Dating jbl speakers
The fist Master volume controls were first installed in 72.
The raised “Fender” grille logo lost its tail around 76.
Nearly the entire body is covered in a mesh fabric except for the edges and a silicone strip that runs across the length of the speaker.
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If possible, open up the chassis and check a few of the pots’ and capacitors’ manufacturer codes.
Remember, many components could have been changed over the years, speakers blow, caps dry out, transformers melt down, and pots wear out.
So if you find pots from late 68 and transformers from early 69 you can be pretty sure your amp is a 1969.
For example, if you find pots from late ‘64 and transformers from early ’65, you can be pretty sure your amp is a 1965.Here is a cool link to a Vintage Fender Amp price history chart that tracks sales data for specific amp models by the month.Date Code: Wide panel, narrow panel, brown, blonde, and black face amps have a date code hand-stamped on the tube chart. The first letter translates to the year and the second to the month. Example: FG=July 1956, QA=January 1967, and a reissue CG=July 1992 EIA Source-Date Codes: Electronic components such as transformers, potentiometers, speakers, and some capacitors are often stampted with a date code indicating who manufactured them and when.The code is simple, the first two letters are the revision, where AA is the first revision, AB is the second, etc.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.