[Sabbathomaniac]

Originally Posted by magoo666

Hi, thanks for your reply, here's a sample if that helps

Thanks, yes, this helps. This is not an exact science, but here's my 2 cents:
If I didn't know anything about this recording, I would say it has to be either lossy-sourced or crudely denoised. That's what the "lego block" pattern at the border of the colored and the black areas in the attached screenshot tells us. If you know that this is either from DAT or from MiniDisc and that it hasn't been denoised, I am 99% sure it is from MiniDisc.