Design
The Bigsby vibrato unit is installed on the top of the guitar and works in conjunction with a rocker bridge. The arm of the Bigsby is spring-loaded and attached to a pivoting metal bar, around which the strings of the guitar are installed. In the neutral or unused position, the pressure of the spring counterbalances the pull of the strings, resulting in constant pitch when the strings are played. When the arm of the Bigsby is pushed down towards the top of the guitar, the bridge rocks forward causing the strings to loosen, lowering their pitch. When the arm is released, the strings return to normal pitch.
The arm may also be lifted slightly to raise the pitch of the strings. The Bigsby is highly controllable within its range of motion and usually requires little force to operate. Lifting the arm too much, however, will result in the spring falling out of the unit making the Bigsby more suitable for downbends, rather than upbends. It is ideally suited to musicians who use slow, subtle, or extended bends. It has limited range compared to tremolo units using longer springs contained internally. Competing units, like the Floyd Rose and the Fender synchronized tremolo (or strat-style) are therefore preferred by some players.
Bigsby vibratos are still factory installed on a variety of electric guitars, including certain instruments branded as PRS (Starla), Epiphone, Fender, Gibson, Gretsch, Guild, Hamer, Ibanez, Schecter Guitar Research as well as luthiers companies such as Motor Ave. Many electric guitars can also be retrofitted with a Bigsby, which requires no additional routing, but may require additional holes to be drilled. Adapters, such as the models sold by Vibramate, can be used to install a Bigsby Vibrato on a guitar without drilling any holes. Variations in guitars, such as between flat top and arch top, require different models of Bigsby. Bigsby units ship with their own rocker bridges, though these are often discarded in favor of more adjustable alternatives such as the Tune-o-matic style bridge or Jazzmaster style bridge. The rocker bridges that come with the Bigsby do not offer individual string intonation adjustment, and have relative string length preset for string sets with a wound G string, rather than for the plain G string preferred by many electric guitarists today.
Read more about this topic: Bigsby Vibrato Tailpiece
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