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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.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.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.Until this work is published, the Age List will continue to function more or less as it has; a quasi-definitive source of this information and a registry of Hammond and Leslie product owners.When you hit the "Submit" button you will see a message advising "Update Successful".Your information will be placed in a holding area for review and added to the age list after acceptance.
Tung-Sol 6550 tubes made for other companies (like RCA) have a four-digit date code only.
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.