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Finally got around to scanning the manual I have for the Fairchild 523. This is for the original 523-J1 model from 1948 - which was 2 speed (33-1/3 & 78) and had manually continuously adjustable LPI between 80 to 160 LPI. I have a later unit (serial #141 which I believe is from the early 50's) which is 3 speed (33-1/3 / 45 / 78) and LPI range of 80 to 400.
You can download the manual athttp://www.totalsonic.net/fairchild/Fairchild_523-J1_manual.pdf
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