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I pulled my Dad's Sams 1180-1 folder - man that schematic is huge. C760 is circled with "no chroma". Looking at the pix of the main video/chroma board, the cap is a polystyrene cap - silver foil with clear body. My guess is heat kills the cap, which is right after the last Chroma Amp, before the demods. If you decide to replace it, it appears to be the only polystyrene cap on the board, and is on the right side (looking at it from the back of the set), halfway between the 6MK8 Z-X demod tube and the 6GH8A Oscillator, and is next to a stand-up adjustable coil. Replace it with a dipped silver mica - 220pF, 300V or more.
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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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