CT-100 color sync issue?

[miniman82]

Bear with me here, I'm just gonna think out loud for a second...

Looking at the color bars, it appears red has bled (or shifted) over into magenta, and blue has bled (or shifted) into cyan. Looking at the vector described on your site, and taking into account the way the demod and matricies are wired in the CT-100 schematic, I'm lead to believe you may have an issue in the demod/matrix section of the set. Here's what I'm thinking: if the +Q signal were 'weak' in signal strength, would not there be more red (given that +I stays the same) leading to the mostly red bar where there ought to be magenta? It would also explain why the bar on the end that's supposed to be blue has shifted more towards cyan, since it takes -I and +Q to make blue (lack of +Q with unaffected -I).

Again, just thinking out loud and I'm probably wrong here. But if this were my problem, I'd start poking around with an ohm meter for drifted resistors in the I/Q demods (+Q specifically), or possibly weak demod or adder tubes.