Dating vintage fender pots

So a pot stamped 1377833 is a CTS pot made in the 33rd week of 1978.

Note that this does not mean a Muff with a 1978 pot was actually made in 1978, it just means it was not made much earlier than 1978.

- All vintage USA Big Muffs have source-date codes stamped on the underside of the potentiometer cans, or “pots”.

The pots are what the knobs are mounted to, essentally manually adjustable resisitors that control the voltage across a circuit.

A 1990 JAN B 1991 FEB C 1992 MAR D 1993 APR E 1994 MAY F 1995 JUN G 1996 JUL H 1997 AUG I 1998 SEP J 1999 OCT K 2000 NOV L 2001 DEC M 2002 N 2003 O 2004 P 2005 ALL other Fender Amplifiers can be dated by the components inside: In almost every Fender amplifier there are several EIA (manufacturer) codes followed by a date code, typically found on the speaker(s), transformer(s), tubes, caps, and occasionally pots.

The EIA code will consist of 3 numbers followed by a date code of 3 or 4 numbers designating the year and the week.

Summary The AB763 Super Reverb is a very popular Fender amp due to the huge tone, robustness and the pure tone from the traditional blackface AB763 amp design.

There may also be some letter date codes rubber stamped on this sticker.It is less likely to be a 73 model than a 72 model and certainly not a 1971 model.It is most likely to be a late calendar year 72 or early calendar year 73 model.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 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.

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Here is an example: EIA 606-4-21 would mean the 21st week of 1964.

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