An example would be: EIAĦ06-4-21 would mean the 21st week of 1964. The last twoĭigits would refer to the week of the year i.e. If four digits are present, the first two digits Present, the first digit would refer to the year i.e. Numbers always begin with "606", and are followed by three orįour digits in various combinations. Transformers may help you to determine the date of production onĪmps that fall between the different dating schemes. These codes are for amps with the serial number beginning with a ![]() Therefore, if you have a push-pull pot, your amp is 1974 or newer.Īmps do not have a date code stamped on the tube location chart.
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