[time-nuts] FE-5680A Rb Questions

paul swed paulswedb at gmail.com
Fri Dec 16 09:05:06 EST 2011


Chuck Magnus and others will tell you the same reheat the lamp to evaporate
the Rb. I have done it also and it puts it right  back in the mid range of
life. Voltage wise. No way to know if it might plate out quicker with age.
The Rb reference were built with a finite life expectation 7 years I think.
Maybe 10. So most of the telco ones I have about 7 are at various stages
past midlife voltage. The ones I have recovered were down to I think 1.2V
reheating put them back at 5-6V or something like that I was quite happy
with the results.
There are indeed other components that can fail in the RF heater/exciter
caps and such in general replaceable. But use the right quality and
temperature replacement the ovens hot.
Regards
Paul.

On Fri, Dec 16, 2011 at 8:36 AM, Azelio Boriani <azelio.boriani at screen.it>wrote:

> Yes, of course, in that sense: the life must be restored at some time.
>
> On Fri, Dec 16, 2011 at 2:29 PM, Chuck Harris <cfharris at erols.com> wrote:
>
> > It has been pretty well shown that the lamp life is
> > effectively infinite.  The only thing that happens to
> > shorten an effective useful "campaign" of the lamp is
> > when the Rb plates out on the lamp envelope, and
> > renders the glass opaque.  That problem, however, is
> > easily remedied, by heating the glass until the Rb
> > evaporates, and then allowing it to redistribute to
> > a more desirable position out of the optical path.
> >
> > Disassembly, and a heat gun are all that is necessary.
> >
> > -Chuck Harris
> >
> > Azelio Boriani wrote:
> >
> >> I think every Rb has a finite lamp life...
> >>
> >> On Fri, Dec 16, 2011 at 11:41 AM, Neville Michie<namichie at gmail.com>
> >>  wrote:
> >>
> >>
> >>> Does the FE-5680A have a similar Rb cell to the LPRO-101?
> >>> If so do they have finite lamp life, (can you find the one you buy has
> >>> little life left?)
> >>> Or by not reporting the status of the lamp no-one worries about it?
> >>> cheers,
> >>> Neville Michie
> >>>
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