Dating of fender amplifiers
DATING CONTEMPORARY FENDER AMPLIFIERSAll Fender amplifiers manufactured from 1990 to the present include a date code, printed on the quality assurance (QA) sticker on the back of the amp chassis.This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing. Of the amplifiers labeled "Twin Reverb" (opposed to Super Twin Reverb or Twin Reverb II), there are two eras.Amps from the blackface era, which have a black faceplate, were manufactured from 1963 to 1967.The type of face, grille cloth, type and number of speakers, type and number of knobs, etc only come into play when you're trying to value the amplifier in the Blue Book for Guitar Amplifiers per the model description that is provided.They are not of a concern with dating as only the 2 letter date codes on whichever chart or sticker and the transformer number comes into play for that....Fender recommends dating unstamped amps by the EIA number on the transformers.The format is always EIA 606-Y-XX or 606-YY-XX where Y indicates the year (196Y/197Y or 19YY respectively) and XX the week. Dating by serial number, while less accurate, can be of some use.
In 1992, Fender began producing the '65 Reissue Twin Reverb. According to Fender, amplifiers produced through 1969 have a sticker near the tubes.The last two digits refer to the week of the year (i.e., a “26” would mean the 26th week or, roughly, June).For example, EIA 606-4-21 would denote the 21st week of 1964.These stamped letters may appear in various positions on the chart.In the table below, for example, a “JE” date code indicates a production date of May 1960.