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You should be able to tell if the arc is comming throught the HV cup by the sound. If its somewhere else in the chassis, then its obviously not the cup. In these chassis, the pincushioning saturable reactor can be a culprit for HV trouble. Hopefully the fly is OK. Is this a 12B14C52 chassis? Should say on the paper tag ontop of the HV cage.
Dont worry about the residue. ITs typical on practially every zenith of this age. Its just breakdown of the HV anode cup. It becomes sticky and trying to clean it makes more of a mess and has no effect on the operation of the set.
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