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I found the original.
The image on your TV set has a seriously wrong "red" or "magenta" bar. The exact nature of the problem ... undersaturated ... is very frequently
that the main video carrier is at an improper spot on the IF response slope.
I strongly suspect that all your set now needs is a full IF and possibly but less likely also RF alignment, and getting the AGC working right. The AGC won't work
right unless the video carrier is at the right spot on the slope.
The CTC-5 at the ETF which I worked on last spring has the exact same
problem.
You seem to be a patient person. Its perfectly possible to align a TV
with nothing but a plain signal generator and an analog voltmeter! Just
use the bias box you already have to override AGC and meter at the
video detector, plain DC. You can in a pinch even use the second harmonic
of the oscillator of a SW radio, you just have to take into account of that
oscillator's (typically 455 kHZ) offset from the dial. I've actually done that
in a pinch!
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