My original PT TT bought in the late 70's received its final upgrade to PT2 V1 status in Dec 2008. However, I am confused about its V1 status as it has one drive pulley and I understand that a full vector upgrade has three pulleys. So - does the TT have a partial vector upgrade and, if so, what would this have entailed? (noting that I was not given a description when invoiced for the upgrade!). Also, can a standard drive belt be used as the current belt is slipping?