This is an example of an all-American 5 tube set tubes.
Certain Capacitors in Radios without a power transformer should be Safety Rated.
Those that are across the AC line as is C10 can be X or X/Y-Rated. These would be flame resistant.
Capacitor C4 must be a Y-Rated since a short-circuit could cause lethal voltage to be present on the main chassis and exposed metal parts.