Just a guess here. Please consider my lack of knowledge when reading this
I'm guessing (and it's ONLY a guess) it's MD, based on the FA - it still has a signal at the higher frequencies. I "thought" .mp3 had a definite cut-off at a certain frequency (not sure exactly where though).
Those little spikes in the SA - I'm guessing are due to noise on the tape.
Let's see when the real experts come around, what it really is
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