CTC-9 Winslow

[Alex KL-1]

Originally Posted by Zsuttle

I was able to determine that the AGC was taking out the tuner and the IF stages. Still no clue as to why, I used a fixed voltage supply for troubleshooting the AGC and when I was finished, the AGC started working normally. Weird...
...........

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.