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The noise is most likely from a high voltage arc. You could have a dirty 2nd anode connector on the CRT, a crack in the anode connector or high voltage cable going to the CRT, a cracked high voltage tripler (if one is used), a cracked focus divider (again, if one is used), a cracked housing on the flyback (HV) transformer, a CRT socket that is arcing for whatever reason, or a poor aquadag ground connection on the CRT.
Just be aware that there is around 25,000 volts on the CRT second anode and around 7 to 9 KV on the focus lead going to the CRT socket. And, there will also be up to several hundred volts in parts of the video output stage. Also be aware that the CRT (picture tube) and other capacitors in the chassis can hold a nasty charge, even with the TV turned off and unplugged.
A model number and/or a picture of the TV might be useful, as there were many different suppliers of TV's to Sears.
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