These numbers always begin with "606", and are followed by three or four digits in various combinations. These codes are for amps with the serial number beginning with a letter:ĮIA numbers taken from the transformers may help you to determine the date of production on amps that fall between the different dating schemes. Therefore, if you have a push-pull pot, your amp is 1974 or newer.ġ970-1989 - Most amps do not have a date code stamped on the tube location chart.
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