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Two things to check - your AGC control setting, and all 100K ohm or above resistors around the sync separator and horiz osc. tubes. We kept a drawer full of 100K, 120K, 180K and 220K resistors for those RCAs and the ones with the 13GF7 Vertical tubes. They would go up in resistance by about 20-30% and cause problems. Also, if the set has the original Horizontal AFC diodes, replace them - any silicon diodes should suffice. The AFC diode is a black block about the size of a starburst candy, with three leads. They go bad all the time, and cause no/weak sync. The one in your set is a replacement, but not an RCA numbered device - probably an aftermarket one or from another set.
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Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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