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Guitarists worldwide revere the legendary Fender Twin Reverb for its brilliant clean tones and luscious spring reverb.
Although Fender never kept serial number records of its amps, you can determine the approximate year your Twin Reverb was built by matching it against the cosmetic changes the amp has gone through.
A 1951 JAN B 1952 FEB C 1953 MAR D 1954 APR E 1955 MAY F 1956 JUN G 1957 JUL H 1958 AUG I 1959 SEP J 1960 OCT K 1961 NOV L 1962 DEC M 1963 N 1964 O 1965 P 1966 Q 1967 Mid ’70s – early ’80s – Amplifiers are dated much the same way as Fender guitars from the same era: B 5 digits 1975 – 1976 A6 5 digits 1976 A7 5 digits 1977 A8 5 digits 1978 A9 5 digits 1979 F0 5 digits 1980 F1 5 digits 1981 F2 5 digits 1982 – 1983 F3 5 digits 1983 – 1984 F4 5 digits 1984 – 1985 F9 5 digits 1979 – 1980 Dating Contemporary Fender Amplifiers All Fender amplifiers manufactured from 1990 – present include a date code printed on the quality assurance (QA) sticker on the back of the amp chassis, and are dated the by the first letter as the year and the second letter as the month.
Earlier models had black lines on the aluminum control plate. From 1977 to 1982, the Twin Reverb's power was increased to 135 watts.
Those manufactured in 1973 and later also featured a push-pull master volume knob.
A 1957 tweed Vibrolux was reported with a tube chart printed with circuit “5E3” (tweed Deluxe) instead of the correct 5F11 (see photo).
Clearly Fender wasn’t afraid to use incorrect parts when they were in a bind. The 5G12 Concert is the earliest version from very late 1959 and early 1960 so the existence of a tweed example, while extremely rare, is certainly plausible since Fender was making lots of tweed amps during the same time period.A 1990 JAN B 1991 FEB C 1992 MAR D 1993 APR E 1994 MAY F 1995 JUN G 1996 JUL H 1997 AUG I 1998 SEP J 1999 OCT K 2000 NOV L 2001 DEC M 2002 N 2003 O 2004 P 2005 ALL other Fender Amplifiers can be dated by the components inside: In almost every Fender amplifier there are several EIA (manufacturer) codes followed by a date code, typically found on the speaker(s), transformer(s), tubes, caps, and occasionally pots.