Dating fender amps chassis
Blues Junior history can be divided into two major categories: the early amps with green circuit boards and the later ones with cream-colored boards.
The cream-colored board is laid out entirely differently (and better) than the green board. But the old ones sound darker, while the new ones are brighter, with more emphasis on treble tones.
The C12N doesn’t sound much like vintage Jensens, and it can be shrill-sounding. Some people prefer the Special Design and don’t consider it an improvement.
The Texas Red model uses the Celestion Vintage 30 speaker.
Next, (if applicable) look for the date code on the tube chart.
If your amp dosen’t have a date code, flip the amp upside-down and check the transformers, and speakers for their manufacturer codes.
The raised “Fender” grille logo lost its tail around 76.
The chassis can also be found in the weird, plastic-cased Deco-Tone and in some Custom Shop amps with exotic wood cases such as bubinga.
Serial Number: There is no information readily available for dating Fender amps by serial number but there are people working on it. Circuit Code: In 1963 Fender stoped using model numbers to identify schematics and began using the model name and an assigned circuit number.
These circuit numbers which are located on the tube chart can be usefull for getting a rough date on an amp.
The code follows the format: XXXYY ZZ where: XXX = a two or three (possibly four on newer amps) digit number indicating the manufacturer.
(see chart below) YY = is a one or two digit code indicating the year.