Hammond organ serial number dating

3227204 is a Tung-Sol tube manufactured during the fourth week of 1972.

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.

Note: Organs produced after 1968 had a letter prefix code in the serial number: A=1969, B=1970, C=1971, D=1972, E=1973.

Sometime in mid-1973, in the mid-200000's, Hammond dropped the prefix letter.

Even the above is fraught with some risk, as replacement parts used for repair or modification will occasionally skew the overall picture.

Additionally, some organs have been pieced together in order to get one working unit out of many; this will produce inconsistent and unlikely date code ranges.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.Any other single speed model (45/47/51) is prior to late 1963.The format is YY-WW, where YY is the last two digits of the year and WW is the number of the week in that year.In the example, 73-48 is the 48th week of 1973Hammond 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.The new style Leslie logo appeared in 1970, and cabinets made after then have particle board baffles rather than all hardwood construction and are missing the instruction sheet formerly pasted to the back.

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