Ah yes the "Custom" series sets. The first time I saw one it looked
cheap for a Zenith. I was not happy with the pix at all also. Went to the service manuals & found out why. We started modifying every new set that came in.
I proudly told Roger Eaton the Zenith service rep for most of New England.
He told me never tell Chicago & I know nothing ! With the mod they looked very
good & held up very well.
Jungle IC sockets were trouble on Sanyo / Sears, NEC, & Fisher.
Often got cold joints without a socket also.
Better sets used a 9-214 board that worked fine. Had a comb filter & AKB.
Known as "Advanced System 3" They threw a fantastic pix.
Enuf fer now
73 Zeno
LFOD !