Quote:
Originally Posted by old_tv_nut
hooray!
The coils in the detector circuit are not for peaking, but for suppressing the IF frequencies and harmonics. They must have continuity to pass the detected video to the first video amp. I think what you see with the coil open is a weird DC clamping effect involving the first video amp grid.
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Being pretty new to this I have heard about peaking coils going bad and I was wondering what is usually the cause of failure? Is it always a open coil or does the resistor ever go open or change value. And what causes them to go open -excessive current -physical damage?