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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.
Most of the tone generator wax and Mylar capacitors do, as well as pre- and power amplifier multi-section can electrolytic capacitors.
The code typically takes the form of YYWW, where YY is the last two digits of the production year and WW is the production week. All of the speakers in Hammond organs, Hammond Tone Cabinets and Leslie cabinets dating from 1946 forward that I have seen have production date codes stamped on them. The coding scheme is XXXYWW where XXX is the company EIA code (Jensen = 220, Rola = 285, Heppner = 575), Y is the last digit of the production year, and WW is the production week.
Just to get started, 21H's are 1951 to 1958, 22H's are 1958 to 1963, 122/142/147/145's are late 1963 and later.
For additional speaker manufacturer codes, see Ted Weber's listing at Weber Speakers.To include a Leslie speaker or Hammond Tone Cabinet see the bottom of this page. Beginning in late 1935 and continuing to mid-1975, the archetypal instrument we think of when hearing the word "organ" was produced by the thousands.Please include an email address so I can contact you if I have a question. With a production history covering more than forty years, determining the exact manufacturing date of tonewheel Hammonds used to be difficult; new models were not introduced every year and production changes that were made were often subtle.In the example shown, 190-7215 was made in the 15th week of 1972.Earlier Leslie motors have a stamped four digit code.
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3227204 is a Tung-Sol tube manufactured during the fourth week of 1972.