Question Revox B77 MK II reel to reel tape recorder slowing problem

Apr 3, 2020
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Thanks so much to get me in the community. I wish all of you and the human being overcoming the struggle against the corona virus. I'm a medical doctor (Cardiovascular surgeon) in Istanbul. Recently I've begun in interesting with vintage reel to reel tape recordings and bought some of them from second hand sellers. My problem is, one of my devices (Revox B77 MK II) slows down both while recording and playback when exceeding the half of the reel band. Is there anyone experiencing such a problem and can help me. Thank you.
 

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