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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