[volt-nuts] What made a HP3458A so expensive

Mark Sims holrum at hotmail.com
Sun Jan 19 17:22:12 EST 2014

Some Russian company has a JJ standard that uses high-temp superconductors and liquid nitrogen cooling.  Because of things like grain boundary issues in the HTS,  it is not quite as good as a 4K cooled unit.
Of course at the
present time given the fact that the JJ has to be cooled to below 4.2 K
makes this idea more than a little impractical 		 	   		  

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