Here is a page that has some information on the FE-5680.
http://vk3um.com/Rubidium%20Intro.html
Near the bottom the is a link to an article by VK3GJM that talks about
rejuvinating Rb lamps. This may be of help.
Peter,
Somewhere, I have read an article about 'resurrecting' a 'dead' Rb bulb. I
think it was done with heating but I do not recall. I probably have the
article squirreled away somewhere and I can probably chase it down if
someone else on the list does not come up with the link first.
Are you familiar with what I am talking about?
Joe
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