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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.
Unfortunately, the serial numbers are of little help for dating one of these pre-Ampeg models and EIA date codes on components were used sporadically during the early post WW-II years.
The only date codes that seems to be readily available is found on the speaker magnet located under the bell cover.
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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.
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Some common manufacturer codes for parts used in Ampegs include: The Michael-Hull amplifiers can be narrowed down to a date of manufacture between 19.