At this time Zenith chassis numbers are like this.
14K20
14= number of tubes
K= model year
20 is just a series number. The higher it is the better the set.
Since your model is an L model year it used last years chassis.
Best to find an original Sams, the quality is best. The new copies
usually suck. You can watch E-Bay for OEM manuals also. A lot
get listed & the bonus is most the time others are included.
73 Zeno
LFOD !
BTW I checked my Sams & I barely have any that old
