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Vintage Fender Amps Year/Month Codes  
The following file will help you date your Vintage Fender Amp. On the inside wall of your amp cabinet, there may be a tube location sticker which shows the tube layout, model number, production location etc.. 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:

  • Fender Code Years

A 1951

B 1952

C 1953

D 1954

E 1955

F 1956

G 1957

H 1958

I 1959

J 1960

K 1961

L 1962

M 1963

N 1964

O 1965

P 1966

Q 1967

R 1968

S 1969

  • Fender Code Months

A January

B February

C March

D April

E May

F June

G July

H August

I September

J October

K November

L December 

 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. These numbers always begin with "606" , and are followed by three or four digits in various combinations. If three digits are present, the first digit would refer the units of the year i.e. ("7" would mean 1967). If four digits are present, the first two digits refer to the year i.e. ("66" would mean 1966). The last two digits would refer to the week of the year i.e. ("26" would mean the 26th week or approximately June). Here is an example: EIA 606-4-21 would mean the 21st week of 1964. It is also advisable to add about 6 months to the date to allow for time these parts may have spent in storage.

There are other methods used to date "Silverface" amps, you will need to get the date codes from your speaker frame, tube chart or pots.

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

220xxx = Jensen

465xxx = Oxford


The next number(s) is (are) the year. Initially this was a single digit, latter that was extended to two digits for clarity.

The last two digits are the week of the year. Note that if these digits are larger that 52, it probably is NOT a date code!

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.

Always remember that pots, speakers and transformers may have been changed!!

   


 
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