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The knocking sound is the high voltage trying to fire. That would tell me that the high voltage splitter has failed or one of the 3 picture tubes (not lamps) has failed. Most likely too expensive to repair a TV that old.
Sometimes High pitching its just that, static on the area, like if you are near a microwave, or near other electronic equipments, but, if the skreetching sound keep going or even if you do nothing it could be a line inside the sound card, or you need to clean the volume botton with special electrical cleaner. other that these, its contacts, or bad cap for the volume board inside.
sounds like a minor adjustment on the high side which is the micture screw to the filter side when it starts to die put the choke on partiallyit should recover breifly which will tell you its a adjustment on the high side
my solution to you is ask some one to check out your cvc joints cause once cvc joints go bad it starts to sound like your engines knocking but its the joints that are right next to the tire on the axel get under your car and look right behind the tire if there is a rubber here's a image of what the rubber on the axel should look like if its ripped or torn or even shredded thats your problem