you might read the owners manual of your mx114 if you have one!!
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From a sonic standpoint the best way is most likely connecting the tape outputs (left & right) of the MX-114 to the tuner inputs (left and right) of the MA-6200.
It would also be possible to connect the main outputs of the MX-114 to the tuner inputs of the MA-6200, but that would insert a lot of unnecessary circuitry into the signal path, including the volume control, balance control, and tone controls of the MX-114.