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Some of the "popping" may be coming from the old dried out anode cup on the CRT. Zenith used rather small ones that when cracked would arc to the surrounding area of the anode button. These did deteriorate and be sure to look at it. Possibly you may want to replace all of it to the 3AT2 HV socket with a quality cup. Taking a air hose and blowing out the set is a good idea and wiping down the CRT with Windex esp around the anode button helps too. All of that dust/dirt attracts moisture.
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julian
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