Is there a reliable way to identify if the high frequency squeaking in the reproduced audio is caused by sticky shed syndrome or other kinds of degradation or it was rather in the original recording? Can squeaking be identified to have e.g. a specific frequency? 

The squeaky tape has a backcoat: BASF LGS 26477

It does not seem to shed any deposit on pinches aor heads, so I am unsure if it would be advisable to try to bake.

Thanks and best regards

Gregorio Garcia Karman
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