====== After the Bigsby, the next major development was
Leo Fender's
synchronized tremolo, the device that introduced the term
tremolo arm ( filed in 1954, issued in 1956). First released in 1954 on
Fender's
Stratocaster, the simple but effective design offers a greater range of pitch change than the Bigsby, and a better capability for up-bends. Fender incorrectly labeled the arm as a "tremolo arm" rather than a "vibrato arm", conversely referring to the
tremolo circuit on his amplifiers as "vibrato". Vibrato systems send a guitar out of tune when friction inhibits the vibrating length of string from returning to its original tension after a pitch bend. Fender's design is 'synchronized' in the way that the bridge saddles and string ends move together as one rigid unit, mostly eliminating sliding between string and saddle. The unit attaches to the guitar's body with six steel wood screws. So the bridge can pivot smoothly about the screws, the upper portion of each one is unthreaded, they are not tightened all the way, and they pass through slightly oversized holes in the plate at the center of the design. {{multiple image |align=right |direction=horizontal |width=200 Six bridge saddles are held against this plate by string tension, individually adjustable both for height and intonation. Another of the components which make up the tailpiece consists of a solid block of metal, commonly made of zinc, but aftermarket products can be made out of materials such as titanium or brass (often like the saddles). The different compositions, as well as its mass, helps to determine the quality of the sound of the guitar. The block is secured to the base plate by three machine screws and resides in a cavity routed all the way through the guitar's body. In this cavity, up to five
coil springs tether the end of the bridge block to the body, counteracting the pull of the strings, should this be the setup choice for the guitarist. There can even be differing sizes of tremolo arms in thickness depending on the date and country of manufacture. The number and length of springs may be adjusted to set the neutral position of the bridge, determining the range of upward and downward pitch bending available. A bridge set to 'float' off the guitar lets the guitarist raise the pitch until the bridge presses against the body. Pitch bends are accomplished by pulling up or down on an arm screwed into the tailpiece block, usually free to swing. The Fender
synchronized tremolo is the most widely copied vibrato system. The original design is still in production virtually unchanged today. The
synchronized tremolo may have been the reason for the popularity of the Stratocaster among rock musicians in the late '60s and '70s. Owing to its superiority in aggressive use, all Fender guitars using any other vibrato system other than the
synchronized tremolo were for a time withdrawn, to return to the catalog as classic or retro models in the '90s. ======== Later models are pivoted about two specially shaped studs rather than a row of six screws. This development sacrifices economical manufacture for decreased friction at the pivot point. Currently, the Fender
two-point system is their standard and most popular design. Featuring stainless steel block saddles since its introduction in 1986, the Fender two-point system has been redesigned with new vintage-style bent sheet steel saddles as of 2008. The Fender two-point system is available with two types of "tremolo bars": traditional "screw-in" type with a plastic tip at the end and deluxe "pop-in" type without the plastic tip. Not to be confused with the similarly named
Floyd Rose two-point locking tremolo, the two systems use the words
two-point to describe entirely different concepts.
Fender floating bridge The
floating bridge featured on two Fender "tremolo arm" designs, both developed by Leo Fender subsequently to the original synchronized tremolo but overshadowed by it. Despite its not being the most popular bridge, there are benefits unique to guitars with this type of bridge (See
3rd bridge guitars).
Floating tremolo The
floating tremolo was designed by Fender for the Fender
Jazzmaster, and first appeared with the release of the Jazzmaster in 1958. A larger, heavier and more complex vibrato mechanism than the synchronized tremolo and promoted over it by Fender as their premium "tremolo arm" mechanism, it never achieved the same popularity, though if properly set up according to Fender's recommendations, it held tune as well as or better than the synchronized tremolo unit. A major cause of the floating tremolo's increasingly poor reputation since its introduction is the far-increased availability and popularity of
lighter guitar strings, which do not produce enough tension in standard tuning to compensate for the low break-angle over the bridge and, in the
Jaguar's case, the exceptionally short scale length of 24 inches. This places relatively little downwards force on the bridge, making it unreliable in returning to the correct position after tremolo operation. The main difference is that, while much of the mechanism of the synchronized tremolo including the springs is accessed by removing a rectangular plate in the back of the guitar body, and is mounted on the guitar body in a routed bay extending behind the pickups, the entire mechanism of the floating tremolo is mounted on a roughly triangular chromed plate in the front of the guitar body, on the opposite side of the bridge to the pickups. The string tension is balanced against a single short helical spring, in
compression rather than
tension, mounted on the back of the "tremolo mounting plate". The spring is adjustable by turning a screw located towards the center of this plate. The ferrule ends of the strings are held on the top of the guitar in a tailpiece plate called the
knife plate, which emerges from the mechanism, rather than the strings vanishing into the mechanism as with the synchronized tremolo. It is the knife plate that is moved when the tremolo arm is operated. Unlike the synchronized tremolo, the bridge is not moved directly by the mechanism, but only by the movement of the strings, and is allowed to tilt to accommodate this movement. This is called a
floating bridge. The Fender floating tremolo also features a knob that enables the player to lock, and thus disable, the tremolo mechanism. This facilitates quick retuning in the event of a string breaking and strives to provide tuning stability similar to a fixed bridge guitar. In practice, the lock doesn't generally achieve as much stability as a fixed bridge, leading some players to replace the mechanism with a fixed bridge and tailpiece. The "floating tremolo" was greatly favored by some
surf music bands, particularly for its ability to produce a pronounced and distinctive vibrato on a sustained chord without disturbing the tuning of the guitar. To fully achieve this benefit however, correct setup, as per Fender's recommendations, was essential. In addition to the Jazzmaster, Fender used the floating tremolo on the then top-of-the-line
Fender Jaguars, released in 1962, and also on the
Fender Bass VI, released in 1961. Jaguar and Jazzmasters share the same bridge plate and string saddles, though Jaguar bridges (and the earliest Jazzmaster bridges) have taller
legs. The two are functionally interchangeable and replacement parts for each are identical. The Bass VI bridge has a wider plate and longer intonation screws to accommodate bass string intonation, and the saddles have threads cut for larger diameter strings. There have also been a small number of not very notable imitations by other makers, generally without the locking knob. Fender discontinued all floating tremolo models by 1980, but reintroduced both the Jazzmaster and Jaguar first as Japanese models in the mid 1980s, then as American-made reissues in the 1990s. The tremolo-equipped Bass VI was reintroduced as a US Custom Shop model in 2006. An advantage or disadvantage, depending on taste, is
string resonance audible at several fret positions where a simple relation exists between the length to the fret and the string length behind the bridge (for instance 48:12 = 4:1). At those positions, a high overtone rises in volume. This becomes clearer with an over-driven guitar sound. The overtone might sound odd, but it still has a harmonic relation to the note, so is not out of tune related to the open string. For staccato playing, it can be annoying. Muting the strings behind the bridge with felt or other material solves the issue.
Dynamic Vibrato The
Fender Dynamic Vibrato (also colloquially referred to as the
Mustang tremolo or
Stang trem) was introduced in 1964 on the
Fender Mustang, intended as a student model. It was also notably used on the
Jag-Stang, a custom design by
Nirvana frontman
Kurt Cobain combining features of the
Jaguar and the Mustang. Some late 1960s Mustangs were fitted instead with the
floating tremolo, which was promoted by Fender as their premium unit, but later Mustangs returned to the Dynamic Vibrato. The Dynamic Vibrato is still preferred by some
lead guitarists above all other designs. It features a floating bridge similar to that of the floating tremolo, but the bridge is integral with the vibrato unit, unlike that of the floating tremolo, which is mounted separately. The strings are controlled by a tailpiece bar to which the vibrato arm is visibly connected, similar to the Bigsby, and the mechanism is installed from the top of the instrument, similar to the floating tremolo. It combines some features of all three basic designs. The Dynamic Vibrato is often confused with the Fender floating tremolo, which it resembles. The original production runs of the two overlap by more than a decade, but the mechanisms are quite different. The existence of a few 1960s Mustangs factory fitted with the floating tremolo has probably added to the confusion. The concealed mechanism is in a chamber of a completely different shape and position, requiring an impractical amount of woodwork to convert from one to the other, and the mounting plate is of a different shape with different mounting holes. The string tension is balanced against two medium length helical springs under tension, mounted on the underside of the tremolo mounting plate, one attached to each of the two feet of the tailpiece bar. Dynamic Vibrato units may be recognized by the integrated floating bridge and the stamps "Fender" and "DYNAMIC VIBRATO". Many but not all units also have the words "PAT PEND" or "PAT. NO. 3,241,418" stamped under the word "Fender". The Dynamic Vibrato was the last of the floating bridge designs Fender discontinued, with the Mustang in 1982—and the first they reintroduced, again with the Mustang, in 1990.
Other Fender designs Still another design appeared on the student model
Fender Bronco, released mid-1967. This was simply known as the
Fender vibrato tailpiece, or sometimes the
Fender steel vibrato. It was again designed by Leo Fender although he had sold the company by the time it appeared. Basically, a synchronized tremolo simplified to reduce cost, it had little popularity, and was the only Leo Fender vibrato arm design not available on any current Fender model. In 1981
G&L released the F-100 guitar with a
dual-fulcrum vibrato designed by Leo Fender, one of G&L's owners. ==Gibson Vibrola==