The tape you used in the demo is the worst tape you could ever use on a Nak TD-1200II. It sheds oxides on the tape heads like crazy. You're, in effect, ruining the nice deck by using cheap, normal position tapes.
This Maxell UR is brand new manufactured at 2005 (one of the last manufactured cassettes). No oxide in this model. Never mind, for a car cassette deck I use only normal position tapes. The others chrome and metal tapes I use on my decks in the Dragon, BX300E, 482, Hitachi D5500M, the Technics B905 & 965 etc.
