I think this set doesn't use a power transformer, that means that the chassis may be "live" (connected to one side of the power line). This is an added danger if you touch the chassis while it is plugged in. The best way to protect yourself (and sometimes test equipment) is to use an isolation transformer, but for one set it probably isn't worth the expense. A good many radios were hot chassis also.
Zenith had a larger chassis (21", I think) version that did use a power transformer.
If you haven't worked on vintage equipment before be aware that things like cardboard, rubber and plastic get brittle and stiff with age. Replacements can get very difficult to find.
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