What makes Telefunken tubes sound better?

The Quality of the Telefunken Tubes was (or is) based on extreme quality control of all parts, a connection with engineers and mechanics how to get the best possible results. Telefunken Tubes have different materials to guarantee the 10000h (or more), they were designed for shorts signal paths, they work with lower temperatures and the engineers found new solutions to reduce the gas pressure inside. They were made in a time, where maximum quality was the goal (comparable with old Mercedes Cars). This is also the reason why Reissues are ...well Reissues. Unfortunately there are also a lot a fakes in the market.
Some impressions

Telefunken E88CC
excellent details, transparent, accurate, 3 D effect, realistic and dynamic

Telefunken E188CC
sweet and clear, 3 dimensional, high resolution, dynamic

Telefunken CCA
perfect 3D resolution, clear and fine details, powerful and tight bass, dynamic, superb realism, transparent, sweet and airy sound

"Unfortunately there are also a lot a fakes in the
market." To date; no one has counterfeited the diamond,
molded into the bottom glass of the authentic(nine pin
miniature) Teles. Easy to spot a phony, or tubes that may
have been rebranded. In the case of Tele's octals(ie: EL34);
it takes a knowledge of their distinct cathode/mechanical
structure to avoid getting burned. A bit of hilarious
Telefunken history: (https://www.youtube.com/watch?v=Lqvvu9ZZfmY)

BTW: Don't give me any static about the stereotyped tubes, in
that video! =8^)

I was told materials used in making NOS tubes are no longer available or banned so quality suffers.

Telefunken 12ax7 and 12au7 ribbed plates are my favorite. Telefunken e88cc is very good but I prefer 60's Siemen e88cc. In my components, Siemen e88cc even best 60's Siemen grey plate Cca.

What I do see with Telefunken 12AU7's that is different from all but triple mica tubes is a mica ramp situated between the plate spacer posts and the getter.