Do you someone with that level of expertise who works on cassette decks? I have a TEAC 550 and a Sansui 3 head D-705 that need someone who knows more than cleaning and spraying with Deoxit.
No unfortunately I don't. Getting onto a stereo forum can be helpful if it's a good one, good luck! I used to have a Teac cassette, had DBX noise suppression, worked pretty good. Had some TDK MA-90R metal tapes, made some good recordings with that set up.