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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.

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Inside each Leslie produced after 1956, on the lower baffle, is a date code (sometimes hidden by the bass speaker).

Here's how it works: You have to be able to date the Leslie within 10 years, which should be fairly easy.

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.

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.

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.

In the example shown, 190-7215 was made in the 15th week of 1972.

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