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The old (non AI) U87 and the U67 use the same capsule.
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Fopr the record, I believe it's the opposite. The AI uses the modern version of the K67...the old 87s take a K87.
I've used a lot of old 87s...and a few old 67s...the old 87s have all sounded, give or take a bit--the same. The 67s have each sounded very different. So YMMV.
The INnertube87 mod does not at ALL make it sound like a 67....if anything it takes it more toward the clean, high endy, C12 end of the spectrum. It takes away a lot of that "too thick" low mid thing...adds a sweet top...somehow makes the upper mid bump not grainy (still there-just not as raspy)...now, there may be other tube mods that ARE going for a 67ish sound.