This is a quote from Martin Schneider from Neumann, Mic. Development. He stated it in the PSW Recording Forum.
See:
PSW Recording Forums: Klaus Heyne's Mic Lab => TLM 103: Can It Be Improved?
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Hello again,
the TLM103 capsule was designed as it still is nowadays, and it has never changed. The capsule design is a modification of the U87 capsule. It has an average rise of 2...3 dB in the treble between 5kHz and 15kHz (in the lower tolerance range of the published specs). It's one of the mics with the smallest actual tolerances in production, so they all sound the same.
Two notes:
- you could also have asked us directly, on the Neumann forum, and got a faster answer.
- Mic models do differ, for different applications. If you don't like the TLM103, and prefer mic XYZ.... well, just take mic XYZ.
Best regards,
Martin Schneider / Neumann Mic. Development
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Hi CAT5,
There are probably some people here who are a curious about the differencs between the 1998 TLM-103 version and the latest one.
We bought one in 1998 (it got lost over the time) and it was good for our young 'Mackie 24/8, Audiowerk' spoiled ears in these days. I've just bought the latest version but I can't remember if it sounds equal to the one we once had (our female singers from the 90's have past the thirty mark and are retired now

It would be quiet interesting if you find the time to compare old vs new in a recording.