Dan abrams dating

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Tubes with "Hammond" silk screened on them typically have a code consisting of two pairs of numbers separated by a dash.

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The formula is XXX-YYWW, where XXX is the manufacturer EIA code (190 indicates General Instrument in the present example), YY is the last two digits of the year of manufacture, and WW is the week of manufacture.285642 would be a Rola speaker made in the 42 week of 19x6 (you have to figure out which decade using other information).For additional speaker manufacturer codes, see Ted Weber's listing at Weber Speakers.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.

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