We don't usually work with YouTube video (we can't be responsible for the way YouTube re-processes video). But your tape would appear to be a second generation copy of another tape, made without a correcting tbc from another player.
If the tape is an original, it's not a very good master. In any case, my experience with ES10 and ES15 pass-thru units is that their manufacture went through several variations. Some of those units have tbc pass-thru active only on Line 1 input. The Line 1 inputs are on the rear panel of these machines, not on the front.
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