CTC-9 Winslow

[Zsuttle]

Originally Posted by old_tv_nut

Does the color oscillator alignment have you ground the phase detector output to adjust zero beat? If so, what happens when you remove the ground? Is the oscillator unaffected, or does the frequency change?

Try putting a voltmeter on the control tube input and see what happens to the control voltage as you ground/unground the detector. See what happens to the detector output/control tube input when the detector is not grounded and you adjust the oscillator frequency very slightly off zero beat. Trace back to the phase detector and back further to see where you are losing either burst or oscillator input to the detector.

Well, the reactance coil got stuck. What I thought was the end was just a snag. Reactance adjustment has a lot more travel than I thought. The control voltage was not where it needed to be which tipped me off. I was able to get it locked in, and overall get a colorbar. It made a huge difference in the oscillator amplitude, which in turn corrected the burst amplitude.

Colors are wrong, and some of the colors look pastel, but overall there. It feels like there isn't enough chroma? I can't get some of the colors to where they need to be without messing up the other colors. Eg, to get white, the rest of the colors are wrong. The colors are easily washed out by the brightness

colorbar.jpg

Originally Posted by Alex KL-1

Well, sounds like a parasitic oscillation making rectification in some IF stage (so it throw a large negative voltage, to almost cutoff). But can be another things... difficult to predict, imagine or point out.

Yeah, hoping it doesn't come back. It hasn't so far. Time will tell