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It's a complicated answer. It uses a kk47 style capsule that's been tweeked to fall within the frequency response range of my favorite M7, that is, a very slightly reduced presence peak @5kHz. No, it doesn't have the identical air (10kHz) of an M7 but, probably 1dB more than most kk47's.
Remember, it's not just "the capsule', or "the VF14 tube" that make a U47 tick, but a combination of at least 15 identifiable components and topologies that ADD UP to a U47. What this means is that you can put an M7 OR a KK47 in a U47 and it will still be a U47, and if both capsules are good, iether version of the mic is good. At that point it is a real matter of subtlety that will make you prefer one over the other, and it is a well documented fact that as many M7's (from U47's) have died out, they have very successfuly been replaced with KK47's without looosing the mic's "U47ness".
As to why we use the KK47 instead of the M7, the KK47 is easier to manufacture.
Hope this helps.
Regards
DB
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