Some specific examples are cited that can be used to provide assistance in identifying the production date of similar components. Tung-Sol 6550 tubes have the following format: XXXYYWW, where XXX is the EIA manufacturer code, YY is the last two digits of the year and WW is the number of the week in that year.
3227204 is a Tung-Sol tube manufactured during the fourth week of 1972.
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One thing to remember in this chronological quest is these instruments were built to be played, not (in most cases) to become museum pieces.
Don't get too hung up on searching for temporal coordinates to the exclusion of the unit's real purpose as a musical instrument.
Even the above is fraught with some risk, as replacement parts used for repair or modification will occasionally skew the overall picture.
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Until this work is published, the Age List will continue to function more or less as it has; a quasi-definitive source of this information and a registry of Hammond and Leslie product owners.
Thanks to the Electronics Industry Association (EIA) code conveniently placed on them by the manufacturer, many individual components can be dated to the year and week of production.