Cute cat.
Quote:
Originally Posted by dazzer1975 
what production run does orange coloured diaphragms denote and is there a sonic difference between the production periods? From what I understand the runs are categorised as early mid and late, but I dont know what years corespond to each period.
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Orange is Early Period, white with orange ring is Middle Period, all-white is Late Production. Each revision has progressively less bass. Years would be late 70s early 80s I believe, don't know percisely.