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i think the power was supplied by the same plug used to connect the tuner to the amp/power supply chassis, you plugged in the adapter, then plugged the tuner power cable into the mpx decoder. the switching to defeat the mono bridge connection between the two channels is automatic in my Motorola, contacts built into the audio jacks. Some Motorola MPX units were tube, but some had like 1 tube and transistors as well.
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