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As David said, if I was really worried about shock hazards on old equipment, I would just replace the wall outlets with GFCIs. At about US$10 each, often less, that would be even cheaper than modifying plugs on several old devices used in that location, and would leave the devices themselves unmodified.
I remember in the mid-1970's, we had a TV with series-string tube filaments (also often the type with a hot chassis), and I touched some combination of its antenna terminal and some other object in the house, maybe a pipe or telephone, and I felt a moderate current, enough to get my attention. Nothing like my worst "zap", which was when I touched the unattached HV cap of a 23" B&W monitor chassis while it was still powered on. That event was more like getting hit by a truck.
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Chris
Quote from another forum: "(Antique TV collecting) always seemed to me to be a fringe hobby that only weirdos did."
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