Originally Posted by
surreal
iirc, the very early cyclones had no b-screws, but they ended up getting them later? I wish i had one on hand to take a closer look... (of course, there's several iterations/variations of cyclone RDs anyway.
-rob
For the record, I have a Cyclone that is date coded October 1975 which would place it as the first year of production. It does have a B-adjustment screw.
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