Cassette deck head wear

1. Don't use Metal tapes
With metal tapes the head wears out 3x faster than with regular Type 1 ESPECIALLY on Nak decks.
2. I don't know the precise hours but with Metal tapes you can wear it out within probably 1.5years or roughly saying 5...6000 hours just like a cartridge life. Otherwise it would last much longer.

I prefere to use no Dolby on my RX202 deck and I'll try to use Metal tapes on that. Mine records near-perfect on Type1 tapes and I believe that it will be perfect on Metal ones. Years back I used cheaper tape deck that were realy affected by Chrom or Metal tapes and for my newly-acquired Nak one year ago I decided to use only Type1 normal bias tapes. What is the bias settings you need to use for Metal. I have on my nak switches for type1, type2, type3 and type4.