On 11/28/20 2:51 PM, Bill Notfaded wrote: > Good evening Don- > > I believe FEI made the USO's for Voyager1, 2, and others: > > http://adsabs.harvard.edu/full/2004ESASP.544..131A > More recently, APL has also been supplying USOs. Quartz, in a vacuum bottle for thermal isolation. Lots of blanks started to get the final product.