Dating fender pots
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).
The raised “Fender” grille logo lost its tail around 76.
There are exceptions to this rule like the the Bronco.
Remember, many components could have been changed over the years, speakers blow, caps dry out, transformers melt down, and pots wear out.
Non-Schumacher transformers – It’s been universally accepted that Fender only used Schumacher transformers on amps made in the 1960s and 1970s.
These are marked with EIA code “606” which is the company number for Schumacher.
Remember, your amp is newer than the newest component.
So if you find pots from late 68 and transformers from early 69 you can be pretty sure your amp is a 1969.
The code follows the format: XXXYY ZZ where: XXX = a two or three (possibly four on newer amps) digit number indicating the manufacturer.