Hi Mike,
The Rb lamp voltage is just a guide. If your Rb isn't working, then it
is important... If it is, it is just a guide.
If your bulb is clear, and it is glowing, it is probably also working.
I seem to recall from HP's descriptions of how their 5065 was made
that the lamp, and filter cell are a specially matched set. Just any
lamp is not necessarily going to work with any filter cell.
-Chuck Harris
Mike Niven wrote:
Thanks for the comment Bob. Tracing Efratom through the ages, I see they are
now
Microsemi. I wonder whether they will still have a lamp for such a geriatric Rb
source and at what price - probably more than the cost of the complete Racal
9475? I will follow it up anyway as I hardly ever see working or scrap FRKs for
sale in the UK. --------------------------------------------
On Tue, 28/7/15, Bob Camp wrote:
Hi
The Efratom bulbs have a “magic mix” of gas in them. The only place I have ever
bought them is direct from Efratom. They were fairly expensive back in the
early 90’s …
Bob
On Jul 28, 2015, at 9:56 AM, Mike Niven <mfniven at ymail.com> wrote:
Would anyone know of a source of the Rubidium bulb fitted in the Efratom FRK
(and probably other FRx) standards? I have repaired and refurbished my Racal
9475, which is fitted with the older style FRK (not -H or -L) module. It is
working properly at present but the lamp voltage is down to 5.5V, which is
below the stated minimum of 6V. I have tried rejuvenating the bulb using a
hot air gun, as described by Corby, but this has had no obvious impact. Hence,
I have little feel for how much life the existing lamp has left and a spare
would be good for my peace of mind.
Many thanks.
Mike _______________________________________________
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