The capacitor values in the original JBL schematic are written in ancient ( & obsolete ) script ( that would easily confuse a youngster who's unaware that the written ( electronic notational ) conventions have changed over the decades ( & last century ) .
MF = uF ( in, todays capacitor parlance ) .
No doubt, the ( center-???)tapped inductor will be next to confuse & throw ( this un-named person ) for a loop ( &this little speed-bump isn't as easy to overcome / save winding one's own tapped inductor ).