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Odds are the phono and TV inputs are connected together, and the switch is just a radio-input switch with extra positions to act as a tone control.
It is rare to find a 78 rpm era crystal cart that still works worth a damn. There are two options get it rebuilt (IIRC west-tech services is a rebuilder), or replace it with a modern cart with a larger 78RPM appropriate stylus, and possibly add a stage of preamplification to compensate for the possibly lower output of the new cartridge.
The TRK 12 never had a built in phono so you don't really need to keep the phono that came with the radio chassis.
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