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the B probably is the later version with alterations like the little knob and maybe the cabinet too , i have an emerson i think 644B , the difference is two knobs were removed from the front ( like the 10" version has ) and located in the back and they actualy have knobs on them in the back , other emersons from that point on also have just the two knobs in the front , so i'd say the sylvania is a later production with alterations
mike
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