AN LR24 CREW MAY HAVE BEEN OFF COURSE. ACFT EQUIP PROB 'WEAK' VHF; VOR; AND AUTOPLT.

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ACFT DEV OFF COURSE; ALTHOUGH ALL INDICATIONS INSIDE ACFT SHOWED NONE. AND LATER ON; ATC WASN'T SURE EITHER. ACFT WAS PICKED UP IN TAMPA AREA TO BE FERRIED TO SALT LAKE CITY FAR PART 91. ACFT WAS A VERY EARLY LR24 WITH A LOT OF UNKNOWN PROBS TO THE CREW. PREFLT TOOK OVER 2 HRS. A FEW THINGS SHOULD HAVE TOLD ME RIGHT AWAY THAT ACFT WAS NOT VERY SOUND. BECAUSE OF GOOD WX FOR THE WHOLE TRIP (IN DAYLIGHT); I DIDN'T MAKE A BIG DEAL OF A FEW MINOR PROBS WITH ACFT (EXAMPLE: WEAK RADIOS; WEAK AUTOPLT; ETC). ON THE STAR INTO SLC; RADIOS GOT VERY BAD; APCH SAID WE SHOWED TO BE OFF COURSE A BIT; AND LATER EVEN THEY WEREN'T SURE IF WE WERE. BOTH NAV AND COM WERE VERY WEAK. LESSON LEARNED: THIS ACFT WAS OLD AND KIND OF RUN DOWN. I WAS GIVEN A COPLT WITH ONLY 100 HRS IN TYPE; AND HAVE NEVER SEEN THIS ACFT BEFORE. I LEARNED THAT YOU HAVE TO BE VERY INQUISITIVE AND SELECTIVE AND LOOK OVER EVERY DETAIL; EVEN THINGS THAT YOU TAKE FOR GRANTED; BEFORE ACCEPTING A FLT IN AN UNFAMILIAR ACFT WITH A NEW COPLT.