What phonetic features does the Boston Brahmin accent have? When I heard it, it sounded very similar to RP, but it definitely had some very different features.
Features of Boston Brahmin
I'm familiar with modern New England accents, but I really don't know a great deal about the Boston Brahmin accent. I think the early-20th-century "international theater accent" that's described the "International accent" thread might be something like it: non-rhotic (or perhaps "derhoticized rhotic", possibly preserving distinctions like "spa-spar" and "law-lore"), preserving the cot-caught and father-bother distinctions, and raising the "bath" words to [a:]. I suspect it may have been likely to keep the witch-which distinction.
Correction:
"...that's described *in* the "International accent" thread..."
"...that's described *in* the "International accent" thread..."