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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Ampeg may very well have used 100 or 101 as the starting point during slow production periods.

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

WARNING: Ampeg amplifiers, especially the high-powered amps such as the SVT and V-series, contain lethal voltages even when unplugged and turned off.

Therefore, do not poke around in your old Ampeg if you are unfamiliar with amplifier electronics or their operation. Shortly after World War II, American electronic component manufacturers began to stamp a semi-standardized code into the parts they produced.

Caution is needed for dating amps from 1953, 1954, 1955, and 1960.

The serial numbers from these years were duplicated in 1963, 1964, 1965, and 1965, respectively.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.Electronic Industries Association (EIA) codes can also be very useful for giving clues as to an amp's age.I pulled this information from Google's cache of the site.It has a note at the top of the page that they were reprinting with permission from the authors of Ampeg: The Story Behind the Sound, ©1999, published by Hal Leonard.Another check for a 1960 versus a 1965 or later serial number (i.e.