Back in 2005 I got one of the FE-5680A rubidiums. The one I got came on
the full original circuit board. I thought I would make up a PDF to show
what the original board looked like and the kind of heat sink they
mounted it on.
The board is large and has about 140 sq in of almost solid ground plane
on both the top and bottom.
The PDF that I created is here...
http://www.xertech.net/pub/5680A_Board.pdf
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