I had a similar issue with my Beocenter 8000 – if yours is the Type 2 tape deck (which I believe the 9500 has?), it could be that the little cogs aren’t fully disengaging. This caused slow playback on mine. The auto-reverse did work sometimes on mine, but it was temperamental.
I was able to fix if from the brilliant advice given by @Dillen in this post. In my case I shaved a thin piece of plastic from an old credit card (really just a fraction of a millimetre thick, practically thin as paper), and glued it (using superglue gel, and applied carefully with tweezers) in the place seen in the photo you will see in that post. It instantly worked, and is still in full working order.
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