Just the sound of the Enterprise in the exterior shots is the tipoff. The rumble is present in all of the second and third season episodes, but it wasn't used after the first season. I wasn't even used in every episode of the first season, but some episodes, like "The Naked Time" have a unusually loud rumble on the mono track where there wasn't one before.
If you have Amazon Prime Instant Video, check out the original effects episodes of the third season. For just about every episode, they're the original sound mix. I don't know why they stuck older prints on there, but I'm grateful. Just compare, say' the "original mono broadcast track" on the Blu-Rays to what's on there. Day of the Dove, for example. No rumble and even Shatner's "that'll take us out of the galaxy" is a different reading. Ch-ch-ch-changes!
If you have Amazon Prime Instant Video, check out the original effects episodes of the third season. For just about every episode, they're the original sound mix. I don't know why they stuck older prints on there, but I'm grateful. Just compare, say' the "original mono broadcast track" on the Blu-Rays to what's on there. Day of the Dove, for example. No rumble and even Shatner's "that'll take us out of the galaxy" is a different reading. Ch-ch-ch-changes!
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