John Peel's record collection online

the sound quality sounded a bit rough on the first couple i listened to, volume upping and downing it was the very start of a couple
is that just because the person doing the reordings C90 cassette was a bit worn at the start of the tape ?
how was the quality will ?

FLAC quality or MP3 ?

Just started listening tonight; the one from 1975 that I am on now is excellent quality. Can followed by Laurel and Hardy's 'On the trail of the lonesome pine'.