CTC-16 Tint issue

[freakaftr8]

Hey guys, well I noticed lately the tint control is cranked all the way to green, and now it's at full tilt, the faces have been getting more and more pink. Thinking it's a demod or chroma burst issue, I swapped out the tubes, issue got worse with good ones, alot of reds and blues were way off but green was ok.. The original tubes are not really that bad, a little weaker than the NOS tubes I bought. What would cause this and has anyone had these issues before? Thanks