I recently started using RTM C90 type I cassettes for recording mix tapes for my kids on my Denon deck. Quite like them. No need for Dolby C and +5 dB are easil

I recently started using RTM C90 type I cassettes for recording mix tapes for my kids on my Denon deck. Quite like them. No need for Dolby C and +5 dB are easily possible. All the NOS tapes I have used sounded awful. I guess this is due to chemical degradation over time (IANAC)