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Gibson bar bridge - first version. Part number BR-655N. Nickel. Notice the straight, thin mounting arms. Although the strings can not be intonated individually, the whole bridge could be moved slightly, with adjustment of either of the hex-screws perpendicular to the bridge posts. As used on the EB bass, EB0, EB2 and EB3. Phased out in 1965, in favour of the chromed version, below.
Gibson six string bass bar bridge. Part number BR-650N. Nickel. This bridge is the basically same as part number BR-655N above, except that it is made for Gibson's six-string bass, the EB6.
Gibson bar bridge - early version. Part number BR-655CH. Chrome. Notice the rounded, wider mounting arms. Like the previous version, an approximation of intonation could be acheived by adjusting the hex screws. This bridge appeared on the EB3 in 1965, perhaps earlier, whilst the EB0 continued to use the nickel version (part BR-655N, above) until stocks were used. When the intonatable bridge came in in 1967, last stocks of this bridge were used on Gibsons budget brand bass; the Kalamazoo KB bass
Gibson Thunderbird bridge (1960s). Part number BR-750N. This was Gibsons first bass bridge to allow seperate intonation of each string, and was used on the reverse and non-reveerse body Thunderbirds from 1963-69. Unlike all other Gibson bass bridges, it required a seperate tailpiece, and was fitted with a damper spring, which acted as a mute by pushing felt blocks (not pictured) against the strings. The bridge posts were short-bushing type, nickel (early) or chrome (later) plated
Even though this bridge was designed to be intonatable, in practise this was not always possible, leading people to reposition the bridge slightly. A replacement bridge by Scott Dasson (Dasson or Badbird bridge is currently available that resolves this issue, with no modifications necessary to the instrument itself.
Gibson two-point bridge. Introduced in around 1967, the two point bridge was Gibsons first attempt at a bass bridge that allowed separate intonation of each string. The bridge attches to its posts by means of two hex screws. When posts or hex screws are worn, the bridge can tip forward to some extent, which can cause problems with action, and intonation. This is common in basses with no under-bridge mute. Notice also that the silk wraps at the ball end of the string don't always stop before the bridge saddle, avoided, by removing some of the wraps with a razor blade. Most versions had the nylon saddles pictured here, though around late 71, early 72 some of these bridges were equipped with chrome plated metal saddles.
Gibson three-point bridge. Introduced in mid 1973, and still in use today. This bridge is a sturdy, heavy-duty bridge which overcomes the tendancy of its predecessor to tip forward, by having an extra post at the front. The bridge pictured has black plastic surrounding each post hole - though this is the exception rather than the rule.
Gibson TRI-4 wedge bridge. As used on the Gibson Victory and Explorer basses
Chrome bridge cover Introduced in 1963 - the earliest (nickel plated) covers were only used on the Thunderbird. From around 1967-80 these covers (now chrome) were fitted to all EB, Thunderbird, Ripper and Les Paul basses. When under-bridge mutes were phased out in the early seventies, many of these covers had a strip of foam glued to the underside, which acted as a mute. To 'unmute' the cover would be removed
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