04-09-2012, 04:41 PM
Acording to the schematic (bottom of page 7) this shield was added as a change in production placed between the 47 and 80 tube so I guess it would depend on the tube lineup or production run of your set if it needs or ever had it.
http://www.nostalgiaair.org/PagesByModel...013881.pdf
http://www.nostalgiaair.org/PagesByModel...013881.pdf