ACR FLC INITIATED EVASIVE MANEUVER AS U90 APPLIES VISUAL SEPARATION WITH A C130.

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WHILE ON DSCNT IN TO TUS; TUS APCH GAVE US A CLRNC TO 8000 FT AND ADVISED US TO CALL THE ARPT. AT 8000 FT AND 30 MI W OF TUS; I ADVISED THE FO TO TELL ATC WE HAD THE ARPT. TUS RESPONDED WITH A ROGER AND THEN BEGAN A RATHER LENGTHY COM WITH A VFR ACFT WHO WANTED RADAR ADVISORIES. HAVING JUST ENCOUNTERED SIMILAR CIRCUMSTANCES ON THE PREVIOUS FLT; THE FO AND I COMMENTED 'HERE WE GO AGAIN' AND I BEGAN SLOWING THE ACFT IN PREPARATION FOR THE COMING SLAM-DUNK APCH. WE HAD JUST DECIDED TO QUERY ATC ABOUT A FURTHER DSCNT CLRNC WHEN THEY ADVISED US OF A C130 AT 1 O'CLOCK POS AND 5 MI AT 8000 FT -- THE 4 VISUAL APCH CLRNC. THE CTLR RESPONDED THAT HE THOUGHT HE HAD ALREADY GIVEN US A VISUAL CLRNC. I BEGAN A DSCNT TO AVOID THE C130; AND THE TCASII SUBSEQUENTLY GAVE US A DSND RA; SO I INCREASED MY RATE OF DSCNT. THE CTLR CLRED US FOR THE VISUAL WHILE ALL OF THIS WAS OCCURRING. THE C13O PASSED ABOUT 1 MI BEHIND AND 500 FT ABOVE. SINCE WE HAD ALREADY INITIATED A SEE AND AVOID MANEUVER; THE RESPONSE REQUIRED BY THE RA WAS NOT AN ABRUPT MANEUVER. WE CONTINUED FOR A NORMAL LNDG AT TUS.