Maybe someone can help me with this.
I have a decent National RX-7000. I noticed now, that the speed of the cassette engine needs to be adjusted just a tiny bit. Unfortunately all the tapes recorded on it run to fast on other tape decks. Tapes recorded on other tape decks run to slow on the National. It's not a big issue but quiete annoying now that I have noticed it.
Is there any chance I can fix this on my own? I heard that the National seems to be pretty friendly when it comes to repairs.