Spent some time this evening on alignment of the color demodulator. Followed the RCA manual for the Chroma AFC, Chroma bandpass, and Color Matrix adjustments. Fortunately I've got an old Sencore color bar generator that generates the I and Q type pattern the RCA manual instructions are based on. Had to spend some time with the Sencore and a modern color set first to get the color bar generator working well enough. After alignment, it looks like this CT-100 can produce some decent looking color.
Purity is not good (see first pic), regardless of adjustment of the cross purity adjustment and field cancellation. Best is with no current in the purity coil (unplugged, or adjustment fully counterclockwise). Would you guys say this needs degaussing, or something else?
If it needs degaussing, can the field cancellation coil be drafted into service as a degausser with a variac, or is that coil capable of too little current and field to do the job? (I also don't want to burn it out, of course.)
The remaining pics are simply showing that we now have reasonable color.
Convergence still has big problems, so that will be a project for another day.
Overall, we're getting closer...
