Buzz in sound from video - a porthole

[kramden66]

yes i get nice snow , the problem is not weak video it is a buzz caused by the video signal , it is not over modulated , tried a vcr , rf modulator and another rf modulator , all the same , what i said was if you turn the agc to wear it is weak and is so grey you are starting to lose sync the buzz is gone , increase the agc just a little and buzz is there but fain , increase to where it starts to be less gray and more black and white and buzz .
perhaps this means something , the buzz control when turned hits a point where the sound goes out and comes back , it acts more like a coil , perhaps the quad coil isn't right because it really has no effect on the sound yet it really should , or the little resistor looking cap on it is no good.