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gEDA-user: Cryogenic / Ceramic Substrate PCB Material?

Has anyone here ever done any work with cryogenic circuits?
The application is some ultra low noise amplifiers.

Does anyone know of which houses can make
PCB's based on Ceramic Substrate Material?

Would there be something better material to use
in Liquid Nitrogen than Ceramic?

http://www.interfet.com/  makes low noise parts
for this kind of work, anyone know of other obscure companies?



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