Quote:
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...
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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.