It is described and tested by Olson on a classic JASA Olson paper.
Olson went as far as putting it inside a vacuum chamber so that the electromotive force (noise) produced by the motion of the diaphragm (ribbon) due to the thermal agitation of molecules imprinting upon the diaphragm (ribbon) could be measured.
It is very interesting that an electron tube head amplifier was prefered to be used instead of a FET because of its lower noise and absence of thermal noise.
Reference:
Microphone Thermal Agitation Noise - Harry F. Olson - Journal of the Acoustical Society of America
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