You'll find the Sams for your Zenith in Set 2551, folder 2.
As to the RCA, the full chassis number is needed, as Sams lists about a dozen folders for the CTC177 series. A model number would be even better for searching.
Cheers,
__________________
Brian
USN RET (Avionics / Cal)
CET- Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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