ACR X TCASII TA RA WITH VFR ACFT. EVASIVE ACTION TAKEN. SEE AND AVOID CONCEPT.

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PRIOR TO LEVEL OFF AT 10000 FT; PHL DEPT ADVISED ACR X THAT SLOWER TFC WAS AT OUR 7 O'CLOCK POS CLBING TO 9500 FT. AFTER LEVEL OFF AT 10000 FT; WE WERE CLRED DIRECT PTW VOR; MAINTAIN 10000 FT AND CONTACT ZNY FOR HIGHER. AFTER ACKNOWLEDGMENT AND FREQ CHANGE INITIAL CALL TO ZNY WAS UNANSWERED THEN GOT TCASII TA. TFC NOTED AT 3 O'CLOCK ON SCREEN AND CLBING 3-4 NM APPROX 9000 FT. SHORTLY THEREAFTER GOT RA; STILL UNABLE VISUAL CONTACT. INITIAL RA WAS TO DSND FOLLOWED BY AN ALMOST IMMEDIATE CLB COMMAND INTRUDING ACFT SYMBOL INDICATED 2 NM CLBING 9600 FT: AUTOPLT WAS DISCONNECTED AND THROTTLES ADVANCED; CLB INITIATED; CLR OF CONFLICT AT 10600 FT. THEN ATTEMPTED ANOTHER CALL TO ZNY TOLD THEM WE WERE CLBING TO 11000 FT. ZNY THEN ISSUED CLB CLRNC TO 13000 FT. SHORTLY THEREAFTER ZNY ASKED IF APCH HAD NOT ADVISED US OF THE TFC. WE TOLD THEM THEY HAD BUT NEVER ACQUIRED VISUAL UNTIL AFTER RA AND CLB HAD BEEN INITIATED. I RECOMMEND THAT CTLRS NOT VECTOR ACFT WITHIN TCASII RA PARAMETERS ON THE ASSUMPTION THAT VISUAL CONTACT WILL BE MADE PRIOR TO RA ACTIVATION AND SUBSEQUENT EVASIVE ACTION BEING TAKEN.