'', page 120

Voyageur Press The Quarto Group is a global illustrated book publishing group founded in 1976. It is domiciled in the United States and listed on the London Stock Exchange. Quarto creates and sells illustrated books for adults and children, across 50 countri ...

is a footpedal-operated phaser or

phase shifter A phase shift module is a microwave network module which provides a controllable phase shift of the RF signal. Phase shifters are used in phased arrays. Classification Active versus passive Active phase shifters provide gain, while passive ...

for creating

chorus Chorus may refer to: Music * Chorus (song), the part of a song that is repeated several times, usually after each verse * Chorus effect, the perception of similar sounds from multiple sources as a single, richer sound * Chorus form, song in whic ...

and

vibrato Vibrato (Italian language, Italian, from past participle of "wikt:vibrare, vibrare", to vibrate) is a musical effect consisting of a regular, pulsating change of pitch (music), pitch. It is used to add expression to vocal and instrumental music. ...

simulations for

electric organ An electric organ, also known as electronic organ, is an electronic keyboard instrument which was derived from the harmonium, pipe organ and theatre organ. Originally designed to imitate their sound, or orchestral sounds, it has since develop ...

guitar The guitar is a stringed musical instrument that is usually fretted (with Fretless guitar, some exceptions) and typically has six or Twelve-string guitar, twelve strings. It is usually held flat against the player's body and played by strumming ...

. Designed by audio engineer Fumio Mieda, it was introduced in the 1960s by Japanese company Shin-ei (at the time Honey) originally branded as the Vibra-Chorus. The effect (now named Uni-Vibe) was modified to have easier access to its fuse, and a speed control foot pedal was added. It was later released in North America by Univox in 1968. It is commonly thought the Uni-Vibe is intended to emulate the "

Doppler The Doppler effect (also Doppler shift) is the change in the frequency of a wave in relation to an observer who is moving relative to the source of the wave. The ''Doppler effect'' is named after the physicist Christian Doppler, who described ...

sound" of a

Leslie speaker The Leslie speaker is a combined amplifier and loudspeaker that projects the signal from an electric or electronic instrument and modifies the sound by rotating a baffle chamber ("drum") in front of the loudspeakers. A similar effect is provided ...

. However Fumio Mieda revealed in an interview the effect was based on hearing radio signals (like Radio Moscow) undergoing “atmospheric modulation”. The effect has made its mark on tracks like

Robin Trower Robin Leonard Trower (born 9 March 1945) is an English rock guitarist who achieved success with Procol Harum throughout 1967–1971 and then again as the bandleader of his own power trio known as the Robin Trower Band. Biography Robin Trower ...

's "

Bridge of Sighs The Bridge of Sighs (Italian: ''Ponte dei Sospiri'', ) is a bridge in Venice, Italy. The enclosed bridge is made of white limestone, has windows with stone bars, passes over the Rio di Palazzo, and connects the New Prison (''Prigioni Nuove'') t ...

Jimi Hendrix James Marshall "Jimi" Hendrix (born Johnny Allen Hendrix; November 27, 1942September 18, 1970) was an American singer-songwriter and musician. He is widely regarded as one of the greatest and most influential guitarists of all time. Inducted ...

's " Machine Gun" and

Pink Floyd Pink Floyd are an English Rock music, rock band formed in London in 1965. Gaining an early following as one of the first British psychedelic music, psychedelic groups, they were distinguished by their extended compositions, sonic experiments ...

's " Breathe".

Overview

The effect, though often associated with chorus, is in fact created through a staggered series of phasing filters and an optical circuit utilizing LDRs (Light Dependent Resistor) and an incandescent bulb inside a light shield with a reflective interior, unlike the usually aligned filters of a normal phasing effect. Unlike most other phaser pedals, this is achieved without the use of op-amps. The Uni-Vibe phase shifter was known for its throbbing, hypnotic pulse and lo-fi sweep. These unique effects set it apart from other modulation-type effects at the time. The Shin-ei Uni-Vibe was also sold as a Univox product. , "Uni-Vibe" is a

registered trademark A trademark (also written trade mark or trade-mark) is a form of intellectual property that consists of a word, phrase, symbol, design, or a combination that identifies a product or service from a particular source and distinguishes it from ot ...

of Dunlop Manufacturing, Inc. Notable users of the Uni-Vibe have included

Trey Anastasio Ernest Joseph "Trey" Anastasio III (born September 30, 1964) is an American guitarist, composer, and singer-songwriter best known as the lead guitarist of the rock band Phish, which he co-founded in 1983. He is credited by name as composer of 152 ...

, and

David Gilmour David Jon Gilmour ( ; born 6 March 1946) is an English guitarist, singer and songwriter who is a member of the rock band Pink Floyd. He joined in 1967, shortly before the departure of the founder member Syd Barrett. By the early 1980s, Pink F ...

References

External links

* Effects units Dunlop Manufacturing {{guitar-stub