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Your TVs LOT [Line Output Transformer] may be got shorted. It can be replaced. There is no need to replace the picture tube. The noise you hear from your tv is due to this short. Contact any service technician or authorised service center.
hay friend take tyme and resolder all capacitors if sound contine cheak all capacitor with multimeter changeing sysstem storeing of power dischargeing loose connected if not noise sencer ic is overflowing too much presure volte
sounds like you are using componant cables.[ red,blue,green on the right side in back of the cable box for the picture, & red & white cables for the sound.] make sure the red & white cables are connected to the middle white & red outputs of the cable box to the tv's red & white inputs, not outputs. hope this helps.
Depending on age, it sounds as if picture tube has an intermintent short in the red gun. tap on the center of the screen to see if it goes away, if it does,I would strongly say that the tube is gone; but you could try openning it and check if the crt board is mounted on the tube's neck properly. do this at your own risk since you might get a shock if not familiar on how to handle tv's.
if tv have black screen,increse screen control to see vert ic is defective,and if screen is white with lots of line acrose ,you can find open resister,on pic tube board,or in main board near transformer.