Re: Muffled sound on cassette player (Akai AD-F300)
If possible, view the head face in a good strong light with magnification, perhaps magnifying reading glasses. It's easier to see any muck on the head face as well as any wear.
The main error people seem to make is to merely "go through the head cleaning motions" without actually checking their work. Carefully clean it (not too much pressure or it may bend the head out of alignment) until you can see the surface is shiny clean and polished like a mirror.
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