If you have a Nak deck that is working you have the best of the day. We did A-B tests...pretty hard to do and never really perfect, but we just played the record and the tape simultaneously and switched between preamp functions...best we could do.
Anyway, the only difference we could hear between the Nak 1000 and the best vinyl playing stuff of the day-probably Linn Sondek, but I forget, was a slight "hollow" sound from the tape deck. Otherwise, identical using Audio Research/Magneplanars from the mid-1970's.
I still have tapes like many of you, but my 2007 car has a CD player and the '66 Vette, well, music is not the first sound you want to hear in a C2 anyway, so...
Cheers!