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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.
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.
One thing to remember in this chronological quest is these instruments were built to be played, not (in most cases) to become museum pieces.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.Some of the entries on the age list show actual known production dates and can be used as markers to guage the quality of other entries around them.