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Sorry I don't have any yokes, but, WOW! I had no idea they were still making 27" sets that late (before the 80's, of course).
Two thoughts that come to mind:
You may have to look through older inventories, since most 27'" b/w were made right after the 27" CRTs came out, about 1955. It quickly became evident that few people will willing to put up that much money for a b/w, and soon the market was dominated by 21" sets and a few 24" sets.
I also wonder if a yoke designed for a 24" set (or even a 21") may work with your 27". Looking through old tube manuals, it seems as through CRT manufacturers would introduce new tubes in groups. often bringing out, at the same time, 21", 24" and 27" CRTs with only the envelope different - same base, gun, design voltages and deflection angles - only the size different. They would also offer versions with and without aluminum backing, with and without tinted face plate, also electronically alike.
Good luck on your resto effort, I'd love to see it working!
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