No. No. It is not Vic Perrin. It doesn't sound a thing like Vic Perrin, and I have no idea how that myth got started.
I'll check this when I get home tonight, but I believe this idea may have originated in Allan Asherman's excellent Star Trek Compendium
, in which Asherman speculates that the "Menagerie" version of the Keeper might have been voiced by Vic Perrin. As I said, I'm not entirely certain of this - I'll check my copy of the Compendium
when I get home tonight.
You're right about that.. It was only speculated that it was "probably" Vic Perrin.. As an audio engineer, myself, I can tell that it is simply Throne's voice pitch manipulated. You can really tell when you compare the B&W version with the DVD version. The inflections of voice and tone are identical..just pitched slightly higher. It would also make sense from a financial standpoint, having Throne voice the Keeper in the Menagerie when he is speaking directly to Captain Kirk, thereby only paying one actor to voice both parts. The Keeper's voice was pitch shifted to avoid confusion by sounding too similar to Throne, who apeared in the two parter.