On 12/29/2020 11:35 AM, Scott Dorsey wrote:
Paul Dorman wrote:
If Neumann is so secretive, then why did they agree to do a
"How It's Made" video on the U87? This video is WAY too clean to be
from the 60's!
https://www.youtube.com/watch?v=RTZy-ThRXeY
Because that video doesn't show anything important.
And I don't see anything too special here, really. Assuming
they use torque wrenches for the ring that mounts the plastic
membrane, it looks like any assembler could do it.
There are two things they will not show you:
1. How the backplate is made optically flat and parallel to the diaphragm.
2. How the diaphragm is tensioned.
The trampoline method that all the Chinese factories are using is the method
that Neumann used back in the fifties, and it can be done well with very
skilled people.
Based upon the clarity of that video, it looks to me like Neumann
still uses this method.
And since the Soyuz videos I posted are about 2 years old, it
looks like at least some Russians use the same method too!
Here is the video again. They hand-tighten the mylar into the
rings, and they do NOT measure the tension!
https://www.pro-tools-expert.com/pro...d-part-2-gsps6