The style of set was only in the D- line brochure. as a D4754W.
The -9 means a later production with usually minor changes. They
are usually in the HV.
CM-121 sounds right BUT they may have supplements
like CM121 -S1 etc. Only the Zenith index will tell you.
Same idea with Sams The later # MAY cover the -9 sets.
Sams also have PCB's that are not on the web & you need.
Best bet is find an original Sams 1375 paper copy. A vast amount of these
sets can be fixed with any SM. Even the CC2 chassis is almost the same
just wrapped different !
BTW you HAVE to change ALL the 22-5001 with the right ones if they
are white. Orange ones a good. Change them dont test them.
73 Zeno
LFOD !