Terminator (T1) audio

[STARSCREAM]

Watched Terminator last night and while I think the PCM track is really good for the age of the movie I did notice with some of the dialogue, mainly center channel with some of Kyle Reese's lines, that it sounds like distortion. Most of the dialogue is smooth and doesn't sound like this but some did. Just wondering if others hear it? I checked out some other movies afterwards and dialogue was fine so it must be T1's audio track. When things like this happen, particularly on older titles is it mainly due to the condition the film stock is in and maybe there isn't a better sample of that audio clip than what they have to work with?