HAS TO MISS AN APCH BECAUSE OF INOP EQUIP ON THE ACFT.

Narrative

THE FIRST NIGHT ILS APCH LANDED IN A MISSED APCH BECAUSE THE DG STARTED ROTATING DURING THE APCH. I AM NOT SKILLED ENOUGH TO TRACK THE LOC WITH THE STANDARD WET COMPASS. DURING THE MISSED APCH MY RADIOS DEVELOPED A LOUD HISS SO THAT I ESSENTIALLY COULD NOT HEAR ANYTHING THE FACILITY (TWR OR APCH CTLR) WAS SAYING TO ME. I BELIEVE THEY COULD HEAR ME OK. AFTER 1-3 MINS I DETERMINED THAT BY RESETTING THE SWITCHES ON THE AUDIO PANEL NORMAL COM WAS REESTABLISHED. (I ASSUME THAT I HAD INADVERTENTLY 'TOUCHED' THE AUDIO PANEL DURING THE APCH; POSSIBLY TO RECHK THE MKR BCN RECEIVER; AND 'TURNED ON' ONE OR MORE OF THE AUDIO SWITCHES FOR THE L NAV RCVRS DURING THE PROCESS. THE TRUTH IS THAT I DON'T KNOW WITH CERTAINTY HOW I CREATED THE HISSING THAT COMPLICATED THE MISSED APCH PROC). TWR PERSONNEL BECAME AWARE THAT I WAS EXPERIENCING PROBLEMS (I ACKNOWLEDGED THIS TO THEM: CLB; CONFESS; COMMUNICATE; FLY THE AIRPLANE) AND ONE PERSON SEEMED TO GIVE HIS TOTAL; ABSOLUTE ATTN THROUGHOUT THE SECOND ILS APCH AND TOUCHDOWN PHASES. THE DG WAS 'STABLE' DURING THE APCH PHASE (FROM THE OM TO TOUCHDOWN).