Your information will be placed in a holding area for review and added to the age list after acceptance.
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.
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.
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.
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.
Even the above is fraught with some risk, as replacement parts used for repair or modification will occasionally skew the overall picture.
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.
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.
Due to Hammond and Leslie purchasing components in large quantities, using these codes as definitive signposts will not produce an accurate "born on" date.