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These codes have been used on components including potentiometers (pots), transformers, capacitors, tubes, and speakers.

The code usually consists of 6 or 7 digits such as 137634 where the first two or three digits is the EIA code for the manufacturer (137 denotes CTS), the fourth digit and sometimes fifth digit denotes the year (in this case it could be 1956, 66, or 76), and the last two digits denote the week of the year.

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A Mercury with serial number 009054 could be from September 1960 or it could be from the second serial number system implemented in 1965.

Luckily, it is very easy to determine which year the first digit denotes. For instance, the Super Echo Twin was made in 1964, but not in 1954.

Nevertheless, for dating purposes, the serial number provides adequate information during this period.

For example, a Duette with serial number 710201 was made in 1957 (7), during October (10), and was possibly the 201st amp made that month.

Ampegs can be divided into six distinct groups for dating purposes: pre-1953, 1953 to mid-1965, early 1965 to 1969, 1969 to 1979, 1981 to 1984, and post-1984.

Each group uses a unique serialization scheme that can be used to assist in dating the amps, but in many cases, it is the features and characteristics of the amps that determine the year of manufacture.

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The M-12 Mercury circuit of 1960 used 6V6 power tubes, but the Mercury circuit of 1965 used 7591As.

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