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ProCo Rat Potentiometer Date Codes

Most Rats up until mid 2000's used CTS pots. To determine the date of your Rat find the 7 digit number on the back of the pots.
The 1st three digits are the manufacturers code.137 = CTS (Chicago Telephone Supply). The 4th and 5th numbers are the year made (example: 1378509)

rat pot 2 1985 would be the date for this pot.
rat pot 1 This is a pot from a very early "Fringe logo" Big BoxRat. Date code is 1979

 

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