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Author Topic: Anyone ever seen this type M7 before?  (Read 1729 times)

Tim Campbell

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Anyone ever seen this type M7 before?
« on: June 06, 2014, 08:47:48 am »

Here is a strange adjustable tension M7.


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Re: Anyone ever seen this type M7 before?
« Reply #1 on: June 06, 2014, 12:42:59 pm »

The backplate looks like it was patterned after a standard-prescription M7.
This is pure speculation, but during and especially right after WWII, tiny manufacturing and home-made shops sprang up in Germany, which, lacking inventory and machinery, improvised on the basis of the technology that already existed: M7 backplates, PVC membranes, Neumann capsule head designs.

This could be one of them.
I am most curious to understand how the tension may have been adjusted (I see the extra small slot screws on the diaphragm frame) and why.

Klaus Heyne
German Masterworks®
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