ACR MLG LOST RADIO COM AFTER TKOF ACCOUNT RADIO AUDIO ACCESSORY UNIT IN E AND E COMPARTMENT SHOOK LOOSE FROM CONTACTS. RETURN AND LAND VFR.

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AFTER TKOF; WE ATTEMPTED TO CONTACT DEP CTL; BUT WERE UNABLE TO DO SO ON EITHER RADIO. UNBEKNOWNST TO US; THE AUDIO ACCESSORY UNIT IN THE ELECTRONICS/EQUIP BAY HAD SEPARATED FROM ITS CONNECTOR AT ROTATION; CAUSING A FAILURE OF BOTH RADIO XMITTERS; COCKPIT TO CABIN P/A AND INTERPHONE. AFTER LEVELING AT OUR INITIAL ALT; WE TRIED TO RECOVER WHAT RADIO CAPABILITY THAT WE COULD AND SQUAWKED 7700/7600 APPROPRIATELY. AFTER CONSIDERING OUR OPTIONS; WE DECIDED TO STAY VFR AND RETURN TO CLE. WE FLEW TO THE DRYER VOR AND FLEW A FEEDER ROUTE TO THE NDB APCH RWY 5R (THE ILS WAS OUT AT THE TIME). ALONG THE WAY; ATC ESTABLISHED A LISTENING CONTACT WITH US BY USE OF THE IDENT ON THE TRANSPONDER (RECEIVERS WORKED OK ON DEP CTL FREQ IF WE TURNED UP RADIO VOL REALLY HIGH). CLRNC TO LAND WAS GIVEN FOR RWY 5R AND WE LANDED W/O FURTHER INCIDENT. ON T/D; THE ACCESSORY UNIT WAS BUMPED BACK INTO PLACE AND THE RADIOS WORKED OK. DOESN'T SAY MUCH FOR MY LNDGS; BUT IT DOES SAY SOMETHING FOR LOSING RADIOS IN A MODERN DAY PART 121 CARRIER. IT DOES HAPPEN! THE AUDIO ACCESSORY UNIT WAS RESECURED PROPERLY AND THE FLT CONTINUED ON TO MSP.