Age of vintage Unidyne 55 series microphones

FAQ #150 Updated January 04, 2016

Question:

IS THE ANY WAY TO DATE THE 55 SERIES? THERE WERE SEVERAL I'VE SEEN FOR SALE WITH SERIAL NUMBERS AND I WAS WONDERING IF THE DATE CAN BE FIGURED BY A CHART? I.E. S/N 5511. THANKS.

Answer:

In this specific case, yes.  5511 equals the 11th week of 1955. 

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