The tractor beam line, for example, sounds like he’s off saying it in a broom closet instead of on the same set he says all his other lines. The line itself it fine, it just… doesn’t blend for me, even on the mono mix. Probably in the minority on that one, but this stuff is pretty subjective at some point.
I guess it wasn’t my imagination. According to the info at the link Moth3r provided, “according to Anthony Daniels, C3PO’s tractor beam line was recorded long after filming had finished, on his own in a broom cupboard in London”.