A GPT LCL CTLR CLRS A C550 TO LAND BEHIND A C130 MAKING A LOW APCH WITH LESS THAN THE REQUIRED SEPARATION FOR WAKE TURB.

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C130 IN L TFC RWY 32; C550 RWY 32 VISUAL APCH. TFC ISSUED TO C130 MAKING L BASE; THEN C550 CHKED ON THE FREQ AND TFC ISSUED TO C550; 'C130 AHEAD AND TO YOUR L IN FRONT; C130 MAKING TOUCH-AND-GO OR LOW APCH.' APPROX 30-45 SECONDS LATER; C550 ADVISED HE WAS MAKING A 360 DEG TURN ON FINAL BECAUSE OF THE ACFT AHEAD OF HIM. I ADVISED THE C550 NEGATIVE; THAT TFC FOLLOWING WAS A HVY KR35; SO I COULD NOT APPROVE A 360 DEG [CIRCLE]. I THEN CLRED THE C550 TO LAND RWY 32. THE C550 CONTINUED AND LANDED WITHOUT INCIDENT. WAKE TURB SEPARATION WAS NOT MAINTAINED. 2 FACTORS WERE: 1) THE C550 COMING TO MY FREQ LATE AND NOT GETTING THE C130 IN SIGHT; ALSO 2) THE INEXPERIENCE OF THE FLT CREW MAKING AN APCH WITH PLT TRAINING OCCURRING. A WAY TO RESOLVE THIS WOULD HAVE BEEN TO ALLOW THE C550 CREW SOME OTHER REQUEST EVEN THOUGH I COULD NOT APPROVE A 360 DEG CIRCLE ON FINAL. ALSO; GETTING THE C550 ON MY FREQ IN A MORE TIMELY MANNER COULD HAVE ALLOWED THE C550 FLT CREW TO ACQUIRE THE TFC AND MAINTAIN VISUAL SEPARATION; AS IS DONE ROUTINELY AT THIS ARPT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR SAID THE FOLLOWING ACFT WAS A C550 AND NOT A LEAR JET AS INDICATED IN THE RPT. HE SAID THE RPT WAS SUBMITTED BECAUSE THE C550 PLT WAS REFUSED A 360 CIRCLE BECAUSE OF HIS SPACING BEHIND THE C130 MAKING A LOW APCH. NO TURB WAS ENCOUNTERED AND THE C550 LANDED WITHOUT INCIDENT. HOWEVER; SEPARATION WAS NOT MAINTAINED.