Buzz in sound from video - a porthole

[kramden66]

tried the adjustments as stated , the quad really doesn't do too much , the way it is now if you set to good contrast , not too much it has a loud buzz , if you adjust it so it is grey with just barely enough contrast it is tolerable , if you adjust the agc to wear it is very grey and almost no more signal the buzz is pretty much gone , maybe the cap on the quad is shot
tried more then one 12at7 with no luck