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@rive_gauche
rod's the broadcast engineer, but here's a possibility:
neither the TV nor amp have a 3 pin (LNE) connection to the socket because they're modern double insulated devices. The TV has more (relatively) high power rectification requirements, and probably doesn't have the quality of build the amp does. So harmonics are produced that are not adequately absorbed by the TV and they leak along available connections as they seek a path back to the general mass of earth.
Possible solutions -
provide earth path back to mains for TV and amp
connect TV and amp together with shielded RCA connects
insert RLC attenuator between TV and amp
install a common 230VAC power supply for the TV and amp