I had pretty intense arcing out from the CRT connector on a similar Motorola when I first started messing with TV over 40 years ago. Optimal time of year for that nonsense! I had to clean the CRT and then the connector suction cup rubber with silicone to get rid of all the tracking. The HV rectifier was a 3A3, like what a color TV used, so I know the HV was higher than normal BW sets.
What is the chassis number? Mine was CDTS581YA totally all-gray metal 19" cabinet, like my avatar.
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"When resistors increase in value, they're worthless"
-Dave G
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