The code follows the format: = a number from 1 - 52 indicating the week of manufacture.
Remember, your amp is newer than the newest component.
Several different types, in vertical and diagonal weaves, were used.
Please note that it’s quite difficult to precisely determine the production date of early Fender amps.
This black-and-silver sticker contains several lines for “sign-offs” on completion of sound and electrical testing.
The final line contains a date code of two printed or handwritten letters denoting the amplifier’s production date by year (the first letter) and month (the second letter).
I promise the tables will still be there after you finish reading.
Okay, I know you’re all just dying to skip ahead to the serial number tables but try to contain your excitement and read through the article first.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.and these changes are often disclosed and of a non-malicious nature.Other things to look for include chasses placed in cabinets from a different year, “doctored” tube charts, non-original control plates (usually reproductions) on silverface amps, original transformer bell ends (they have correct date codes, of course) on non-original transformers, and non-original knobs (either repro or silverface knobs on blackface amps).unusual things can be found such as the empty “Pulse Adjust” hole on the rear of early ’60 brown amps, the “middle” volume control, use of tweed style grill cloth, strange non-documented transitional circuits, and changes in tolex color including the super-rare cream colored “brown” tolex that is found on some late ’60 amps. Given that people may refer to this information seeking specific production quantities of amps they are curious about, it should be pointed out that the serial numbers apply to chassis types, and not specifically to amplifier models.First, it will be useful to you to understand the following five terms in order to choose the correct chart for dating your amp: refers to the two-tone woven fabric that covered many early amplifiers.