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I pulled this information from Google's cache of the site. If anyone feels this should be taken down, please feel free to contact me. Ampegs can be divided into six distinct groups for dating purposes: pre, to mid, early tototoand post 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. These codes can be found on speakers, transformers, pots, capacitors, and multi-section electrolytic "can" caps. Of course, these codes are only applicable to original components, not replacement parts.
Shortly after World War II, American electronic component manufacturers began to stamp a semi-standardized code into the parts they produced. The code contained information regarding the manufacture and date of production. These codes have been used on components including potentiometers potstransformers, capacitors, tubes, and speakers.
The code usually consists of 6 or 7 digits such as where the first two or three digits is the EIA code for the manufacturer denotes CTSthe fourth digit and sometimes fifth digit denotes the year in this case it could be66, or Ampeg cabinet datingand the last two digits denote the week of the year. It is important to note that parts do not always contain EIA codes, especially those parts from the late s and early s. The Ampegs made between and did not have serial s and must be dated in the same way as the Michael-Hull models, specifically, by finding the EIA date codes on pots, transformers, multi-section "can" capacitors, and speakers.
For example, a Duette with serial was made in 7during October 10and was possibly the st amp made that month. A Super Echo Twin with serial was made in 4during April 04 and may have been the th amp made that month Caution is needed for dating amps from,and The serial s from these years were duplicated in,andrespectively.
Taking the example Super Echo Twin above, its serial alone could denote April or April A Mercury with serial could be from September or it could be from the second serial system implemented in Luckily, it is very easy to determine which year the first digit denotes. The key is the model and the cosmetics. For instance, the Super Ampeg cabinet dating Twin was made inbut not in Likewise, an Ampeg from would not be covered in blue check vinyl whereas an amp from would have this covering.
An Ampeg from would be covered in navy random flair vinyl whereas an amp from would be covered in blue check vinyl. Another check for a versus a or later serial i. Therefore, a serial where these two digits are greater than 12 must be from the second serial system - A final cross check with EIA dated components should remove any doubt about an made during the - 65 period. The second serial system was implemented in January and used until the end of This system overlapped with the serialization scheme for a period of about 6 months. These are also Ampeg cabinet dating s, which appear to have been applied sequentially, but they are not date encoded.
Enough information serial s, model, date codes has been gathered to prepare the following guide for dating by serial. Note that the year associated with a range of serial s is very rough and will likely change as more information is gathered for refining the estimates. The EIA date codes of original components should be used to confirm an approximate date of manufacture.
The third serial system was implemented in Not enough information was available to the authors to determine year of manufacture by serial. An added variable is that during the Magnavox years, Ampeg may have used separate serial systems for each model or for models that shared the same chassis like the VT and V Until such time that enough information is available to date s Ampegs by serialthe features of the amps from this period can be used and compared to the following table.
Ampeg V4. Therefore, do not poke around in your old Ampeg if you are unfamiliar with amplifier electronics or their operation.Ampeg cabinet dating
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Dating a Ampeg Classic cab