<P> The front panel also has a bright red pilot light lens (better known as "pilot lamp jewel" for its multiple triangular - shaped facets), covering the pilot light (made by the Chicago Miniature Lamp Co .). Other colour schemes (amber, white, green, purple and blue) are also available . Rear panel controls include a 2.5 - amp "slo - blo" fuse, an accessory AC outlet, an earth ground selection switch, on / off and standby switches . Additionally there are two speaker output jacks, and jacks for footswitches to activate / deactivate the reverb and vibrato effects . The black faceplates of the "blackface" era Twin Reverb will say either "Fender Electric Instruments" (FEI) or "Fender Musical Instruments", (FMI) depending on the date of manufacture . Units made before the takeover of Fender by CBS in 1965 will be marked Fender Electric Instruments, and be worth a bit more on the collectors market . </P> <P> The more common speakers found in Fender Twin Reverbs include Jensen C12Ns, Oxford 12T6s, JBL D - 120Fs (an upgrade at the factory), Altec Lansing 417 - 8Cs, Utahs and, in later years, CTS and Eminence models . Some Twins were fitted with EVM 12L variant speakers known as EVM 12Fs . Unlike most Electrovoice speakers, they were fitted with metal dustcovers like the JBL D - 120Fs . </P> <P> Twin Reverb amplifiers came standard with "tilt back legs" which allowed the amplifier to be tilted at an angle backwards, so the speakers faced at a more upward angle, promoting better distribution of their output to an audience when placed on a low stage . </P> <P> In 1968 the Fender amplifier line switched from the original black faceplate to a new brushed aluminum faceplate with light blue labels (except the Bronco, which has red) and changed the color of the grillcloth from silver grey to silver with sparkling blue threads embedded within it, ushering in the Silverface era . Other blackface cosmetic features were retained . The first silverface Twins used the blackface AB763 circuit until May 1968, when Fender switched to the AC568 . Since the tube complement was the same, Fender just used up their stock of printed tube charts saying AB763 until they ran out . </P>

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