Olympic 950 almost done - sound buzz issue/questions

[kramden66]

ok here it is I get a buzz in the audio that when you turn the volume up all the way it goes away but its not practical to blast the set , it seems to be from the video somewhere because if you turn the contrast down it goes away or becomes more quiet , if you turn the contrast up all the way it gets the loudest , so my question is this could there be something I can install somewhere like a cap that would help filter this ?
its not the sound ifs or adjustments ,its not the ground of the volume control either..... any ideas here ?
thanks
mike