Schulze are linked to Berg. I think they may assemble his receivers but I am unsure. They may even share circuitry and components. Can anyone advise on this?
Per Peter Berg: Schulze's license to manufacture Berg-designed receivers has been terminated as of September 2004.
Berg is now a part of Castle Creations. I would expect that they will be manufacturing the Berg designs in the near future.
As far as using a JR Xtal in a Berg, it would be very easy to just ask Peter. No doubt he will say it is fine, but why not get this sort of info directly from him? He designed the product. He may be reached at info*AT*bergent.net (replace *AT* with @).