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Q3301, the +12V regulator will fail, giving white screen and retrace lines. Intermittent at first, it could be your problem. RCA issued a Goldenrod of common CTC101 chassis problems - I'll see if I still have it.
Also, check the spark gaps at the CRT socket - flush them out with some Isopropyl (80% or better, not "Rubbing Alclohol") - the dirt will get conductive and lead to CRT bias issues, affecting the pix, including intermittent retrace lines.
Pin 5 of the CRT socket likes to get a cold solder joint - mentioned earlier, check all the connections to the CRT socket.
Also, a small coil on the CRT board was prone to opening up, but that would cause your problem all the time - might want to check the solder connections there too.
Cheers,
__________________
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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