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3227204 is a Tung-Sol tube manufactured during the fourth week of 1972.

Tung-Sol 6550 tubes made for other companies (like RCA) have a four-digit date code only.

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.

Due to Hammond and Leslie purchasing components in large quantities, using these codes as definitive signposts will not produce an accurate "born on" date.

To help determine the manufacturing date of Hammond organs and Leslie speakers.

Use this form if you would like to submit your Hammond Organ for inclusion in these tables.

Recently, the production data was found and there is no longer any need for guessing.

This information is being compiled, organized and edited into a soon to be released book that details all sorts of production and manufacturing information, including tables showing serial numbers and their date of production.

Your information will be placed in a holding area for review and added to the age list after acceptance.What follows is a breakdown of the more common parts and a description of their codes.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.However, by examining those components as a group one can determine that the instrument was produced no earlier than the latest date indicated by its component parts.In general, tubes appear to have had the shortest stock life and speakers the longest.

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