What has changed in the playback set up of this open reel audio recording?
The tape was laced up the wrong way round
The playback speed has been corrected
It’s a different tape
I assure you it’s the same tape
Audio A is the result of an open reel tape being played on the wrong side of the tape. This is the backing of the tape and not the surface where the audio signal is held.
Audio B is the same audio laced up correctly with the oxide side facing the playback head. This is the side that carries the audio as magnetised particles.