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.
(see chart below) YY = is a one or two digit code indicating the year.
The next one or two numbers are the month where January is 1 and December is 12. Example: AB763 = second revision, July, 1963 AA1070 = First revision, October, 1970 Misc Dating Info: Silver face amps with the aluminum trimmed grilles are from 67 or 69.
The fist Master volume controls were first installed in 72.
There are several ways to determine when a Fender amp was produced.
First use the cosmetic features to get a range of possible years.
The raised “Fender” grille logo lost its tail around 76.