RADIO COM PROB -- ACR LOST ITS COM RADIOS WHILE ON A STAR. FLC CONTINUED THE RTE AND THE APCH TO A SUCCESSFUL LNDG.

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I WAS CAPT MAR/XX/95 ON A FLT OAK-ONT XA00 LCL. CLRED TXWY Z USING THE FLT INTERPHONE; IT BECAME INOP AND STUCK IN THE 'HOT' POS. I WAS NOT ABLE TO USE EITHER THE #1 OR #2 XMITTER TO TALK TO ATC. ALL COMS TO AND FROM THE ACFT WERE BLOCKED. I NOTICED WE WERE PAST THE HOMELAND 152 DEGS AND DIRECTED THE FO TO TURNDOWN THE AIRWAY. I COULD SEE AN APCHING PROB AS WE WERE STILL AT 14000 FT MSL AND THE ARPT WAS ONLY 15 MI AWAY. WE DSNDED TO 10000 FT AND LOWERED THE LNDG GEAR AND FLAPS TO 40 DEGS AS WE PASSED THE PETTIS NDB. I COULD SEE WE WERE TOO HIGH. WX AT ONT WAS 400 FT OVCST 1 1/2 MI VISIBILITY IN RAIN AND FOG AND I DID NOT WANT A GAR. I TOOK THE ACFT AWAY FROM THE FO AND MADE 2 R HAND TURNS OVER THE PETTIS NDB DSNDING TO 4200 FT. I INTERCEPTED THE RWY 26L ILS AND COUPLED UP THE AUTOPLT TO NORMAL LAND. TWR GAVE GREEN LIGHT TO CROSS RWYS AND FOLLOW ME. TRUCK DIRECTED US IN. I FAILED TO SQUAWK 7600; AND HOLDING AT PETTIS WAS NOT IN PROPER PATTERN ALTHOUGH ON THE CORRECT SIDE OF HOLDING PATTERN. TIME WAS A CRITICAL FACTOR IN THIS SIT. IF I HAD MORE TIME; I MIGHT HAVE BEEN ABLE TO USE #3 RADIO OR RESET CIRCUIT BREAKERS; BUT THIS WAS A FAST OCCURRING PROB THAT REQUIRED FAST ACTION.