|BBC microphone testing department?|
Below are links to some of the reports that relate to ribbon microphones. In many cases there is a lot of interesting technical data. The rest of the articles can be accessed here.
The Crosley ribbon velocity microphone.
Tannoy Ribbon Microphone
Lustraphone VR53 ribbon microphone
The design of the PGD and PGS ribbon microphones.
The EMI microphone Type 2351E.
Tannoy microphone Type MD. 422.
Design of the PGD and PGS Ribbon microphone Part 2
(Thanks to Santiago Ramos for sending the links.)