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Thus a pot with the code of 137634 would be a pot made by CTS in 34th week of 1966.Note that speakers also use the same type of date code.("26" would mean the 26th week or approximately June).Here is an example: EIA 606-4-21 would mean the 21st week of 1964.The format may look like this: 220 637 Here the number 220 designates the speaker as a Jensen, and 637 indicates a production date of the 37th week of 1956 or 1966.Fender has used only a handful of different speaker types over the years.There may also be some letter date codes rubber stamped on this sticker.These date codes will contain two letters of the alphabet which refer to the year and month of production, and may be interpreted as follows: In the absence of the rubber-stamped date codes, EIA numbers taken from the transformers may allow you to determine the date of production of your amp.
Dating Fender Amps 1951-1967 – Tube chart on the inside of the amp is stamped with two letters (A – Q): The first letter designates the year and the second letter designates the month.
The EIA code will consist of 3 numbers followed by a date code of 3 or 4 numbers designating the year and the week.
To give an example, a typical Oxford speaker from the ’60s will look something like: 465-217.
Pots and speakers are usually stamped with a 6 or 7 digit code that can be dated as follows: The first 3 are the manufacturers code 137xxx = CTS 304xxx = Stackpole 140xxx = Clarostat 134xxx = Centralab 381xxx = Bourns 106xxx = Allen-Bradley Speaker Manufacturers codes 67xxx = Eminence 117xxx = Credence 137xxx = CTS 220xxx = Jensen 270xxx = Quam 285xxx = Rola 328xxx = Utah 391xxx = Altec/Lansing 433xxx = Cleveland 465xxx = Oxford 649xxx = EV 1098xxx = Pyle The next number(s) is (are) the year.
Initially this was a single digit, latter that was extended to two digits for clarity. Note that if these digits are larger that 52, it probably is NOT a date code!