The problem here in my oppinion is that a clear answer is almost impossible. Except in very artificial and overly emphasized types of speech, words tend to merge into each other, especially very common ones such as "of". In most types of English, I would say that a sort of "sonority principle" applies.
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rachayI was wondering if the pronunciation of the word 'of' is always the same /?v/.Yes. It always is "the same", at least in the variety of English that I speak. It never has /f/. However, the /v/ often seems to be dropped, leaving only /?/, especially in faster speech. I think people do put their mouths (lips, tongue, throat, etc.) in position for the /