I'm sorry, I should've read the thread more careful.
In your sample the area above 18kHz looks almost white. An unaltered analogue source should show more grey and not that steep drop in frequency response.
How could this happen?
A lossy codec (f.e.
atrac 3+),
a digital low pass filter/noise reduction,
by altering the tone pitch of the recording in a digital way. Maybe the one who transferred it, ran the vinyl too fast and someone corrected it afterwards on the computer.
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